Fatigue assessment of thin plate welded joints based on zero-point effective notch stress

被引：0

作者：

Shu W. ^{[1
]}

Gao J. ^{[1
]}

Li H. ^{[1
]}

Deng C. ^{[2
]}

Liu Q. ^{[1
]}

Gong B. ^{[2
]}

机构：

[1] Offshore Oil Engineering Co., Ltd., Tianjin

[2] School of Materials Science and Engineering, Tianjin University, Tianjin

来源：

Hanjie Xuebao/Transactions of the China Welding Institution | / 45卷 / 06期

关键词：

fatigue assessment; welded joints; zero-point effective notch stress;

D O I：

10.12073/j.hjxb.20230731002

中图分类号：

TG4 [焊接、金属切割及金属粘接];

学科分类号：

080201 ; 080503 ;

摘要：

In this paper, the fatigue assessment of welded joints in thin plates was conducted using zero-point effective notch stress. This method comprehensively considered the influence of overall structural stress and the nonlinear stress peak at the root of the notch to the zero-point position. Based on the critical distance method and zero-point structural stress method, the zero-point stress position was taken as the critical distance for the fatigue assessment of welded structures. Through fitting the fatigue test results of two different types of welded joint specimens (T-type single-sided welded joint and lapped joint with different thickness combinations), the results showed that there were significant differences in the zero-point effective notch stress when evaluating specimens with different cross-sectional stress linearization at the weld root. Among them, the width of the scattered band of the SN curves obtained by linearizing the stress at the weld toe cross-section was the smallest. Furthermore, the difference of scattered bands between the S-N curves of considering for weld toe cross-section and weld root failure simultaneously and separately was not significant, proving that this method could be used simultaneously for fatigue assessment of both weld toe and weld root in welded joints. © 2024 Harbin Research Institute of Welding. All rights reserved.

引用

页码：121 / 128

页数：7

共 15 条

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