クリープ下における径路独立積分とき裂エネルギ密度

概要

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The crack energy density ε_J-integral which is the path independent expression of εare applied to creep problem and it is shown that εand its differential coefficient with respect to time ε_<st> are valid parameters to creep crack without any restriction on constitutive equation. The contents are as follows; (1) εand ε_<st> are introduced as creep crack parameters and it is shown that ε_<st> can be evaluated by path independent integral ε_<Jst> obtained by differentiating ε_J with respect to time. (2) It is pointed out that J'-integral (C^*-parameter) can be evaluated by newly-introduced ε'_<Jst> which is a path independent integral even to non-steady state creep, and the physical meaning of J' is clarified based on ε'_<Jst>. Also the relation between ε_<st> and J' is discussed ant the role of J' is made clear. (3) The validities of εand ε_<st> as creep crack parameters are numerically verified through finite element analyses.
一般社団法人日本機械学会の論文
1984-06-25