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Load-controlled fatigue crack growth tests were carried out on several kinds of ductile materials over a wide region from the linear elastic to the post-yield region, and crack closure behavior was monitored through the tests. The effect of plasticity on crack growth behavior and the limit of validity of the linear fracture mechanics parameters were discussed along with ASTM E647 specimen size requirements. The bulk cyclic plastic strain, even if so small, had the effect to lower the crack opening point. ASTM size requirements were found rational for CT-specimens, while for center cracked specimens were not always sufficient to provide a stable relationship between crack growth rate, da/dn, and stress intensity range, ΔK.In addition, peculiar growth behavior of post-yield crack under variable loadings was also briefly noted in the present study.

Elastic-plastic fatigue crack growth under load control (The limit of validity of linear fracture mechanics parameters and the effect of plasticity)