Effect of saturation peening on shape and residual stress distribution after peen forming
Effect of saturation peening on shape and residual stress distribution after peen forming
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DOI：
10.1007/s00170-021-08473-6
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发表时间：
2022-01-13
影响因子：
3.4
通讯作者：
Sato, Yoshihiro
中科院分区：
文献类型：
--
作者：
Ohta, Takahiro;Sato, Yoshihiro
喷丸成形是一种无模成形方法，已应用于飞机机翼和火箭油箱;当用多个钢球以小于100%的覆盖率进行喷丸时，金属板的表面因塑性应变而凸出变形。为了在板的整个表面上引入均匀的压缩残余应力，可以在100%或更大的覆盖率下进行额外的饱和喷丸，这与喷丸成形不同。采用动态显式和静态隐式有限元法研究了饱和喷丸后的变形和残余应力分布的变化。有限元分析结果得到了实验验证。饱和喷丸过程中引入的塑性应变受喷丸成形表面上的塑性应变和喷丸成形后的压缩残余应力以及背面上的喷丸成形后的弯矩产生的压缩残余应力的影响。双面饱和喷丸对曲率没有影响，提高了近表面的残余压应力。
Peen forming is a die-less forming method that has been applied to aircraft wings and rocket tanks; the surface of a metal plate is deformed convexly by plastic strain when it is peened with multiple steel balls at less than 100% coverage. To introduce uniform compressive residual stress over the entire surface of the plate, additional saturation peening may be performed at 100% or more coverage, unlike peen forming. Changes in deformation and residual stress distribution owing to saturation peening after peen forming were investigated by dynamic explicit and static implicit finite element method (FEM). The FEM results were validated experimentally. The plastic strain introduced during saturation peening was affected by the plastic strain and compressive residual stress after peen forming on the peen-forming surface and by the compressive residual stress generated by the bending moment after peen forming on the back surface. The application of double-sided saturation peening had no effect on curvature and improved the compressive residual stress near the surface.