柱面零件喷丸强化残余应力场的数值模拟

为研究柱面零件喷丸强化残余应力场的分布规律,应用ABAQUS软件模拟了单粒球形弹丸冲击柱面曲线轮廓零件靶体过程。接触碰撞数值模拟采用动态接触对惩罚函数法,计算方法采用中心差分时间显式算法,模型加载模式采用弹丸速度加载,模拟获得了喷丸强化残余应力场和位移场的分布规律。柱面靶体喷丸时,靶体表面产生的周向残余压应力和轴向残余压应力不等,且表面周向残余压应力略小于表面轴向残余压应力;靶体上产生的最大周向残余压应力和最大轴向残余压应力出现在距靶体表面相同深度位置,但最大周向残余压应力略小于最大轴向残余压应力,而周向残余压应力层深度略大于轴向残余压应力层深度。

Numerical simulation of residual stress field of cylindrical parts formed by shot peening strengthening

Aimed at investigating the distribution law of residual stress field formed by shot peening strengthening,this paper is concerned with applying the ABAQUS software to simulate the process by which the single spherical projectile achieves impacts on the cylindrical parts target with curve profile.The process consists of the numerical simulation of the contact impact by using the dynamic contact of the penalty function method,the adoption of central differential time explicit algorithm,and the use of the model loading mode,the projectile velocity loading method.The results show that the stimulation produces the distribution law of residual stress field and displacement field of shot peening strengthening;subjecting cylindrical target to top shot peening results in the differences between the circumferential residual stress and the axial residual stress on the target surface,and the circumferential residual stress is slightly smaller than the axial residual stress.The results reveal that there occur both the maximum circumferential residual stress slightly smaller than the maximum axial residual stress and axial residual stress in the same depth position from the target surface,but the layer of circumferential residual compressive stress depth is bigger than the axial residual compressive stress depth.