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AMO/QO Physics Seminar


"Advances in morphing structures using shape memory alloys as solid state actuators"


Dr. Dimitris Lagoudas
Aerospace Engineering, Texas A&M University

ABSTRACT 

Advances in actuation materials development over the past two decades have led into the availability of solid state actuators undergoing reversible phase transformations with stable performance over a large span of actuation ranges. Various compositions of intermetallic Shape Memory Alloys (SMA) have emerged as actuator materials capable of providing large deformations at high actuation loads with reasonable reliability and performance. This presentation will provide an overview of recent advances in the development of SMA, including high temperature and magnetic SMA. Different research areas will be outlined including thermomechanical and actuation characterization, constitutive modeling and numerical implementation using finite element analysis. The influence of cyclic reversible phase transformation on fracture and actuation fatigue will be discussed. Examples from SMA integration into morphing structures will be given, emphasizing design optimization approaches for maximum actuation performance. Finally, current challenges will be outlined and future directions for the use and integration of shape memory materials in smart structures will be proposed.


Tuesday, December 2, 2014
IQSE 578, 12:00 noon
Mitchell Physics Building


Institute for Quantum Science and Engineering
Texas A&M University

(Sandwiches, salad, and soda to be served at 11:30 a.m.)

Host: Dr. Marlan Scully