The development of compliant lightweight structures, which allow for controllable reconfigurations into various three-dimensional (3D) shapes, has many relevant applications in the fields of morphing air vehicles, deployable structures, flexible robots, medical devices, artificial implants, etc. Typical flexible structures are macroscopically compliant and lightweight so that it can easily be deformed by mechanical and non-mechanical external stimuli, such as thermal, electrical, optical, and chemical stimuli. Polymers are appealing for many flexible structures since they are lightweight and compliant, which can be easily fabricated and deformed into various shapes. One of the main characteristics of polymers is their viscoelastic behavior; thus, it might be necessary to incorporate the viscoelastic response in analyzing performance of compliant systems made of polymers.
Our aim is to understand the time-dependent response of polymers and their composites under coupled mechanical and non-mechanical effects, such as thermal and electrical stimuli. We first model the responses of various viscoelastic polymers under different temperatures and mechanical loadings. As many compliant systems comprise of several constituents, such as piezoelectric materials, that form active composites, we use micromechanics models for analyzing the overall performance of polymeric composites. Next, we integrate the constitutive models for polymers and other constituents to nonlinear kinematics of compliant structures in order to analyze deformations in various compliant systems. Several examples of time-dependent analyses of compliant systems, i.e., biodegradable polymeric stents and folding of thin sheets under thermal and electric field inputs will be shown.
Anastasia Muliana is an Associate Professor and Gulf Oil/Thomas A. Dietz Career Development Professor II in the Department of Mechanical Engineering at Texas A&M University. She received MSc and PhD degrees from Georgia Institute of Technology in 1999 and 2004, respectively. Her research interests include time-dependent modeling of polymers and composite materials, coupled mechanical and transport analyses in composites and smart structures, multi-scale modeling and large-scale nonlinear structural analysis, numerical methods. She is a recipient of NSF CAREER Award 2005, AFOSR YIP 2008, and PECASE 2009.
Date(s) - 04/29/2014
1122 Bainer Classroom