According to elastoplastic theory,the critical parameter of plastic deformation around thecenter-hole was obtained,as well as a correction method for the error produced by this deformation.

• 根据弹塑性理论分析了孔边屈服的条件，并据此得到了孔边屈服后应变释放系数的修正公式，使小孔释放法测量焊接残余应力的精度得到提高，并且扩大了应力值的测量范围。