Microstructure and mechanical properties of fish scales from MegalopsAtlanticus

S. Gil, E. A. Ossa
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Abstract

This work studies the microstructure and mechanical properties of fish scales from Tarpon fish (MegalopsAtlanticus) with cycloid scales. Mechanical properties of the scales were evaluated in uniaxial tension from three different positions along the length of the fish (head, mid-length and tail), similarly it was evaluated the effects of dehydration of the material in the mechanical properties, demonstrating an increased stiffness as a function of dehydration also reported Garrano et al. for CyprinusCarpio [1]. Microstructural analysis revealed that the scale is composed by different layers associated with collagen to form a plywood like structure and a top layer associated with hydroxyapatite, as it has just been reported by several authors to different fish species [2 , 3, 4]. This combination of collagen and hydroxyapatite layers allows the fish scale to have a high penetration resistance [5]. Microstructural analysis also reveals that the scale have a rugged circular concentric pattern on top to provide advantages associated with hydrodynamic, unlike the inner part of the scale that is in contact with the dermis which presents a smooth surface. Thus all these microstructural and mechanical characteristics are used by fish as drag reduction system, mobility and increase protection against predators, which are desirable features in engineering applications through the design of bioinspired materials.
大鳞鱼鳞的微观结构和力学性能
本文对具有摆线鳞的海鲢鱼鳞的微观结构和力学性能进行了研究。在单轴拉伸下,从鱼的三个不同位置(头部、中长和尾部)评估鱼鳞的机械性能,同样地,评估材料脱水对机械性能的影响,Garrano等人也报道了CyprinusCarpio的脱水作用,表明刚度增加[1]。显微结构分析显示,鳞片由胶原蛋白相关的不同层组成,形成胶合板状结构,顶层与羟基磷灰石相关,正如刚刚有几位作者在不同鱼类中报道的那样[2,3,4]。胶原蛋白和羟基磷灰石层的结合使鱼鳞具有很高的抗渗透能力[5]。微观结构分析也表明,鳞片顶部有一个坚固的圆形同心图案,提供与流体动力学相关的优势,不像鳞片的内部部分与真皮接触,呈现光滑的表面。因此,所有这些微观结构和机械特性都被鱼类用作减阻系统,机动性和增加对捕食者的保护,这是通过设计生物灵感材料在工程应用中的理想特征。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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