考虑初始缺陷的平整冰-锥体结构碰撞数值模拟

基于非线性有限元数值方法,对含初始缺陷的平整冰与锥体结构碰撞场景进行了模拟。将标记为初始缺陷的实体冰单元从平整冰模型中删除,并将黏聚单元插入到实体冰单元之间。在实尺度下对平整冰与锥体碰撞场景进行了数值模拟,分析了平整冰的断裂破坏模式并预报了锥体所受冰载荷,并将数值模拟结果与不考虑初始缺陷的数值模拟结果进行了比较。分别分析了初始缺陷分布位置和含量对锥体所受冰载荷的影响。结果表明,初始缺陷对于平整冰的断裂破坏模式和冰载荷均有重要的影响。

Numerical simulation of level ice-conical structure collision considering initial defects in ice

Based on the nonlinear finite element method,the collision between level ice and a conical structure was simulated considering initial defects in ice.First,the ice bulk elements labeled as“with initial defects”were deleted from the ice model,and cohesive elements were inserted in between the ice bulk elements.Then,the scenario of collision between level ice and the conical structure was simulated in full scale.The fracture failure mode of level ice and the ice loads on the conical structure were analyzed,and compared with the simulated results without considering initial defects in ice.Finally,the effects of the distribution and percentage of initial defects in ice on the ice loads were analyzed respectively.The results show that the initial defects in ice have a significant effect on both the fracture failure mode of level ice and theice loads on the conical structure.