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根据喷丸强化工艺过程的特点,利用ABAQUS有限元计算软件建立了模拟喷丸残余应力场的三维有限元模型.在此模型基础上研究了喷丸速度、弹丸直径及弹丸数量等因素对铝锂合金喷丸残余应力场的影响规律,进而对比了单弹丸模型、均布式阵列弹丸模型和随机弹丸模型下残余应力场的分布规律.采用X射线残余应力仪和电解抛光法得到喷丸强化后沿铝锂合金试件厚度方向的残余应力分布规律.残余应力层深度约为0.24mm,最大残余应力出现在距表面深度为0.08mm处,验证了有限元模型的有效性.
According to the characteristics of shot peening process, a three-dimensional finite element model of simulated residual stress field of shot peening was set up by using ABAQUS finite element software.The effects of shot peening velocity, projectile diameter and projectile number on the mechanical properties of Al-Li Alloy shot peening residual stress field of the law, and then compared the single-shot ballistic model, uniform array of projectile model and random projectile model of residual stress field distribution.Using X-ray residual stress meter and electrolytic polishing method to obtain shot peening The distribution of residual stress along the thickness direction of the Al-Li alloy specimen shows that the depth of the residual stress layer is about 0.24mm and the maximum residual stress is 0.08mm from the surface, which verifies the effectiveness of the finite element model.