JZUS - Journal of Zhejiang University SCIENCE

Journal of Zhejiang University SCIENCE A

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Effect of varying strain rates on the local mechanical properties of aluminum alloy welded joints

Author(s): Chen LIU^1, Yansong WANG^1, Chenmeng WANG^1, ², Hu Zhou¹, Yuchen YANG^1, ³, Bangping GU¹, Shibin SUN¹, Long PAN⁴, Feilong LIU⁵, Guanhua XU^6, ⁷, Chuanxiao YANG¹
Affiliation(s): ¹Logistics Engineering College, Shanghai Maritime University, Shanghai 201306, China ²College of Mechanical Engineering, Donghua University, Shanghai 201620, China ³School of Mechanical and Power Engineering, East China University of Science and Technology, Shanghai 200237, China ⁴School of Mechanical Engineering, Nanjing Institute of Technology, Nanjing 211167, China ⁵School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China ⁶State Key Laboratory of Fluid Power and Mechatronic Systems, School of Mechanical Engineering, Zhejiang University, Hangzhou 310058, China ⁷Zhejiang Key Laboratory of Additive Manufacturing Technology and Equipment, School of Mechanical Engineering, Zhejiang University, Hangzhou 310058, China
Corresponding email(s): Bangping GU, bpgu@shmtu.edu.cn Guanhua XU, xuguanhua@zju.edu.cn
Key Words: AA5052 aluminum alloy; Digital image correlation; ABAQUS; Tensile properties

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Chen LIU^1*, Yansong WANG^1*, Chenmeng WANG^1,², Hu Zhou¹, Yuchen YANG^1,³, Bangping GU¹, Shibin SUN¹, Long PAN⁴, Feilong LIU⁵, Guanhua XU^6,⁷, Chuanxiao YANG¹. Effect of varying strain rates on the local mechanical properties of aluminum alloy welded joints[J]. Journal of Zhejiang University Science A,in press.Frontiers of Information Technology & Electronic Engineering,in press.https://doi.org/10.1631/jzus.A2500370

@article{title="Effect of varying strain rates on the local mechanical properties of aluminum alloy welded joints",
author="Chen LIU^1*, Yansong WANG^1*, Chenmeng WANG^1,², Hu Zhou¹, Yuchen YANG^1,³, Bangping GU¹, Shibin SUN¹, Long PAN⁴, Feilong LIU⁵, Guanhua XU^6,⁷, Chuanxiao YANG¹",
journal="Journal of Zhejiang University Science A",
year="in press",
publisher="Zhejiang University Press & Springer",
doi="https://doi.org/10.1631/jzus.A2500370"
}

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%T Effect of varying strain rates on the local mechanical properties of aluminum alloy welded joints
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%A Yansong WANG^1*
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doi="https://doi.org/10.1631/jzus.A2500370"

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doi="https://doi.org/10.1631/jzus.A2500370"

Abstract
Chinese Summary
Academic Network
Reviewer Comment

Abstract: Synchronized stretching in conjunction with digital image correlation (DIC) was employed to obtain stress-strain curves for multiple local regions of welded joints at varying strain rates. The material intrinsic damage model for each region was then fitted using the Ramberg-Osgood equation. As such, we investigated the effects of loads with different strain rates on welded members. The microstructural distribution laws in the local regions were elucidated using scanning electron microscopy (SEM) and optical metallurgical microscopy. Moreover, residual stress concentrations were revealed by employing multi-physics field simulations during the welding process, as well as by using the DIC method for full-field strain measurements. The results demonstrate that tensile specimens with varying strain rates exhibit ductile fracturing, and differ in strength and microhardness. The minimum strain-rate tensile strength recorded was 209.727 MPa, with an average microhardness of 72.66 HV0.3. Through simulations, it was further demonstrated that residual stresses and the softening zone cooperate during dynamic loading, resulting in preferential strain concentration. This study elucidates the mechanism by which the strain rate influences the mechanical properties of welded joints and the evolution of local mechanical behavior. It provides theoretical support and technical assurance for safe design and performance enhancement of aluminum alloy welded structures.

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