Ⅰ型裂纹断裂韧性数值与理论计算比较分析

Comparative Analysis of Numerical and Theoretical Calculation of Fracture Toughness Model Ⅰ Fracture

通过对三种不同的材料进行三点弯实验,获得裂纹尖端附近的应力场,结合ANSYS数值模拟获得Ⅰ型裂纹的断裂韧度。将数值模拟获得的断裂韧度与理论分析获得的断裂韧度值进行比较研究,可以看出模拟获得的断裂韧度与理论值总体上比较吻合。模拟值比理论值稍微偏大,原因是数值分析时考虑了试件在加载受力时,裂纹尖端附近产生的应力集中,故得到的数值解比计算得出的理论解偏大。

The stress field near the crack tip was obtained by three-point bending experiments on three different materials,and then combined with ANSYS numerical simulation.the fracture toughness of I-type crack was gotten. When the two types of fracture toughness were compared,it could be seen that the fracture toughness by numerical simulation had a good agreement with the theoretical value, while the numerical value was a little bigger than the theoretical value because when the force was loaded on the specimen, stress concentration would appear near the crack tip.