基体材料对铝蜂窝动态强化特性的影响

谭思博; 侯兵; 李玉龙; 赵涵

doi:10.11883/1001-1455(2015)01-0016-06

基体材料对铝蜂窝动态强化特性的影响

doi: 10.11883/1001-1455(2015)01-0016-06

谭思博¹,
侯兵¹,
李玉龙^1, ,,
赵涵²

1.
西北工业大学航空学院，陕西西安 710072
2.
LMT实验室，法国卡尚高等师范学校/法国国家科研中心8535混合研究单位/巴黎第六大学，法国卡尚 94235

基金项目: 国家自然科学基金项目(11202168)

详细信息

作者简介:
谭思博(1989—), 男, 硕士研究生

通讯作者:
李玉龙, liyulong@nwpu.edu.cn

中图分类号: O347.3
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- 被引次数: 0
出版历程
- 收稿日期: 2013-05-31
- 修回日期: 2013-09-26
- 刊出日期: 2015-01-25

Effect of base materials on the dynamic enhancement of aluminium honeycombs

1.
School of aeronautics, Northwestern Politrchnial University, 710072 Xi'an, China
2.
Laboratorie de Mécanique et Technologie, ENS-Cachan/CNRS-UMR8535/Uneversité Paris 6, 61 avenue du president Wilson, 94235 Cachan cedex, France

摘要

摘要: 为了明确基体材料对铝蜂窝动态强化行为的影响，首先从铝蜂窝结构中取出蜂窝壁，制成小试样并对其进行了力学性能测试，然后对几何参数相同而基体材料不同的2种铝蜂窝材料分别进行了单轴面外静态和动态压缩实验。实验结果表明, 2种铝蜂窝均存在明显的动态强化现象，但动态强化率存在显著差异。横向惯性理论可以解释蜂窝的动态强化行为和强化率的差异：基体材料应变硬化率高的铝蜂窝，其面外方向的动态强化现象相对更显著。
- 固体力学 /
- 基体材料 /
- 动态强化 /
- 铝蜂窝 /
- 面外压缩
Abstract: In order to clarify the influence the base materials have on aluminium honeycombs and to explore the difference of the buckling modes between dynamic and static compression, research of honeycombs with different base materials (3003H18 and 5052H18 aluminium alloy) was done. Test on specimens cut from aluminium honeycombs was conducted to investigate the uniaxial tension mechanical properties of base materials in this study. Both quasi-static and dynamic experiments on aluminium honeycombs with same geometry but made of different base materials were conducted. The quasi-static test was performed using universal tester with the loading speed of 0.1 mm/s and an "SHPB" system with large diameter PMMA bars was adopted in dynamic test with two average impact speeds (10 m/s and 28 m/s). High speed camera was applied in "SHPB" test to capture the image of the dynamic deformation of aluminium honeycomb structure. The test results showed that three stages can be divided in the compression of honeycombs and the buckling modes of different aluminium honeycombs under different loading speeds were the same. Dynamic enhancement existed in two kinds of aluminium honeycombs but with different enhancement ratios. The dynamic enhancement of 3003H18 honeycombs was more remarkable than that of 5052H18. Inertia theory can explain the enhancement. With the analysis of the result of base-material experiment, consumption was made that Honeycombs with a higher strain hardening rate tend to have a more remarkable enhancement.
- solid mechanics /
- base material /
- dynamic enhancement /
- aluminium honeycombs /
- out-of-plane compression

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图 1 铝箔拉伸试样和铝箔拉伸实验

Figure 1. Specimen and schematic of foil-tension experiment

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图 2 蜂窝试样和胞元尺寸

Figure 2. Specimen of honeycombs and its cell diameter

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图 3 拉伸实验中2种铝箔的真实应力应变曲线

Figure 3. Stress-strain curves of two kinds of aluminium foil

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图 4 蜂胞的等效横截面

Figure 4. Equivalent cross-sectional area of honeycombs

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图 5 铝蜂窝静态单轴压缩实验的重复性

Figure 5. Static compression test of aluminium honeycombs

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图 6 不同胞元数目蜂窝的平均应力σ比较

Figure 6. Nominal stress of honeycombs with different cells

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图 7 蜂窝压缩的渐进屈曲

Figure 7. Progressive buckling of honeycombs

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图 8 蜂窝动态压缩信号

Figure 8. Signals of SHPB test of aluminium honeycombs

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图 9 2种基体材料蜂窝的动态和准静态平均应力位移曲线

Figure 9. Nominal stress-displacement curves of honeycombs under static and dynamic loading

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图 10 刚塑性杆模型^[9]

Figure 10. Rigid-plastic hinge model ^[9]

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图 11 铝蜂窝强化的横向惯性效应原理

Figure 11. Lateral inertia theory of aluminium honeycombs

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表 1 不同基体材料蜂窝的平台应力

Table 1. Plateau stress of honeycombs with different materials

材料/加载速度	σ_p/MPa	Δσ/MPa	γ/%
3003H18 (0.1 mm/s)	1.51
3003H18 (10 m/s)	2.21	0.70	46
3003H18 (28 m/s)	2.40	0.89	59
5052H18 (0.1 mm/s)	1.91
5052H18 (10 m/s)	2.44	0.53	28
5052H18 (28 m/s)	2.66	0.75	39

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