基于ABAQUS的应力强度因子求解

Calculation of Stress Intensity Factor Based on ABAQUS

应力强度因子是断裂分析中的一个重要参数,准确有效地求解应力强度因子对于正确地评估结构的断裂强度至关重要.基于ABAQUS有限元软件,以非对称四点弯曲试样为例,在裂纹尖端区域设置奇异单元,通过J积分实现了应力强度因子的求解,并与解析法、外推法所得结果比较.计算结果表明,通过ABAQUS有限元软件计算应力强度因子是简单有效的,且计算精度较高.

Stress intensity factor is an important parameter in the fracture mechanics analysis, and it can accurately and efficiently be solved that is essential for a correct assessment of structural fracture strength. Based on ABAQUS finite element software, taking non-symmetrical four-point bend specimens as an example, the calculation of stress intensity factor is solved by setting singular elements at the crack tip and the J-integral. Compared with analytical method and extrapolation method, the results show that the calculation of the stress intensity factor is simpler and more effective, and higher accuracy though ABAQUS finite element software.