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Fatigue life prediction based on crack closure for 6156 Al-alloy laser welded joints under variable amplitude loading |
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| Affiliation: | 1. College of Mechanical Engineering and Applied Electronics Technology, Beijing University of Technology, Beijing 100124, China;2. Beijing Institute of Aeronautical Materials, Beijing 100095, China;1. College of Materials Science and Engineering, Chongqing University, Chongqing 400044, China;2. National Engineering Research Center for Magnesium Alloys, Chongqing University, Chongqing 400044, China |
| Abstract: | A fatigue prediction approach is proposed using fracture mechanics for laser beam welded Al-alloy joints under stationary variable amplitude loading. The proposed approach was based on the constant crack open stress intensity factor in each loading block for stationary variable amplitude loading. The influence of welding residual stress on fatigue life under stationary variable amplitude was taken into account by the change of crack open stress intensity factor in each loading block. The residual stress relaxation coefficient β = 0.5 was proposed to consider the residual stress relaxation for the laser beam welded Al-alloy joints during the fatigue crack growth process. Fatigue life prediction results showed that a very good agreement between experimental and estimated results was obtained. |
| Keywords: | Fatigue crack growth Life prediction Variable amplitude loading Crack closure Residual stress |
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