摘要
建立了AISI 4340微细侧铣的二维有限元模型。将Johnson-Cook本构模型与JohnsonCook剪切失效模型相结合,对铣削刃旋转过程中的一个完整侧铣周期进行了仿真。由于没有考虑尺寸效应的影响,所得到的流动应力值偏小。因此,建立了应变梯度塑性模型,并应用其预测了切屑的形成、冯米斯应力和温度场。仿真结果显示:微细侧铣过程中存在尺度效应,与Johnson-Cook本构模型相比,应变梯度塑性模型能够很好地描述微细侧铣过程中的尺寸效应。最后,将仿真结果与理论计算结果相比较,验证了所建模型的正确性。
This paper presented a 2D finite element model of AISI 4340 for micro side cutting. Johnson-Cook constitutive model and Johnson-Cook shear failure model are combined to simulate a complete side cutting cycle for one flute rotation. The flow stress which is calculated from Johnson-Cook constitutive model is smaller if the size effect is neglected. Therefore,the strain gradient plasticity model is developed. The chip formation,von Mises stress and temperature fields are predicted. Compare to the Johnson-Cook constitutive model,simulation results show that size effect exists in the micro side cutting process and the strain gradient plasticity model can describe it well. Finally,the flow stress from the finite element simulation is compared with theoretical calculation results,which is validated the correctness of finite element model.
出处
《机床与液压》
北大核心
2015年第24期80-83,共4页
Machine Tool & Hydraulics
基金
supported by Chongqing Research Program of Basic Research and Frontier Technology (No.cstc2013jcyj A70004)
Scientific and Technological Research Program of Chongqing Municipal Education Commission (No.KJ1501314 )
Chongqing University of Science & Technology (No.CK2014Z27)
