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在ABAQUS有限元平台上建立模型,模拟在一对拉应力作用下裂纹扩展过程中裂纹前缘应力场的演化情况。结果表明:在加载过程中,由于裂纹端点附近材料发生软化,应力反而下降,导致裂纹前缘应力重新分布。垂直于裂纹延长线上的应力的最大值不是在裂纹端点而是出现在裂纹延长线上,且离端点有一定距离处。裂纹前缘的等效塑性应变(PEEQ)随载荷的增大而急剧上升,但是沿裂纹线的方向又下降。这说明材料损伤发生于裂纹前缘很小区域内,这并未影响到其他区域。
A model was built on the ABAQUS finite element platform to simulate the evolution of the stress field in the crack front during the crack propagation under a pair of tensile stresses. The results show that during the loading process, the stress decreases on the contrary due to the softening of the material near the crack tip, resulting in the redistribution of stress at the crack front. The maximum value of the stress perpendicular to the crack extension line is not at the crack end point but rather on the crack extension line and at a distance from the end point. The equivalent plastic strain (PEEQ) at the crack front increases sharply with the increase of load, but decreases along the crack line. This shows that material damage occurred in a small area of the crack front, which did not affect other areas.