液固高速撞击时材料表面损伤的数值模拟

汪勇; 谢永慧; 张荻

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液固高速撞击时材料表面损伤的数值模拟

专题研究 | 更新时间：2025-07-09

- 液固高速撞击时材料表面损伤的数值模拟
- Numerical Simulation of Material Surface Damage by High Speed Liquid-Solid Impact
- 西安交通大学学报 2008年42卷第11期页码：1435-1440
- 作者机构：
  
  西安交通大学能源与动力工程学院,西安,710049
- 作者简介：
- 基金信息：
  
  : 2008-01-21. 作者简介: 汪勇(1983-),男,硕士生;谢永慧(联系人),男,教授,博士生导师. 基金项目: 国家高技术研究发展计划专题资助项目(2006AA04Z404);教育部新世纪优秀人才支持计划资助项目(NCET-07-0682)
- DOI：
  中图分类号： O353.4
- 网络首发：2008-11-10，
  
  纸质出版：2008
- 稿件说明：
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汪勇, 谢永慧, 张荻. 液固高速撞击时材料表面损伤的数值模拟[J]. 西安交通大学学报, 2008,42(11):1435-1440.

Numerical Simulation of Material Surface Damage by High Speed Liquid-Solid Impact[J]. 2008, 42(11): 1435-1440.
汪勇, 谢永慧, 张荻. 液固高速撞击时材料表面损伤的数值模拟[J]. 西安交通大学学报, 2008,42(11):1435-1440. DOI：

Numerical Simulation of Material Surface Damage by High Speed Liquid-Solid Impact[J]. 2008, 42(11): 1435-1440. DOI：

摘要

为了研究液固撞击的机理

采用光滑粒子流体动力学方法(SPH)与有限单元法(FEM)建立了考虑流固耦合效应的高速液固撞击数值模型

详细分析了直径为2 mm、撞击速度为1 000 m/s的液滴和射流对有机玻璃(PMMA)的三维撞击和破坏状况.分析表明:射流与液滴在撞击初始时刻的前缘变形和内部压力分布几乎是完全相同的; 液滴撞击固体的最大压力值出现在0.20 μs时

但此时材料内部最大等效应力只有104 MPa

材料还不足以发生破坏; 产生于液固撞击瞬时后0.32 μs、速度高达2 925 m/s的侧向射流是使固体表面产生破坏的主要原因

因此撞击最初的破坏位于以撞击中心为圆心的一个圆环区域处.所得材料表面损伤情况与Brunton的实验数据吻合良好

证明了数值模型的可行性和精确性.

Abstract

The numerical model for high speed liquid-solid impact considering fluid-structure interaction coupling effect was developed based on smoothed particle hydrodynamics(SPH)and finite element method(FEM). The damage of polymethylmethacrylate(PMMA)

caused by a single droplet and a jet impact with a radius of 2 mm and a speed of 1 000 m/s

was analyzed. The numerical results show that the distortion and interior pressure of the droplet and the jet are almost the same at the beginning of impact. The maximum pressure inside the droplet occurs at 0.20 μs after impact

and the maximum equivalent stress inside solid is only 104 MPa which can not lead to material damage. It is mainly the inclined jet which has a speed of 2 925 m/s and occurs at 0.32 μs that causes the material surface damage. The initial damage by impact is located in a circular region whose center is the impact position. The material surface damage predicted by the numerical simulation shows good agreement with the experimental data of Brunton.

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