金属构件的残余应力对其力学性能有重要影响。一般认为,压应力对提高构件的疲劳强度有益,拉应力则可能促使裂纹开裂、应力腐蚀和减少疲劳寿命而对构件产生不利影响。长期以来,残余应力的研究一直受到学术界和工业界的重视,准确测量残余应力非常重要。 The residual stress of metal components has important influence on its mechanical properties. Generally believed that the compressive stress to improve the fatigue strength of components useful, tensile stress may promote crack cracking, stress corrosion and reduce the fatigue life of the components have a negative impact. For a long time, the research of residual stress has been paid more attention by the academic and industrial circles. It is very important to measure the residual stress accurately.