3D打印仿生多重管状吸能结构碳纤维复合材料及其力学性能

Structure and mechanical properties of 3D printed biomimetic multi-tubular carbon fiber composites

  • 摘要: 本文基于马蹄、骨骼等自然界生物组织的管状吸能结构启发,设计并制备了一种仿生多重管状结构的碳纤维复合材料。通过3D打印制造出具有多重管状结构的碳纤维复合材料,并引入紫外光固化技术使柔性聚氨酯树脂在管状结构中固化而形成异质界面,显著提升了材料的韧性和抗冲击能力。实验结果表明,该仿生结构材料在静态压缩测试中展现出延长的屈服阶段和优异的变形恢复能力,比强度和能量吸收密度可达130.6 MPa/(g/cm3)和44.6 J/g,高于传统的蜂窝吸能结构;在三点弯曲试验中表现出更长的塑性变形区域,其断裂韧性为碳纤维板的1.54倍;在冲击测试中,裂纹扩展受限于管的分布,并且通过异质界面破坏显著提高吸收能量,避免了材料发生灾难性破坏。该研究为复合材料的抗冲击设计提供了新的仿生策略,尤其在国防、航空航天等需要高韧性、高强度材料的应用领域,具有广泛的应用潜力和前景。

     

    Abstract: Inspired by energy absorbent natural tubular biological structures, a bionic multi-tubular carbon fiber composite was designed. This bionic material was fabricated using 3D printing and UV curing, incorporating heterogeneous interfaces to significantly enhance toughness and impact resistance. Experimental results demonstrate that the bionic structure material exhibits an extended yield phase and exceptional deformation recovery in static compression tests, with the specific energy absorption of 44.6 J/g and specific strength of 130.6 MPa/(g/cm3). In three-point bending tests, the material shows a prolonged plastic deformation region. The fracture toughness is 1.54 times compared to carbon fiber composite. For impact tests, it effectively absorbs energy with restricted crack propagation, and the destruction of heterogeneous interface. This study provides biomimetic insights for the design of impact-resistant composite materials.

     

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