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本文提出用钻阶梯形孔法,测量沿板厚非均匀分布时的深层平面残余应力。本文分析了由于钻孔引起的附加应力的影响,并用有限元法计算了有关附加应力的影响的系数。文中由纯弯曲试验,验证了阶梯形孔法及附加应力系数计算的可靠性。认为只要满足垂直于板平面的应力可以不考虑的条件,用这方法测量沿板厚非均匀分布的平面残余应力是可行的。
This paper proposes to use the stepped hole drilling method to measure the deep plane residual stress when the plate thickness is non-uniformly distributed. This article analyzes the effect of additional stress caused by drilling, and uses the finite element method to calculate the coefficient of influence on the additional stress. The pure bending test in this paper verifies the reliability of the calculation of the stepped hole method and the additional stress coefficient. It is considered that it is feasible to use this method to measure the plane residual stress distributed non-uniformly along the plate thickness as long as the stress perpendicular to the plate plane can be satisfied without considering the conditions.