仿生轻质高强韧夹芯结构设计及其韧性性能分析

马玉秋; 郭策; 陈光明; 戴宁; 管吉钢; 何湘鹏

doi:10.13433/j.cnki.1003-8728.20200392

仿生轻质高强韧夹芯结构设计及其韧性性能分析

doi: 10.13433/j.cnki.1003-8728.20200392

1.
南京航空航天大学仿生结构与材料防护研究所, 南京 210016
2.
南京航空航天大学机电学院, 南京 210016
3.
南京航空航天大学航天学院, 南京 210016

基金项目:

国家自然科学基金项目 51875282

详细信息

作者简介:
马玉秋(1997-), 硕士研究生, 研究方向为轻质多功能仿生结构与材料, yuqiu_ma@163.com

通讯作者:
郭策, 教授, 博士生导师, guozc@nuaa.edu.cn

中图分类号: TG156
计量
- 文章访问数: 98
- HTML全文浏览量: 98
- PDF下载量: 21
- 被引次数: 0
出版历程
- 收稿日期: 2020-08-15
- 刊出日期: 2022-05-01

Design and Toughness Analysis of Bionic Lightweight Sandwich Structure with High Strength and Toughness

1.
Institute of Bioinspired Structure and Surface Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China
2.
College of Mechanical & Electrical Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China
3.
Academy of Astronautics, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China

摘要

摘要: 复合材料轻质夹芯结构因其优异的力学性能被广泛应用于航空航天领域。本文在对白星花金龟鞘翅断面形貌观测的基础上, 根据鞘翅表皮层中纤维铺排方式以及微观结构特征设计了仿鞘翅轻质高韧夹芯结构。并利用有限元法对复合材料双螺旋铺层面板以及仿生鞘翅夹芯结构进行三点弯曲力学性能分析, 对结构韧性进行分析和评价; 进一步对夹芯结构进行承压性能分析。结果表明与传统蜂窝夹芯结构相比, 所设计的仿鞘翅复合材料夹芯结构具有更优异的韧性, 且与蜂窝夹芯结构承压能力相当。该研究对新型轻质高强高韧复合材料结构设计具有一定的参考和指导意义。
- 鞘翅 /
- 轻质结构 /
- 有限元 /
- 三点弯曲 /
- 断裂韧性
Abstract: Composite lightweight sandwich structures are widely used in aerospace because of their excellent mechanical properties. Based on the microstructure of the cross section of Protaetia orentalis's elytra, one bio-inspired light sandwich structure with high toughness was designed according to the characteristics of the fibres arrangement and microstructure in elytra. The three-point bending mechanical properties of bionic double-helix laminate and bionic sandwich structure are studied with finite element method, and the fracture toughness was investigated and evaluated. The compression performance of sandwich structure is further analyzed. The results show that bionic sandwich structures have better toughness and the capacity of bearing comparing with the honeycomb sandwich structure. Moreover, the present study has certain reference and guiding significance for designing new composites with high strength and fracture toughness.
- elytra /
- lightweight structure /
- finite element /
- three-point bending /
- fracture toughness

HTML全文

图 1 白星花金龟鞘翅断面微观结构图

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图 2 两种层合板的有限元模型

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图 3 层合板有限元模型

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图 4 层合板三点弯曲位移-载荷曲线

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图 5 仿生夹芯结构的有限元模型

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图 6 3种夹芯结构三点弯曲应力云图

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图 7 3种夹芯结构位移-载荷曲线

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图 8 3种夹芯结构韧性分析数据

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图 9 3种结构模型及其位移-载荷曲线

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图 10 3种夹芯结构压缩力学性能对比

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表 1 单层碳纤维板材料参数及力学性能

ρ/(kg·m^-3)	E₁=E₂/MPa	E₃/MPa	G₁₂/MPa	G₁₃=G₂₃/MPa	v/MPa	X_T/MPa	X_C/MPa	Y_T/MPa	Y_C/MPa	S₁₂/MPa	S₂₃=S₁₃/MPa
1.5	10 500	8 000	4 320	3 230	0.3	314	314	61	180	73	73

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表 2 Cohesive界面层属性参数^[23]

ρ/(kg·m^-3)	τ_n^(s)/MPa	τ_s^(s)/MPa	τ_t^(s)/MPa	K_n^(s)/MPa	K_s^(s)/MPa	K_t^(s)/MPa	G_ⅠC/(N·mm^-1)	G_ⅡC/(N·mm^-1)	G_ⅢC/(N·mm^-1)
1.3	11	17	17	850	850	314	0.3	0.8	0.8

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表 3 两种层合板力学性能对比

类型	韧性/J
双螺旋	4.12
经纬交织(0~90°)	2.60

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表 4 TC4力学性能

ρ/(kg·m^-3)	E/MPa	v	σ_s/MPa
1.3	118 000	0.3	862

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