感性材料与结构分析的基本模型  

Fundamental model for analysis of nastic materials and structures

作　　者：张洪武[1] 吕军[1] 

机构地区：[1]大连理工大学工业装备结构分析国家重点实验室运载工程与力学学部工程力学系,大连116024

出　　处：《计算力学学报》2010年第2期182-188,共7页Chinese Journal of Computational Mechanics

基　　金：国家自然科学基金(10721062;50679013;90715037;10728205);国家973项目(2010CB832704)资助项目

摘　　要：感性材料是一类基于植物仿生思想,利用化学能产生机械能的高能量密度智能材料。与植物感性运动类似,感性材料能够运用细胞半透膜,有选择、可控地将物质传输到体内产生定向变形。感性材料由基体材料中夹杂液体腔组成,液体腔周围有一层包含离子传输通道(离子泵、离子通道、离子协运机制等)的人工合成细胞膜。本文对感性材料的基本建模过程进行描述,建立了多感性驱动单元与结构相互作用的分析模型,并给出了计算结果。在感性单胞层次,通过对细胞膜离子传输过程以及结构力学模型进行耦合计算,再现感性运动中离子传输和基体结构的力学响应情况;通过改变各初始输入参数,研究不同参数对感性材料变形和响应过程的影响。Nastic actuators are high energy density active materials that mimic the processes used in the plant kingdom to produce large deformations through the conversion of chemical energy. These materials utilize the controlled transport of charge and fluid across a selectively-permeable membrane to achieve bulk deformation in a process of nastic movements found in plant. The nastic material being developed consists of synthetic membranes containing biological ion pumps, ion channels, and ion exchangers sur- rounding fluid-filled cavities embedded within a matrix. In this paper we represent the process of ion transporting and the responding of the matrix by discussing the formulation of a biological transport model and its coupling with a finite element model of the matrix of nastic materials. The sensitivities of various parameters on the deformation and the response time of the matrix are studied. Particular atten- tion is focused on the study of the mechanical behaviors of the structure composed of multi-cells of nastic materials. A coupled model is developed to simulate the mechanical response of nastic structure composed of multi-actuators.

关 键 词：感性材料 离子传输 耦合模型 多驱动单元 

分 类 号：TU473[建筑科学—结构工程]