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首页> 外文期刊>Bioengineered >Nanoindentation investigation of the stress exponent for the creep of dung beetle (Copris ochus Motschulsky) cuticle
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Nanoindentation investigation of the stress exponent for the creep of dung beetle (Copris ochus Motschulsky) cuticle

机译：be虫表皮蠕变应力指数的纳米压痕研究

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ABSTACTWith the rapid development of bionic science, especially the progress that has been made in the fields of biomaterials and biomimetics, there is now great interest in the surface and internal mechanical properties of biological materials at the micro- and nanoscale. The study of micro- and nanoscale biomaterial mechanical properties could enable interdisciplinary applications in materials science, biological science and bionic science. Dung beetle (Copris ochus Motschulsky) cuticle is a viscoelastic material that is both viscous and flexible via elastic deformation under external forces; where stress σ, strain ? and elastic modulus E are related in the following way: σ = E ?. In addition, as σ is related to the rate of strain, time is also a factor. The stress-strain relationships of various parts of dung beetle cuticle were investigated in this paper. As time increased, the stress and strain of the material were found to decrease and increase, respectively, indicating that when the material was indented for a certain period, the interaction force between the indenter and the material gradually achieved a state of dynamic equilibrium. However, strain continued to occur until reaching a point of equilibrium because of the creep phenomenon. The stress-strain curves showed a strong character in each holding time condition: the longer the holding time, the more flattened the stress-strain curve. These findings will be useful in the advanced design of strong, lightweight, and biomimetic composites.
机译：摘要随着仿生科学的飞速发展，特别是在生物材料和仿生材料领域取得的进步，现在人们对微米级和纳米级生物材料的表面和内部机械性能表现出极大的兴趣。对微米和纳米级生物材料力学性能的研究可以使跨学科应用在材料科学，生物科学和仿生科学中。粪甲虫（Copris ochus Motschulsky）表皮是一种粘弹性材料，在外力作用下通过弹性变形既具有粘性又具有柔韧性。应力σ，应变在哪里？弹性模量与E的关系如下：σ＝E≥。另外，由于σ与应变率有关，所以时间也是一个因素。研究了甲虫角质层不同部位的应力-应变关系。随着时间的增加，发现材料的应力和应变分别减小和增加，这表明当将材料压入一定时间后，压头和材料之间的相互作用力逐渐达到动态平衡状态。然而，由于蠕变现象，应变持续发生直到达到平衡点。应力-应变曲线在每种保持时间条件下均表现出很强的特性：保持时间越长，应力-应变曲线越平坦。这些发现将对坚固，轻巧和仿生复合材料的高级设计有用。

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