基于自适应FEM-SPH耦合算法的飞机典型部位破片冲击战伤的数值研究

叶纪元 杨扬 徐绯 王逸韬 何宇廷

叶纪元, 杨扬, 徐绯, 王逸韬, 何宇廷. 基于自适应FEM-SPH耦合算法的飞机典型部位破片冲击战伤的数值研究[J]. 爆炸与冲击. doi: 10.11883/bzycj-2023-0252
引用本文: 叶纪元, 杨扬, 徐绯, 王逸韬, 何宇廷. 基于自适应FEM-SPH耦合算法的飞机典型部位破片冲击战伤的数值研究[J]. 爆炸与冲击. doi: 10.11883/bzycj-2023-0252
YE Jiyuan, YANG Yang, XU Fei, WANG Yitao, HE Yuting. Numerical research on fragment impact damage of typical aircraft structures based on an adaptive FEM-SPH coupling algorithm[J]. Explosion And Shock Waves. doi: 10.11883/bzycj-2023-0252
Citation: YE Jiyuan, YANG Yang, XU Fei, WANG Yitao, HE Yuting. Numerical research on fragment impact damage of typical aircraft structures based on an adaptive FEM-SPH coupling algorithm[J]. Explosion And Shock Waves. doi: 10.11883/bzycj-2023-0252

基于自适应FEM-SPH耦合算法的飞机典型部位破片冲击战伤的数值研究

doi: 10.11883/bzycj-2023-0252
基金项目: 国家自然科学基金面上项目(12272309);
详细信息
    作者简介:

    叶纪元(1999- ),男,硕士研究生,yejiyuan_@mail.nwpu.edu.cn

    通讯作者:

    杨 扬(1986- ),男,博士,副教授,npuyang@nwpu.edu.cn

  • 中图分类号: O385

Numerical research on fragment impact damage of typical aircraft structures based on an adaptive FEM-SPH coupling algorithm

  • 摘要: 针对飞机典型部位在遭到高速破片攻击后结构整体的战伤状态及破片的剩余行为开展数值模拟。应用LS-DYNA软件,结合有限单元方法(finite element method, FEM)和光滑粒子流体动力学(smoothed particle hydrodynamics, SPH)两者的优势,建立自适应的FEM-SPH耦合模拟方法,并构建两种飞机典型部位的计算模型,采用六面体网格局部细化方法实现了核心位置的精确模拟,并进行试验来验证数值模型;开展了一系列高速冲击战伤模拟,对比了不同工况下破片高速冲击结构后形成的碎片云和破口形貌,并对破片的剩余速度和质量进行分析,确定了破片在结构蒙皮上的临界跳飞角。结果表明:自适应FEM-SPH耦合算法的计算结果与试验结果吻合良好,能够对破片高速冲击战伤进行有效准确模拟;碎片云分布形状随破片速度增加变得狭长,冲击角度会改变碎片云和结构破口形状朝向;碎片云高度和扩散速度随破片速度或角度的变化趋势基本一致并都呈线性关系;破片的速度减少量不随初始速度变化,质量减少量则与冲击速度成正相关,两者与冲击角度都成负相关;破片临界跳飞角与冲击速度大小基本呈线性关系。研究成果可为飞机战伤后破口预测和快速维修提供一定参考。
  • 图  1  自适应FEM-SPH耦合算法原理

    Figure  1.  Principle of adaptive FEM-SPH coupling algorithm

    图  2  共节点处理的六面体网格局部细化

    Figure  2.  Local refinement of hexahedral grids with shared nodes

    图  3  机身典型部位结构数值模型

    Figure  3.  Numerical models of typical structures on aircraft

    图  4  试验所用的二级轻气炮

    Figure  4.  Two-stage light gas gun used in the experiment

    图  5  试验模型与夹持方式

    Figure  5.  Experimental models and clamping method

    图  6  结构体上最大等效应力-时间曲线

    Figure  6.  Histories of maximum equivalent stress on structure

    图  7  试验与数值模拟的碎片云分布对比

    Figure  7.  Comparison of debris clouds obtained by experiment and simulation

    图  8  不同入射速度下的碎片云分布

    Figure  8.  Distributions of debris cloud at different incident velocities

    图  9  不同入射速度下碎片云高度和扩散速度变化曲线

    Figure  9.  Curves of debris cloud height and spread velocity at different incident velocities

    图  10  不同入射速度下碎片数量变化曲线

    Figure  10.  Curve of the number of fragments at different incident velocities

    图  11  不同入射速度下破片速度时间历程曲线

    Figure  11.  Time history of fragment velocity at different incident velocities

    图  12  不同入射速度下破片质量时间历程曲线

    Figure  12.  Time history of fragment mass at different incident velocities

    图  13  不同入射角度下的结构损伤破口

    Figure  13.  Structure damages at different incident angles

    图  14  不同入射角度下的碎片云分布

    Figure  14.  Distributions of debris cloud at different incident angles

    图  15  不同入射角度下碎片云高度和扩散速度变化曲线

    Figure  15.  Relation between debris cloud height and spread velocity under different incident angles

    图  16  不同入射角度下碎片数量变化曲线

    Figure  16.  Relation between the number of fragments at different incident angles

    图  17  不同入射角度下破片速度时间历程曲线

    Figure  17.  Histories of fragment velocity at different incident angles

    图  18  不同入射角度下破片质量时间历程曲线

    Figure  18.  Histories of fragment mass at different incident angles

    图  19  各速度下确定临界跳飞角的拟合曲线

    Figure  19.  Fitting curves to define the critical ricochet angle at different velocities

    图  20  临界跳飞角与初始入射速度大小关系

    Figure  20.  Relation between the critical ricochet angles and initial incident velocities

    表  1  所用材料的本构模型和状态方程参数

    Table  1.   Material parameters of steel, titanium and aluminium

    材料ρ/(kg·m−3)E/GPaνσy/GPaET/GPacS/(m·s−1)SSΓ
    10#钢7850207.00.301.0520///
    OT-4钛4550115.00.30//53501.3401.97
    7075铝281071.70.33//51201.0281.23
    下载: 导出CSV

    表  2  各速度下临界跳飞角拟合曲线的参数

    Table  2.   Parameters of fitting curves to define the critical ricochet angle under different velocities

    v0/(km·s−1) a b c R2 θc/(°)
    2.4 −20.2 3001 −111233 0.9817 72.13
    2.2 −7.8 1179 −44504 0.9497 71.70
    2.0 −7.0 1059 −39745 0.9093 70.69
    1.8 −14.3 2105 −77215 0.8971 70.22
    下载: 导出CSV
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出版历程
  • 收稿日期:  2023-07-19
  • 修回日期:  2024-01-30
  • 网络出版日期:  2024-05-07

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