基于主 S-N 曲线法的焊接接头疲劳强度评估程序开发及验证

打开文本图片集

中图分类号：TG407；TP391.99 文献标志码：B

Development and verification of fatigue strength evaluation program for welded joint based on master S-N curve method

ZHOU Rongkun，WANG Huajian，LI Ruihao，NIE Chunge（Zhan Tianyou Collge（CRRC College），Dalian Jiaotong University，Dalian ，Liaoning，China）

Abstract：To address the issues of high computational complexity and cumbersome procedures in assessing the fatigue life of welded structures using the structural stress method，an evaluation program based on the structural stress method is developed using the APP Designer module in MATLAB. According to three sets of welded joint data from relevant literature，the program is employed to perform structural stress calculations. The results are compared with those obtained from fe-safe software，showing a maximum relative error of only 1.48% . Four lap welded joints with different mesh sizes are used to compare the calculated results of structural stress， von MISES stress，and the first principal stress， thereby verifying the mesh-insensitive characteristic of structural stress calculations. The comparison between the program fatigue life results and test data further confirms the accuracy and reliability of the program.

Key words： structural stress; welded joint ; fatigue life ; master S N curve method ; mesh insensitivity

0 引言

焊接结构具有连接性能好、质量轻、易于加工和自动化生产效率高等优点，被广泛应用于各行各业，尤其是在复杂机械设备中，焊接技术承担了关键作用。（剩余6237字）