浮冰碰撞下船体板塑性动力响应预测方法

Prediction method for plastic dynamic response of hull plate subjected to ice floe impact

[目的]极地航行的船舶会遭受浮冰碰撞,在一些极端冰碰载荷作用下船体板会出现永久塑性变形,严重影响船舶的安全和工作性能,极大地增加了极地船舶的维修成本。因此,亟需提出浮冰碰撞下船体结构塑性动力响应的预测方法。[方法]针对简化的浮冰−船体板碰撞模型,基于冰体破坏能量分析方法和船体板塑性动力响应刚塑性理论方法,探讨冰体与船体板碰撞过程中的碰撞能量分享机制,提出冰体碰撞下船体板的塑性动力响应解析式,并对比解析结果与数值结果。[结果]结果显示,所提解析方法可靠,可以快速预报冰体碰撞下船体板的塑性变形值以及碰撞力。[结论]所做研究具有较大的工程应用价值。

[Objectives]Polar ships are often subjected to ice floe impact during navigation,particularly,hull plates may suffer permanent plastic deformation under extreme ice impact loads,affecting the safety and working performance of the ship,and greatly increasing the maintenance costs.Therefore,it is necessary to propose a method to predict the dynamic plastic response of hull structure under ice floe impact loads.[Methods]This paper analyzes the energy sharing mechanism of ice-hull interaction based on the energy analysis method and rigid-plastic theoretical method to predict the plastic dynamic response of hull plates.An analytical formula for the dynamic response of a hull plate under ice floe impact is proposed,and comparisons between the analytical and numerical results are made.[Results]The comparisons show that the presented analytical method is reliable,this simplified theoretical analysis method can provide designers with rapid pre-diction regarding the maximal plastic deformation and collision force of a hull plate under ice floe impact.[Conclusions]The research has giving it great significance for engineering applications.