【摘要】 本文应用一种修正的Dugdale窄带屈服模型对四组延性裂纹稳定扩展试验进行了分析。提出并运用一种实验——数值计算混合方法确定了大范围屈服情况下裂纹顶端附近的应力场,以此裂纹顶端应力场做为依据,按修正Dugdale窄带屈服模型处理裂纹顶端附近边界条件,用有限元方法分析了试件,计算出延性裂纹稳定扩展的判据J积分。定义了一个新的延性裂纹稳定扩展判据:裂纹嘴张开角(Crack Month Openning Angle CMOA)。更多还原

【Abstract】 A series of photoelastic specimcns on ductile fracture are analyzed with a Modified Dugdale Strip Yield Model. The stress field, determined by a hybrid experimental—numerical analysis method surrounding a ductile crack is used as a prescribed boundary condition for finite element analysis of the specimens. J—integral and Crack Mouth Openning Angle (CMOA) are obtained.更多还原