一般应力比时焊接结构S－N曲线的预测方法

本文考虑了焊接结构的几何形状、受载形式、应力比、残余应力、尺寸效应以及材料等因素对疲劳寿命的影响，利用Ｐｅｔｅｒｓｏｎ公式和极值疲劳切口系数概念，建立了一般应力比时焊接结构Ｓ－Ｎ曲线的预估模型．文中对几类典型的焊接结构的Ｓ－Ｎ曲线进行了预测，预测值与实验结果符合较好．本文方法可以大量减少疲劳实验，具有一定的工程实用价值．

PREDICTING METHOD OF S-N CURVE FOR WELDED STRUCTURE UNDER GENERAL RATIO OF STRESSES

The effects of geometric shape. manner of loading, ratio of stresses, residual stress, thickness of plate and the material propenies of the welded structure on the fatigue lifeare considered respectively. By means of Peterson's formula and the concept of the worst fatigue notch factor, a model of prediction of S-N curve for welded structual under general ratio of stresses is developed, A few S-N curves of welded structures have been predicted.Good agreement between the estimations and the experiments is achieved. According to the method, the fatigue experiments may be reduced greatly. Therefore it has significance for engineering application.