Nonlinear elastic-viscoplastic constitutive equations for aging facial tissues
Nonlinear elastic-viscoplastic constitutive equations for aging facial tissues
复制标题
老化面部组织的非线性弹粘塑性本构方程
DOI：
10.1007/s10237-005-0074-y
复制
发表时间：
2005
影响因子：
3.5
通讯作者：
N. Binur
中科院分区：
文献类型：
--
作者：
Edoardo Mazza;O. Papes;M. Rubin;S. Bodner;N. Binur
本文报道了一个模拟衰老人脸的非线性力学行为的项目的初始阶段。面部结构的横截面被认为是由具有不同力学行为的多层组织组成的。这些组织的本构特性被合并到三维面部几何的有限元模型中。相对较短的时间(弹-粘塑性)行为由先前建立的与力学试验相一致的方程所控制。长时间反应由组织的老化弹性成分控制。引入了一种老化函数，该函数以简化的方式捕捉到由于应变历史以及其他生理和环境影响而观察到的这些老化弹性部件的刚度损失。计算了30年来暴露在引力下的情况。模拟渐进性重力软组织下降，认为这是面部衰老的主要标志。给出了软组织各层的变形和应力分布结果。
This paper reports on the initial stages of a project to simulate the nonlinear mechanical behavior of an aging human face. A cross-section of the facial structure is considered to consist of a multilayered composite of tissues with differing mechanical behavior. The constitutive properties of these tissues are incorporated into a finite element model of the three-dimensional facial geometry. Relatively short time (elastic-viscoplastic) behavior is governed by equations previously developed which are consistent with mechanical tests. The long time response is controlled by the aging elastic components of the tissues. An aging function is introduced which, in a simplified manner, captures the observed loss of stiffness of these aging elastic components due to the history of straining as well as other physiological and environmental influences. Calculations have been performed for 30 years of exposure to gravitational forces. Progressive gravimetric soft tissue descent is simulated, which is regarded as the main indication of facial aging. Results are presented for the deformations and stress distributions in the layers of the soft tissues.