任意方向き裂エネルギー密度と荷重-変位曲線

概要

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Crack energy density in an arbitrary direction ε_φ is expected to describe fracture behaviors of a mixed-mode crack. It was shown previously that ε_φ can be evaluated by a path independent integral with practically sufficient accuracy. In this paper, as an another evaluation method of ε_φ, a method based on the relationship between ε_φ and load-displasement curves is discussed. The contents are as follows ; 1) A relationship between initial crack lengths, load-displacement curves and ε_φ which holds until cracks start to grow is derived by considering the strain energies of the specimens with different initial crack lengths. A method to evaluate ε_φ from load-displacement curves is proposed based on this relationship. 2) Based on the method, the evaluation of ε_φ is tried from load-displacement curves obtained by finite element analyses and also experiments for specimens under tension with a crack inclined to the loading axis, and it is shown that the method is practical for evaluating ε_φ through the comparisons with the theoretical values and the values evaluated by the path-independent integral.
一般社団法人日本機械学会の論文
1988-07-25