冰柱冲击问题的数值仿真分析

doi:10.16183/j.cnki.jsjtu.2020.278

摘要/Abstract

摘要：

为研究近场动力学(PD)方法在冰力学行为领域的应用特性及在冰破坏数值预报过程中的参数敏感性,采用常规状态型近场动力方法系统地计算分析了冰柱冲击破坏过程,并进行了参数敏感分析.结果表明:该方法模拟冰冲击过程与试验对比结果基本一致,在选定的时间步长和粒子间距下本文的计算结果收敛.海冰冲击速度、泊松比、弹性模量对海冰冲击过程影响明显,而海冰尺寸和断裂韧度对冲击过程影响较小.文章创新之处在于将状态型PD方法应用于海冰冲击问题中,弥补了键型PD方法限制海冰泊松比的缺点.

关键词: 柱状冰, 常规态型近场动力学, 参数敏感分析, 冲击载荷

Abstract:

In order to study the application characteristics of the peridynamics (PD) method in the field of ice mechanical behavior and the sensitivity analysis of parameter changes in the numerical prediction of ice failure, the ordinary state-based peridynamic method is employed to systematically analyze the impact failure process of cylindrical ice in the present work. The results show that the simulated ice impact process by the proposed method is basically consistent with the test results, and the calculation results converge under the selected time step and particle spacing. The impact velocity, Poisson’s ratio, and the elastic modulus of the ice have remarkable effects on the impact process of ice cylinder, while the size and fracture toughness of the ice only have little influence. The innovation of this paper lies in the fact that the state-based PD method is applied to study the ice impact problem, which compensate for the shortcomings of the bond-based PD method that limits the Poisson’s ratio of the ice.

Key words: cylindrical ice, ordinary state-based peridynamics, parameters sensitivity analysis, impact load

中图分类号:

U661
O313.4

王超, 杨波, 张媛, 郭春雨, 叶礼裕. 冰柱冲击问题的数值仿真分析[J]. 上海交通大学学报, 2022, 56(3): 368-378.

WANG Chao, YANG Bo, ZHANG Yuan, GUO Chunyu, YE Liyu. Numerical Simulation and Analysis of Cylindrical Ice Impacting Problem[J]. Journal of Shanghai Jiao Tong University, 2022, 56(3): 368-378.

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计算参数	近场动力学参数
尺寸:厚度H=42 mm、半径r=9 mm	粒子间距:d_x=D/25
冲击速度:v_ice=61.4 m/s	领域半径δ=3.015d_x
弹性模量:1.8 GPa	粒子数:约590000
失效准则:s₀=0.003 (K₁=150 (kPa·m)^0.5)