| 负泊松比三明治结构填充泡沫混凝土的面内压缩性能 |
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| 引用本文： | 周宏元,贾昆程,王小娟,刘路.负泊松比三明治结构填充泡沫混凝土的面内压缩性能[J].复合材料学报,2020,37(8):2005-2014. |
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| 作者姓名： | 周宏元 贾昆程 王小娟 刘路 |
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| 作者单位： | 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 |
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| 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) |
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| 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。
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| 关 键 词： | 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 |
| 收稿时间： | 2019-09-18 |
In-plane compression properties of negative Poisson's ratio sandwich structure filled with foam concrete |
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| Affiliation: | Key Laboratory of Urban Security and Disaster Engineering of Ministry of Education, Beijing University of Technology, Beijing 100124, China |
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| 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. |
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