Multiscale mechanical design of the lightweight, stiff, and damage-tolerant cuttlebone: A computational study
Multiscale mechanical design of the lightweight, stiff, and damage-tolerant cuttlebone: A computational study
复制标题
DOI：
10.1016/j.actbio.2022.09.057
复制
发表时间：
2022-12-07
影响因子：
9.7
通讯作者：
Li, Ling
中科院分区：
文献类型：
--
作者：
Lee, Edward;Jia, Zian;Li, Ling
乌贼骨是乌贼的内骨骼，为设计具有高刚度和损伤容限的低密度多孔陶瓷提供了一个有趣的生物结构模型。乌贼骨是高度多孔的（孔隙率-93%）和轻质的（密度小于海水的20%），主要由脆性文石（95wt%）构成，但能够维持超过20个大气压的静水压力，并且在压缩下表现出与许多金属泡沫相当的能量吸收能力（-4.4kJ/kg）。在这项工作中，我们计算研究如何使这种显着的机械效率是由多尺度结构的乌贼骨。使用常见的乌贼作为模型系统，我们首先进行了高分辨率同步加速器显微计算机断层扫描（mu-CT），并量化了乌贼骨的多尺度几何形状，包括单个壁的3D不对称形状，壁组装模式，以及整个乌贼骨壁的长距离结构梯度（约100%）。38个腔室）。获得的3D结构信息可以进行系统的有限元模拟，进一步揭示了乌贼骨的多尺度机械设计：在壁水平，壁的不对称性提供了优化的能量吸收，同时保持了高的结构刚度;在腔室水平，壁的变化（数量、图案和波纹幅度）有助于进行性损伤;在整个骨骼水平上，腔室高度的梯度调整乌贼骨的局部机械各向异性以减小应力集中。我们的研究结果为理解乌贼骨的多尺度力学设计提供了综合的见解，并为轻质蜂窝陶瓷的设计提供了有用的知识。重要性声明乌贼骨已被证明是一种生物陶瓷蜂窝材料，具有显著的轻质，高刚度和能量吸收。然而，我们的知识如何使这种机械性能的乌贼骨的多尺度结构是不完整的。在这里，我们结合联合收割机系统的断层扫描为基础的三维结构分析和有限元模拟，以揭示如何层次结构的乌贼骨在多个长度尺度协同有助于乌贼骨的令人印象深刻的机械效率。这些发现对设计仿生低密度多孔陶瓷材料具有重要意义。(c)2022 Acta Materialia Inc.由爱思唯尔有限公司出版。保留所有权利。
Cuttlebone, the endoskeleton of cuttlefish, offers an intriguing biological structural model for design-ing low-density cellular ceramics with high stiffness and damage tolerance. Cuttlebone is highly porous (porosity-93%) and lightweight (density less than 20% of seawater), constructed mainly by brittle arag-onite (95 wt%), but capable of sustaining hydrostatic water pressures over 20 atmospheres and exhibits energy absorption capability under compression comparable to many metallic foams (-4.4 kJ/kg). In this work, we computationally investigate how such remarkable mechanical efficiency is enabled by the mul-tiscale structure of cuttlebone. Using the common cuttlefish, Sepia Officinalis, as a model system, we first conducted high-resolution synchrotron micro-computed tomography (mu-CT) and quantified the cuttle-bone's multiscale geometry, including the 3D asymmetric shape of individual walls, the wall assembly patterns, and the long-range structural gradient of walls across the entire cuttlebone (ca . 38 chambers). The acquired 3D structural information enables systematic finite-element simulations, which further re-veal the multiscale mechanical design of cuttlebone: at the wall level, wall asymmetry provides opti-mized energy absorption while maintaining high structural stiffness; at the chamber level, variation of walls (number, pattern, and waviness amplitude) contributes to progressive damage; at the entire skele-tal level, the gradient of chamber heights tailors the local mechanical anisotropy of the cuttlebone for reduced stress concentration. Our results provide integrated insights into understanding the cuttlebone's multiscale mechanical design and provide useful knowledge for the designs of lightweight cellular ce-ramics.Statement of significance Cuttlebone has been demonstrated to be a biological ceramic cellular material with remarkable lightweight, high stiffness and energy absorption. However, our knowledge on how such mechanical properties are enabled by cuttlebone's multiscale structure is not complete. Here, we combine system-atic tomography-based 3D structural analysis and finite-element simulations to reveal how the hierarchi-cal structure of cuttlebone at multiple length scales synergistically contribute to cuttlebone's impressive mechanical efficiency. These findings have important implications for designing biomimetic low-density cellular ceramic materials.(c) 2022 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.