| 倾斜胞壁Nomex蜂窝芯压剪复合力学响应 |
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| 引用本文： | 赵志勇,袁昊,刘闯,李玉军,孙立帅,王俊彪.倾斜胞壁Nomex蜂窝芯压剪复合力学响应[J].复合材料学报,2023,40(1):521-529. |
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| 作者姓名： | 赵志勇 袁昊 刘闯 李玉军 孙立帅 王俊彪 |
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| 作者单位： | 西北工业大学 机电学院，西安 710072 |
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| 基金项目： | 国家自然科学基金(11902256)；陕西省自然科学基金(2019JQ-479) |
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| 摘 要： | 成形具有一定曲率的夹层结构时，需要将蜂窝芯铣削成曲面形状，造成蜂窝胞壁呈一定倾角，进而降低蜂窝夹芯结构面外承载能力。为了定量化分析面外载荷作用下倾斜胞壁蜂窝芯的力学性能，建立了倾斜胞壁蜂窝芯面外压剪复合有限元模型，并通过设计专用Arcan夹具实现蜂窝芯的面外压剪复合加载，用于验证模型的有效性。对比仿真与实验结果，发现蜂窝芯压剪响应及胞壁变形模式吻合较好。利用验证的有限元模型对胞壁倾角范围为0°～40°的蜂窝芯在面外压剪复合载荷下的力学响应进行了研究，结果表明随着蜂窝胞壁倾角的增大，蜂窝芯面外承载能力逐渐降低；当胞壁倾斜角由0°增加到40°，初始应力峰值下降最大幅度为47.7%，平原阶段强度下降幅度为29%；进一步分析了倾斜胞壁蜂窝芯截面芯格尺寸与胞壁倾角的几何关系，将倾斜胞壁蜂窝芯等效为具有相同截面尺寸的垂直胞壁蜂窝芯，推导了倾斜胞壁蜂窝芯在面外压缩及剪切载荷作用下的坍塌强度，揭示了胞壁倾角对蜂窝芯坍塌强度影响机制。
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| 关 键 词： | Nomex蜂窝芯 倾斜胞壁 压剪复合 力学响应 坍塌强度 |
| 收稿时间： | 2021-11-24 |
Mechanical response of inclined Nomex honeycombs under combined shear-compression loads |
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| Affiliation: | School of Mechanical Engineering, Northwestern Polytechnical University, Xi’an 710072, China |
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| Abstract: | When forming curved honeycomb sandwich structures, it needs to mill the honeycomb core into a curved shape, resulting in inclined cell walls of honeycombs and reducing its mechanical properties. A detailed finite element model was introduced to analyze the mechanical response and deformation mechanism of inclined honeycombs, and then verified by means of experiments using a specially designed set-up. The simulated results agree well with the experimental ones in terms of the crushing behavior and collapse mechanism. After that, the validated model was used to evaluate the effect of the inclined cell wall angle range from 0° to 40° on the crushing behavior of honeycombs. It is found that the inclined cell wall angle has a signi?cant effect on the crushing response, and the mechanical properties of honeycomb decrease as the inclined cell wall angle increases. When the inclined cell wall angle varies from 0o to 40o, the maximum reduction of initial peak stress and the plateau strength is 47.7% and 29%, respectively. Moreover, the relationship between the dimension of cross-section about inclined cell wall honeycomb cores and the inclined angle was analyzed. The collapse stress of honeycomb under out-of-plane compression and shear loading is deduced by equivalent the inclined cell wall honeycomb as a vertical cell wall honeycomb with the same cross-section dimension, which reveals the influence mechanism of inclined cell wall angle on the properties of honeycombs. |
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