基于Derradji-Aouat海冰本构模型的船冰碰撞数值模拟

Numerical Simulation of Interaction between Icebreakers and Ice Based on Derradji-Aouat Ice Constitutive Model

海冰与结构物发生碰撞的过程中,其力学行为变化多样,基于实验数据建立的Derradji-Aouat海冰本构模型在一定程度上考虑了海冰的拉压强度不同、静水压力项、横观各向异性以及应变率效应等因素的影响,比传统的材料屈服理论有较好的适用性。采用非线性有限元法对船冰碰撞过程进行了数值模拟,并且对破冰船局部强度和总纵强度进行了校核。

The ice mechanical characters have varieties and diversities in the interaction between icebreakers and ice.Based on the experimental data,Derradji-Aouat constitutive model takes several aspects into consideration to some extent,like different SD effect,hydrostatic pressure,anisotropy,strain rate effect and etc.So it is better than the traditional yield theory when applied on the numerical simulation of icebreakers.A numerical method was proposed to predict the interaction between the icebreaker and ice by means of the nonlinear finite element method.Local and longitudinal strength of the icebreaker was checked.