Life Prediction Method of Dissimilar Lightweight Materials Welded Joints with Precrack under Coupled Impact-Fatigue Loading

This paper aims to explore the fatigue life estimation approach of welded joints with precrack under coupled impact and fatigue loading, and the base metal is dissimilar 5083H111 and 5754 aluminum alloy. Impact tests are first carried out on the dissimilar lightweight materials welded joint with pre...

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Bibliographic Details
Published in:Materials 2022-07, Vol.15 (14), p.5077
Main Authors: Ni, Zhengshun, Xiong, Tao, Lei, Jie, Wang, Liuping, Gao, Tong, Yu, Jianwu, Mi, Chengji
Format: Article
Language:English
Subjects:
Aluminum base alloys
Base metal
Continuum damage mechanics
Damage assessment
Deformation
Dissimilar materials
Dissimilar metals
Fatigue failure
Fatigue life
Finite element method
Impact damage
Impact tests
Joining
Life expectancy
Life prediction
Lightweight
Mechanical properties
Metal fatigue
Numerical analysis
S N diagrams
Simulation
Welded joints
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Summary:This paper aims to explore the fatigue life estimation approach of welded joints with precrack under coupled impact and fatigue loading, and the base metal is dissimilar 5083H111 and 5754 aluminum alloy. Impact tests are first carried out on the dissimilar lightweight materials welded joint with precrack located in the middle of the specimen, and a stress and strain field is obtained to determine the fatigue damage model parameters by using finite element dynamic analysis to simulate the impact process. Based, on the S-N curve of welded joints, the predicted life expectancy is found to be inconsistent with the experimental results. According to the continuum damage mechanics, the lifetime assessment model is presented to calculate both impact and fatigue damage. The estimated results agree well with the experimental ones.
ISSN:1996-1944
1996-1944
DOI:10.3390/ma15145077