Bounds for the dynamic modulus of unidirectional composites with bioinspired staggered distributions of platelets
Bounds for the dynamic modulus of unidirectional composites with bioinspired staggered distributions of platelets
复制标题
仿生血小板交错分布单向复合材料动态模量的界限
DOI：
10.1016/j.compstruct.2017.01.077
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发表时间：
2017-05
影响因子：
6.3
通讯作者：
Yongwei Zhang
中科院分区：
文献类型：
--
作者：
Mahan Qwamizadeh;Min Lin;Zuoqi Zhang;Kun Zhou;Yongwei Zhang
承载生物材料如骨、珍珠层和肌腱是具有抵抗静态和动态载荷的上级机械性能的生物复合材料，因此不仅为了理解结构-性能关系，而且为了开发新型仿生材料而被深入研究。在这里，一个理论框架的发展，以建立存储和损耗模量的生物启发交错复合材料的界限。首先通过有限元分析验证了边界。然后，该框架被用来研究的存储和损耗模量的仿生复合材料的变化对一系列的几何和组成材料的参数，包括分布，体积分数，和长宽比的矿物血小板，以及加载频率。以递归的方式，进一步扩展了具有多级结构层次的仿生复合材料的边界，并研究了结构层次的影响。结果表明，与其它结构体系相比，阶梯错层结构体系的粘弹性损失较大。本文中导出的边界不仅增加了对承载生物复合材料的阻尼行为的了解，而且还提供了一个有用的工具来估计和帮助设计生物启发复合材料的动态模量。
Load-bearing biological materials like bone, nacre and tendon are bio-composites with superior mechanical properties to resist static and dynamic loadings and thus have been intensively studied not only for understanding the structure-property relationship but also for developing novel bioinspired materials. Here a theoretical framework was developed to establish the bounds for the storage and loss moduli of the bioinspired staggered composites. The bounds were first verified by the finite element analysis. Then, the framework was utilized to study how the storage and loss moduli of the bioinspired composites vary against a series of geometrical and constituent material parameters including the distribution, volume fraction, and aspect ratio of the mineral platelets, as well as the loading frequency. In a recursive way, the bounds were further extended for bioinspired composites with multiple levels of structural hierarchy, and the effect of structural hierarchy was investigated. The results showed that, in comparison with other structural architectures, stairwise staggering structure generally gives higher loss viscoelasticity. The bounds derived in the present paper not only add insights into the damping behaviors of load-bearing biological composites but also provide a useful tool to estimate and help design the dynamic moduli of bio-inspired composites.
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