基于FRANC3D的轮轨疲劳裂纹扩展研究

Research on Fatigue Crack Growth of Wheel and Rail Based on FRANC3D

用有限元软件ABAQUS结合三维断裂力学软件FRANC3D,建立了轮轨裂纹三维有限元模型,依据断裂力学原理对含有裂纹的轮轨模型进行数值模拟,分析了不同工况下的车轮裂纹扩展行为。结果表明,在裂纹的中间段,裂纹扩展速率随着裂纹长度的增大有“先快后慢”的现象,两端段反之;裂纹角为30°时的裂纹尖端应力强度因子(SIF)最大,裂纹更容易扩展;裂纹尖端应力强度因子随着轴重几乎呈线性增加;裂纹深度的增加,应力强度因子先增大,后逐渐减小,且处于接触斑附近的裂纹更容易扩展。

Using the finite element softwareABAQUS combined with the three-dimensional fracture mechanics software FRANC3D,a three-dimensional finite element model of the wheel and rail crack was established. Based on the fracture mechanics principle,the wheel and rail model with cracks was numerically simulated,and the wheel crack propagation behavior under different working conditions was analyzed. The results show that,in the middle section of the crack,the crack growth rate has the phenomenon of“fast first and then slow”with the increase of the crack length,and the opposite ends;The crack tip stress intensity factor is the largest when the crack angle is 30,and the crack is easier to propagate;The stress intensity factor at the crack tip increases linearly with the axis load;the crack intensity increases first,then decreases gradually,and the crack near the contact spot is more likely to expand.