School of Mechanical Engineering and Automation, Beihang University, Beijing, 100091, PR China; Institute of Bionic and Micro-Nano Systems, Beihang University, Beijing, 100091, PR China.
School of Mechanical Engineering and Automation, Beihang University, Beijing, 100091, PR China; Institute of Bionic and Micro-Nano Systems, Beihang University, Beijing, 100091, PR China.
Acta Biomater. 2023 Oct 1;169:179-191. doi: 10.1016/j.actbio.2023.07.047. Epub 2023 Jul 29.
The majority of living organisms demonstrate remarkable attributes and have evolved effective mechanisms for synthesizing impact-resistant and damage-tolerant structures. One exemplary instance is the rapid mandible strikes exhibited by trap-jaw ants, which are a highly aggressive species of terrestrial social organisms. An impact-resistant sinusoidal helicoidal architecture is discovered in the mandibles of trap-jaw ants. The bioinspired laminate with a bi-sinusoidal helicoidal structure was manufactured using unidirectional carbon fiber prepreg by mold press forming. This study examines the impact resistance and damage tolerance of a bionic laminate through low velocity impact, computed tomography, and compression after impact tests. The results demonstrate that bionic laminates effectively limit damage propagation within the plane while enhancing energy dissipation capacity. The sinusoidal helicoidal configuration enhances cushioning capability against impact forces, retards penetration under higher loads, hinders crack propagation, and improves residual strength. Bionic laminates provide a valuable solution for damage tolerance through the resistance to through-the-thickness loads. STATEMENT OF SIGNIFICANCE: Helicoidal and sinusoidal helicoidal microstructures have been identified in the cross-section of the jaws of trap-jaw ants. The multiple waviness ratio parameters are designed for fabricating a sinusoidal helicoidal structure laminate using unidirectional carbon fiber prepreg through the mold press forming technique. This results in a damage-tolerant mechanism characterized by reduced delamination damage, which leads to a stiffer mechanical response. Meanwhile, it enhances resistance to crack propagation, leading to the formation of discontinuous delamination areas and the accumulation of sub-critical failures. Additionally, the sinusoidal helicoidal structure laminate combines the cushioning performance of bi-sinusoidal arrangements with the enhanced impact resistance of helical arrangements. This design delays penetration at higher loads, resulting in increased residual strength.
大多数生物都表现出了显著的特性，并进化出了有效的机制来合成具有抗冲击和耐损伤的结构。一个典型的例子是捕蝇草蚂蚁（一种极具攻击性的陆地社会性生物）所展示的快速下颚撞击行为。在捕蝇草蚂蚁的下颚中发现了一种具有抗冲击性的正弦螺旋状结构。通过模具压制成型，使用单向碳纤维预浸料制造了具有双正弦螺旋结构的仿生层压板。本研究通过低速冲击、计算机断层扫描和冲击后压缩试验，研究了仿生层压板的抗冲击性和耐损伤性。结果表明，仿生层压板在限制平面内损伤扩展的同时，有效地提高了能量耗散能力。正弦螺旋结构提高了对冲击力的缓冲能力，在较高载荷下延缓了穿透，阻碍了裂纹扩展，并提高了残余强度。仿生层压板通过抵抗贯穿厚度的载荷为耐损伤性提供了一种有价值的解决方案。 意义陈述：在捕蝇草蚂蚁的下颚横截面上已经确定了螺旋状和正弦螺旋状微观结构。通过模具压制成型技术，使用单向碳纤维预浸料设计了多个波幅比参数，以制造正弦螺旋结构层压板。这导致了一种具有耐损伤性的机制，其特征是分层损伤减少，从而产生更硬的机械响应。同时，它增强了对裂纹扩展的抵抗力，导致不连续分层区域的形成和亚临界故障的积累。此外，正弦螺旋结构层压板结合了双正弦排列的缓冲性能和螺旋排列的增强抗冲击性。这种设计在较高载荷下延迟了穿透，从而提高了残余强度。
