常规断裂韧性测试与有限元仿真综合实验设计

Integrated experimental design of conventional fracture toughness testing and finite element simulation

该综合性实验设计,明确了材料、裂纹缺陷尺寸等参数对断裂韧性测试值的影响规律,再现了实验测试过程中的裂纹扩展过程。实验结果显示,脆性特征明显的材料,其断裂韧性值相对较小;断裂韧性测试值随初始裂纹长度的增加而逐渐减小;平面应变状态的测试值最大,三维应力状态的测试值次之,平面应力状态下的测试值最小。通过该综合性实验的开展,学生能够直观观察裂纹的扩展过程,较好地掌握断裂韧性计算的基本理论,有助于激发学生的创新潜能,培养解决复杂工程问题的能力。

Based on the integrated experimental design of the fracture toughness testing and finite element simulation,the effect of material,crack defect size and other parameters on the measured fracture toughness are investigated and clarified,and the crack growth process in the test process of the material is reproduced.The results show that the fracture toughness of materials with obvious brittleness is relatively small.The testing value of fracture toughness decreases gradually with the increasing of initial crack length.The test value of plane strain state is the largest,followed by that of three-dimensional stress state,and that of plane stress state is the smallest.Through the integrated experiment designing and application,the students can visualize the crack growth process of the specimen,and it can better grasp the basic theory of fracture toughness calculation,stimulate students’innovation potential,and cultivate students'ability to solve complex engineering problems.