| 摘要: |
| 目的 考虑到蜂窝芯斜向孔壁发生折叠的能量耗散机制，建立基于孔壁折叠的平台应力表达式。方法 首先从理论上分析蜂窝芯变形单元水平固定塑性铰的能量耗散情况，然后对不同厚跨比条件下的蜂窝纸芯进行横向面内压缩试验，得到平台应力，最后将试验结果与Gibson & Ashby模型以及文中模型进行对比。结果 蜂窝胞壁厚度与蜂窝胞元边长之比对平台应力有一定的影响，蜂窝芯面内压缩平台应力与胞壁厚度和蜂窝胞元边长之比的平方呈正比关系。由对比结果可知，文中模型理论值与平台应力试验值更加吻合。结论 揭示了蜂窝芯横向面内压缩的能量耗散机制，平台应力表达式可用于多种材料的双壁厚蜂窝面内压缩力学性能的评估，具有一定的普适性。 |
| 关键词: 纸蜂窝芯 横向面内压缩 平台应力 |
| DOI：10.19554/j.cnki.1001-3563.2018.05.001 |
| 分类号:TB485.1 |
| 基金项目:国家自然科学基金（51205167）；中央高校基本科研业务费重点项目（JUSRP51403A） |
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| Plateau Stress of Crosswise In-plane Compression of Honeycomb Core |
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GUO Rui1, WANG Jun2,3, LU Li-xin2,3
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1.Jiangnan University, Wuxi 214122, China;2.1.Jiangnan University, Wuxi 214122, China;3.2.Jiangsu Key Laboratory of Advanced Food Manufacturing Equipment and Technology, Wuxi 214122, China
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| Abstract: |
| The work aims to set up the plateau stress expression based on folding of hole wall by considering the energy dissipation mechanism for folding of slant hole wall of honeycomb core. First, the energy dissipation of horizontal fixing plastic hinge of deformed units of honeycomb core was analyzed theoretically; then, crosswise in-plane compression tests were carried out on honeycomb cores under different thickness-span ratios to acquire the plateau stress; finally, the test results were compared with Gibson & Ashby model and the proposed model. The ratio of thickness of honeycomb cell wall to side length of honeycomb cell element had certain influence on the plateau stress. The honeycomb core in-plane compression plateau stress was proportional to the square of the ratio of cell wall thickness to side length of honeycomb cell element. Based on the comparison results, the theoretical value of the proposed model and the test value of plateau stress were more identical. It reveals the energy dissipation mechanism of honeycomb core crosswise in-plane compression. The plateau stress expression can be applied in the evaluation of mechanical property of double-wall thick honeycomb in-plane compression of various materials, and thus has certain universality. |
| Key words: honeycomb core crosswise in-plane compression plateau stress |
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