Mechanical modeling of a wrinkled fingertip immersed in water
Mechanical modeling of a wrinkled fingertip immersed in water
复制标题
DOI：
10.1016/j.actbio.2009.10.025
复制
发表时间：
2010-04-01
影响因子：
9.7
通讯作者：
Chen, Xi
中科院分区：
文献类型：
--
作者：
Yin, Jie;Gerling, Gregory J.;Chen, Xi
长时间接触水后，指尖经常会起皱。基本的力学问题，特别是控制褶皱形态的关键参数，通过使用有限元模拟和分析建模进行了研究。研究了指尖几何参数和材料参数变化时的起皱行为，包括起皱距离（波长）、起皱深度（振幅）和临界起皱应力/应变。一个简单的简化模型被用来理解手指曲率和皮肤厚度的影响，而一个更精细的完整解剖模型提供了分析多层皮肤结构的影响的基础。仿真结果表明，角质层和真皮层的刚度在皮肤中有很大的影响，这与分析预测吻合得很好。从揭示的力学原理，提出了有效减缓和抑制皮肤皱纹的潜在方法：其中，增加皮肤中真皮层的模量似乎是最有效的。(C)2009 Acta Materialia Inc.由爱思唯尔有限公司出版。保留所有权利。
Fingertips often wrinkle after extended exposure to water. The underlying mechanics issues, in particular the critical parameters governing the wrinkled morphology, are studied by using both finite element simulation and analytical modeling. The wrinkling behaviors, characterized by the wrinkle-to-wrinkle distance (wavelength), wrinkle depth (amplitude) and critical wrinkling stress/strain, are investigated as the geometry and material parameters of the fingertip are varied. A simple reduced model is employed to understand the effect of finger curvature and skin thickness, whereas a more refined full anatomical model provides the basis for analyzing the effect of a multilayered skin structure. The simulation results demonstrate that the stiffness of the stratum corneum and the dermal layer in the skin has a large effect on the wrinkling behavior, which agrees well with the analytical predictions. From the uncovered mechanical principles, potential ways for effectively slowing down and suppressing skin wrinkles are proposed: among them, increasing the modulus of the dermal layer in the skin appears to be the most effective. (C) 2009 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.