Corrosion of metals and alloys. Stress corrosion testing Preparation and use of precracked specimens for tests under constant load or constant displacement

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Hardcopy , PDF

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English

Published date

27-11-2018

Publisher

British Standards Institution

This document specifies procedures for designing, preparing and using precracked specimens for investigating susceptibility to stress corrosion.

This document specifies procedures for designing, preparing and using precracked specimens for investigating susceptibility to stress corrosion. It gives recommendations for the design, preparation and use of precracked specimens for investigating susceptibility to stress corrosion. Recommendations concerning notched specimens are given in AnnexA.

The term “metal” as used in this document includes alloys.

Because of the need to confine plasticity at the crack tip, precracked 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.

Precracked specimens can 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 ISO7539‑9.

A particular advantage of precracked specimens is that they allow data to be acquired, from which critical defect sizes, above which stress corrosion cracking can 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 can be taken into account when monitoring parts containing defects during service.

Committee	ISENFE/8
DocumentType	Standard
ISBN	9780580993268
Pages	46
ProductNote	THIS STANDARD ALSO REFER TO ISO 7539‑1.
PublisherName	British Standards Institution
Status	Current
Supersedes	BS EN ISO 7539-6:2011

Standards	Relationship
ISO 7539-6:2018	Identical
EN ISO 7539-6:2011	Identical
ISO 7539-6 : 2018 FR	Identical
EN ISO 7539-6:2018	Identical

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BS EN ISO 7539-6:2018

Corrosion of metals and alloys. Stress corrosion testing Preparation and use of precracked specimens for tests under constant load or constant displacement

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