基于均匀设计的喷丸指标响应面模型建立及应用

Establishment and application of response surface model for shot peening index based on uniform design

针对2024-T351铝合金试验件,利用直径Φ3.18 mm大尺寸弹丸,选取喷丸气压、进给速度及弹丸流量3个重要喷丸工艺参数,通过设计均匀试验并运用MATLAB软件对喷丸试验结果进行逐步回归分析,建立弹坑直径、弹丸速度和覆盖率3项喷丸指标与喷丸工艺参数间的二阶响应面模型。利用该模型并结合多弹丸撞击有限元模型获得相应喷丸工艺参数下的平均诱导应力场,从而实现喷丸成形应力场法数值模拟。模拟变形结果与试验变形结果对比表明模拟值均小于相应试验值,最大误差14.8%,平均误差9%,二者符合较好,表明基于喷丸指标响应面模型的应力场法数值模拟方法完全可以应用于喷丸成形数值模拟分析。

Three factors including the shot peening air pressure,feed rate and mass flow were selected to design a uniform test for 2024-T351 aluminum alloy workpieces using the large-scale shot with diameter ofΦ3.18 mm.The MATLAB software was used to carry out stepwise regression analysis of the shot peening test results.The second-order response surface model were established between the three shot peening indexes of crater diameter,shot speed and surface coverage and the shot peening process parameters.The average induced stress field under the corresponding shot peening parameters was obtained using the response surface model and combining the multi-shot impact finite element model,then the numerical simulation of the shot peening stress field method was realized.The comparison between numerical simulation results of shot peening based on this model and experimental results shows that the simulated values are smaller than the corresponding experimental values,the maximum error and average error are 14.8%and 9%,respectively.The simulation results are in good agreement with the experimental results,indicating that the stress field method based on the response surface model can be applied to the numerical simulation analysis of shot peen forming.