金属棒料剪切的数值模拟分析

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金属剪切是一种复杂的弹塑性大变形过程,且存在多重非线性。文中选用最强大的非线性分析软件ABAQUS,以Johnson-cook作为材料的本构模型和断裂准则,并采用ALE自适应网格划分方法对金属棒料剪切断裂过程进行数值模拟。得出了剪切过程中应力应变分布及发展趋势,裂纹的生成、扩展,棒料的断裂过程和剪切力的大小、变化规律曲线。通过理论方法推导出剪切力计算公式,将最大剪切力与计算机模拟结果进行比较,验证了模拟结果是正确的。从而说明可以用数值模拟指导实际生产,为剪切机的优化设计、刀具材料形状的选择提供方法。

Metal shearing is a complex elastic-plastic large deformation process and includes multiple nonlinear problem. The powerful nonlinear analysis software of ABAQUS was selected. By using Johnson-cook as materials constitutive model and fracture criterion, the ALE adaptive meshing function is applied to simulate the bar shear fracture process. Distribution and development of stress and strain, crack formation and growth, fracture process of the bar and graph about shear force are achieved during the shearing process. The formula of shear force is deduced through the theoretical approach, and the results between the numerical simulation and theoretical calculation of max shear force are compared, simulation result as verified correct. The simulation results can provide solutions to the optimization design of shear machine and choice about tool materials or shape.

剪切，断裂，数值模拟，弹塑性有限元，shear，fracture，numerical simulation，elastic-plastic finite method。

金属棒料剪切的数值模拟分析。