爆炸冲击载荷下典型机身结构动响应及破坏

doi:10.7527/S1000-6893.2020.24252

固体力学与飞行器总体设计

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爆炸冲击载荷下典型机身结构动响应及破坏

刘宗兴^1,2, 刘军¹, 李维娜³

1. 西北工业大学航空学院, 西安 710072;
2. 海山实业发展总公司, 石家庄 050200;
3. 中国商飞上海飞机设计研究院, 上海 201210

收稿日期:2020-05-20 修回日期:2020-07-11 发布日期:2020-10-23
通讯作者: 刘军 E-mail:liujun_top@126.com

Dynamic response and failure of typical fuselage structure under blast impact load

LIU Zongxing^1,2, LIU Jun¹, LI Weina³

1. School of Aeronautics, Northwestern Polytechnical University, Xi'an 710072, China;
2. Haishan Industrial Development Corporation, Shijiazhuang 050200, China;
3. COMAC Shanghai Aircraft Design and Research Institute, Shanghai 201210, China

Received:2020-05-20 Revised:2020-07-11 Published:2020-10-23

摘要/Abstract

摘要： 确定满足适航要求的最小风险炸弹位置，必须研究爆炸冲击载荷下机身结构动响应及破坏模式。以某型飞机典型机身结构为研究对象，采用LS-DYNA商用软件，建立了爆炸冲击载荷下机身典型结构动响应数值模型。采用控制变量法分析了爆炸物当量、爆炸冲击距离以及爆炸冲击位置对典型机身结构动响应及破坏模式的影响，同时研究了损伤后典型机身结构的剩余强度。研究结果表明，造成机身结构有效破坏的爆炸物临界当量与爆炸冲击距离密切相关；爆炸冲击距离对典型机身结构损伤及剩余强度影响不明显；典型机身结构筋条位置对剩余强度影响较大。在此基础上，提出了表征剩余强度的无量纲系数，并建立了剩余强度无量纲系数与爆炸物当量及爆炸冲击距离之间的函数关系。

关键词: 爆炸冲击波, 最小风险炸弹位置, 数值模拟, 损伤研究, 剩余强度

Abstract: The dynamic response and failure mode of the fuselage structure under explosive impact loads must be studied to determine the location of the minimum risk bomb that satisfies the airworthiness requirements. Taking the typical fuselage structure of a certain type of aircraft as the research object, this study uses the LS-DYNA commercial software to establish the numerical model of the dynamic response of the typical fuselage structure under explosive impact loads. The control variable method is adopted to analyze the effects of the explosive equivalent, explosive impact distance and explosive impact location on the dynamic response and failure mode of typical fuselage structures. Meanwhile, the residual strength of typical fuselage structures after damage is studied. Results show that the critical equivalent of explosives causing effective damage to the fuselage structure is closely related to the blast impact distance; the blast impact distance has little effect on the damage and residual strength of typical fuselage structures; the position of steel bars of typical fuselage structures has considerable influence on the residual strength. On this basis, the dimensionless coefficients representing the residual strength are proposed, and the functional relationship between the dimensionless coefficients of the residual strength, and the explosive equivalent and explosion impact distance is established.

Key words: explosion shock waves, least risk bomb location, numerical simulation, damage study, residual strength

中图分类号:

V215.2

刘宗兴, 刘军, 李维娜. 爆炸冲击载荷下典型机身结构动响应及破坏[J]. 航空学报, 2021, 42(2): 224252-224252.

LIU Zongxing, LIU Jun, LI Weina. Dynamic response and failure of typical fuselage structure under blast impact load[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2021, 42(2): 224252-224252.

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E-mail：hkxb@buaa.edu.cn

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爆炸冲击载荷下典型机身结构动响应及破坏

Dynamic response and failure of typical fuselage structure under blast impact load

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