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新型负泊松比梯度结构缓冲性能
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Cushioning Performance of a New Negative Poisson’s Ratio Gradient Structure
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    摘要:

    在传统内凹六边形蜂窝结构的基础上,结合甲虫鞘翅结构提出一种新型负泊松比蜂窝结构,基于有限元软件Abaqus/ Explicit仿真计算比较所提出的新型负泊松比结构与内凹六边形结构的抗冲击能力和能量吸收能力,以初始碰撞峰值力和比吸能为评价指标,结果表明新型负泊松比结构相较于内凹六边形结构的初始峰值力降低了28%,在压缩后程进入密实化阶段前结构吸能能力提高了35%.以胞元角度作为梯度变换参数来构造不同梯度排列的新型负泊松比结构,计算分析和对比不同梯度结构与均匀新型负泊松比结构的缓冲性能以及各结构在冲击过程中的变形模态,结果表明四种梯度结构均可强化结构的抗冲击能力,但在能量吸收性能上,分层递变正梯度结构(C3)的吸能能力较强.使用3D打印技术制作C3结构和均匀新型负泊松比结构的实验样件,进行准静态冲击实验,通过对比分析验证了仿真结果的正确性.本文研究结果表明:合理的梯度分布排列方式对提高结构的抗冲击性能和能量吸收能力有重要意义,为后续探索结构缓冲设计提供参考.

    Abstract:

    Based on the traditional concave hexagonal honeycomb structure, a new type of honeycomb structure with a negative Poisson’s ratio is proposed in combination with the beetle’s sheath wing structure. The impact resistance and energy absorption capacity of the new types of honeycomb structures with negative Poisson’s ratio and the concave hexagonal structure are compared based on the simulation calculation of the finite element software Abaqus/Explicit. The initial impact peak force and energy absorption per unit mass are taken as evaluation indexes. The results show that the initial peak force of the new structure with negative Poisson’s ratio is 28% lower than that of the concave hexagonal structure, and the energy absorption capacity of the structure is increased by 35% before compression enters the densification stage. The cell angle is used as the gradient transformation parameter to construct a new type of negative Poisson’s ratio structure with different gradient arrangements. The cushioning performance of different gradient structures and new uniform types of negative Poisson’s ratio structures are calculated, analyzed, and compared, together with the deformation modes of each structure in the impact process. The results show that the four gradient structures can enhance the impact resistance of the structure, but in terms of energy absorption performance, the layered progressive positive gradient structure (C3) has a strong energy absorption capacity. The experimental samples of the C3 structure and uniform new negative Poisson’s ratio structure are made using 3D printing technology, and the quasi-static impact test is carried out. The correctness of the simulation results is verified through comparative analysis. The research results in this paper show that the reasonable gradient distribution arrangement is of great significance to improve the impact resistance and energy absorption capacity of the structure, and provides a reference for the subsequent exploration of structural buffer design.

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ZHU Dongmei?,LU Guangyang, DU Yao, ZHAO Cheng.新型负泊松比梯度结构缓冲性能[J].湖南大学学报:自然科学版,2023,(10):203~211

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  • 在线发布日期: 2023-11-13
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