运用有限元软件ANSYS建立了孔挤压强化残余应力场的三维有限元模型,模拟计算了不同厚度7050-T7451铝合金构件孔挤压强化的三维残余应力场分布.模拟结果表明,孔边残余应力沿厚度方向呈梯度分布,人口残余压应力最小,是易于产生裂纹的部位;入口残余压应力随构件厚度增加而增大,达到最大值后,随厚度增加而减小并逐渐趋于稳定值.同时,使用x射线衍射应力分析技术测量了实际试样的残余应力,结果表明,入口表面的残余压应力明显小于出口表面,并且实验测量值与有限元模拟值吻合较好.
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