点蚀坑对表面裂纹的影响

Effect of Corrosion Pits on Surface Cracks

研究利用虚拟裂纹闭合法和通用有限元程序计算裂纹应变能释放率(G),通过数值解与埋藏圆片裂纹的解析解的对比分析验证了数值解的合理性.对点蚀与表面裂纹的结构进行有限元建模,并计算不同尺度点蚀下的裂纹应变能释放率,结果表明,当点蚀与表面裂纹的尺度相近时,点蚀会在一定程度上使得裂纹应变能释放率变小.

A general finite element procedure for obtaining strain energy release rates（ G） for crack growth in isotropic material is presented. The procedure was based on virtual crack closure method（ VCCM）. The formulae were evaluated by comparing with the analytical solutions of embedded circular crack. Simulated the corrosion pits and surface cracks,and computed strain energy release rates of different sizes. The result showed that the shape of pits decrease the G value when the sizes of them are similar.