表面き裂の疲労き裂進展クライテリオンの検討 : 第1報,モードI負荷を受ける表面き裂のパリス則

概要

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Change of C value in Paris' law along crack front of surface crack is measured experimentally. It is necessary to predict the growth of surface crack by fatigue. It is shown that C value decreases near specimen surface. It coincides with previous literature. Crack closure effect is studied numerically for a surface crack by elastic-plastic cyclic analyses. It is found that closure effect appears more strongly near specimen surface than the maximum-depth point. By determining effective stress intensity factor including closure effect, it is shown that change of C value is equal to the change of closure effect along crack front. Using new C value considering closure effect, fatigue crack growth is predicted using S-FEM. It is shown that fatigue life and crack configuration agree well with experimental ones.
2010-04-25