The present study describes a novel approach applying 3D digital image correlation to a hole drilling method to measure residual stresses. Measurements were performed on a friction stir-welded joint made of ultrafine-grained aluminum. The results show that severe plastic deformation did not significantly change the residual stresses, while in the weld’s stir zone they increased to 100 to 200 MPa. The obtained results demonstrate the reliability of the applied residual stress measurement method.

中文翻译：

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3D DIC辅助残余应力测量在超细粒铝摩擦搅拌焊中的应用

本研究描述了一种将3D数字图像相关性应用于钻孔方法以测量残余应力的新颖方法。在由超细晶粒铝制成的摩擦搅拌焊接接头上进行测量。结果表明，严重的塑性变形并没有显着改变残余应力，而在焊缝的搅拌区，残余应力增加到了100至200 MPa。所得结果证明了所应用残余应力测量方法的可靠性。