Quantitative analysis of fatigue service failure law of 5182 aluminium alloy clinched joints

SHI Ye; LEI Lei; YAN Ming; SONG Chunyu

doi:10.12073/j.hjxb.20231219005

TRANSACTIONS OF THE CHINA WELDING INSTITUTION > 2025 > 46(3): 75-81. > DOI: 10.12073/j.hjxb.20231219005

SHI Ye, LEI Lei, YAN Ming, SONG Chunyu. Quantitative analysis of fatigue service failure law of 5182 aluminium alloy clinched joints[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2025, 46(3): 75-81. DOI: 10.12073/j.hjxb.20231219005

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Quantitative analysis of fatigue service failure law of 5182 aluminium alloy clinched joints

School of Mechanical Engineering, Shenyang University of Technology, Shenyang, 110870, China

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Received Date: December 18, 2023
Available Online: February 06, 2025

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Abstract

Abstract

This study investigates 5182 aluminum alloy clinched joints during fatigue service. The natural frequency of joints was periodically monitored through alternating dynamic response-strength degradation tests. The residual static strength was measured throughout the fatigue service process. The failure mechanism of fatigue degradation was quantitatively analyzed using natural frequency variations and strength degeneration laws. A quantitative method for joint service failure was established based on a nonlinear residual strength theoretical model and cumulative damage model. The results demonstrate that the natural frequency curve undergoes a significant leftward shift during fatigue loading. As the service life increases, the natural frequency of the joint gradually decreases, and the residual strength of the joint also decreases. The trend of the natural frequency and residual strength with the number of fatigue cycles is roughly the same, and the curve is clearly divided into stages. Both show a decreasing process from gentle to sharp. Based on the two models, a theoretical formula for the fatigue strength degradation of clinched joints was derived. A residual strength prediction model for 5182 aluminum alloy clinched joints was further established, and it shows validated practical effectiveness.
- clinched joint,
- aluminium alloy,
- dynamic response,
- natural frequency,
- strength degradation

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References (24)

References

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Quantitative analysis of fatigue service failure law of 5182 aluminium alloy clinched joints