摘要
为建立满足7055铝合金高速切削有限元模拟的本构模型,基于准静态拉伸实验和分离式霍普金森压杆(SHPB)动态冲击实验,采用变量分离和非线性拟合得出7055铝合金的初始Johnson-Cook(J-C)本构方程;结合高速铣削实验,基于Oxley切削模型的反求法对初始本构方程参数进行修正,建立7055航空用高强铝合金高温、大应变、高应变率材料本构模型。利用ABAQUS软件和获得的J-C本构方程建立7055高速切削有限元模型。有限元模拟的主切削力与实验结果相差较小,表明所建立的J-C本构方程能较好地应用于高速切削模拟。
In order to establish J-C constitutive model which can be used to simulate high speed cutting of 7055 aluminum alloy by finite element method,the initial J-C constitutive model of 7055 aluminum alloy was established based on quasi static tensile test and SHPB test by method of separation of variables and method of nonlinear fitting. The parameters of initial constitutive model were revised with high speed milling test results and reverse method based on Oxley cutting model. At the same time,the constitutive model for 7055 aluminum alloy of high temperature,large strain and high strain rate was built. In addition,the finite element model of high speed cutting of 7055 aluminum alloy was established by ABAQUS software and J-C constitutive model. The result shows the error between experimental value and simulated value by finite element method is small,which indicates the J-C constitutive model can be applied to the simulation of high speed cutting.
出处
《兵器材料科学与工程》
CAS
CSCD
北大核心
2015年第4期5-9,共5页
Ordnance Material Science and Engineering
基金
国家自然科学基金(51475162
51105139)
湖南省自然科学基金重点项目(14JJ5015)
关键词
7055铝合金
本构模型
有限元
切削
7055 aluminum alloy
constitutive model
finite element method
cutting
作者简介
刘文辉，男，博士，副教授；主要从事轻合金加工工艺与性能、材料损伤与断裂的研究，发表论文30余篇。E-mail：lwh@hnust．edu．cn
