Models for the estimation of weldment fatigue crack initiation life

It is well known that the total fatigue life ( N T) of welded joints consists of two phases: (1) the crack initiation life ( N I); and (2) the crack propagation life ( N P). The local stress or strain approach is commonly used to estimate the crack initiation life of welded joints. In the present pa...

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Bibliographic Details
Published in:International journal of fatigue 1997, Vol.19 (7), p.537-541
Main Authors: Hou, C.-Y., Charng, J.-J.
Format: Article
Language:English
Subjects:
Applied sciences
crack initiation life
Exact sciences and technology
Fatigue
Mechanical properties and methods of testing. Rheology. Fracture mechanics. Tribology
Metals. Metallurgy
total fatigue life
welded joints
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Summary:It is well known that the total fatigue life ( N T) of welded joints consists of two phases: (1) the crack initiation life ( N I); and (2) the crack propagation life ( N P). The local stress or strain approach is commonly used to estimate the crack initiation life of welded joints. In the present paper, the model predicted values of the ratio N I/ N T using the local stress approach for N I were compared with the experimental data reported in literature. It is found that the predicted trend is not consistent with the experimental data. An alternative approach termed “short-crack propagation based approach” is proposed to estimate N I. This approach gives more consistent N I/ N T trend when compared with the experimental data.
ISSN:0142-1123
1879-3452
DOI:10.1016/S0142-1123(97)00072-8