Abstract:
Objectives This study investigates the effects of dents, initial welding deformation and residual stress on the ultimate strength of hull plates under cyclic loading.
Methods The ABAQUS software was utilized in conjunction with its secondary development capabilities to programmatically apply dents to hull plates. The modeling and simulation scenarios comprehensively integrated multiple factors, including welding residual stresses, material properties, and other parameters, to accurately represent practical conditions. Nonlinear finite element analysis was employed to investigate how varying dent dimensions affect the ultimate strength of hull plates with initial imperfections under elastic shakedown conditions.
Results The results indicate that welding residual stress have a significant impact. An increase in dent depth after elastic shakedown reduces residual stress release and intensifies the plastic deformation, leading to a decrease in ultimate strength. The aspect ratio of dents has a complex effect and is related to stress release.
Conclusions This study confirms that the release of welding residual stress and dent parameters under cyclic loading significantly affect the ultimate strength of dented hull plates. The findings provide a basis for hull structure strength assessment and offer practical guidance for hull structure design and optimization.
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