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BS EN ISO 7539-9:2021

BS EN ISO 7539-9:2021

$167.15

Corrosion of metals and alloys. Stress corrosion testing – Preparation and use of pre-cracked specimens for tests under rising load or rising displacement

Published By Publication Date Number of Pages
BSI 2021 40
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1.1

This document specifies procedures for designing, preparing and using pre-cracked specimens for investigating the susceptibility of metal to stress corrosion cracking (SCC) by means of tests conducted under rising load or rising displacement. Tests conducted under constant load or constant displacement are dealt with in ISO 7539ā€‘6 .

The term ā€œmetalā€ as used in this document 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 can 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 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.

1.5

A principal advantage of the test is that it takes account of the potential impact of dynamic straining on the threshold for stress corrosion cracking.

1.6

At sufficiently low loading rates, the threshold stress intensity factor for susceptibility to stress corrosion cracking, 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.

PDF Catalog

PDF Pages PDF Title
2 undefined
6 Foreword
7 1 Scope
2 Normative references
3 Terms and definitions
8 4 Principle
9 5 Specimens
5.1 General
10 5.2 Specimen design
17 5.3 Stress intensity factor considerations
21 5.4 Specimen preparation
23 5.5 Specimen identification
24 6 Initiation and propagation of fatigue cracks
25 7 Procedure
7.1 General
26 7.2 Environmental considerations
7.3 Environmental chamber
27 7.4 Environmental control and monitoring
28 7.5 Selection of initial K value prior to dynamic loading
7.6 Determination of KISCC
7.6.1 General
7.6.2 Determination schedule
30 7.6.3 Validation of test results
31 7.7 Determination of crack velocity
8 Test report
33 Annex A (informative) Determination of a suitable displacement rate for determining KISCC from constant displacement rate tests
35 Annex B (informative) Determination of crack growth velocity
36 Annex C (informative) Information on indirect methods for measuring crack length (see also ISO 21153)
38 Bibliography

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BS EN ISO 7539-9:2021
$167.15