Hydraulic fluid power — Fatigue pressure testing of metal pressure-containing envelopes — Part 1: Test method

ISO 10771 specifies a method of fatigue testing the pressure-containing envelopes of components used in hydraulic fluid power systems under sustained steady cyclic internal pressure loads. ISO 10771 is only applicable to component pressure-containing envelopes that are manufactured from metals, are operated at temperatures that exclude creep and low-temperature embrittlement, are only subjected to pressure-induced stresses, are not subjected to loss of strength due to corrosion or other chemical action and may include gaskets, seals and other non-metallic components; however, these are not considered part of the pressure-containing envelope being tested.

Transmissions hydrauliques — Essais de fatigue des enveloppes métalliques sous pression — Partie 1: Méthode d'essai

L'ISO 10771-1 spécifie une méthode d'essai de fatigue des enveloppes sous pression de composants utilisés dans les systèmes de transmissions hydrauliques sous des charges régulières cycliques de pression interne. L'ISO 10771-1 est applicable uniquement aux enveloppes sous pression qui sont fabriquées en métal, qui fonctionnent à des températures qui excluent le fluage et la fragilisation à basse température, qui sont soumises uniquement à contraintes induites par la pression, qui ne sont pas sujettes à des baisses de résistance dues à la corrosion ou à une autre action chimique, et qui peuvent inclure les garnitures, les joints et autres composants non métalliques; cependant, ceux-ci ne sont pas considérés comme faisant partie de l'enveloppe sous pression soumise à essai.

Fluidna tehnika - Hidravlika - Preskušanje utrujenosti kovinskih plaščev pod tlakom - 1. del: Preskusna metoda

General Information

Status
Withdrawn
Publication Date
17-Jul-2002
Withdrawal Date
17-Jul-2002
Current Stage
9599 - Withdrawal of International Standard
Start Date
21-Jul-2015
Completion Date
21-Jul-2015

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INTERNATIONAL ISO
STANDARD 10771-1
First edition
2002-08-01
Hydraulic fluid power — Fatigue pressure
testing of metal pressure-containing
envelopes —
Part 1:
Test method
Transmissions hydrauliques — Essais de fatigue des enveloppes
métalliques sous pression —
Partie 1: Méthode d'essai
Reference number
ISO 10771-1:2002(E)
ISO 2002
---------------------- Page: 1 ----------------------
ISO 10771-1:2002(E)
PDF disclaimer

This PDF file may contain embedded typefaces. In accordance with Adobe's licensing policy, this file may be printed or viewed but shall not

be edited unless the typefaces which are embedded are licensed to and installed on the computer performing the editing. In downloading this

file, parties accept therein the responsibility of not infringing Adobe's licensing policy. The ISO Central Secretariat accepts no liability in this

area.
Adobe is a trademark of Adobe Systems Incorporated.

Details of the software products used to create this PDF file can be found in the General Info relative to the file; the PDF-creation parameters

were optimized for printing. Every care has been taken to ensure that the file is suitable for use by ISO member bodies. In the unlikely event

that a problem relating to it is found, please inform the Central Secretariat at the address given below.

© ISO 2002

All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, electronic

or mechanical, including photocopying and microfilm, without permission in writing from either ISO at the address below or ISO's member body

in the country of the requester.
ISO copyright office
Case postale 56 • CH-1211 Geneva 20
Tel. + 41 22 749 01 11
Fax + 41 22 749 09 47
E-mail copyright@iso.ch
Web www.iso.ch
Printed in Switzerland
ii © ISO 2002 – All rights reserved
---------------------- Page: 2 ----------------------
ISO 10771-1:2002(E)
Contents Page

Foreword.....................................................................................................................................................................iv

Introduction.................................................................................................................................................................v

1 Scope ..............................................................................................................................................................1

2 Normative references....................................................................................................................................1

3 Terms and definitions ...................................................................................................................................2

4 Test conditions ..............................................................................................................................................2

5 Test equipment and preparation..................................................................................................................2

6 Accuracy.........................................................................................................................................................3

7 Test procedure...............................................................................................................................................3

8 Failure criteria ................................................................................................................................................5

9 Test report ......................................................................................................................................................5

10 Test declaration .............................................................................................................................................6

11 Identification statement (reference to this part of ISO 10771) .....................................................................6

Annex A (normative) Specific requirements for pumps and motors.....................................................................7

Annex B (normative) Specific requirements for hydraulic cylinders ....................................................................8

Annex C (normative) Specific requirements for gas-loaded accumulators........................................................11

Annex D (normative) Specific requirements for valves ........................................................................................13

Bibliography..............................................................................................................................................................14

© ISO 2002 – All rights reserved iii
---------------------- Page: 3 ----------------------
ISO 10771-1:2002(E)
Foreword

ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO

member bodies). The work of preparing International Standards is normally carried out through ISO technical

committees. Each member body interested in a subject for which a technical committee has been established has

the right to be represented on that committee. International organizations, governmental and non-governmental, in

liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical

Commission (IEC) on all matters of electrotechnical standardization.

International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 3.

The main task of technical committees is to prepare International Standards. Draft International Standards adopted

by the technical committees are circulated to the member bodies for voting. Publication as an International

Standard requires approval by at least 75 % of the member bodies casting a vote.

Attention is drawn to the possibility that some of the elements of this part of ISO 10771 may be the subject of

patent rights. ISO shall not be held responsible for identifying any or all such patent rights.

ISO 10771-1 was prepared by Technical Committee ISO/TC 131, Fluid power systems, Subcommittee SC 8,

Product testing.

ISO 10771 consists of the following parts, under the general title Hydraulic fluid power — Fatigue pressure testing

of metal pressure-containing envelopes:
 Part 1: Test method
 Part 2: Test rating (in preparation)
Annexes A to D form a normative part of this part of ISO 10771.
iv © ISO 2002 – All rights reserved
---------------------- Page: 4 ----------------------
ISO 10771-1:2002(E)
Introduction

In hydraulic fluid power systems, power is transmitted and controlled under pressure within an enclosed circuit. It is

important for the manufacturer and user of hydraulic components to have information on their global reliability

because of the importance of the fatigue failure mode and the relationship this has with the functional safety and

service life of such components. This part of ISO 10771 provides a method for fatigue testing the pressure-

containing envelope provided by hydraulic components.

During operation, components in a system may be subjected to loads that arise from:

 internal pressure;
 external forces;
 inertia and gravitational effects;
 impact or shock;
 temperature changes or gradients.

The nature of these loads can vary from a single static application to continuously varying amplitudes, repetitive

loadings and even shocks. It is important to know how a component can withstand these loads, but this part of

ISO 10771 addresses only the loading due to internal pressure.

There are many ways in which internal pressure loads are imposed upon a component. This part of ISO 10771

considers a broad range of waveforms within prescribed time limits, temperatures and environmental conditions,

and only upon metals. It is expected that these limitations could still provide sufficient common ground for a method

of fatigue pressure testing metal pressure-containing envelopes in hydraulic fluid power components. This method,

therefore, provides the system designer with certain information to assist in a selection of components for an

application. The system designer still has the responsibility of considering the other loading characteristics

described above and determining how they could affect the component's pressure-retaining capability.

© ISO 2002 – All rights reserved v
---------------------- Page: 5 ----------------------
INTERNATIONAL STANDARD ISO 10771-1:2002(E)
Hydraulic fluid power — Fatigue pressure testing of metal
pressure-containing envelopes —
Part 1:
Test method
1 Scope

This part of ISO 10771 specifies a method of fatigue testing the pressure-containing envelopes of components

used in hydraulic fluid power systems under sustained steady cyclic internal pressure loads.

This part of ISO 10771 is only applicable to component pressure-containing envelopes that:

 are manufactured from metals;

 are operated at temperatures that exclude creep and low-temperature embrittlement;

 are only subjected to pressure-induced stresses;

 are not subjected to loss of strength due to corrosion or other chemical action;

 may include gaskets, seals and other non-metallic components; however, these are not considered part of the

pressure-containing envelope being tested, (see note 3 in 5.5).

This part of ISO 10771 does not apply to piping as defined in ISO 4413 (i.e. connectors, hose, tubing, pipe). See

ISO 8434-5, ISO 6803 and ISO 6605 for methods of fatigue testing of piping devices.

This part of ISO 10771 establishes a general test method that is applicable for many hydraulic fluid power

components, but additional requirements or more specific methods that may be required for particular components

are contained in the annexes or other standards.
2 Normative references

The following normative documents contain provisions which, through reference in this text, constitutes provisions

of this part of ISO 10771. For dated reference, subsequent amendments to, or revisions of, any of these

publications do not apply. However, parties to agreements based on this part of ISO 10771 are encouraged to

investigate the possibility of applying the most recent editions of the normative documents indicated below. For an

undated reference, the latest edition of the normative document referred to applies. Members of ISO and IEC

maintain registers of currently valid International Standards.
ISO 4413:1998, Hydraulic fluid power — General rules relating to systems
ISO 5598:1985, Fluid power systems and components — Vocabulary

ISO 9110-1:1990, Hydraulic fluid power — Measurement techniques — Part 1: General measurement principles

ISO 9110-2:1990, Hydraulic fluid power — Measurement techniques — Part 2: Measurement of average steady-state

pressure in a closed conduit
© ISO 2002 – All rights reserved 1
---------------------- Page: 6 ----------------------
ISO 10771-1:2002(E)
3 Terms and definitions

For the purposes of this part of ISO 17701, the terms and definitions given in ISO 5598 and the following apply.

3.1
upper cyclic test pressure
minimum value of the highest level of the specified test pressure cycle
3.2
lower cyclic test pressure
maximum value of the lowest level of the specified test pressure cycle
3.3
cyclic test pressure range

difference between the upper and lower cyclic test pressures during a fatigue test

3.4
pressure-containing envelope

elements of a component that contain the pressurized hydraulic fluid, and the means to secure the elements (bolts,

welds, etc.)

NOTE 1 Gaskets and seals are not considered as part of the pressure-containing envelope.

NOTE 2 See annexes for component definitions.
4 Test conditions

4.1 Remove entrapped air from the test component and circuit before starting each test.

4.2 The temperature of the hydraulic fluid in the component shall be in the range 15 °C to 80 °C. The

temperature of the component shall be a minimum of 15 °C.
5 Test equipment and preparation

5.1 The test equipment and circuit shall be able to generate and repeat the pressure cycle as specified in 7.1.

5.2 Pressure transducer(s) shall be mounted directly into the test component, or as near as possible, so as to

record the internal conditions applied to the component. Any restrictions between the transducers and the

pressure-containing envelope being tested should be avoided.

5.3 Any non-corrosive hydraulic fluid that has a kinematic viscosity not greater than 60 mm /s at the test

temperature shall be used as the pressurizing medium.

5.4 Different pressures shall be applied to separate portions of the test components as dictated by design

specifications.

5.5 It shall be verified that the ratio of induced stress to pressure, under static loading conditions, is also attained

at the test cycling rate, especially when:
 pressures have to penetrate between close-fitting parts;
 large components are tested;
2 © ISO 2002 – All rights reserved
---------------------- Page: 7 ----------------------
ISO 10771-1:2002(E)
 hysteresis in joints can significantly affect stresses.

NOTE 1 Strain gauges may be used to verify this ratio and, if used, should be located externally in an area of high strain.

NOTE 2 It is permissible to make modifications to the test samples to facilitate cyclic or burst tests, providing such

modifications do not increase the pressure capabilities of the pressure-containing envelope.

NOTE 3 It is permissible to replace gaskets and seals that fail during the test, as long as preloads in stressed elements are

the same after reassembly as they were before disassembly. It is possible that fastener preloads may decrease during fatigue

testing. Fastener preloads should be set to this reduced level when seals or gaskets are replaced.

5.6 Safety procedures shall be followed in order to protect personnel and test equipment during the test

(see ISO 4413).
6 Accuracy
6.1 Instrumentation shall be accurate to within the following limits:
 pressure: ± 1,0 % of the upper cyclic test pressure;
 strain: ± 1 % of the value obtained at the upper cyclic test pressure;
 time: ± 0,002 s resolution;
 temperature: ± 2 °C.

6.2 Use pressure transducers, amplifiers and recording devices with a combined system frequency response

such that in the frequency range 0 kHz to 2 kHz, the amplitude ratio is within 0 dB and −3 dB.

...

SLOVENSKI STANDARD
SIST ISO 10771-1:2003
01-julij-2003
)OXLGQDWHKQLND+LGUDYOLND3UHVNXãDQMHXWUXMHQRVWLNRYLQVNLKSODãþHYSRG
WODNRPGHO3UHVNXVQDPHWRGD

Hydraulic fluid power -- Fatigue pressure testing of metal pressure-containing envelopes

-- Part 1: Test method
Transmissions hydrauliques -- Essais de fatigue des enveloppes métalliques sous
pression -- Partie 1: Méthode d'essai
Ta slovenski standard je istoveten z: ISO 10771-1:2002
ICS:
23.100.99 'UXJLVHVWDYQLGHOL Other fluid power system
KLGUDYOLþQLKVLVWHPRY components
SIST ISO 10771-1:2003 en

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

---------------------- Page: 1 ----------------------
SIST ISO 10771-1:2003
---------------------- Page: 2 ----------------------
SIST ISO 10771-1:2003
INTERNATIONAL ISO
STANDARD 10771-1
First edition
2002-08-01
Hydraulic fluid power — Fatigue pressure
testing of metal pressure-containing
envelopes —
Part 1:
Test method
Transmissions hydrauliques — Essais de fatigue des enveloppes
métalliques sous pression —
Partie 1: Méthode d'essai
Reference number
ISO 10771-1:2002(E)
ISO 2002
---------------------- Page: 3 ----------------------
SIST ISO 10771-1:2003
ISO 10771-1:2002(E)
PDF disclaimer

This PDF file may contain embedded typefaces. In accordance with Adobe's licensing policy, this file may be printed or viewed but shall not

be edited unless the typefaces which are embedded are licensed to and installed on the computer performing the editing. In downloading this

file, parties accept therein the responsibility of not infringing Adobe's licensing policy. The ISO Central Secretariat accepts no liability in this

area.
Adobe is a trademark of Adobe Systems Incorporated.

Details of the software products used to create this PDF file can be found in the General Info relative to the file; the PDF-creation parameters

were optimized for printing. Every care has been taken to ensure that the file is suitable for use by ISO member bodies. In the unlikely event

that a problem relating to it is found, please inform the Central Secretariat at the address given below.

© ISO 2002

All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, electronic

or mechanical, including photocopying and microfilm, without permission in writing from either ISO at the address below or ISO's member body

in the country of the requester.
ISO copyright office
Case postale 56 • CH-1211 Geneva 20
Tel. + 41 22 749 01 11
Fax + 41 22 749 09 47
E-mail copyright@iso.ch
Web www.iso.ch
Printed in Switzerland
ii © ISO 2002 – All rights reserved
---------------------- Page: 4 ----------------------
SIST ISO 10771-1:2003
ISO 10771-1:2002(E)
Contents Page

Foreword.....................................................................................................................................................................iv

Introduction.................................................................................................................................................................v

1 Scope ..............................................................................................................................................................1

2 Normative references....................................................................................................................................1

3 Terms and definitions ...................................................................................................................................2

4 Test conditions ..............................................................................................................................................2

5 Test equipment and preparation..................................................................................................................2

6 Accuracy.........................................................................................................................................................3

7 Test procedure...............................................................................................................................................3

8 Failure criteria ................................................................................................................................................5

9 Test report ......................................................................................................................................................5

10 Test declaration .............................................................................................................................................6

11 Identification statement (reference to this part of ISO 10771) .....................................................................6

Annex A (normative) Specific requirements for pumps and motors.....................................................................7

Annex B (normative) Specific requirements for hydraulic cylinders ....................................................................8

Annex C (normative) Specific requirements for gas-loaded accumulators........................................................11

Annex D (normative) Specific requirements for valves ........................................................................................13

Bibliography..............................................................................................................................................................14

© ISO 2002 – All rights reserved iii
---------------------- Page: 5 ----------------------
SIST ISO 10771-1:2003
ISO 10771-1:2002(E)
Foreword

ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO

member bodies). The work of preparing International Standards is normally carried out through ISO technical

committees. Each member body interested in a subject for which a technical committee has been established has

the right to be represented on that committee. International organizations, governmental and non-governmental, in

liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical

Commission (IEC) on all matters of electrotechnical standardization.

International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 3.

The main task of technical committees is to prepare International Standards. Draft International Standards adopted

by the technical committees are circulated to the member bodies for voting. Publication as an International

Standard requires approval by at least 75 % of the member bodies casting a vote.

Attention is drawn to the possibility that some of the elements of this part of ISO 10771 may be the subject of

patent rights. ISO shall not be held responsible for identifying any or all such patent rights.

ISO 10771-1 was prepared by Technical Committee ISO/TC 131, Fluid power systems, Subcommittee SC 8,

Product testing.

ISO 10771 consists of the following parts, under the general title Hydraulic fluid power — Fatigue pressure testing

of metal pressure-containing envelopes:
 Part 1: Test method
 Part 2: Test rating (in preparation)
Annexes A to D form a normative part of this part of ISO 10771.
iv © ISO 2002 – All rights reserved
---------------------- Page: 6 ----------------------
SIST ISO 10771-1:2003
ISO 10771-1:2002(E)
Introduction

In hydraulic fluid power systems, power is transmitted and controlled under pressure within an enclosed circuit. It is

important for the manufacturer and user of hydraulic components to have information on their global reliability

because of the importance of the fatigue failure mode and the relationship this has with the functional safety and

service life of such components. This part of ISO 10771 provides a method for fatigue testing the pressure-

containing envelope provided by hydraulic components.

During operation, components in a system may be subjected to loads that arise from:

 internal pressure;
 external forces;
 inertia and gravitational effects;
 impact or shock;
 temperature changes or gradients.

The nature of these loads can vary from a single static application to continuously varying amplitudes, repetitive

loadings and even shocks. It is important to know how a component can withstand these loads, but this part of

ISO 10771 addresses only the loading due to internal pressure.

There are many ways in which internal pressure loads are imposed upon a component. This part of ISO 10771

considers a broad range of waveforms within prescribed time limits, temperatures and environmental conditions,

and only upon metals. It is expected that these limitations could still provide sufficient common ground for a method

of fatigue pressure testing metal pressure-containing envelopes in hydraulic fluid power components. This method,

therefore, provides the system designer with certain information to assist in a selection of components for an

application. The system designer still has the responsibility of considering the other loading characteristics

described above and determining how they could affect the component's pressure-retaining capability.

© ISO 2002 – All rights reserved v
---------------------- Page: 7 ----------------------
SIST ISO 10771-1:2003
---------------------- Page: 8 ----------------------
SIST ISO 10771-1:2003
INTERNATIONAL STANDARD ISO 10771-1:2002(E)
Hydraulic fluid power — Fatigue pressure testing of metal
pressure-containing envelopes —
Part 1:
Test method
1 Scope

This part of ISO 10771 specifies a method of fatigue testing the pressure-containing envelopes of components

used in hydraulic fluid power systems under sustained steady cyclic internal pressure loads.

This part of ISO 10771 is only applicable to component pressure-containing envelopes that:

 are manufactured from metals;

 are operated at temperatures that exclude creep and low-temperature embrittlement;

 are only subjected to pressure-induced stresses;

 are not subjected to loss of strength due to corrosion or other chemical action;

 may include gaskets, seals and other non-metallic components; however, these are not considered part of the

pressure-containing envelope being tested, (see note 3 in 5.5).

This part of ISO 10771 does not apply to piping as defined in ISO 4413 (i.e. connectors, hose, tubing, pipe). See

ISO 8434-5, ISO 6803 and ISO 6605 for methods of fatigue testing of piping devices.

This part of ISO 10771 establishes a general test method that is applicable for many hydraulic fluid power

components, but additional requirements or more specific methods that may be required for particular components

are contained in the annexes or other standards.
2 Normative references

The following normative documents contain provisions which, through reference in this text, constitutes provisions

of this part of ISO 10771. For dated reference, subsequent amendments to, or revisions of, any of these

publications do not apply. However, parties to agreements based on this part of ISO 10771 are encouraged to

investigate the possibility of applying the most recent editions of the normative documents indicated below. For an

undated reference, the latest edition of the normative document referred to applies. Members of ISO and IEC

maintain registers of currently valid International Standards.
ISO 4413:1998, Hydraulic fluid power — General rules relating to systems
ISO 5598:1985, Fluid power systems and components — Vocabulary

ISO 9110-1:1990, Hydraulic fluid power — Measurement techniques — Part 1: General measurement principles

ISO 9110-2:1990, Hydraulic fluid power — Measurement techniques — Part 2: Measurement of average steady-state

pressure in a closed conduit
© ISO 2002 – All rights reserved 1
---------------------- Page: 9 ----------------------
SIST ISO 10771-1:2003
ISO 10771-1:2002(E)
3 Terms and definitions

For the purposes of this part of ISO 17701, the terms and definitions given in ISO 5598 and the following apply.

3.1
upper cyclic test pressure
minimum value of the highest level of the specified test pressure cycle
3.2
lower cyclic test pressure
maximum value of the lowest level of the specified test pressure cycle
3.3
cyclic test pressure range

difference between the upper and lower cyclic test pressures during a fatigue test

3.4
pressure-containing envelope

elements of a component that contain the pressurized hydraulic fluid, and the means to secure the elements (bolts,

welds, etc.)

NOTE 1 Gaskets and seals are not considered as part of the pressure-containing envelope.

NOTE 2 See annexes for component definitions.
4 Test conditions

4.1 Remove entrapped air from the test component and circuit before starting each test.

4.2 The temperature of the hydraulic fluid in the component shall be in the range 15 °C to 80 °C. The

temperature of the component shall be a minimum of 15 °C.
5 Test equipment and preparation

5.1 The test equipment and circuit shall be able to generate and repeat the pressure cycle as specified in 7.1.

5.2 Pressure transducer(s) shall be mounted directly into the test component, or as near as possible, so as to

record the internal conditions applied to the component. Any restrictions between the transducers and the

pressure-containing envelope being tested should be avoided.

5.3 Any non-corrosive hydraulic fluid that has a kinematic viscosity not greater than 60 mm /s at the test

temperature shall be used as the pressurizing medium.

5.4 Different pressures shall be applied to separate portions of the test components as dictated by design

specifications.

5.5 It shall be verified that the ratio of induced stress to pressure, under static loading conditions, is also attained

at the test cycling rate, especially when:
 pressures have to penetrate between close-fitting parts;
 large components are tested;
2 © ISO 2002 – All rights reserved
---------------------- Page: 10 ----------------------
SIST ISO 10771-1:2003
ISO 10771-1:2002(E)
 hysteresis in joints can significantly affect stresses.

NOTE 1 Strain gauges may be used to verify this ratio and, if used, should be located externally in an area of high strain.

NOTE 2 It is permissible to make modifications to the test samples to facilitate cyclic or burst tests, providing such

modifications do not increase the pressure capabilities of the pressure-containing envelope.

NOTE 3 It is permissible to replace gaskets and seals that fail during the test, as long as preloads in stressed elements are

the same after reassembly as they were before disassembly. It is possible that fastener preloads may decrease during fatigue

testing. Fastener preloads should be set to this reduced level when seals or gaskets are replaced.

5.6 Safety procedures shall be followed in order to protect personnel and test equipment during th

...

NORME ISO
INTERNATIONALE 10771-1
Première édition
2002-08-01
Transmissions hydrauliques — Essais de
fatigue des enveloppes métalliques sous
pression —
Partie 1:
Méthode d’essai
Hydraulic fluid power — Fatigue pressure testing of metal pressure-
containing envelopes —
Part 1: Test method
Numéro de référence
ISO 10771-1:2002(F)
ISO 2002
---------------------- Page: 1 ----------------------
ISO 10771-1:2002(F)
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Droits de reproduction réservés. Sauf prescription différente, aucune partie de cette publication ne peut être reproduite ni utilisée sous quelque

forme que ce soit et par aucun procédé, électronique ou mécanique, y compris la photocopie et les microfilms, sans l'accord écrit de l’ISO à

l’adresse ci-après ou du comité membre de l’ISO dans le pays du demandeur.
ISO copyright office
Case postale 56 • CH-1211 Geneva 20
Tel. + 41 22 749 01 11
Fax. + 41 22 749 09 47
E-mail copyright@iso.ch
Web www.iso.ch
Imprimé en Suisse
ii © ISO 2002 – Tous droits réservés
---------------------- Page: 2 ----------------------
ISO 10771-1:2002(F)
Sommaire Page

Avant-propos .............................................................................................................................................................iv

Introduction.................................................................................................................................................................v

1 Domaine d'application ..................................................................................................................................1

2 Références normatives .................................................................................................................................1

3 Termes et définitions.....................................................................................................................................2

4 Conditions d'essai.........................................................................................................................................2

5 Équipement d'essai et préparation..............................................................................................................2

6 Exactitude.......................................................................................................................................................3

7 Mode opératoire d'essai................................................................................................................................3

8 Critères de défaillance ..................................................................................................................................5

9 Rapport d'essai..............................................................................................................................................5

10 Déclaration .....................................................................................................................................................6

11 Phrase d'identification (Référence à la présente partie de l’ISO 10771) .....................................................6

Annexe A (normative) Exigences spécifiques pour les pompes et moteurs........................................................7

Annexe B (normative) Exigences spécifiques pour les vérins hydrauliques.......................................................8

Annexe C (normative) Exigences spécifiques pour les accumulateurs .............................................................11

Annexe D (normative) Exigences spécifiques pour les appareils de distribution et de régulation.................13

Bibliographie.............................................................................................................................................................14

© ISO 2002 – Tous droits réservés iii
---------------------- Page: 3 ----------------------
ISO 10771-1:2002(F)
Avant-propos

L'ISO (Organisation internationale de normalisation) est une fédération mondiale d'organismes nationaux de

normalisation (comités membres de l'ISO). L'élaboration des Normes internationales est en général confiée aux

comités techniques de l'ISO. Chaque comité membre intéressé par une étude a le droit de faire partie du comité

technique créé à cet effet. Les organisations internationales, gouvernementales et non gouvernementales, en

liaison avec l'ISO participent également aux travaux. L'ISO collabore étroitement avec la Commission

électrotechnique internationale (CEI) en ce qui concerne la normalisation électrotechnique.

Les Normes internationales sont rédigées conformément aux règles données dans les Directives ISO/CEI,

Partie 3.

La tâche principale des comités techniques est d'élaborer les Normes internationales. Les projets de Normes

internationales adoptés par les comités techniques sont soumis aux comités membres pour vote. Leur publication

comme Normes internationales requiert l'approbation de 75 % au moins des comités membres votants.

L'attention est appelée sur le fait que certains des éléments de la présente partie de l'ISO 10771 peuvent faire

l'objet de droits de propriété intellectuelle ou de droits analogues. L'ISO ne saurait être tenue pour responsable de

ne pas avoir identifié de tels droits de propriété et averti de leur existence.

L'ISO 10771-1 a été élaborée par le comité technique ISO/TC 131, Transmissions hydrauliques et pneumatiques,

sous-comité SC 8, Essais des produits.

L'ISO 10771 comprend les parties suivantes, présentées sous le titre général Transmissions hydrauliques —

Essais de fatigue des enveloppes métalliques sous pression:
 Partie 1: Méthode d'essai
 Partie 2: Évaluation des essais (en préparation)

Les annexes A, B, C et D constituent des éléments normatifs de la présente partie de l’ISO 10771.

iv © ISO 2002 – Tous droits réservés
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ISO 10771-1:2002(F)
Introduction

Dans les systèmes de transmissions hydrauliques, l’énergie est transmise et commandée par l’intermédiaire d’un

fluide sous pression circulant en circuit fermé. Il est important pour le fabricant et l’utilisateur de composants

hydrauliques d’avoir des informations sur leur sûreté totale en raison de l’importance du mode de défaillance par

fatigue et de sa relation avec la sûreté fonctionnelle et la durée de fonctionnement de tels composants. La

présente partie de l’ISO 10771 fournit une méthode d’essai de fatigue des enveloppes sous pression de

composants hydrauliques.

En fonctionnement, les composants d’un système peuvent être soumis à des charges dues

 à la pression interne;
 aux forces externes;
 aux effets de l’inertie et de la gravité;
 aux impacts ou chocs;
 aux variations thermiques.

La nature de ces charges peut varier d’une simple application statique à des applications continues d’amplitudes

variables, des charges répétitives et mêmes des chocs. Il est important de connaître comment un composant peut

résister à ces charges, mais la présente partie de l’ISO 10771 ne concerne que les charges dues à la pression

interne.

Il y a beaucoup de façons dont les charges de pression interne peuvent s’appliquer à un composant. La présente

partie de l’ISO 10771 considère une large plage de formes d’onde mais dans des limites de temps, de

températures et de conditions environnementales, et uniquement les métaux. On suppose que ces limitations

puissent fournir une base commune suffisante pour une méthode d’essai de fatigue en pression des enveloppes

métalliques sous pression de composants de transmissions hydrauliques. Cette méthode fournit donc au

concepteur du système certaines informations pour l’assister dans la sélection de composants pour une

application. Le concepteur du système a toujours la responsabilité de prendre en compte les autres types de

charge décrits ci-dessus et de déterminer comment elles peuvent affecter la capacité du composant à retenir la

pression.
© ISO 2002 – Tous droits réservés v
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NORME INTERNATIONALE ISO 10771-1:2002(F)
Transmissions hydrauliques — Essais de fatigue des enveloppes
métalliques sous pression —
Partie 1:
Méthode d'essai
1 Domaine d'application

La présente partie de l’ISO 10771 spécifie une méthode d’essai de fatigue des enveloppes sous pression de

composants utilisés dans les systèmes de transmissions hydrauliques sous des charges régulières cycliques de

pression interne.

La présente partie de l’ISO 10771 est applicable uniquement aux enveloppes sous pression qui

 sont fabriquées en métal;

 fonctionnent à des températures qui excluent le fluage et la fragilisation à basse température;

 sont soumises uniquement à contraintes induites par la pression;

 ne sont pas sujettes à des baisses de résistance dues à la corrosion ou à une autre action chimique;

 peuvent inclure les garnitures, les joints et autres composants non métalliques; cependant, ceux-ci ne sont

pas considérés comme faisant partie de l’enveloppe sous pression soumise à essai (voir la note 3 de 5.5).

La présente partie de l’ISO 10771 ne s’applique pas aux tuyauteries, tuyautages comme définis dans l’ISO 4413

(c’est-à-dire, raccordements, flexible, tubes, tuyauteries rigides). Se référer à l’ISO 8434-5, à l’ISO 6803 et à

l’ISO 6605 pour les méthodes d’essai de fatigue des dispositifs de tuyauteries.

La présente partie de l’ISO 10771 établit une méthode générale d’essai qui est applicable pour beaucoup de

composants de transmission hydrauliques, mais des exigences supplémentaires ou des méthodes plus spécifiques

requises pour des composants particuliers sont contenues dans les annexes A à D ou dans d’autres normes.

2 Références normatives

Les documents normatifs suivants contiennent des dispositions qui, par suite de la référence qui y est faite,

constituent des dispositions valables pour la présente partie de l'ISO 10771. Pour les références datées, les

amendements ultérieurs ou les révisions de ces publications ne s’appliquent pas. Toutefois, les parties prenantes

aux accords fondés sur la présente partie de l'ISO 10771 sont invitées à rechercher la possibilité d'appliquer les

éditions les plus récentes des documents normatifs indiqués ci-après. Pour les références non datées, la dernière

édition du document normatif en référence s’applique. Les membres de l'ISO et de la CEI possèdent le registre des

Normes internationales en vigueur.

ISO 4413:1998, Transmissions hydrauliques — Règles générales relatives aux systèmes

ISO 5598:1985, Transmissions hydrauliques et pneumatiques — Vocabulaire

ISO 9110-1:1990, Transmissions hydrauliques — Techniques de mesurage — Partie 1: Principes généraux de

mesurage

ISO 9110-2:1990, Transmissions hydrauliques — Techniques de mesurage — Partie 2: Mesurage de la pression

moyenne dans un conduit fermé en régime permanent
© ISO 2002 – Tous droits réservés 1
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ISO 10771-1:2002(F)
3 Termes et définitions

Pour les besoins de la présente partie de l'ISO 10771, les termes et définitions donnés dans l’ISO 5598 ainsi que

les suivants s'appliquent.
3.1
pression supérieure cyclique d’essai
valeur minimale du plus haut niveau du cycle de pressions d’essai spécifié
3.2
pression inférieure cyclique d’essai
valeur maximale du plus bas niveau du cycle de pressions d’essai spécifié
3.3
pression d’essai cyclique

différence entre les pressions d’essai cycliques supérieure et inférieure durant un essai de fatigue

3.4
enveloppe sous pression

élément d’un composant contenant un fluide hydraulique sous pression, et les moyens de fixation de ces éléments

(vis, soudures, etc.)

NOTE 1 Les garnitures et les joints ne sont pas considérés comme faisant partie de l’enveloppe sous pression.

NOTE 2 Voir les annexes pour les définitions des composants.
4 Conditions d'essai

4.1 Éliminer l’air prisonnier dans les composants et le circuit d’essai avant de commencer l’essai.

4.2 La température du fluide hydraulique dans le composant doit être dans la plage 15 °C à 80 °C. La

température du composant doit être au minimum de 15 °C.
5 Équipement d'essai et préparation

5.1 L’équipement et le circuit d’essai doivent être capables de générer et de répéter le cycle de pressions

comme spécifié en 7.1.

5.2 Le(s) capteur(s) de pression doi(ven)t être monté(s) directement dans le composant soumis à essai, ou

aussi près de lui que possible, de façon à enregistrer les conditions internes appliquées aux composants. Il

convient d’éviter toutes restrictions entre les capteurs et l’enveloppe sous pression soumise à essai.

5.3 Tout fluide hydraulique non corrosif ayant une viscosité cinématique inférieure à 60 mm /s à la température

d’essai doit être utilisé comme médium sous pression.

5.4 Différentes pressions doivent être appliquées à des portions séparées des composants d’essai comme

imposé par les spécifications de conception.

5.5 Il doit être vérifié que le rapport de contrainte induite à pression, avec des conditions de charge statique, est

également atteint au cycle d’essai, spécialement lorsque
 les pressions peuvent pénétrer entre les parties ajustées;
2 © ISO 2002 – Tous droits réservés
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ISO 10771-1:2002(F)
 de grands composants sont soumis à essai;

 l’hystérésis dans les joints peut affecter de façon significative les contraintes.

NOTE 1 Des extensomètres peuvent être utilisés pour vérifier ce rapport et, si nécessaire, il convient de les placer à

l’extérieur dans des zones de contraintes élevées.

NOTE 2 Il est permis de modifier les échantillons d’essai afin de faciliter les essais cycliques ou d’éclatement, pourvu que

ces modifications n’augmentent pas les capacités en pression de l’enveloppe sous pression.

NOTE 3 Il est permis de remplacer les garnitures et les joints défaillants durant l’essai, de façon que les précontraintes des

éléments sollicités soient les mêmes après remontage qu’avant. Il est possible que les précontraintes de montage diminuent

durant l’essai de fatigue. Il convient que les précontraintes de montage soit ajustées à ce niveau réduit lorsque des joints ou des

garnitures sont remplacés.

5.6 Des procédures de sécurité doivent être suivies afin de protéger le personnel et l’équipement d’essai

pendant l’essai (voir l’ISO 4413).
6 Exactitude

6.1 L’instrumentation doit avoir une exactitude se situant dans les limites suivantes:

 pression: ± 1,0 % de la pression supérieure cyclique d’essai;

 contrainte: ± 1 % de la valeur obtenue à la pression supérieure cyclique d’essai;

 temps: graduation de ± 0,002 s;
 température: ± 2 °C.

6.2 Utiliser des capteurs de pression, des amplificateurs et des appareils d’enregistrement avec une réponse en

fréquence combinée du système telle que, dans la plage de fréquences 0 kHz à 2 kHz, le rapport d'amplitude soit

compris entre 0 dB et − 3 dB.
6.3 Les instruments doivent être conformes à l’ISO 9110-1 et à l’ISO 9110-2.
7 Mode opératoire d'essai
7.1 Pression cyclique d’essai
...

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