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采用X射线应力分析仪对7050铝合金冲击强化后三个方向的残余应力进行了测量,并借助VHX-2000超景深三维显微系统对其表面形貌进行观察。结果表明,冲击1次,最大残余主应力变化较小,铝合金表面在激光加载区域形成了较深的凹坑,激光加载区域与边缘区域的高度差达13.88μm。冲击2、3、4次时,由于追赶卸载,材料表面拉应力与压应力分布不均匀,材料表面既有凸起,又有凹陷。
X-ray stress analyzer was used to measure the residual stress in 7050 aluminum alloy in three directions after impact-enhanced, and the surface morphology was observed by VHX-2000 three-dimensional microscopy. The results show that when the impact is applied for one time, the maximum residual principal stress changes little. The surface of the aluminum alloy forms deep pits in the laser loading area. The height difference between the laser loading area and the edge area reaches 13.88μm. Impact 2,3,4 times, due to catch-up unloading, tensile and compressive stress distribution on the surface of non-uniform material, both convex surface, but also depression.