1. Fatigue cracking tests

1.1 Introduction

By plotting the Wöhler curve, we can determine the fatigue strength, which can be considered as the maximum stress the material can withstand without crack initiation after a given service life. However, experience has shown that, in parts in service, there may be machining, welding or casting defects, or corrosion pitting, from which a fatigue crack can propagate. This is particularly true of real structures, where most of the service life is taken up by crack propagation. For this reason, in addition to endurance initiation resistance [M 4 170] , the study of crack propagation is necessary. It is also the only way of accurately determining the residual service life of a part with...

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Fatigue cracking tests

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page Fatigue tests - Low-cycle fatigue, crack propagation and complex loadings

Resistance to low-cycle fatigue initiation

Bibliography

(1) - JOHNSON (H.H.), PARIS (P.C.) - Subcritical flow growth. - - Eng. Fracture Mechanics (USA), 1(1), p. 3-45 (1968).
(2) - SARRAZIN-BAUDOUX (C.) et al - Fatigue propagation of short and long cracks in gaseous hydrogen environment...

Standards and norms

Metallic materials — Fatigue tests — Fatigue crack propagation test method - ISO 12108:2018 - 07-18
Standard Test Method for Measurement of Fatigue Crack Growth Rates - ASTM E647-15e1 - 05-15
Metallic materials — Fatigue tests — Controlled axial deformation method - ISO 12106:2017 - 03-17
Metallic materials — Fatigue tests — Thermo-mechanical fatigue test method with controlled deformation - ISO 12111:2011...