基于有限元仿真的螺母表面残余应力分析

Analysis of residual stress on nut surface based on finite element simulation

针对现有螺母喷丸工艺中的单层弹丸或多层规则弹丸模型的不足,在ABAQUS有限元分析软件中建立了多层随机弹丸分布模型,使用该模型研究了弹丸层数、喷丸角度和喷丸速度对螺母表面残余应力的影响,并通过喷丸试验对多层随机弹丸模型进行验证。结果表明:多层随机弹丸分布模型下的仿真结果与试验结果基本符合,说明该模型是准确可靠的。喷丸后的螺母表面残余应力呈现压应力状态,最大压应力出现在螺母直段,最小残余压应力出现在螺母小圆弧部位。喷丸强化角度越大,螺母表面强化效果越好,表面残余应力数值越小,螺母表面残余压应力数值与喷丸角度呈正相关。

Aiming at the shortcomings of the single-layer or multi-layer regular projectile models used in the existing nut shot peening process,a multi-layer random projectile distribution model was established in the ABAQUS finite element analysis software.The effect of projectile layer number,shot peening angle and shot peening speed on the residual stress on nut surface was studied using the model,and the multi-layer random projectile model was verified by shot peening experiments.The results show that the simulation results under the multi-layer random projectile distribution model basically agree with the experimental results,indicating that the model is accurate and reliable.After the shot peening,the residual stress on nut surface shows a compressive stress state,the maximum compressive stress appears in the straight section of the nut,and the minimum residual compressive stress appears in the small arc portion of the nut.The larger the shot peening strengthening angle is,the better the surface strengthening effect of the nut is,the smaller the surface residual stress value is,and the value of the residual compressive stress on the nut surface is positively related to the shot peening angle.