Effect of stress concentration at weld toes on combined high and low cycle fatigue of EH36 steel welded joints

被引：0

作者：

Xu, Lianyong ^{[1
,2
]}

Long, Zhiping ^{[1
,2
]}

Zhao, Lei ^{[1
,2
]}

Han, Yongdian ^{[1
,2
]}

Peng, Chentao ^{[1
,2
]}

机构：

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

[2] Tianjin Key Laboratory of Advance Joining Technology, Tianjin University, Tianjin

来源：

Hanjie Xuebao/Transactions of the China Welding Institution | 2024年 / 45卷 / 07期

关键词：

combined high and low cycle fatigue; digital image correlation method; fatigue life prediction; S-N curve; stress concentration;

D O I：

10.12073/j.hjxb.20230619003

中图分类号：

学科分类号：

摘要：

In order to study the effect of stress concentration at the weld toes on combined high and low cycle fatigue (CCF) of EH36 steel welded joints for ship structure, CCF tests were carried out on EH36 steel double-sided butt joints with 20 mm thick and different weld profiles. The results show the extent of reduction in joint life subjected to CCF increased with increasing high stress ratio of high cycle fatigue; Based on the digital image correlation method, the higher the stress concentration coefficient at the weld toes, the lower the CCF life of the joints. The extent of reduction increased with increasing stress ratio of high cycle fatigue. Validation of the models based on experimental data shows that joints with high stress concentration coefficient have lower fatigue life and increased dispersion of life prediction results; The Palmgren-Miner model and Zhu model do not fully consider the CCF damage effect, which leads to dangerous prediction results of CCF life. The modified Zhu model fully considers the influence of CCF. There are few prediction data points that the predicted life is higher than the actual life.The prediction results are relatively safer. The dispersion and the error are smaller. © 2024 Harbin Research Institute of Welding. All rights reserved.

引用

页码：1 / 9

页数：8

共 32 条

[1]

Wang Y, Liu J, Hu J, Et al., Fatigue strength of EH36 steel welded joints and base material at low-temperature, International Journal of Fatigue, 142, (2021)

[2]

Song Y, Yang P, Xia T, Et al., The crack growth rate and crack opening displacement of EH-36 steel under low-cycle fatigue loading, Ocean Engineering, 280, (2023)

[3]

Li L, Jia Q, Wan Z, Et al., Experimental and numerical investigation of effects of residual stress and its release on fatigue strength of typical FPSO-unit welded joint, Ocean Engineering, 196, (2020)

[4]

Wang C, Wang S, Xie L, Et al., Fatigue crack growth behavior of marine steel under variable amplitude loading-combining DIC technique and SEM observation, International Journal of Fatigue, 170, (2023)

[5]

Ibarra M A C, Simao M L, Videiro P M, Et al., Long-term fatigue analysis of mooring lines considering wind-sea and swell waves using the Univariate Dimension-Reduction Method, Applied Ocean Research, 118, (2022)

[6]

Wei Guoqian, Chen Siwen, Yu Xi, Et al., Experimental and simulation study on multiple cracks of weld toe[J], Transactions of the China Welding Institution, 40, 11, (2019)

[7]

Luo Y, Ma R, Tsutsumi S., Parametric formulae for elastic stress concentration factor at the weld toe of distorted butt-welded joints, Materials, 13, 1, (2020)

[8]

Ottersbock M J, Leitner M, Stoschka M., Characterisation of actual weld geometry and stress concentration of butt welds exhibiting local undercuts, Engineering Structures, 240, (2021)

[9]

Zhang Chenxing, Study on the influence of weld morphology on weld strength, (2022)

[10]

Wu X, Kang H., A fracture mechanics-based stress approach for fatigue life prediction of welded joints considering weld profile effect, Theoretical and Applied Fracture Mechanics, 123, (2023)

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