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It is necessary to investigate the elastic-plastic fatigue crack growth behavior under mixed mode loading in order to evaluate an ultimate strength of actual structures under seismic load. In this study, tension-compression fatigue tests for CT specimens and torsion fatigue tests for plate specimens with notches were performed for aluminum alloy A2017 to compare crack growth behavior under tension-compression and torsion loadings. In tension-compression fatigue tests, the fatigue crack propagation was share mode. J-integral range, J, was calculated by finite element method and crack growth characteristic was evaluated by J. In torsion fatigue tests, the fatigue crack propagation was also share mode. As a result of fracture surface observation, it was found from crack front geometry that crack growth rate on the surface was faster than that of inside. The J at the crack front was calculated by finite element method and used to evaluate crack growth characteristic. These results corresponded to the mode II crack growth characteristics obtained under small scale yielding.

Evaluation of Elastic-Plastic Fatigue Crack Growth Characteristics under Mixed-Mode Condition for Aluminum Alloy A2017