低K領域における2段ならびに3段多重変動荷重下の疲労き裂進展と開閉口挙動

概要

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The fatigue crack propagation rate and crack closure behavior under repeated two- and three-step loadings at low stress intensity level were investigated on an aluminum alloy A5083-0. The crack opening point, K_<op>, was found to be constant and was nearly equal to that for K_<H> in K_<max>-K_<op> relation for constant amplitude loading tests, where K_<H> was the highest K value in repeated multiple-step loading tests. Based on the effective stress intensity range, ΔK_<eff>, which is calculated considering the above mentioned behavior of K_<op>, the fatigue crack propagation life can be conservatively estimated by the linear accumulation law of crack propagation length adopting ΔK_<ef.f>-dl/dn relation for constant amplitude loading tests.
社団法人日本材料学会の論文
1979-10-15