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Effect of interlocking structure on mechanical properties of bio-inspired nacreous composites

机译：互锁结构对生物启发珍珠合复合材料力学性能的影响

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摘要

As a biological material, nacre has attracted more and more attention because of its remarkable mechanical properties, which were generally attributed to the staggered "brick and mortar" structure. Recently, topological interlocking was believed to be one of the key mechanisms for the high toughness and strength of nacre. This paper aims at evaluating the mechanical behaviors of nacreous composites with interlocking structures, by a combination of analytical solution and numerical simulation. The elastic modulus, tensile strength and toughness of the composites are obtained as functions of the geometrical parameters, which are related to the waviness of the tablet. It is found that the elastic modulus of the nacreous composites increases with the increasing of tablet waviness, and there exists a critical angle for the interlocking structure where both high strength and toughness can be achieved. Furthermore, finite element analysis (FEA) shows that the interlocking angle of the tablets plays an important role in the brittle-to-ductile transition of the composites, and good agreement is obtained between the theoretical solutions and simulations. The results can potentially provide a guideline to the design and optimization of bio-inspired composites with interlocking structures.
机译：作为一种生物材料，由于其卓越的机械性能，纳卡人越来越受到关注，这通常归因于交错的“砖和砂浆”结构。最近，拓扑互锁被认为是珍珠土高韧性和强度的关键机制之一。本文旨在通过分析解决方案和数值模拟的组合来评估用互锁结构的褐煤复合材料的机械行为。作为几何参数的功能，获得复合材料的弹性模量，抗拉强度和韧性，其与片剂的波纹有关。结果发现，褐色复合材料的弹性模量随着片剂波纹的增加而增加，并且可以实现互锁结构的临界角，其中可以实现高强度和韧性。此外，有限元分析（FEA）表明片剂的互锁角度在复合材料的脆性转变中起重要作用，并且在理论溶液和模拟之间获得了良好的一致性。结果可以潜在地提供具有互锁结构的生物启发复合材料的设计和优化的指导。

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