SIST EN ISO 7539-4:1999

Corrosion of metals and alloys - Stress corrosion testing - Part 4: Preparation and use of uniaxially loaded tension specimens (ISO 7539-4:1989)

Covers procedures for designing, preparing and using uniaxially loaded tension specimens. These specimens may be used to test a variety of product forms (for example sheet, plate, tubes, wire or rod as well as parts joined by welding, riveting, or other methods). Uniaxially loaded tensile specimens may be stressed quantitatively with equipment for application of either a constant load, a constant strain or an increasing load or strain.

Korrosion der Metalle und Legierungen - Prüfung der Spannungsrißkorrosion - Teil 4: Vorbereitung und Anwendung von einachsig belasteten Zugproben (ISO 7539-4:1989)

Der vorliegende Teil von ISO 7539 behandelt Verfahren für die Gestaltung, Vorbereitung und Anwendung von einachsig belasteten Zugproben zur Untersuchung der Anfälligkeit von Metallen für Spannungskorrosion. In diesem Teil von ISO 7539 werden mit der Benennung "Metall" auch Legierungen erfaßt. Zugproben können zum Prüfen einer Vielzahl von Erzeugnisformen verwendet werden, einschließlich Blech, Draht, Band und Rohre sowie auch Teile, die durch Schweißen, Nieten oder andere Verfahren verbunden sind. Gekerbte Proben könnenebenfalls verwendet werden.

Corrosion des métaux et alliages - Essais de corrosion sous contrainte - Partie 4: Préparation et utilisation des éprouvettes pour essais en traction uniaxiale (ISO 7539-4:1989)

1.1 La présente partie de l'ISO 7539 couvre les procédures de définition, de préparation et d'utilisation d'éprouvettes pour essais en traction uniaxiale, servant à évaluer la sensibilité d'un métal à la corrosion sous contrainte. Pour les besoins de la présente partie de l'ISO 7539, le terme « métal » inclut également les alliages. 1.2 Les éprouvettes pour essais en traction sont adaptées pour tester une multitude de formes de produits : plaques, barres, fils, tôles et tubes ainsi que les pièces assemblées par soudage, rivetage, ou autres procédés. Les éprouvettes entaillées peuvent également être utilisées (voir 5.1.3). 1.3 Les éprouvettes chargées en traction uniaxiale peuvent être mises sous contrainte quantitativement, selon l'équipement utilisé, soit par application d'une charge ou d'une déformation constante, soit par application d'une charge ou d'une déformation croissante.

Korozija kovin in zlitin - Ugotavljanje pokanja zaradi napetostne korozije - 4. del: Priprava in uporaba enoosno natezno obremenjenih preskušancev (ISO 7539-4:1989)

General Information

• Status: Published
• Publication Date: 30-Sep-1999
• ICS: 77.060 - Corrosion of metals
• Technical Committee: IPKZ - Protection of metals against corrosion
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 01-Oct-1999
• Due Date: 01-Oct-1999
• Completion Date: 01-Oct-1999
• Ref Project: EN ISO 7539-4:1995 - Corrosion of metals and alloys - Stress corrosion testing - Part 4: Preparation and use of uniaxially loaded tension specimens (ISO 7539-4:1989)

Standards Content (Sample)

SLOVENSKI STANDARD
SIST EN ISO 7539-4:1999
01-oktober-1999
Korozija kovin in zlitin - Ugotavljanje pokanja zaradi napetostne korozije - 4. del:
Priprava in uporaba enoosno natezno obremenjenih preskušancev (ISO 7539-
4:1989)
Corrosion of metals and alloys - Stress corrosion testing - Part 4: Preparation and use of
uniaxially loaded tension specimens (ISO 7539-4:1989)
Korrosion der Metalle und Legierungen - Prüfung der Spannungsrißkorrosion - Teil 4:
Vorbereitung und Anwendung von einachsig belasteten Zugproben (ISO 7539-4:1989)
Corrosion des métaux et alliages - Essais de corrosion sous contrainte - Partie 4:
Préparation et utilisation des éprouvettes pour essais en traction uniaxiale (ISO 7539-
4:1989)
Ta slovenski standard je istoveten z: EN ISO 7539-4:1995
ICS:
77.060 Korozija kovin Corrosion of metals
SIST EN ISO 7539-4:1999 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN ISO 7539-4:1999

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SIST EN ISO 7539-4:1999

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SIST EN ISO 7539-4:1999

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SIST EN ISO 7539-4:1999
INTERNATIONAL
STANDARD
First edition
1989-12-01
Corrosion of metals and alloys - Stress
corrosion testing -
Part 4:
Preparation and use of uniaxially loaded tension
specimens
Essais de corrosion sous contrainte -
Corrosion des mhtaux et alfiages -
Partie 4: Prhparation et utilisation des bprouvettes pour essais en traction uniaxiale
Reference number
ISO 7539-4 : 1989 (E)

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SIST EN ISO 7539-4:1999
ISO 7539-4 : 1989 (El
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of
national Standards bodies (ISO member bedies). The work of preparing International
Standards is normally carried out through ISO technical committees. Esch 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, govern-
mental 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.
Draft International Standards adopted by the technical committees are circulated to
the member bodies for approval before their acceptance as International Standards by
the ISO Council. They are approved in accordance with ISO procedures requiring at
least 75 % approval by the member bodies voting.
International Standard ISO 7539-4 was prepared by Technical Committee ISO/TC 156,
Corrosion of metals and alfoys.
ISO 7539 consists of the following Parts, under the general title Corrosion of metals
and alloys - Stess corrosion testing :
-
Part 1: General guidance on testing procedures
-
Part 2: Preparation and use of bent-beam specimens
Part 3: Preparation and use of U-bend specimens
-
Part 4: Preparation and use of uniaxially loaded tension specimens
-
Part 5: Preparation and use of C-ring specimens
-
Part 6: Preparation and use of pre-cracked specimens
- Part 7: Slow strain rate testing
-
Part 8: Preparation and use of welded specimens
0 ISO 1989
All rights reserved. No patt of this publication may be reproduced or utilized in any form or by any
means, electronie or mechanical, including photocopying and microfilm, without Permission in
writing from the publisher.
International Organization for Standardization
Case postale 56 l CH-121 1 Geneve 20 l Switzerland
Printed in Switzerland
ii

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SIST EN ISO 7539-4:1999
ISO 7539-4 : 1989 (E)
Introduction
This part of ISO 7539 is one of a series giving procedures for designing, preparing and
using various forms of test specimen to carry out tests to establish a metals resistance
to stress corrosion.
Esch of the Standards in the series needs to be read in association with ISO 7539-1.
This helps in the choice of an appropriate test procedure to suit particular cir-
cumstances as weil as giving guidance towards assessing the significance of the
results of the tests.

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SIST EN ISO 7539-4:1999
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SIST EN ISO 7539-4:1999
ISO 7539-4 : 1989 (E)
INTERNATIONAL STANDARD
Corrosion of metals and alloys - Stress corrosion
testing -
Part 4:
Preparation and use of uniaxially loaded tension specimens
3 Definitions
1 Scope
For the purposes of this part of ISO 7539, the definitions given
1.1 This part of ISO 7539 covers procedures for designing,
in ISO 7539-1 are applicable.
preparing and using uniaxially loaded tension test specimens
for investigating the susceptibility of a metal to stress cor-
rosion.
4 Principle
The term “metal” as used in this part of ISO 7539 includes
4.1 The test consists in subjecting a specimen to constant
alloys.
load, constant strain or increasing load or strain with a view to
determining stress corrosion susceptibility by reference to one
or more of the Parameters enumerated in clause 7.
1.2 Tension test specimens are adaptable for testing a wide
variety of product forms, including plate, rod, wire, sheet and
tubes, as weil as Parts joined by welding, riveting, or other
4.2 Corrosive environments may Cause a deterioration of the
methods. Notched specimens may also be used (see 5.1.3). proper-Ges of stressed materials beyond those observed with
the same combination of environment and material when the
latter is not subjected to stress. This enhanced deterioration
1.3 Uniaxially loaded tensile specimens may be stressed
may be expressed in a number of different ways for the purpose
quantitatively with equipment for application of either a con-
of assessing stress corrosion susceptibility.
stant load, a constant strain or an increasing load or strain.
4.3 The commonest form of deterioration due to stress cor-
rosion involves the initiation and growth of Cracks, one or more
2 Normative references of which may eventually lead to total failure of a specimen if the
test is conducted for an appropriate time. In the absence of
total failure, the mechanical properties of the specimens will be
The following Standards contain provisions which, through
impaired by an amount depending upon the extent of Crack
reference in this text, constitute provisions of this part of
development or the growth of pits or fissures.
ISO 7539. At the time of publication, the editions indicated
were valid. All Standards are subject to revision, and Parties to
agreements based on this part of ISO 7539 are encouraged to 4.4 Wide variations in test results may be obtained for a
investigate the possibility of applying the most recent editions given metal and environment even when testing nominally
of the Standards indicated below. Members of IEC and ISO identical specimens and the replication of tests is frequently
maintain registers of currently valid International Standards. necessary. If specimens are prepared to different sizes or orien-
tations or are subjected to different stressing pressures, test
I S 0 6992 : 1984, Me talic ma terials - Tensie testing. results may be even more variable.
ISO 7539-1 : 1987, Corrosion of metals and alloys - Stress
5 Spetimens
Part 7: General guidance on testing pro-
corrosion testing -
cedures.
5.1 General
ISO 7539-6 : 1989, Corrosion of metals and alloys - Stress
Part 6: Preparation and use of pre-cracked 5.1.1 Spetimens of constant Cross-section may be circular,
corrosion testing -
Square, rectangular, annular or, in special cases, of other forms.
specimens.
1

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SIST EN ISO 7539-4:1999
ISO 7539-4 : 1989 (El
On the other hand, small Cross-section specimens are more dif-
5.1.2 Spetimens having tapered gauge lengths may be
employed for the purpose of obtaining a range of initial ficult to machine and their Performance is more likely to be
influenced by extraneous stress concentrations resulting from
Stresses.
non-axial Ioading, corrosion pits or other forms of attack, for
example general corrosion. In the case of machined specimens,
5.1.3 Tension specimens containing a machined notch or in
dimensions greater than 10 mm in gauge length and 3,0 mm in
which a mechanical pre-Crack has been started may also be
section are preferred.
used. In the case of notched specimens, a triaxial stress state is
present in the vicinity of the notch. In addition, the axial stress
5.2 Preparation of specimens
at the root of the notch will be greater than the nominal stress
derived using the minimum Cross-sectional area at the root of
5.2.1 The pronounced effect of surface conditions on the
the notch. The maximum stress at the notch tan be calculated
time required to initiate stress corrosion cracking in certain
from the product of this nominal stres and the stress concen-
combinations sf metal and environment is well established. 06
tration factor KT for the specific notch. Pre-cracked specimens
particular importante is the avoidance of stress concentrations,
are dealt with separately in ISO 7539-6.
machining darnage and Chemical contamination. Unless it is
desired to evaluate the as-supplied or as-fabricated surface, the
5.1.4 Finished products may be tested in the manufactured
final preparation usually preferred is a mechanical process
condition by agreement between the Parties.
followed by degreasing. Stress intensification at surface
irregularities is usually more important in the initia
...