基于LS-DYNA的冰材料模型二次开发及重叠冰应用

Secondary development of ice material model based on LS-DYNAand application of overlapping ice

利用LS-DYNA材料库开发了一种适用于极地海冰的材料模型,该模型基于粘弹-塑性本构关系,采用Drucker-Prager模型作为海冰的屈服准则,同时可计及应变率对海冰材料失效的影响.通过圆台型冰破坏的仿真计算,验证了该材料模型的合理性;将模型用于重叠冰单轴压缩破坏的模拟,结果表明数值模拟的重叠冰破坏现象及冰载荷均与试验结果吻合良好,该模型可用于重叠冰的模拟.

A material model suitable for polar sea ice is developed by using LS-DYNA material library.The model is based on the viscoelastic plastic constitutive relationship and Drucker Prager model is adopted as the yielding criterion of sea ice,and the effect of strain rate on the failure of sea ice material can be taken into account.The rationality of the material model is verified by the simulation calculation of cone ice failure;the model is further used to simulate the uniaxial compression failure of overlapping ice.The results show that the numerical simulation of overlapping ice failure phenomenon and ice load are in good agreement with the experimental results.The model can be used to simulate overlapping ice.