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A fatigue crack growth model with load ratio effects

โœ Scribed by D. Kujawski; F. Ellyin

Publisher
Elsevier Science
Year
1987
Tongue
English
Weight
784 KB
Volume
28
Category
Article
ISSN
0013-7944

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โœฆ Synopsis

A

model for the fatigue crack propagation is developed which incorporates the bulk cyclic and low-cycle fatigue properties of the material. The model predicts the R-ratio effects on the fatigue crack growth at low and intermediate stress intensities. The concept is based on the product of stress and plastic strain-a measure of the plastic strain energy density-as the fatigue failure criterion within the 'process zone'. The analysis of the stress ratio at the crack-tip region is discussed, and relationships are proposed indicating its variation along the crack line. The predictions of the model are compared with the experimental data and the agreement is found to be fairly good.

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