ABSTRACT
While in service, marine structures can be progressively damaged due to repeated mass impacts arising from contacts between ships, ice floes, and other objects. This paper aims to predict the residual deformation evolution of marine structures under such repeated impacts. The side hull structures of the general ice-class vessels were selected for this study. The numerical model was developed using the finite element analysis software ABAQUS/Explicit. In the calculations, the strain hardening of the relevant ice-class steel grade was adopted using the proposed equations, and the strain-rate effect was also taken into account. The developed numerical analysis model was then validated by comparing with test data. Based on the validated model, a parametric study on various plates with actual scantlings was performed. The effects of the key parameters on the deformation of the repeatedly impacted plates were investigated. A simple yet accurate formula for prediction of the residual deflection evolution of plates under repeated mass impacts was proposed.
