负泊松比三明治结构填充泡沫混凝土的面内压缩性能

周宏元; 贾昆程; 王小娟; 刘路

doi:10.13801/j.cnki.fhclxb.20191207.001

负泊松比三明治结构填充泡沫混凝土的面内压缩性能

doi: 10.13801/j.cnki.fhclxb.20191207.001

北京工业大学城市与工程安全减灾教育部重点实验室，北京 100124

基金项目: 国家自然科学基金(51808017; 51778028)；北京市自然科学基金(8184063)；北京市教委科技计划(KM201810005019)

详细信息

通讯作者:
王小娟，博士，讲师，硕士生导师，研究方向为建筑材料力学性能　E-mail：xiaojuanwang@bjut.edu.cn

中图分类号: TB330.1；TB333
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- 被引次数: 0
出版历程
- 收稿日期: 2019-09-18
- 录用日期: 2019-11-05
- 网络出版日期: 2019-12-09
- 刊出日期: 2020-08-15

In-plane compression properties of negative Poisson's ratio sandwich structure filled with foam concrete

Key Laboratory of Urban Security and Disaster Engineering of Ministry of Education, Beijing University of Technology, Beijing 100124, China

摘要

摘要: 为改善负泊松比三明治结构的受压破坏模式且提高其缓冲吸能能力，提出一种填充泡沫混凝土的新型复合三明治结构。在负泊松比结构中填充不同密度(409 kg/m³、575 kg/m³、848 kg/m³、1 014 kg/m³)的泡沫混凝土得到负泊松比填充结构，并对无填充负泊松比结构、负泊松比填充结构和泡沫混凝土对照试块在准静态压缩下的破坏模式和吸能特性进行比较。根据荷载-位移关系和破坏模式得到以下结论：当填充物密度较小时，负泊松比填充结构能够将填充物的泊松比限制在较小的数值，胞元表现出内凹的变形模式，结构发生逐渐被压实的压缩破坏；当填充物密度较大时，结构发生“X”型剪切破坏，塑性铰区域和剪切带附近的胞壁发生断裂破坏；泡沫混凝土填充物的密度越大，填充结构的压实应变越小，吸收的能量越多，但当填充物密度超过一定值后，填充物密度的增加对负泊松比填充结构能量吸收能力的提升作用不再明显，结构的比吸能降低。
- 负泊松比结构 /
- 泡沫混凝土 /
- 三明治结构 /
- 准静态压缩 /
- 破坏模式 /
- 能量吸收
Abstract: New composite sandwich structures filled with foam concrete were proposed to improve the failure mode subjected to compression and enhance the energy absorption capacity. The composite structures were made by filling foam concrete of different densities (409 kg/m³, 575 kg/m³, 848 kg/m³, 1 014 kg/m³) into negative Poisson's ratio aluminum structures. The failure modes and energy absorption capacities of the specimens subjected to quasi-static compression were compared among the empty auxetic structures, the auxetic structures filled with foam concrete as well as the standalone foam concrete control specimens. Based on the load-displacement relationship and failure mode, the findings can be reached: With foam concrete of relatively low density filled, the Poisson’s ratio of the auxetic composite structures is limited to a small value, leading to auxetic deformation of the cells and progressive compression mode of the whole structures. With foam concrete of relatively high density filled, the structures exhibit X-type shear failure, in which the cell walls around plastic hinges and shear bands fracture. The energy absorption increases, and the densification strain of the composite structures decreases, with increasing density of the foam concrete. However, with filler density greater than a certain value, the enhancement of energy absorption of the composite structures becomes less remarkable, and the specific energy absorption decreases, with increasing density of the filled foam concrete.
- negative Poisson's ratio structure /
- foam concrete /
- sandwich structure /
- quasi-static compression /
- failure mode /
- energy absorption

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图 1 负泊松比蜂窝芯层设计尺寸

Figure 1. Design size of the negative Poisson's ratio honeycomb core

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图 2 铝皮折叠

Figure 2. Aluminum sheet folding

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图 3 负泊松比结构

Figure 3. Negative Poisson's ratio structure

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图 4 试件浇筑

Figure 4. Specimen manufacturing11

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图 5 负泊松比填充泡沫混凝土结构

Figure 5. Auxetic aluminum structure filled with foam concrete

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图 6 无填充负泊松比结构准静态压缩时的变形模式

Figure 6. Deformation mode of hollow negative Poisson's ratio structure subjected to quasi-static compression

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图 7 填充低密度泡沫混凝土的负泊松比结构准静态压缩时的变形模式

Figure 7. Deformation mode of auxetic structure filled with low density foam concrete subjected to quasi-static compression

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图 8 填充高密度泡沫混凝土的负泊松比结构准静态压缩时的变形模式

Figure 8. Deformation mode of auxetic structure filled with high density foam concrete subjected to quasi-static compression

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图 9 无填充负泊松比结构胞元变形模式(ε=0.91)

Figure 9. Deformation mode of cells of hollow negative Poisson's ratio structure (ε=0.91)

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图 10 填充低密度泡沫混凝土负泊松比结构胞元变形模式

Figure 10. Deformation mode of cells of negative Poisson's ratio foam concrete composite structure filled with low density foam concrete

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图 11 填充高密度泡沫混凝土负泊松比结构胞元变形模式

Figure 11. Deformation mode of cells of negative Poisson's ratio foam concrete composite structure filled with high density foam concrete

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图 12 泡沫混凝土试件名义应力-名义应变关系曲线

Figure 12. Nominal stress-nominal strain relationships of foam concrete specimens

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图 13 填充物密度对泡沫混凝土试件能量吸收能力的影响

Figure 13. Effect of filler density on energy absorption capacity of foam concrete specimens

E_SA—Specific energy absorption

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表 1 负泊松比填充泡沫混凝土结构质量和几何参数

Table 1. Mass and geometric parameters of auxetic aluminum structures filled with foam concrete

Sample	Density of foam concrete /(kg·m⁻³)	Density of sandwich structure /(kg·m⁻³)	Equivalent bottom area/mm²	Height/mm
A-0	—	219	6 642	124
A-F400	409	566	6 561	125
A-F600	575	780	6 723	125
A-F800	848	1 059	7 047	127
A-F1000	1 014	1 172	7 047	128

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表 2 不同泡沫混凝土试件准静态压缩试验能量吸收指标

Table 2. Energy absorption of different foam concrete specimens subjected to quasi-static compression

Sample	Densification strain	Initial peak force/kN	Mean crushing force/kN	Initial peak strength/MPa	Mean crushing strength /MPa	Energy absorption /J	E_SA/ (J·g⁻¹)	C_FE
A-0	0.545	0.422	0.525	0.064	0.079	46.740	0.259	1.244
A-F400	0.460	4.198	4.553	0.640	0.694	303.390	0.653	1.085
A-F600	0.401	13.782	12.538	2.050	1.865	579.680	0.884	0.910
A-F800	0.372	25.444	18.061	3.611	2.563	989.930	1.044	0.710
A-F1000	0.289	33.991	23.481	4.824	3.332	1 050.910	0.994	0.691
F-400	0.600	3.374	2.504	0.337	0.250	150.230	0.367	0.742
F-600	0.565	10.897	8.356	1.090	0.836	472.131	0.820	0.767
F-800	0.526	22.723	14.500	2.272	1.450	762.652	0.898	0.638
F-1000	0.494	46.472	20.751	4.647	2.075	1 025.100	1.011	0.447
Notes: E_SA—Specific energy absorption; C_FE—Crushing force efficiency.

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