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分析了大型机翼整体壁板在喷丸成形及强化过程中产生延展变形的机理,并介绍了几种喷丸成形数值模拟的方法;对于弹丸不重叠排布的情况,采用长方形和三角形两种喷丸覆盖率计算模型,对于弹丸随机排布发生重叠的情况下,采用Avrami覆盖率计算模型,通过多弹丸撞击长方体胞元的有限元模拟方法,得到弹丸撞击后靶材的表层诱导应力场的分布规律;进而采用直接应力法建立了预测喷丸成形及强化延展变形的有限元模拟方法,通过试板喷丸成形参数和试板弯曲及延展的变形规律的试验,验证了其有效性,进而将其应用于C919机翼下前整体壁板板坯延展量的模拟,取得了与试验吻合较好的结果。
The mechanism of ductile deformation in the process of shot peening and strengthening is analyzed, and several methods of numerical simulation of shot peening are introduced. In the case of projectile non-overlapping arrangement, two kinds of rectangular and triangular In the shot peening coverage calculation model, Avrami coverage calculation model was used to predict the surface induced stress field of the projectile after the projectile collided with the rectangular parallelepiped cell by the finite element simulation method. And then using the direct stress method to establish the finite element simulation method of predicting the shot peening and strengthening the extension deformation. Through the test of the shot peening parameters of the test plate and the deformation of the test plate bending and extending, the validity of the method is verified. The simulation of the extension of the slab under the C919 wing was carried out. The good agreement with the experimental results was obtained.