基于UMAT的冰—结构相互作用数值仿真

基于ABAQUS 用户自定义子程序UMAT,采用已有的冰的弹性失效准则,针对冰与结构的相互作用进行数值模拟。首先, 通过简单算例验证本文开发的UMAT的正确性；然后, 采用开发的UMAT建立单个冰单元受刚性板挤压下的力学模型,得到力—位移曲线；最后, 通过建立圆柱与冰相互作用的仿真分析模型,探讨冰板厚度对结构反力的影响。研究结果表明,采用用户自定义程序UMAT使得模拟更为复杂的冰力学特性成为可能,可为以后开展大规模的冰—结构相互作用研究奠定基础。

Numerical Simulation of Ice-Structure Interaction Based on UMAT

In this paper, the failure criterion of ice is adopted to define the user-defined material (UMAT) of Abaqus. The UMAT is first proved to be correct through a simple simulation example. Then, the simulation of a single ice element pressed by a rigid plate is performed, and the reaction curve of force-displacement is obtained through simulation. Finally, by simulating the interaction between the ice and a rigid cylinder surface, the relation between the thickness of ice and the reaction force is analyzed, which is shown to be linear. The results presented in this paper indicate that it is feasible to simulate the mechanical properties of ice by the user-defined material, and this finding provides valuable references to future researches concerning large-scale ice-structure interaction.