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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。
Aiming at the problem that the local strength of the cold-drawn steel wire obtained by peeling the surface material and the subsequent uniaxial tensile test is unevenly distributed along the radial direction, there is a certain intensity gradient problem. A two-dimensional axisymmetric cold drawn finite element Model, calculated and analyzed the distribution of residual stress after drawing. The numerical results are given to the subsequent uniaxial tensile model. Compared with the model without residual stress, the residual stress significantly reduces the elastic modulus and yield strength of the steel wire, but has little effect on the uniform hardening phase. After removal of the steel wire surface material residual stress will self-balance, but will not disappear, leading to follow-up unidirectional tensile behavior significantly different. As the removal of material increases, the elastic modulus of the steel gradually increases while the yield strength decreases. Therefore, the existence of residual stress increases the strength gradient of cold-drawn steel wire to a certain extent.