Journal
OCEAN ENGINEERING
Volume 234, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.oceaneng.2021.109239
Keywords
Laser-welded stiffened plate; Ultimate strength; DIC; Ductile damage; Thermal-mechanical analysis
Funding
- National Key Research and Development Program [2019YFA0706803]
- National Natural Science Foundation of China [11772081, 12002078, 11972106, 11635004]
- Fundamental Research Funds for the Central Universities of China [DUT2019TD37, DUT18ZD209]
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The ultimate strength and failure modes of laser-welded Al-Li alloy stiffened plates were experimentally and numerically analyzed in this study. The results show that the established finite element model considering welding deformation and residual stresses can accurately predict the performance of stiffened plates.
The ultimate strength of laser-welded Al-Li alloy stiffened plates is experimentally and numerically analyzed in this study. The ultimate strength, failure mode, and strain evolution process of stiffened plates were measured through tension experiments combined with digital image correlation (DIC) and electrical measurements. Then, based on the established finite element model (FEM) considering material nonlinearity, geometry nonlinearity and ductile damage, the ultimate strength and failure mode of stiffened plates were simulated; and the influence of welding deformation and residual stress was investigated. The weld morphology, measured by metallographic experiment, validated the thermal-elastic-plastic model for predicting welding deformation and residual stresses. The results showed that the FEM considering welding deformation and residual stresses can accurately predict the failure modes and ultimate strength of stiffened plates.
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