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Structure and mechanical behaviors of protective armored pangolin scales and effects of hydration and orientation
Liu, Z. Q.; Jiao, D.; Weng, Z. Y.; Zhang, Z. F.; liuzq@imr.ac.cn; zhfzhang@imr.ac.cn
2016
发表期刊JOURNAL OF THE MECHANICAL BEHAVIOR OF BIOMEDICAL MATERIALS
ISSN1751-6161
卷号56页码:165-174
摘要As natural flexible dermal armor, pangolin scales provide effective protection against predatory threats and possess other notable properties such as anti-adhesion and wear resistance. In this study, the structure, mechanical properties, deformation and damage behaviors of pangolin scales were systematically investigated with the effects of hydration and orientation evaluated. The scales are divided into three macro-layers constituted by overlapping keratin tiles with distinct lamellar arrangements which are further composed of lower-ordered lamellae. Both hardness and strength are significantly decreased by hydration; while the plasticity is markedly improved concomitantly, and as such, the mechanical damages are mitigated. The tensile strength invariably approximates to one third of hardness in value. The tensile deformation is dominated by lamellae stretching and pulling out under wet condition, which is distinct from the trans-lamellar fracture in dry samples. The compressive behaviors are featured by pronounced plasticity in both dry and wet scales; and notable strain-hardening capacity is introduced by hydration, especially along the thickness direction wherein kinking occurs. Inter-lamellar cracking is effectively alleviated in wet samples compared with the dry ones and both of them deform by macroscopic buckling. This study may help stimulate possible inspiration for the design of high-performance synthetic armor materials by mimicking pangolin scales. (C) 2015 Elsevier Ltd. All rights reserved.
部门归属[liu, z. q. ; jiao, d. ; weng, z. y. ; zhang, z. f.] chinese acad sci, inst met res, shenyang natl lab mat sci, shenyang 110016, peoples r china
关键词Pangolin Scale Hierarchical Structure Mechanical Properties Hydration Orientation Bio-inspiration
资助者National Natural Science Foundation of China [51331007]; China Postdoctoral Science Foundation [2014M561263]
收录类别sci
语种英语
文献类型期刊论文
条目标识符http://ir.imr.ac.cn/handle/321006/75137
专题中国科学院金属研究所
通讯作者liuzq@imr.ac.cn; zhfzhang@imr.ac.cn
推荐引用方式
GB/T 7714
Liu, Z. Q.,Jiao, D.,Weng, Z. Y.,et al. Structure and mechanical behaviors of protective armored pangolin scales and effects of hydration and orientation[J]. JOURNAL OF THE MECHANICAL BEHAVIOR OF BIOMEDICAL MATERIALS,2016,56:165-174.
APA Liu, Z. Q.,Jiao, D.,Weng, Z. Y.,Zhang, Z. F.,liuzq@imr.ac.cn,&zhfzhang@imr.ac.cn.(2016).Structure and mechanical behaviors of protective armored pangolin scales and effects of hydration and orientation.JOURNAL OF THE MECHANICAL BEHAVIOR OF BIOMEDICAL MATERIALS,56,165-174.
MLA Liu, Z. Q.,et al."Structure and mechanical behaviors of protective armored pangolin scales and effects of hydration and orientation".JOURNAL OF THE MECHANICAL BEHAVIOR OF BIOMEDICAL MATERIALS 56(2016):165-174.
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