Abstract
It is necessary to investigate the elastic-plastic fatigue crack growth behavior under complex loading in order to evaluate an ultimate strength of actual structures. 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 was calculated by empirical formula and crack growth characteristic was evaluated by J-integral range. In torsion fatigue tests, the fatigue crack propagation was share mode. As a result of fracture surface observation, it was found from crack front geometry that crack growth rate of surface was faster than that of inside. J-integral range of crack front was calculated by finite element method and crack growth characteristic was evaluated by J-integral range. These results corresponded to the mode II crack growth characteristics obtained under small scale yielding.
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