Thermomechanical Modeling and Experimentation for SMA Actuators under Cyclic Loading

Abstract

An experimentally validated thermomechanical actuation model for shape memory alloy (SMA) actuators undergoing non proportional cyclic loading, fully coupled with the evolution of plastic strains is developed. The model is numerically implemented in a form suitable for finite element analysis. Material characterization of SMA actuators is also performed in this research effort. Emphasis is given on the effect of plastic strains on the properties of SMA actuators. The data collected during the characterization is utilized to calibrate the thermomechanical SMA model. After the model is calibrated, different loading cases are investigated, including non-proportional loading paths. Finally, the fatigue life of SMA actuators is also investigated. A test frame for fatigue experiments is developed and numerous fatigue tests are performed.

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Document Details

Document Type
Technical Report
Publication Date
Jul 23, 2002
Accession Number
ADA405599

Entities

People

  • Dimitris C Lagoudas

Organizations

  • Texas A&M University

Tags

Communities of Interest

  • Air Platforms
  • Human Systems

DTIC Thesaurus Topics

  • Actuators
  • Annealing
  • Engineering
  • Fatigue Life
  • Fatigue Tests (Mechanics)
  • Finite Element Analysis
  • Heat Energy
  • Heat Treatment
  • Materials
  • Measurement
  • Mechanical Properties
  • Mechanics
  • Phase Transformations
  • Shape Memory Alloys
  • Students
  • Test Methods
  • Three Dimensional

Fields of Study

  • Physics

Readers

  • Computational Modeling and Simulation
  • Marine Propulsion Engineering and Naval Architecture
  • Mechanical Engineering/Mechanics of Materials.