残余应力影响冷拉拔钢丝强度梯度的数值仿真  

Numerical simulation on influence of residual stress on strength gradient in cold drawn steel wire

作　　者：赵天章[1] 张士宏[2] 张凌云[1] 张光亮[3] 张帅[4] 

机构地区：[1]沈阳航空航天大学航空制造工艺数字化国防重点学科实验室,沈阳110136 [2]中国科学院金属研究所,沈阳110016 [3]台州学院机械工程学院,台州318000 [4]沈阳飞机工业(集团)有限公司,沈阳110000

出　　处：《塑性工程学报》2016年第5期96-102,共7页Journal of Plasticity Engineering

基　　金：国家自然科学基金资助项目(51404158);辽宁省博士科研启动联合基金项目(201601176)

摘　　要：针对通过剥离表面材料和后续单向拉伸试验得到的冷拉拔钢丝的局部强度沿半径方向分布不均匀,存在一定的强度梯度的问题,利用ABAQUS构建了二维轴对称的冷拉拔有限元模型,计算分析了拉拔后残余应力的分布规律。将数值结果赋予拉拔后续的单向拉伸模型,对比无残余应力的模型,残余应力的存在显著降低了钢丝的弹性模量和屈服强度,但对均匀硬化阶段影响较小。去除钢丝表面材料后残余应力会自平衡,但不会消失,导致后续单向拉伸行为明显不同。随着去除材料的增加,钢丝的弹性模量逐渐增加,而屈服强度不断降低。因此,残余应力的存在一定程度上增大了冷拉拔钢丝的强度梯度。For the problem that the partial tensile strength after removing surface of cold drawn steel wire varies with radius（called radial gradient of tensile strength）,a 2Daxisymmetric finite element model of cold drawing was established by using ABAQUS.The distribution of residual stress after drawing was analyzed.Then,the result was given to an uniaxial tension model.Compared to the one without considering residual stress,the elastic modulus and yielding stress of the cold drawn steel wire decrease obviously.However,there is little influence of residual stress on the uniform deformation stage.Cutting the surface leads to a rebalance of residual stress without disappearing.And then the mechanical behavior in uniaxial tension changes greatly.The elastic modulus increases and the yielding stress decreases with the increasing cutting part.To sum up,the residual stress makes the radial gradient of tensile strength intensive.

关 键 词：钢丝 拉拔 残余应力 数值模拟 强度梯度 

分 类 号：TG356.4[金属学及工艺—金属压力加工] TG356.11