船首-冰层碰撞下的船体结构变形及损伤模式演化

Hull Structural Deformation and Damage Evolution under Bow-Ice Collision

基于非线性有限元方法模拟船首-冰层碰撞动态过程,从船体结构吸能、应力场分布、结构变形和损伤演化等角度研究不同碰撞场景下的船-冰相互作用响应特征,总结得到碰撞角度、碰撞部位和冰层厚度等因素对船首结构吸能、结构变形和损伤模式演化的影响机理。研究结果表明:在船-冰碰撞过程中,船体外板先发生变形,随后靠前的纵骨面板和腹板倾覆、断裂;随着撞击的深入,肋板倾覆,外板剧烈弯曲甚至损伤,外板为主要的吸能构件,甲板纵骨和甲板纵桁吸能最少。

Based on nonlinear finite element method,the dynamic processes of bow-ice collision are simulated.The features of the interaction between the ship and the ice under various collision scenarios are investigated from the perspectives of hull structure energy absorption,stress distribution,structural deformation,and damage mode evolution.The method through which variables including impact angle,collision position,and ice thickness affect the bow structure's energy absorption,structural deformation,and progression of damage modes is outlined.According to the research,the front longitudinal plate and the web plate are inverted and then shattered when the outer plate is initially distorted during the ship-ice collision.The outer plate is the main energy-absorbing member,and the deck longitudinals and deck girders are the least energy-absorbing.