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曲轴在工作过程中不断受到重复性冲击载荷的作用,轴颈圆角处容易因为疲劳破坏而产生裂纹,但曲轴从开始出现裂纹直至断裂仍有一定的寿命。运用ADAMS和ANSYS软件对曲轴进行了刚柔耦合的动力学分析,得到各个连杆轴颈上的载荷谱。在ANSYS中将得到的载荷谱加载到曲轴连杆轴颈上,将加载完的模型导入FRANC3DV6.0软件,设置初始裂纹,进行裂纹扩展计算并运用Pairs公式进行寿命预测。结果表明,当裂纹深度达到21.21mm时,应力强度因子达到材料的断裂韧性,曲轴发生折断;含裂纹曲轴从出现裂纹到折断过程中,剩余寿命为5.91×106次。
Crankshaft in the course of their work continue to be repeated impact load, the journal fillet prone to fatigue damage caused by cracks, but the crankshaft from the beginning until the fracture cracks have a certain life expectancy. Using ADAMS and ANSYS software, the crankshaft was subjected to the rigid-flexible coupling dynamics analysis, and the load spectrum of each connecting rod journal was obtained. The load spectrum obtained in ANSYS was loaded on crankshaft connecting rod journal, the loaded model was imported into FRANC3DV6.0 software, the initial crack was set, the crack growth calculation was carried out, and the life prediction was carried out by Pairs formula. The results show that when the depth of crack reaches 21.21mm, the stress intensity factor reaches the fracture toughness of the material and the crankshaft fractures. The residual life of the cracked crankshaft from crack initiation to fracture is 5.91 × 106 times.