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Presentation
Reversible strain in Ni-Mn-Ga with collinear field and stress
Ames Laboratory Conference Papers, Posters, and Presentations
  • LeAnn E. Faidley, Ohio State University
  • Marcelo J. Dapino, Ohio State University
  • Gregory N. Washington, Ohio State University
  • Thomas A. Lograsso, Iowa State University
Document Type
Conference Proceeding
Conference
Smart Structures and Materials 2005: Active Materials: Behavior and Mechanics
Publication Date
5-20-2005
DOI
10.1117/12.600210
Geolocation
(32.7153292, -117.15725509999999)
Abstract

Our previous work on ferromagnetic shape memory Ni50Mn28.7Ga21.3 demonstrates reversible compressive strains of -4100 microstrain along the [001] direction under the application of a magnetic field also along the [001] direction with no external orthogonal restoring force. The reversibility of the strains is due to internal bias stresses oriented orthogonal to the field. These results show promise for the use of Ni-Mn-Ga as the core material in solenoid transducers. In this paper, the reversible strains are explained by considering pinning sites as the source of the internal bias stresses in the material. Following prior work by Kiefer and Lagoudas, a phenomenological model is constructed for the motion of twin variants in the presence of an orthogonal pair formed by a magnetic field and an internal bias stress. The model is formulated by considering the Zeeman, elastic, and pinning energies, from which an appropriate Gibbs energy function is constructed. Minimization of the Gibbs function then yields a constitutive model for the strain. The accuracy of this model is studied and its implementation as a hysteresis kernel in homogenization theories is discussed.

Comments

This article is from Smart Structures and Materials 2005: Active Materials: Behavior and Mechanics 5761 (2005): p. 501, doi:10.1117/12.600210

Copyright 2005 Society of Photo Optical Instrumentation Engineers. One print or electronic copy may be made for personal use only. Systematic reproduction and distribution, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper are prohibited.

http://dx.doi.org/10.1117/12.600210

Copyright Owner
Society of Photo Optical Instrumentation Engineers
Language
en
Citation Information
LeAnn E. Faidley, Marcelo J. Dapino, Gregory N. Washington and Thomas A. Lograsso. "Reversible strain in Ni-Mn-Ga with collinear field and stress" San Diego, CA(2005)
Available at: http://works.bepress.com/thomas_lograsso/215/