Centre for Innovative Structures and Materials, School of Engineering, RMIT University, GPO Box 2476, Melbourne, 3001, Australia.
School of Mechanical and Mechatronic Engineering, The University of Sydney, NSW, 2006, Australia.
J Mech Behav Biomed Mater. 2020 Dec;112:104107. doi: 10.1016/j.jmbbm.2020.104107. Epub 2020 Sep 21.
Numerical investigation into the impact-resistance of complex biological organs remains challenging because of the difficulties in obtaining accurate models and precise material properties. In this work, the elegance of a woodpecker's head, including a slender hyoid connected by a spherical hinge and two revolute hinges, a long upper beak, a short lower beak, and an encephalocoele filled with viscoelastic brain substances, was obtained via a reaction-diffusion based imaging process on the micro-CT data. The material heterogeneity was fully considered in subsequent finite element analysis in LS-Dyna via categorizing the intensity into 53 groups and interpolating their properties from available data of rhamphotheca, hyoid, skull, and beak. Compared to a non-hyoid model, we found the hyoid helps to significantly alleviate the strain in the brain and restrain opposite velocity for maintaining structural stability, especially after impact. Numerical investigation also indicates that a longer upper beak is favorable in flatting the curve of impact force and improve structural crashworthiness.
由于难以获得准确的模型和精确的材料特性，复杂生物器官的抗冲击性的数值研究仍然具有挑战性。在这项工作中，通过基于反应扩散的微 CT 数据成像过程，获得了啄木鸟头部的精致结构，包括通过球形铰链和两个转动铰链连接的细长舌骨、长上喙、短下喙以及充满粘弹性脑物质的脑腔。在随后的 LS-Dyna 有限元分析中，通过将强度分为 53 组并从鳞片状物、舌骨、头骨和喙的可用数据中插值其特性，充分考虑了材料的非均匀性。与非舌骨模型相比，我们发现舌骨有助于显著减轻大脑的应变并抑制相反的速度以保持结构稳定性，尤其是在冲击之后。数值研究还表明，较长的上喙有利于使冲击力曲线变平并提高结构耐撞性。
