Abstract
Accumulated plastic damage caused by repeated ice impact sometimes will seriously affect the work performance and safety of ships and offshore structures. Therefore, it is of great significance to investigate the accumulated plastic damages of ship plates under repeated ice impacts. In this paper, the ice floes are simplified as ice wedge blocks, and the laboratory scaled repeated impact experiments between the rectangular plate and fresh water ice wedges were carried out. For each ice impact test, the permanent deflections of plates and time history of impact force were obtained. Besides, the related numerical simulations using LS-DYNA software are also conducted to study the elasto-plastic behaviours of plate under repeated ice impacts. The results from numerical simulations show good agreement with experimental results. Moreover, combined experimental and numerical methods, the accumulated plastic deflections, energy absorption of plates, and energy dissipation of ice damage during the ice impact process are investigated, which can provide useful information for structural design of ice-classed ships.
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