基于ABAQUS和FRANC3D的铝合金裂纹扩展试验研究

Experimental Research on Crack Propagation of Aluminum Alloy Based on ABAQUS and FRANC3D

摘要: 本文以铝合金试样作为研究对象，采用有限元仿真软件ABAQUS与裂纹扩展软件FRANC3D相结合的方法，进行铝合金的疲劳裂纹扩展试验仿真。首先，通过疲劳裂纹扩展试验及光学显微镜的裂纹形貌研究，获得疲劳裂纹扩展次数及裂纹扩展形貌；其次在有限元仿真平台ABAQUS中建立试验静力学模型；最后基于裂纹扩展软件FRANC3D预制初始裂纹，采用奇异性网格划分，并采用最大周向力准则进行裂纹扩展仿真，以及借助Paris公式计算剩余寿命。结果发现：基于ABAQUS和FRANC3D的铝合金裂纹扩展试验仿真与现实裂纹扩展试验结果有很好的一致性；并通过计算应力强度因子判别此裂纹扩展为I型(张开型)裂纹，从而得到裂纹更清晰有效的演化过程。

Abstract: Taking aluminum alloy specimens as the research object, the method of combining the finite ele-ment simulation software ABAQUS and the crack growth software FRANC3D is used to simulate the fatigue crack growth test of the aluminum alloy. First, the fatigue crack growth test and optical mi-croscope crack morphology research are conducted to obtain fatigue crack growth times and crack growth morphology; secondly, the experimental static model is established in the finite element simulation platform ABAQUS; finally, the initial crack is prefabricated based on the crack growth software FRANC3D, using singularity grid division, using the maximum circumferential force criterion for crack propagation simulation, and calculating the remaining life with the aid of the Paris formula. The results found that: the aluminum alloy crack growth test simulation based on ABAQUS and FRANC3D is in good agreement with the actual crack growth test results; and the crack growth is judged to be a type I (open type) crack by calculating the stress intensity factor, so as to obtain a clearer and more effective evolution process of the crack.