| 复合材料负泊松比格栅结构设计及力学性能评价 |
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| 引用本文： | 于雅琳,李健芳,黄智彬,莫申忠,王乐辰,黄玉清.复合材料负泊松比格栅结构设计及力学性能评价[J].复合材料学报,2021,38(4):1107-1114. |
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| 作者姓名： | 于雅琳 李健芳 黄智彬 莫申忠 王乐辰 黄玉清 |
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| 作者单位： | 航天材料及工艺研究所，北京 100076 |
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| 基金项目： | 火箭军装备预先研究项目(900703800205010115911901)；航天材料及工艺研究所技术创新基金(900703800803000115911801) |
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| 摘 要： | 对复合材料负泊松比格栅新结构的设计、制备与评价进行了研究，采用有限元方法模拟了负泊松比结构单元在轴压载荷作用下的力学行为，通过热压罐成型制备复合材料负泊松比格栅结构，并评估其成型质量、蒙皮及筋条的力学性能、结构抗轴压性能。数值模拟结果表明，负泊松比格栅结构与正交格栅结构相比，变形形式从马鞍形变为波纹形，横向膨胀量降低，应力分布均匀性提升，筋条-轴线夹角θ=30°时，负泊松比格栅结构达到最优。采用热压罐成型的MT300/603碳纤维/环氧树脂负泊松比格栅试件成型质量良好，蒙皮及筋条的力学性能优异。力学测试结果表明，筋条-轴线夹角θ=30°时，MT300/603负泊松比格栅结构轴压模量为65.92 GPa，轴压失效载荷为64.65 kN。轴压失效模式为筋条节点处的蒙皮-筋条开裂。筋条-轴线夹角θ=30°的MT300/603负泊松比格栅结构抗压强度高于正交格栅结构，且力学行为呈现明显的负泊松比特征，是一种具备优异综合力学性能的新格栅结构，在航天飞行器蒙皮结构等领域具有潜在的应用价值。
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| 关 键 词： | 复合材料 负泊松比 格栅结构 结构设计 力学性能 |
| 收稿时间： | 2020-05-18 |
Structural design and mechanical characterization of an auxetic advanced grid structure composite |
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| Affiliation: | Aerospace Research Institute of Materials & Processing Technology, Beijing 100076, China |
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| Abstract: | The structural design, manufacture and mechanical evaluation of an auxetic advanced grid structure (AGS) composite were investigated. The mechanical behavior of the auxetic AGS composite under the compressive loading was simulated via finite element method (FEM). The auxetic AGS composite was fabricated via autoclave processing, and the processing quality and mechanical properties were evaluated. The simulation results show that the auxetic AGS composite after deformation is in a corrugation shape, which is different from the saddle deformation shape of the orthogonal AGS composite. Compared with the orthogonal AGS composite, the transverse expansion is lower and the stress is more uniformly distributed. An 30° included angle between grid and axis is the most optimal structure for the auxetic AGS composite. Excellent manufacturing quality and superior mechanical properties are found for the MT300/603 carbon fiber/epoxy auxetic AGS composite. The mechanical experiment results show the optimal MT300/603 auxetic AGS composites have a compression modulus of 65.92 GPa and a compression failure load of 64.65 kN. The failure occurs between the grid and skin at the crossing of the grids, showing a higher compression strength than the orthogonal AGS composite. The optimal MT300/603 auxetic AGS composite exhibits a characteristic negative Poisson’s ratio. The AGS composite structure with superior overall mechanical performance can potentially be used on aerospace structures. |
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