EN ISO 7539-9:2008

Corrosion of metals and alloys - Stress corrosion testing - Part 9: Preparation and use of pre-cracked specimens for tests under rising load or rising displacement (ISO 7539-9:2003)

ISO 7539-9:2003 covers procedures for designing, preparing and using pre-cracked specimens for investigating the susceptibility of metal to stress corrosion cracking by means of tests conducted under rising load or rising displacement. The term "metal" includes alloys.
Because of the need to confine plasticity to the crack tip, pre-cracked specimens are not suitable for the evaluation of thin products such as sheet or wire and are generally used for thicker products including plate, bar and forgings. They can also be used for parts joined by welding.
A particular advantage of pre-cracked specimens is that they allow data to be acquired from which critical defect sizes, above which stress corrosion cracking may occur, can be estimated for components of known geometry subjected to known stresses. They also enable rates of stress corrosion crack propagation to be determined.
A principal advantage of the test is that it takes into account the potential impact of dynamic straining on the threshold for stress corrosion cracking.

Korrosion der Metalle und Legierungen - Prüfung der Spannungsrisskorrosion - Teil 9: Vorbereitung und Anwendung von angerissenen Proben für die Prüfung mit zunehmender Kraft oder zunehmender Verformung (ISO 7539-9:2003)

1.1   Dieser Teil von ISO ISO 7539 behandelt Verfahren für die Gestaltung, Vorbereitung und Anwendung von angerissenen Proben zur Untersuchung der Beständigkeit von Metallen gegen Spannungsrisskorrosion mith Hilfe von Prüfungen, die mit zunehmender Kraft oder zunehmender Verformung durchgeführt werden. Prüfungen mit konstanter Kraft oder konstanter Verformung werden in ISO ISO 7539 6 behandelt.
In diesem Teil von ISO ISO 7539 werden mit der Benennung „Metall“ auch Legierungen erfasst.
1.2   Für die Bewertung dünner Produkte, z. B. Feinbleche oder Drähte, sind angerissene Proben nicht geeignet, weil die Notwendigkeit besteht, die Plastizität auf die Rissspitze zu beschränken; sie werden im Allgemeinen zur Bewertung dickerer Produkte angewendet, zu denen Grobbleche, Stangen und Schmiede¬stücke gehören. Sie können auch zur Bewertung von Schweißverbindungen angewendet werden.
1.3   Zur quantitativen Beanspruchung der angerissenen Proben darf eine Prüfeinrichtung angewendet werden, die an den Kraftangriffspunkten eine monoton zunehmende Kraft oder Verformung aufbringt.
1.4   Ein besonderer Vorteil angerissener Proben mit bekannter Geometrie, die bekannten Spannungen aus¬gesetzt werden, ist die Möglichkeit zur Ermittlung von Daten zur Abschätzung kritischer Fehlergrößen, bei deren Überschreitung das Auftreten von Spannungsrissen möglich ist. Mith Hilfe von angerissenen Proben ist es ferner möglich, die Ausbreitungsgeschwindigkeit von Spannungskorrosionsrissen zu bestimmen.
1.5   Der wichtigste Vorteil dieser Prüfung ist, dass der potentzielle Einfluss einer dynamischen Verformung auf den Grenzwert zur Auslösung von durch Spannungskorrosion erzeugten Rissen berücksichtigt wird.
1.6   Nach diesem Verfahren können bei einer ausreichend niedrigen Beanspruchungsgeschwindigkeit kleinere oder gleich große KISSC Werte rascher ermittelt werden als nach dem Verfahren mit konstanter Kraft oder Verformung.

Corrosion des métaux et alliages - Essais de corrosion sous contrainte - Partie 9: Préparation et utilisation des éprouvettes préfissurées pour essais sous charge croissante ou sous déplacement croissant (ISO 7539-9:2003)

L'ISO 7539-9:2003 couvre les procédures de définition, de préparation et d'utilisation d'éprouvettes préfissurées servant à évaluer la sensibilité d'un métal à la corrosion sous contrainte à l'aide d'essais sous charge croissante ou sous déplacement croissant. Le terme «métal» inclut également les alliages.
Comme il est nécessaire de maintenir la plasticité en fond de fissure, les éprouvettes préfissurées ne se prêtent pas à l'évaluation des produits minces tels que les tôles minces et les fils, et sont généralement utilisées pour des produits plus épais tels que les tôles fortes, les barres et les pièces forgées. Elles peuvent aussi être utilisées pour des pièces assemblées par soudage.
Les éprouvettes préfissurées présentent l'avantage de permettre l'acquisition de données dont on peut déduire les tailles critiques de défaut au-delà desquelles une fissuration par corrosion sous contrainte peut se produire au niveau de pièces de géométrie connue soumises à des efforts connus. Ces éprouvettes permettent également de déterminer la vitesse de propagation des fissures de corrosion sous contrainte.
L'essai a pour principal avantage de prendre en compte l'effet potentiel de la déformation dynamique sur la limite de fissuration par corrosion sous contrainte.

Korozija kovin in zlitin - Preskušanje napetostne korozije - 9. del: Priprava in uporaba preskušancev z umetno razpoko za preskuse pri naraščajoči obremenitvi ali naraščajoči deformaciji (ISO 7539-9:2003)

General Information

• Status: Withdrawn
• Publication Date: 15-Apr-2008
• Withdrawal Date: 24-Aug-2021
• ICS: 77.060 - Corrosion of metals
• Technical Committee: CEN/TC 262 - Metallic and other inorganic coatings
• Drafting Committee: CEN/TC 262 - Metallic and other inorganic coatings
• Current Stage: 9960 - Withdrawal effective - Withdrawal
• Completion Date: 25-Aug-2021
• Ref Project: SIST EN ISO 7539-9:2008 - Corrosion of metals and alloys - Stress corrosion testing - Part 9: Preparation and use of pre-cracked specimens for tests under rising load or rising displacement (ISO 7539-9:2003)

Relations

• Replaced By: EN ISO 7539-9:2021 - Corrosion of metals and alloys - Stress corrosion testing - Part 9: Preparation and use of pre-cracked specimens for tests under rising load or rising displacement (ISO 7539-9:2021)
• Effective Date: 01-Sep-2021

Standards Content (Sample)

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Corrosion of metals and alloys - Stress corrosion testing - Part 9: Preparation and use of pre-cracked specimens for tests under rising load or rising displacement (ISO 7539-9:2003)Corrosion des métaux et alliages - Essais de corrosion sous contrainte - Partie 9: Préparation et utilisation des éprouvettes préfissurées pour essais sous charge croissante ou sous déplacement croissant (ISO 7539-9:2003)Korrosion von Metallen und Legierungen - Prüfung der Spannungsrisskorrosion - Teil 9: Vorbereitung und Anwendung von angerissenen Proben für die Prüfung mit zunehmender Kraft oder zunehmender Verformung (ISO 7539-9:2003)77.060Korozija kovinCorrosion of metalsICS:SIST EN ISO 7539-9:2008enTa slovenski standard je istoveten z:EN ISO 7539-9:200801-julij-2008SIST EN ISO 7539-9:2008SLOVENSKI
STANDARD
EUROPEAN STANDARDNORME EUROPÉENNEEUROPÄISCHE NORMEN ISO 7539-9April 2008ICS 77.060 English VersionCorrosion of metals and alloys - Stress corrosion testing - Part9: Preparation and use of pre-cracked specimens for tests underrising load or rising displacement (ISO 7539-9:2003)Corrosion des métaux et alliages - Essais de corrosionsous contrainte - Partie 9: Préparation et utilisation deséprouvettes préfissurées pour essais sous chargecroissante ou sous déplacement croissant (ISO 7539-9:2003)Korrosion von Metallen und Legierungen - Prüfung derSpannungsrisskorrosion - Teil 9: Vorbereitung undAnwendung von angerissenen Proben für die Prüfung mitzunehmender Kraft oder zunehmender Verformung (ISO7539-9:2003)This European Standard was approved by CEN on 21 March 2008.CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this EuropeanStandard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such nationalstandards may be obtained on application to the CEN Management Centre or to any CEN member.This European Standard exists in three official versions (English, French, German). A version in any other language made by translationunder the responsibility of a CEN member into its own language and notified to the CEN Management Centre has the same status as theofficial versions.CEN members are the national standards bodies of Austria, Belgium, Bulgaria, 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 STANDARDIZATIONCOMITÉ EUROPÉEN DE NORMALISATIONEUROPÄISCHES KOMITEE FÜR NORMUNGManagement Centre: rue de Stassart, 36
B-1050 Brussels© 2008 CENAll rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN ISO 7539-9:2008: E

Reference numberISO 7539-9:2003(E)© ISO 2003
INTERNATIONAL STANDARD ISO7539-9First edition2003-04-01Corrosion of metals and alloys — Stress corrosion testing —
Part 9: Preparation and use of pre-cracked specimens for tests under rising load or rising displacement Corrosion des métaux et alliages — Essais de corrosion sous contrainte —
Partie 9: Préparation et utilisation des éprouvettes préfissurées pour essais sous charge croissante ou sous déplacement croissant

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ISO 2003 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.
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ii © ISO 2003 — All rights reserved

ISO 7539-9:2003(E) © ISO 2003 — All rights reserved iii Contents Page Foreword.iv 1 Scope.1 2 Normative references.1 3 Terms and definitions.2 4 Principle.2 5 Specimens.3 6 Initiation and propagation of fatigue cracks.16 7 Procedure.18 8 Test report.23 Annex A (informative)
Determination of a suitable displacement rate for determining KISCC from constant displacement rate tests.24 Annex B (informative)
Determination of crack growth velocity.25 Annex C (informative)
Information on indirect methods for measuring crack length.26

ISO 7539-9:2003(E) iv © ISO 2003 — All rights reserved 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 7539-9 was prepared by Technical Committee ISO/TC 156, Corrosion of metals and alloys. ISO 7539 consists of the following parts, under the general title Corrosion of metals and alloys — Stress 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 for tests under constant load or constant displacement =Part 7: Slow strain rate testing =Part 8: Preparation and use of specimens to evaluate weldments =Part 9: Preparation and use of pre-cracked specimens for tests under rising load or rising displacement

INTERNATIONAL STANDARD ISO 7539-9:2003(E) © ISO 2003 — All rights reserved 1 Corrosion of metals and alloys — Stress corrosion testing —
Part 9: Preparation and use of pre-cracked specimens for tests under rising load or rising displacement
1 Scope 1.1 This part of ISO 7539 covers procedures for designing, preparing and using pre-cracked specimens for investigating the susceptibility of metal to stress corrosion cracking by means of tests conducted under rising load or rising displacement. Tests conducted under constant load or constant displacement are dealt with in ISO 7539-6. The term “metal” as used in this part of ISO 7539 includes alloys. 1.2 Because of the need to confine plasticity to the crack tip, pre-cracked specimens are not suitable for the evaluation of thin products such as sheet or wire and are generally used for thicker products including plate, bar and forgings. They can also be used for parts joined by welding. 1.3 Pre-cracked specimens may be stressed quantitatively with equipment for application of a monotonically increasing load or displacement at the loading points. 1.4 A particular advantage of pre-cracked specimens is that they allow data to be acquired from which critical defect sizes, above which stress corrosion cracking may occur, can be estimated for components of known geometry subjected to known stresses. They also enable rates of stress corrosion crack propagation to be determined. 1.5 A principal advantage of the test is that it takes into account the potential impact of dynamic straining on the threshold for stress corrosion cracking. 1.6 At sufficiently low loading rates, the KISCC determined by this method can be less than or equal to that obtained by constant load or displacement methods and can be determined more rapidly. 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 7539-1:1987, Corrosion of metals and alloys — Stress corrosion testing — Part 1: General guidance on testing procedures ISO 7539-6:—1), Corrosion of metals and alloys — Stress corrosion testing —Part 6: Preparation and use of pre-cracked specimens for tests under constant load or constant displacement
1) To be published. (Revision of ISO 7539-6:1989)

ISO 7539-9:2003(E) 2 © ISO 2003 — All rights reserved ISO 7539-7:—2), Corrosion of metals and alloys — Stress corrosion testing — Part 7: Slow strain rate testing ISO 11782-2:1998, Corrosion of metals and alloys — Corrosion fatigue testing — Part 2: Crack propagation testing using precracked specimens 3 Terms and definitions For the purposes of this document, the terms and definitions given in ISO 7539-6 as well as the following apply. 3.1 rate of change of crack opening displacement at loading plane VLL deflection at the loading point access measured over a fixed period 3.2 stress intensity factor at crack initiation KI-init stress intensity applied at the commencement of measurable crack growth 3.3 range of stress intensity factor ∆Kf, in fatigue algebraic difference between the maximum and minimum stress intensity factors in a cycle 3.4 displacement rate dq/dt rate of increase of the deflection either measured at the loading point axis or away from the loading line 4 Principle 4.1 The use of pre-cracked specimens acknowledges the difficulty of ensuring that crack-like defects, introduced during either manufacture or subsequent service, are totally absent from structures. Furthermore, the presence of such defects can cause a susceptibility to stress corrosion cracking, which in some materials (e.g. titanium) may not be evident from tests on smooth specimens under constant load. The principles of linear elastic fracture mechanics can be used to quantify the stress situation existing at the crack tip in a pre-cracked specimen or structure in terms of the plane strain-stress intensity. 4.2 The test involves subjecting a specimen, in which a crack has been developed from a machined notch by fatigue, to an increasing load or displacement during exposure to a chemically aggressive environment. The objective is to quantify the conditions under which environmentally-assisted crack extension can occur in terms of the threshold stress intensity for stress corrosion cracking, KISCC, and the kine
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