基于Mohr-Coulomb材料和节点分裂技术的冰压缩载荷有限元模型

H. Herrnring, Sören Ehlers
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引用次数: 4

摘要

本文建立了以低、中约束比破碎为主的冰-结构相互作用问题的有限元模拟模型。冰的破坏模式在很大程度上取决于应变速率。在非常低的冲击速度下,冰表现出延展性,而在高速下,冰反应为脆性。本文主要研究船冰相互作用的主要模式——脆性模式。在文献中可以找到许多模拟冰的数值方法。然而,文献方法似乎不适合在脆性模式下低约束比和中等约束比下的连续冰-结构相互作用过程的模拟。因此,本文试图用有限元方法模拟冰-结构相互作用。为了尽可能地保持质量和能量,采用了节点分裂技术,而不是常用的单元侵蚀技术。所提出的模型的目的不是以高精度再现单个裂缝,因为在合理的单元尺寸下,由于冰-构造相互作用过程中形成了大量的裂缝前沿,这是不可能的。本文介绍的Mohr-Coulomb节点分裂(MCNS)模型的目的是用一种有效的公式来表示冰的基本物质行为。为了验证模型的结果,将模拟的最大冰力和接触压力与实验结果进行了比较。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
A Finite Element Model for Compressive Ice Loads Based on a Mohr-Coulomb Material and the Node Splitting Technique
This paper presents a finite element model for the simulation of ice-structure interaction problems, which are dominated by crushing at low and medium confinement ratios. The failure mode of ice depends significantly on the strain rate. At very low impact velocities the ice behaves ductile, whereas at high velocities the ice reacts in brittle mode. This paper focuses on the brittle mode, which is the dominating mode for ship-ice interactions. A multitude of numerical approaches for the simulation of ice can be found in the literature. Nevertheless, the literature approaches do not seem suitable for the simulation of continuous ice-structure interaction processes at low and medium confinement ratios in brittle mode. Therefore, this paper seeks to simulate the ice-structure interaction with the FE method. To preserve mass and energy as much as possible, the node splitting technique is applied, instead of the often used element erosion technique. The intention of the presented model is not to reproduce individual cracks with high accuracy, because this is not possible with a reasonable element size, due to the large number of crack fronts forming during the ice-structure interaction process. The objective of the here introduced Mohr-Coulomb Nodal Split (MCNS) model is to represent the essential material behavior of ice in a efficient formulation. To validate the findings of the model, the simulated maximum ice forces and contact pressures are compared with experiments.
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