期刊
JOURNAL OF COMPARATIVE PHYSIOLOGY A-NEUROETHOLOGY SENSORY NEURAL AND BEHAVIORAL PHYSIOLOGY
卷 196, 期 9, 页码 659-668出版社
SPRINGER
DOI: 10.1007/s00359-010-0556-y
关键词
Effective elastic modulus; Nanoindentation; Gradient materials; Biological materials; Wear resistance
资金
- Federal Ministry of Education, Science and Technology, Germany (BMBF) [01RB0812A]
On the basis of structural data, it has been previously assumed that the integument of snakes consists of a hard, robust, inflexible outer surface (Oberhautchen and beta-layer) and soft, flexible inner layers (alpha-layers). The aim of this study was to compare material properties of the outer and inner scale layers of the exuvium of Gongylophis colubrinus, to relate the structure of the snake integument to its mechanical properties. The nanoindentation experiments have demonstrated that the outer scale layers are harder, and have a higher effective elastic modulus than the inner scale layers. The results obtained provide strong evidence about the presence of a gradient in the material properties of the snake integument. The possible functional significance of this gradient is discussed here as a feature minimizing damage to the integument during sliding locomotion on an abrasive surface, such as sand.
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