界面端脆性开裂扩展的数值模拟

用有限元分析了简支梁下表面粘贴异质材料后粘贴材料性能及结合角对界面端附近应力分布的影响,在此基础上,分别应用最大切应力准则和最大周向拉应力准则对界面端开裂扩展进行了数值模拟.计算结果表明,粘贴材料的性能及结合角仅对界面端附近的应力数值有影响,而对其分布规律影响不大;界面端或者由最大切应力引起沿界面开裂扩展,或者由最大周向拉应力引起垂直于界面在梁内开裂扩展.

Numerical simulation of brittle crack growth of the interface edge of bonded materials

The effect of the behavior of the dissimilar materials bonded at the lower edge of a simple-supported beam as well as that of the bonded angles on the stress distribution near the interface edge is studied by the FEM.Then the crack growth of the interface edge are simulated numerically based on the maximum shear stress criterion and the maximum circumferential tensile stress criterion.The results show that the behavior of the bonded materials and the bonded angles only affect the stress values,but has little effect on the stress distribution,and that the crack growth may develop along the interface under the maximum shear stress or in the direction perpendicular to the interface into the beam under the maximum circumferential tensile stress.