【摘要】 本文采用位移不连续数值方法 (DisplacementDiscontinuityMethod ,简称DDM)求解二维复合型裂纹在任意荷载条件下的断裂扩展问题。针对二维裂纹的破坏演化特征 ,建立了外荷载逐次增量及在最大拉应力准则下 ,沿裂纹扩展方向的单元自动追加的裂纹扩展动态过程的DDM跟踪方法。得到了单裂纹条件下的理论解及其与规则排列的双裂纹实验结果高度吻合的计算结构。该方法直接在裂纹体上划分单元 ,并且在裂纹演化过程中仅需在原有基础上追加单元 ,程序实现简单、单元数少 ,便于在微机上实现多裂纹的扩展模拟。更多还原

【Abstract】 In this paper the Displacement Discontinuity Method (DDM) was applied to solve the rupture propagation of two-dimensional combined crack under any load. According to the characteristics of damage progress of two-dimensional crack, the DDM tracking of dynamic process of crack propagation has been developed for external load increment and automatic unit addition along the direction of crack propagation under the criteria of maximum tensile stress. The calculation results for the theoretical solution of the single crack are coincident with the experiment ones for double cracks arranged regularly. The procedure is simple with fewer units and it is easy to simulate multiple crack propagation on the computer.更多还原