Effect of Biaxial Tensile Loading on Fatigue Failure Behavior of 20 mm-thick T-type Welded Joints

doi:10.3901/JME.260403

Abstract

Abstract: T-type welded joints are widely used in marine structures and subjected to biaxial loading during service. Welding-induced defects and residual stresses make these joints weak points in equipment. By applying biaxial tensile loads to T-type welded joints and combining finite element analysis with strain measurements, this study investigates failure behaviors including stress states at weld toes, crack initiation locations, and propagation directions under biaxial loading. The results show that:Stress always concentrates at the lower weld toe of T-joints regardless of biaxial loading modes, and cracks first initiate and propagate at the lower weld toe. The crack propagation direction is $\theta=\arctan \left(d_1 / d_2 \cdot \sigma_Z \sin ^2 \alpha\right) /\left(d_1 / d_2 \cdot \sigma_Z \sin \alpha \cos \alpha+\sigma_H\right)$.The biaxial stress increment ratio of T-joints is approximately 3∶1. Based on this, the load magnitudes on base plates and vertical plates of T-joint structures can be adjusted to achieve lightweight design.

Key words: T-type welded joint, multiaxial fatigue, crack propagation direction, stress state

CLC Number:

TG47
TG115

YI Zhulin, MA Jiangnan, WU Zepeng, Luo Xianfu, Wang Zezheng. Effect of Biaxial Tensile Loading on Fatigue Failure Behavior of 20 mm-thick T-type Welded Joints[J]. Journal of Mechanical Engineering, 2026, 62(14): 220-230.

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URL: http://www.cjmenet.com.cn/EN/10.3901/JME.260403

http://www.cjmenet.com.cn/EN/Y2026/V62/I14/220

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