SIST EN ISO 7500-2:2007

Metallic materials - Verification of static uniaxial testing machines - Part 2: Tension creep testing machines - Verification of the applied force (ISO 7500-2:2006)

This part of ISO 7500 specifies the verification of testing machines used for uniaxial creep testing in tension in accordance with ISO 204. The verification consists of a general inspection of the testing machine, and a verification of the force applied by the testing machine. This part of ISO 7500 applies to dead-weight machines, lever-type creep testing machines and direct-springloading machines. Machines with a force-measuring system1 ) should be verified in accordance with ISO 7500-1, Metallic materials -Verification of static uniaxial testing machines - Part 1: Tension/compression testing machines - Verification and calibration of the force-measuring system.

Metallische Werkstoffe - Prüfung von statischen einachsigen Prüfmaschinen - Teil 2: Zeitstandprüfmaschinen für Zugbeanspruchung - Prüfung der angewendeten Kraft (ISO 7500-2:2006)

Dieser Teil von ISO 7500 gilt für die Prüfung von Prüfmaschinen, die für Zeitstand-Zugversuche mit einachsiger Beanspruchung nach ISO 204 verwendet werden.
Die Prüfung besteht aus
   einer allgemeinen Inspektion der Prüfmaschine und
   einer Prüfung der durch die Prüfmaschine erzeugten Kraft.
Dieser Teil von ISO 7500 gilt für die Zeitstandprüfmaschinen mit direkter Gewichtsbelastung, für solche mit Hebelübersetzung und solche mit Federbelastungssystem.
Prüfmaschinen mit einem Kraftmesssystem ) sollten nach ISO 7500-1, Metallic materials Verification of static uniaxial testing machines Part 1: Tension/compression testing machines Verification and calibration of the force-measuring system, geprüft werden.

Matériaux métalliques - Vérification des machines pour essais statiques uniaxiaux - Partie 2: Machines d'essai de fluage en traction - Vérification de la force appliquée (ISO 7500-2:2006)

L'ISO 7500-2:2006 spécifie la vérification des machines d'essai utilisées pour l'essai de fluage uniaxial en traction conformément à l'ISO 204.
La vérification comporte:
une inspection générale de la machine d'essai, etune vérification de la force appliquée par la machine d'essai.
L'ISO 7500-2:2006 est applicable aux machines d'essai de fluage de type à poids morts, aux machines d'essai de fluage de type à bras de levier et aux machines à application directe de la force par un ressort.
Il convient que les machines ayant un système de mesure de force soient vérifiées conformément à l'ISO 7500-1.

Kovinski materiali – Preverjanje strojev za enoosno statično preskušanje – 2. del: Stroji za natezni preskus lezenja - Preverjanje in umerjanje obremenitev (ISO 7500-2:2006)

General Information

• Status: Published
• Publication Date: 31-Mar-2007
• ICS: 77.040.10 - Mechanical testing of metals
• Technical Committee: PKG - Testing of metallic materials
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 01-Apr-2007
• Due Date: 01-Apr-2007
• Completion Date: 01-Apr-2007
• Ref Project: EN ISO 7500-2:2006 - Metallic materials - Verification of static uniaxial testing machines - Part 2: Tension creep testing machines - Verification of the applied force (ISO 7500-2:2006)

Relations

• Replaces: SIST EN ISO 7500-2:2000 - Metallic materials - Verification of static uniaxial testing machines - Part 2: Tension creep testing machines - Verification of the applied load (ISO 7500-2:1996)
• Effective Date: 13-Apr-2007

Standards Content (Sample)

SLOVENSKI STANDARD
SIST EN ISO 7500-2:2007
01-april-2007
1DGRPHãþD
SIST EN ISO 7500-2:2000
.RYLQVNLPDWHULDOL±3UHYHUMDQMHVWURMHY]DHQRRVQRVWDWLþQRSUHVNXãDQMH±GHO
6WURML]DQDWH]QLSUHVNXVOH]HQMD3UHYHUMDQMHLQXPHUMDQMHREUHPHQLWHY,62

Metallic materials - Verification of static uniaxial testing machines - Part 2: Tension creep
testing machines - Verification of the applied force (ISO 7500-2:2006)
Metallische Werkstoffe - Prüfung von statischen einachsigen Prüfmaschinen - Teil 2:
Zeitstandprüfmaschinen für Zugbeanspruchung - Prüfung der angewendeten Kraft (ISO
7500-2:2006)
Matériaux métalliques - Vérification des machines pour essais statiques uniaxiaux -
Partie 2: Machines d'essai de fluage en traction - Vérification de la force appliquée (ISO
7500-2:2006)
Ta slovenski standard je istoveten z: EN ISO 7500-2:2006
ICS:
77.040.10 Mehansko preskušanje kovin Mechanical testing of metals
SIST EN ISO 7500-2:2007 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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EUROPEAN STANDARD
EN ISO 7500-2
NORME EUROPÉENNE
EUROPÄISCHE NORM
December 2006
ICS 77.040.10 Supersedes EN ISO 7500-2:1999
English Version
Metallic materials - Verification of static uniaxial testing
machines - Part 2: Tension creep testing machines - Verification
of the applied force (ISO 7500-2:2006)
Matériaux métalliques - Vérification des machines pour Metallische Werkstoffe - Prüfung von statischen
essais statiques uniaxiaux - Partie 2: Machines d'essai de einachsigen Prüfmaschinen - Teil 2:
fluage en traction - Vérification de la force appliquée (ISO Zeitstandprüfmaschinen für Zugbeanspruchung - Prüfung
7500-2:2006) und Kalibrierung des Kraftmesssystems (ISO 7500-2:2006)
This European Standard was approved by CEN on 4 September 2006.
CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European
Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national
standards may be obtained on application to the Central Secretariat or to any CEN member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by translation
under the responsibility of a CEN member into its own language and notified to the Central Secretariat has the same status as the official
versions.
CEN members are the national standards bodies of Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France,
Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania,
Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre: rue de Stassart, 36  B-1050 Brussels
© 2006 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 7500-2:2006: E
worldwide for CEN national Members.

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EN ISO 7500-2:2006 (E)





Foreword


This document (EN ISO 7500-2:2006) has been prepared by Technical Committee ISO/TC 164
"Mechanical testing of metals" in collaboration with Technical Committee ECISS/TC 1 "Steel -
Mechanical testing", the secretariat of which is held by AFNOR.

This European Standard shall be given the status of a national standard, either by publication of
an identical text or by endorsement, at the latest by June 2007, and conflicting national
standards shall be withdrawn at the latest by June 2007.

This document supersedes EN ISO 7500-2:1999.

According to the CEN/CENELEC Internal Regulations, the national standards organizations of
the following countries are bound to implement this European Standard: Austria, Belgium,
Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary,
Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland,
Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.


Endorsement notice

The text of ISO 7500-2:2006 has been approved by CEN as EN ISO 7500-2:2006 without any
modifications.

2

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INTERNATIONAL ISO
STANDARD 7500-2
Second edition
2006-12-15


Metallic materials — Verification of static
uniaxial testing machines —
Part 2:
Tension creep testing machines —
Verification of the applied force
Matériaux métalliques — Vérification des machines pour essais
statiques uniaxiaux —
Partie 2: Machines d'essai de fluage en traction — Vérification
de la force appliquée





Reference number
ISO 7500-2:2006(E)
©
ISO 2006

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ISO 7500-2:2006(E)
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ii © ISO 2006 – All rights reserved

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ISO 7500-2:2006(E)
Contents Page
Foreword. iv
1 Scope. 1
2 Normative references. 1
3 Symbols and their meanings. 2
4 General inspection of the testing machine . 2
5 Verification of the force applied by the testing machine. 3
5.1 General. 3
5.2 Masses. 3
5.3 Determination of the discrimination threshold. 3
5.4 Determination of the lower limit of verification . 4
5.5 Test procedure. 4
5.6 Assessment of the force applied by the machine . 6
6 Class of the testing machine . 6
6.1 General. 6
6.2 Lever-type creep testing machines. 6
6.3 Creep testing machines with the force applied by direct acting masses . 7
6.4 Creep testing machines with the force applied directly by a spring. 7
7 Verification report. 8
8 Intervals between verifications . 8
Annex A (normative) General inspection of the testing machine . 9


© ISO 2006 – All rights reserved iii

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ISO 7500-2:2006(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 2.
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 document may be the subject of patent
rights. ISO shall not be held responsible for identifying any or all such patent rights.
ISO 7500-2 was prepared by Technical Committee ISO/TC 164, Mechanical testing of metals, Subcommittee
SC 1, Uniaxial testing.
This second edition cancels and replaces the first edition (ISO 7500-2:1996), which has been technically
revised.
ISO 7500 consists of the following parts, under the general title Metallic materials — Verification of static
uniaxial testing machines:
⎯ Part 1: Tension/compression testing machines — Verification and calibration of the force-measuring
system
⎯ Part 2: Tension creep testing machines — Verification of the applied force

iv © ISO 2006 – All rights reserved

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INTERNATIONAL STANDARD ISO 7500-2:2006(E)

Metallic materials — Verification of static uniaxial testing
machines —
Part 2:
Tension creep testing machines — Verification of the applied
force
1 Scope
This part of ISO 7500 specifies the verification of testing machines used for uniaxial creep testing in tension in
accordance with ISO 204.
The verification consists of
⎯ a general inspection of the testing machine, and
⎯ a verification of the force applied by the testing machine.
This part of ISO 7500 applies to dead-weight machines, lever-type creep testing machines and direct-spring-
loading machines.
1)
Machines with a force-measuring system should be verified in accordance with ISO 7500-1, Metallic
materials — Verification of static uniaxial testing machines — Part 1: Tension/compression testing machines —
Verification and calibration of the force-measuring system.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated
references, only the edition cited applies. For undated references, the latest edition of the referenced
document (including any amendments) applies.
ISO 204, Metallic materials — Uniaxial creep testing in tension — Method of test
ISO 376, Metallic materials — Calibration of force-proving instruments used for the verification of uniaxial
testing machines

1) For the purposes of this part of ISO 7500, a force-measuring system comprises the load cell plus conditioning plus
indicator.
© ISO 2006 – All rights reserved 1

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ISO 7500-2:2006(E)
3 Symbols and their meanings
For the purposes of this part of ISO 7500, the symbols in Table 1 apply.
For the purposes of this part of ISO 7500 the following types of creep testing machines are recognized:
⎯ dead-weight machines, with or without guides (Figures A.1 and A.2);
⎯ overslung or underslung lever machines (Figures A.3, A.4 and A.5);
⎯ jockey-weight machines, either with overslung or underslung lever (Figures A.6 and A.7);
⎯ any combination of the types of machines mentioned above (Figure A.8);
⎯ testing machines with force applied by a spring (Figure A.9).
Table 1 — Symbols and meaning
Symbol Unit Meaning
F N Maximum force of the force range of the testing machine
N
F N Force applied to creep testing machine:
i
a
 ⎯ for dead-weight machines: F = mg
i n
a
 ⎯ for lever-type machines: F = mg R
i n
 ⎯ for jockey-weight machines, the value of F is indicated on the scale of the
i
machine

⎯ for spring-type machines: force applied to spring-calibration device
F N True force indicated by the force-proving instrument
F N Arithmetic mean of several measurements of F or F at the same discrete force
i
F , F N Highest or lowest value of F or F at the same discrete force
max min i
F N Force applied by the masses on the scale pan of the machines
M
F N Lower limit of the verified force range
V
R — Lever ratio used for the verification
b % Relative repeatability error of the force-measuring system of the testing machine
d N Discrimination threshold
d N Discrimination threshold corresponding to 20 % of the maximum force of the force
1
range (F )
N
a % Relative discrimination threshold
q % Relative accuracy error of the force-measuring system of the testing machine
a 2 2
g = standard acceleration of free fall, in m/s (g = 9,806 65 m/s ). This quantity was earlier also called “standard
n n
acceleration due to gravity”.
4 General inspection of the testing machine
The verification of the testing machine shall only be carried out if the machine is in good working order. For
this purpose, a general inspection of the machine shall be carried out before verification of the force applied
by the machine (see Annex A).
2 © ISO 2006 – All rights reserved

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ISO 7500-2:2006(E)
5 Verification of the force applied by the testing machine
5.1 General
This verification shall be carried out for each of the force ranges used. If the testing machine has several force
2)
ranges, each force range shall be regarded as a separate testing machine.
This verification shall be carried out using tension-force-proving instruments. These instruments shall be in
accordance with ISO 376. The class of the force-proving instrument shall be equal or superior to the class
determined for the creep testing machine.
5.2 Masses
The masses used to apply the forces during the verification can be either
a) known masses with an accuracy equal to or better than ± 0,1 %, verified at least every five years, or
b) masses dedicated for use with a given creep testing machine, applied in the same sequence as during
the test.
5.3 Determination of the discrimination threshold
The discrimination threshold (d) of the machine is defined as the smallest increment of force that can be
applied and detected during the verification procedure.
The discrimination threshold (d) shall be determined at 20 %, 60 % and 100 % of the maximum force F of the
N
force range. If forces of a magnitude less than 0,2 F are to be tested (see 5.2), the discrimination threshold
N
shall additionally be determined at the lower limit of the provided testing range
...