In situ determination of the extreme damage resistance behavior in stomatopod dactyl club.
In situ determination of the extreme damage resistance behavior in stomatopod dactyl club.
复制标题
DOI：
10.1107/s1600577522001217
复制
发表时间：
2022-05-01
影响因子：
2.5
通讯作者：
中科院分区：
文献类型：
--
作者：
在原位球形射弹穿透载荷下口足类动物表皮的多尺度结构和力学特性。揭示了高速冲击下Dactyl球杆内部动态裂纹演化的全过程及其它增韧机制。口足类动物指状体的结构和力学特性因其极端的冲击耐受性而得到广泛的研究，但对高速冲击下多尺度力学响应的系统原位研究尚未见报道。在这里，完整的动态变形和裂纹的演化过程中，使用相结合的快速二维X射线成像和高分辨率的非原位层析成像的弹丸撞击的指状体。结果表明，在动态加载条件下，不同的水化状态会导致不同的韧性机制。一个以前未报告的三维联锁结构设计的影响表面和影响区域的报告使用纳米X射线断层扫描。实验结果和动态有限元建模表明，这种独特的结构在抵抗灾难性结构损坏和阻碍裂纹扩展方面发挥着重要作用。这项工作有助于理解生物材料的关键增韧策略，并为仿生制造抗冲击材料提供了有价值的信息。
Multiscale structural and mechanical characterization of stomatopod cuticle under in situ spherical projectile penetrating loadings. In this work the full dynamic crack evolutionary process and other toughening mechanisms inside the dactyl club under high-speed impact were uncovered. The structure and mechanical properties of the stomatopod dactyl club have been studied extensively for its extreme impact tolerance, but a systematic in situ investigation on the multiscale mechanical responses under high-speed impact has not been reported. Here the full dynamic deformation and crack evolution process within projectile-impacted dactyl using combined fast 2D X-ray imaging and high-resolution ex situ tomography are revealed. The results show that hydration states can lead to significantly different toughening mechanisms inside dactyl under dynamic loading. A previously unreported 3D interlocking structural design in the impact surface and impact region is reported using nano X-ray tomography. Experimental results and dynamic finite-element modeling suggest this unique structure plays an important role in resisting catastrophic structural damage and hindering crack propagation. This work is a contribution to understanding the key toughening strategies of biological materials and provides valuable information for biomimetic manufacturing of impact-resistant materials in general.