直交異方性體內 龜裂의 進展과 臨界應力에 관한 硏究
A Study on the Crack Extension and Critical Stress for a Crack in Orthotropic Materials
vii, 81 p.
직교이방성체내 균열 진전 임계응력;
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Recently, the non-singular term for elastic stress components at a inclined crack tip was derived in an orthotropic model with biaxial loads and the stress components were reanalyzed. the model was assumed elastic, homogeneous and anisotropic body. this problem was considerably more complicated than the isotropic case. In this study is concerned with prediction both direction of crack growth and critical stress at a crack tip for the conditions of orthotropic materials subjected to a biaxial loads. The objective of this work is to develop the capability to analyze the mixed-mode propagation of a crack and critical stress. Therefore, this paper is investigated propagation angle of a crack and critical stress by the various criteria using the biaxial loading ratio, non-singular stress component, crack inclined angle and near the crack tip distance Predictions for the angle of crack extensions and critical stress in orthotropic material based on the reformulated criteria of maximum tangential stress(MTS), strain energy density(SED), maximum tangential principal stress(MTPS), maximum tangential strain(MTSN) and critical strain energy density(CSE) are compared for angled slit cracks under biaxial tensile loading . Some difficulties associated with the application of these criteria are indicated.