一般应力比时焊接节点的疲劳强度估算方法

An Estimating Method of Fatigue Strength of Welded Joint Under General Ratio of Stresses

考虑了焊接节点的几何形式、受载形式、材料、应力比、残余应力、板厚以及焊趾根部的短裂纹等因素对疲劳强度的影响。利用Ｐｅｔｅｒｓｏｎ公式和Ｔｏｐｐｅｒ公式，在引入极值疲劳切口系数概念的基础上，建立了一般应力比时焊接节点的两个有效应力集中系数估算公式，理论计算与实验结果的比较表明：用该方法预测焊接节点的有效应力集中系数有较好的准确度。

The effects of geometric shape, loading, material, ratio of stresses, residual stress, depth of plate and short crack in notch root of welded joint on fatigue strength are considered separately in the paper. By means of Petersons formula and Toppers formula, the concept of effective stress concentration factor of welded joint are established. It is shown that the methods have high accuracy under general ratio of stresses for predicting effective stress concentrtion factor of welded joint from theoretical calculation and experiment. This reserach will give an effective analysis method for engineering application.