EN ISO 7539-6:2003
(Main)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 (ISO 7539-6:2003)
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 (ISO 7539-6:2003)
ISO 7539-6:2002 covers procedures for designing, preparing and using pre-cracked specimens for investigating susceptibility to stress corrosion. It gives recommendations for the design, preparation and use of pre-cracked specimens for investigating susceptibility to stress corrosion.
The term "metal" as used in this part of ISO 7539 includes alloys.
Because of the need to confine plasticity at 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.
Korrosion der Metalle und Legierungen - Prüfung der Spannungsrisskorrosion - Teil 6: Vorbereitung und Anwendung von angerissenen Proben für die Prüfung unter konstanter Kraft oder konstanter Verformung (ISO 7539-6:2003)
1.1 Dieser Teil von ISO 7539 behandelt Verfahren für die Gestaltung, Vorberei-tung und Anwendung von ange-ris-senen Proben zur Untersuchung der Beständigkeit von Me-tallen gegen Spannungsrisskorrosion. Empfehlungen für gekerbte Proben werden im Anhang A an-gegeben.
In diesem Teil von ISO 7539 werden mit der Benennung �Metall" auch Legierungen erfasst.
1.2 Für die Bewertung dünner Erzeugnisse, z. B. Feinblech oder Draht, sind angerisse-ne Proben wegen der Notwendigkeit, die Plastizität auf die Rissspitze zu beschränken, nicht geeignet; sie werden im Allgemeinen für die Bewertung dickerer Erzeugnisse angewendet, zu denen Grobble-che, Stangen und Schmiedestücke gehören. Sie können auch auf miteinander verschweißte Teile angewendet werden.
1.3 Zur Beanspruchung der angerissenen Proben dürfen Prüfeinrichtungen angewendet werden, die eine konstante Kraft aufbringen oder die eine Vorrichtung aufnehmen können, mit der eine konstante Verformung an den Kraftangriffspunkten erzeugt wird. Prüfungen mit konstanter Kraft oder konstanter Verformung sind nach ISO 7539-9 durchzuführen.
1.4 Ein besonderer Vorteil von angerissenen Proben mit bekannter Geometrie, die bekannten Spannungen ausgesetzt werden, ist die Möglichkeit der Ermittlung von Daten zur Abschätzung kritischer Fehlergrößen, bei deren Überschreitung das Auftreten von Spannungsrissen möglich ist. Mit Hilfe von angerissenen Proben ist es ferner möglich, die Ausbreitungsgeschwindigkeit von Spannungskorrosionsrissen zu bestimmen. Diese Daten dürfen für die Überwachung von Teilen herangezogen werden, in denen beim Einsatz Fehler auftreten.
Corrosion des métaux et alliages - Essais de corrosion sous contrainte - Partie 6: Préparation et utilisation des éprouvettes préfissurées pour essais sous charge constante ou sous déplacement constant (ISO 7539-6:2003)
L'ISO 7539-6:2003 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. Elle donne des recommendations pour la conception, la préparation et l'utilisation d'éprouvettes préfissurées pour évaluer la sensibilité à la corrosion sous contrainte.
Pour les besoins de la présente partie de l'ISO 7539, le terme «métal» inclut également les alliages.
Comme il est nécessaire de confiner la déformation plastique 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.
Korozija kovin in zlitin - Preskušanje napetostne korozije - 6. del: Priprava in uporaba preskušancev z umetno razpoko za preskuse pri konstantni obremenitvi ali konstantni deformaciji (ISO 7539-6:2003)
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2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Korozija kovin in zlitin - Preskušanje napetostne korozije - 6. del: Priprava in uporaba preskušancev z umetno razpoko za preskuse pri konstantni obremenitvi ali konstantni deformaciji (ISO 7539-6:2003)Korrosion der Metalle und Legierungen - Prüfung der Spannungsrisskorrosion - Teil 6: Vorbereitung und Anwendung von angerissenen Proben für die Prüfung unter konstanter Kraft oder konstanter Verformung (ISO 7539-6:2003)Corrosion des métaux et alliages - Essais de corrosion sous contrainte - Partie 6: Préparation et utilisation des éprouvettes préfissurées pour essais sous charge constante ou sous déplacement constant (ISO 7539-6:2003)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 (ISO 7539-6:2003)77.060Korozija kovinCorrosion of metalsICS:Ta slovenski standard je istoveten z:EN ISO 7539-6:2003SIST EN ISO 7539-6:2003en01-december-2003SIST EN ISO 7539-6:2003SLOVENSKI
STANDARDSIST EN ISO 7539-6:19991DGRPHãþD
EUROPEAN STANDARDNORME EUROPÉENNEEUROPÄISCHE NORMEN ISO 7539-6February 2003ICS 77.060Supersedes EN ISO 7539-6:1995English versionCorrosion of metals and alloys - Stress corrosion testing - Part6: Preparation and use of pre-cracked specimens for tests underconstant load or constant displacement (ISO 7539-6:2003)Corrosion des métaux et alliages - Essais de corrosionsous contrainte - Partie 6: Préparation et utilisation deséprouvettes préfissurées pour essais sous chargeconstante ou sous déplacement constant (ISO 7539-6:2003)Korrosion der Metalle und Legierungen - Pru¨fung derSpannungsrisskorrosion - Teil 6: Vorbereitung undAnwendung von angerissenen Proben für die Prüfung unterkonstanter Kraft oder konstanter Verformung (ISO 7539-6:2003)This European Standard was approved by CEN on 7 February 2003.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 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 Management Centre has the same status as the officialversions.CEN members are the national standards bodies of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece,Hungary, Iceland, Ireland, Italy, Luxembourg, Malta, Netherlands, Norway, Portugal, Slovak Republic, Spain, Sweden, Switzerland andUnited Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMITÉ EUROPÉEN DE NORMALISATIONEUROPÄISCHES KOMITEE FÜR NORMUNGManagement Centre: rue de Stassart, 36
B-1050 Brussels© 2003 CENAll rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN ISO 7539-6:2003 ESIST EN ISO 7539-6:2003
2003-03-12ForewordThis document (EN ISO 7539-6:2003) has been prepared by Technical Committee ISO/TC 156"Corrosion of metals and alloys" in collaboration with Technical Committee CEN/TC 262"Metallic and other inorganic coatings", the secretariat of which is held by BSI.This European Standard shall be given the status of a national standard, either by publication ofan identical text or by endorsement, at the latest by August 2003, and conflicting nationalstandards shall be withdrawn at the latest by August 2003.This document supersedes EN ISO 7539-6:1995.According to the CEN/CENELEC Internal Regulations, the national standards organizations ofthe following countries are bound to implement this European Standard: Austria, Belgium, CzechRepublic, Denmark, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy,Luxembourg, Malta, Netherlands, Norway, Portugal, Slovak Republic, Spain, Sweden,Switzerland and the United Kingdom.Endorsement noticeThe text of ISO 7539-6:2003 has been approved by CEN as EN ISO 7539-6:2003 without anymodifications.NOTE
Normative references to International Standards are listed in Annex ZA (normative).SIST EN ISO 7539-6:2003
Reference numberISO 7539-6:2003(E)© ISO 2003
INTERNATIONAL STANDARD ISO7539-6Second edition2003-02-15Corrosion of metals and alloys — Stress corrosion testing — Part 6: Preparation and use of pre-cracked specimens for tests under constant load or constant displacement Corrosion des métaux et alliages — Essais de corrosion sous contrainte — Partie 6: Préparation et utilisation des éprouvettes préfissurées pour essais sous charge constante ou sous déplacement constant
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ISO 7539-6:2003(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.4 5 Specimens.5 6 Initiation and propagation of fatigue cracks.23 7 Procedure.25 8 Test report.33 Annex A (normative)
Use of notched specimens for stress corrosion tests.35 Annex B (normative)
Determination of crack growth velocity.38
ISO 7539-6:2003(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 7539-6 was prepared by Technical Committee ISO/TC 156, Corrosion of metals and alloys, in collaboration with the National Physical Laboratory (United Kingdom). This second edition cancels and replaces the first edition (ISO 7539-6:1989), Clauses 1, 2, 3, 4 and 7; subclause 5.2.5 d); Figures 1, 2 d), 5 b), 8, 9, and 10; Annexs A and B of which have been technically revised. 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 7539-6:2003(E) © ISO 2003 — All rights reserved 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 Scope 1.1 This part of ISO 7539 covers procedures for designing, preparing and using pre-cracked specimens for investigating susceptibility to stress corrosion. It gives recommendations for the design, preparation and use of pre-cracked specimens for investigating susceptibility to stress corrosion. Recommendations concerning notched specimens are given in Annex A. The term “metal” as used in this part of ISO 7539 includes alloys. 1.2 Because of the need to confine plasticity at 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 loaded with equipment for application of a constant load or can incorporate a device to produce a constant displacement at the loading points. Tests conducted under increasing displacement or increasing load are dealt with in ISO 7539-9. 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. The latter data may be taken into account when monitoring parts containing defects during service. 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, Corrosion of metals and alloys — Stress corrosion testing — Part 1: General guidance on testing procedures ISO 11782-2, Corrosion of metals and alloys — Corrosion fatigue testing — Part 2: Crack propagation testing using precracked specimens SIST EN ISO 7539-6:2003
ISO 7539-6:2003(E) 2 © ISO 2003 — All rights reserved 3 Terms and definitions For the purposes of this part of ISO 7539, the definitions given in ISO 7539-1 and the following apply. 3.1 crack length a effective crack length measured from the crack tip to either the mouth of the notch or the loading point axis depending on the specimen geometry 3.2 specimen width W effective width of the specimen measured from the back face to either the face containing the notch or the loading plane depending on the specimen geometry 3.3 specimen thickness B side-to-side dimension of the specimen being tested 3.4 reduced thickness at side grooves Bn minimum side-to-side dimension between the notches in side-grooved specimens 3.5 specimen half-height H 50 % of the specimen height measured parallel to the direction of load application for compact tension, double cantilever beam and modified wedge opening loaded test pieces 3.6 load P that load which, when applied to the specimen, is considered positive if its direction is such as to cause the crack faces to move apart 3.7 deflection at loading point axis VLL crack opening displacement produced at the loading line during the application of load to a constant displacement specimen 3.8 deflection away from the loading line V0 crack ope
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