Abstract
The paper describes the simulation of impact loads applied on plate panels with welding-induced residual stresses and deformation (WSD). Numerical simulations using FEM are carried out to study the influence of welding-induced residual stresses and deformation on the impact strength of plate panels. Welding is simulated using a three dimensional thermal mechanical coupled finite element method. The welding stress and deformation are taken as the initial imperfections in the impact strength analysis and their influence on the behavior of plate panels subjected to impact loadings. The impact loadings from the three directions, the lateral direction and two in-plane directions of the plate panels are studied. Results show a certain reduction in the impact strength due to the existence of welding stress and deformation in the plate panels. It is found that the reduction of impact force is strongly influenced by the welding deformation and the impact directions in the plate panels. This reduction is more significant when the impact force is in the lateral direction.
Highlights
The structural design of ships concerning grounding and collision requires an accurate prediction of the damage of plate panels under impact loading
The influence of welding induced residual stresses and deflections is taken into considerations for plate panels subjected to impact loadings
The paper summarizes the results from numerical simulations of plate panels subjected to in-plane and lateral impact loadings
Summary
The structural design of ships concerning grounding and collision requires an accurate prediction of the damage of plate panels under impact loading. (2016) Impact Strength Analysis of Plate Panels with Welding-Induced Residual Stress and Deformation. The majority of researchers have focused on deriving the resultant damage of the ship collisions via analytical, experimental, and finite element methods. The evaluation of impact strength of plate panels is based on the shape of initial welding imperfections and material properties with the consideration of the plastic strain. The influence of welding induced residual stresses and deflections is taken into considerations for plate panels subjected to impact loadings. The paper summarizes the results from numerical simulations of plate panels subjected to in-plane and lateral impact loadings. Results show a reduction in the impact strength due to the occurrence of initial welding imperfections in the plate panels. The nonlinear dynamic analysis should be compared with experimental scaled tests to verify the results
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