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多段填充复合蜂窝结构的动态响应特性研究
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Study on Dynamic Response Characteristics of Multi-segment Filled Composite Honeycombs
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    摘要:

    基于多胞材料独特的力学性能和微结构可设计性强的优势,提出一种多段三角形和六角形蜂窝填充能量吸收复合结构模型. 利用显式动力有限元方法对该模型的动力响应特性和比吸能进行研究,重点讨论了不同恒定冲击速度下,蜂窝结构的排布及其相对密度对复合蜂窝结构宏观变形、动态平台应力、冲击载荷一致性和能量吸收能力的影响. 研究结果表明,所设计的多段填充复合蜂窝结构能够让轴力和弯曲变形共同参与整体变形,实现I类和II类能量吸收结构的优势互补. 通过对各段内微结构及段长的合理选择,复合蜂窝结构的冲击载荷效率明显提高,冲击应力波动幅度明显降低,能够有效地提高并控制蜂窝结构能量吸收效率. 本文对完善多胞结构的耐撞性设计方法和控制能量吸收过程具有指导意义.

    Abstract:

    Based on the potential advantages of unique mechanical performance and the micro-structure better design ability for cellular materials,this paper proposes a multi-segment energy absorption composite model filled with triangular and hexagonal honeycomb. Then, the dynamic response characteristic and the specific energy absorption of this model are numerically investigated by using explicit dynamic finite element (EDFE) method. The effects of honeycomb structure arrangement and relative density on the deformation mode, dynamic plateau stress, crushing load uniformity, and energy absorption capacity of the composite honeycombs are discussed in detail under different constant impact velocities. Research results show that the multi-segment filled honeycombs can realize the complementary advantages of type I and type II structures, which enables the axial force and bending deformation to participate in the overall deformation. Through the proper choice of cell micro-structures in each segment and the segment length, the crushing load efficiency of composite honeycomb is obviously improved and the fluctuation range of impact stress is significantly reduced. Composite honeycomb can effectively improve and control its energy absorption efficiency. These results are useful for the crashworthiness design and energy absorption controllable properties of cellular materials.

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张新春,沈振峰,吴鹤翔,白江畔,曹应平.多段填充复合蜂窝结构的动态响应特性研究[J].湖南大学学报:自然科学版,2020,47(4):67~75

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  • 在线发布日期: 2020-04-23
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