仿羊角管状复合材料结构抗冲击性能. (Chinese)

Horns exhibit excellent impact resistance due to their unique tubular microstructure. This study draws inspiration from the microstructure of horns and designs a tubular structure. Based on 3D printing fused deposition technology, a horn-inspired tubular structure (HTS) was fabricated using chopped carbon fiber reinforced nylon composites. The impact test results show that there is a long high-load platform region in the impact forcedisplacement curve of HTS, which absorbs a large amount of impact energy at this stage. Compared with the unbiomimetic structure sample, the energy absorption of HTS sample increases by 143.9%, and the specific energy absorption value increases by 178.8%. The HTS impact finite element model was proposed, and the simulation prediction results are in good agreement with the experimental results of the impact response and crack propagation path, which verifies the validity of the model. Based on the analysis of the model, it is found that a large stress concentration is generated around the tube during the impact process, which deflects the crack and captures the crack, and re-initiates new cracks in other positions of the tube and expands toward the next tube. This process is repeated to absorb a large amount of impact energy. Finally, the influences of geometric parameters and material properties on impact energy absorption of HTS were explored based on the finite element model. This study explored the impact energy absorption characteristics and energy absorption mechanism of the horn-inspired tubular composite structure, which was of great significance for the design and manufacture of new impactresistant equipment. [ABSTRACT FROM AUTHOR]

羊角因其独特的管状微观结构显示出优异的抗冲击性能. 本文从羊角微观结构汲取灵感, 设计了仿 羊角管状结构. 基于 3D 打印熔融沉积技术, 采用短切碳纤维增强尼龙复合材料制备了仿羊角管状结构 (HTS). 冲击实验结果表明 HTS 试样的冲击载荷-位移曲线中存在较长的高载荷平台区, 在此阶段吸收了大量 的冲击能量, 较非仿生样品吸能提升了 143.9%, 比吸能值提升了 178.8%. 提出了 HTS 冲击有限元模型, 仿 真预测结果和实验获得的冲击响应及裂纹扩展路径结果吻合较好, 验证了该模型的有效性. 采用该模型分析 发现：在冲击过程中细管周围产生较大的应力集中, 使裂纹发生偏转进而捕获裂纹, 并在细管其他位置重新 萌生新的裂纹并朝下一个细管扩展, 这个过程不断重复, 从而吸收了大量的冲击能量. 最后, 基于该有限元 模型探索了几何参数和材料性能对 HTS 冲击吸能的影响规律. 该研究探索了仿羊角管状复合材料结构冲击 吸能特性和吸能机制, 对新型抗冲击装备的设计和制备具有重要意义. [ABSTRACT FROM AUTHOR]

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