金屬材料於平面應變下裂縫前端之彈塑性分析

• Main Authors: Yu, Chih-Kai, 游智凱
• Other Authors: Chiang, Chun-Ron
• Format: Others
• Language: zh-TW
• Published: 2006
• Online Access: http://ndltd.ncl.edu.tw/handle/50457683090238854953

碩士 === 國立清華大學 === 動力機械工程學系 === 94 === Crack tip plastic zone is a very important factor in the fracture behavior of metallic materials. To simulate the plastic deformation at the crack tip, the principle of fracture mechanics is implemented in finite element method (FEM) and ANSYS engineering analysis software. For a homogeneous and isotropic material under Mode-I loading and small scale yielding condition, we change its stress intensity factor (SIF) and material strain hardening rate (SHR) to obtain the stress-strain distribution of the crack tip. The material property depends on bilinear mechanics model and kinematics hardening rule. From the result of this study, plastic deformation has occurred and led it to a blunt crack tip. So the stress value at the crack tip is a finite value. Also different material strain hardening rate has strongly influence to its stress-strain distribution in the plastic zone.