クリープき裂進展解析の損傷力学的方法における有限要素依存性と応力特異性

概要

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Mesh dependence in finite-element analysis of creep crack growth by means of the continuum damage mechanics approach is discussed. A series of numerical analyses are first performed for a plate specimen with a central crack to show the characteristics of the mesh dependence. Then, strain localization is discussed in relation to the mesh dependence phenomenon. It is shown that the bifurcation localization, if any exists, will have no obvious effects on the mesh dependence. Finally, stress singularity due to boundary constraints, such as those observed at the crack-tip, is shown to be a controlling factor in the present mesh dependence problem. In order to prevent mesh dependence induced by the stress singularity, incorporation of ideal plasticity into the analyses is suggested and the validity of the procedure is discussed briefly.
一般社団法人日本機械学会の論文
1993-08-25