【摘要】 在进行有限元仿真过程中,材料的J-C本构模型发挥着重要的作用。通过力学实验得出的J-C本构模型,往往需要修正才能更好地描述材料的物理力学性能。在对ZL109硅铝合金进行的有限元仿真的基础上,研究J-C本构模型参数的变化对于仿真结果的影响规律,从而为本构模型的研究提供参考性建议。仿真中所用ZL109硅铝合金采用随温度变化的物理力学性能参数,刀具选用目前应用广泛的PCD刀具。通过仿真数据发现:切削力、切削温度主要受J-C本构模型参数中温度软化系数m和应变强化系数B的影响;切屑形态和工件表面残余应力主要受J-C本构模型参数中屈服强度A、应变强化系数B和n的影响。更多还原

【Abstract】 The J-C constitutive model plays an important role in the finite element simulation.The J-C constitutive model obtained through mechanical experiments is often modified to better describe the physical and mechanical properties of materials.On the basis of the finite element simulation of ZL109 Si-Al alloy,the influence rule of the J-C constitutive parameters on the simulation results was studied,so as to provide reference for the research of constitutive model.The ZL109 Si-Al alloy used in the simulation adopts the physical and mechanical property parameters varying with temperature,and the tool adopts PCD which is widely used at present.Through simulation data,it was found that cutting force and cutting temperature were mainly affected by temperature softening coefficient m and strain strengthening coefficient B.Chip morphology and residual stress were mainly affected by strain strengthening coefficients A,B and n.更多还原