The Art of Curved Reinforcing in Biological Armors — Seashells
The Art of Curved Reinforcing in Biological Armors — Seashells
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DOI：
10.1007/s42235-019-0057-9
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发表时间：
2019-07
影响因子：
4
通讯作者：
Haoze Li;Xiaodong Li
中科院分区：
文献类型：
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作者：
Haoze Li;Xiaodong Li
贝壳，通常被称为大自然抵御掠夺性攻击的盔甲，一直是设计坚固耐用工程材料的灵感来源。以往对贝壳的研究主要集中在贝壳的壳体部位。均匀分布在贝壳尾部的海螺刺被普遍认为是装饰，使海螺壳成为艺术品。在这里，我们报告了一项新的发现，大自然使用不同于海螺身体部分的直的弯曲加强物来构建海螺脊椎，与海螺贝壳身体部分相比，海螺脊椎的断裂强度提高了30%。弯曲的薄片不仅赋予海螺刺金字塔形，还为贝壳增加了额外的屏蔽。在平衡状态下，曲线板结构所承受的载荷是直板结构的3倍。我们的发现揭示了大自然在建造贝壳方面的智慧，并为利用弯曲增强材料实现多功能和卓越的机械能力提供了额外的设计指南。
Seashells, commonly referred to as nature’s armors against predatory attacks, have been serving as the inspirations for designing strong and tough engineering materials. Previous studies on conch shells have been focused on the shell body parts. The conch spines which are evenly distributed at the tail of conch shell are generally accepted as the decoration, enabling conch shells as art pieces. Here we report a new finding that nature uses curved reinforcements, different from the straight ones in conch body parts, to construct conch spines which exhibit 30% increase in fracture strength compared to conch shell body parts. The curved lamellae not only endow conch spines with pyramid-shape but also add extra shielding to the shells. Under equilibrium state, the curved lamellar configuration withholds 3 times higher loading than the straight one. Our finding uncovered nature’s wisdom in constructing seashells and provides an additional design guideline for utilizing curved reinforcements to achieve multifunctionalities and superior mechanical prowess.