Hierarchical Structure Enhances and Tunes the Damping Behavior of Load-Bearing Biological Materials
Hierarchical Structure Enhances and Tunes the Damping Behavior of Load-Bearing Biological Materials
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分层结构增强和调节承载生物材料的阻尼行为
DOI：
10.1115/1.4032861
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发表时间：
2016-05
影响因子：
2.6
通讯作者：
Yong Wei Zhang
中科院分区：
文献类型：
--
作者：
Mahan Qwamizadeh;Pan Liu;Zuoqi Zhang;Kun Zhou;Yong Wei Zhang
贝壳和骨骼等承重生物材料最重要的功能之一是保护其内部器官免受外部动态冲击造成的损伤和断裂。然而，这类材料如何有效地阻尼穿过其结构的应力波仍然很大程度上未知。利用自相似层次模型，建立了研究承载生物材料阻尼性能与生物聚合物粘性特性、加载频率、增强体几何参数以及层次数关系的理论方法。研究发现，阻尼行为源于有机（生物聚合物）成分的粘性特性，并通过有机和无机成分的交错和分层组织得到极大的调节和增强。为了验证目的，还进行了有限元法（FEM）数值实验，结果与理论预测一致。此外，结果表明，对于自相似分层设计，对于特定的加载频率存在最佳的增强体纵横比，并且对于特定的增强体纵横比存在峰值加载频率，此时复合材料的阻尼能力最大化。我们的研究结果不仅为承重生物材料的应力波阻尼机制提供了宝贵的见解，而且还为设计用于防护应用的仿生合成复合材料提供了有用的指导。
One of the most crucial functionalities of load-bearing biological materials such as shell and bone is to protect their interior organs from damage and fracture arising from external dynamic impacts. However, how this class of materials effectively damp stress waves traveling through their structure is still largely unknown. With a self-similar hierarchical model, a theoretical approach was established to investigate the damping properties of load-bearing biological materials in relation to the biopolymer viscous characteristics, the loading frequency, the geometrical parameters of reinforcements, as well as the hierarchy number. It was found that the damping behavior originates from the viscous characteristics of the organic (biopolymer) constituents and is greatly tuned and enhanced by the staggered and hierarchical organization of the organic and inorganic constituents. For verification purpose, numerical experiments via finite-element method (FEM) have also been conducted and shown results consistent with the theoretical predictions. Furthermore, the results suggest that for the self-similar hierarchical design, there is an optimal aspect ratio of reinforcements for a specific loading frequency and a peak loading frequency for a specific aspect ratio of reinforcements, at which the damping capacity of the composite is maximized. Our findings not only add valuable insights into the stress wave damping mechanisms of load-bearing biological materials, but also provide useful guidelines for designing bioinspired synthetic composites for protective applications.
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