M00001735
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ISO 7539-6 3rd Edition, October 15, 2011 Corrosion of metals and alloys — Stress corrosion testing — Part 6: Preparation and use of precracked specimens for tests under constant load or constant displacement
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Availability date: 07/13/2021
Description / Abstract:
This part of ISO 7539 covers 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 Annex A.
The term "metal" as used in this part of ISO 7539 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 ISO 7539-9.
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.