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Fully-Coupled Characterization of Thermo-Electro-Magneto-Mechanical Materials

Piratla, Sarvani
http://rave.ohiolink.edu/etdc/view?acc_num=osu1243875108

Abstract Details

2009, Master of Science, Ohio State University, Mechanical Engineering.
Smart materials exhibit powerful nonlinear 3D coupling and anisotropy. However, the design and associated models, experimental characterization, and control design of smart systems are in general 1D. This reduced framework severely limits applications to 1D. The research presented here enables the tailoring of composition and processing to produce multifunctional materials with targeted performance properties that are fully nonlinear and 3D. A complete combinatorial analysis of seventy-two possible energy functions and state variables that describe 3D, nonlinear, coupled behavior of thermo-electro-magneto-mechanical materials is created. Each set of state variables and corresponding energy function correlates with a given set of experiments, the independent variables being controlled and the dependent variables being the measured responses. The constitutive equations with respect to each of these energy functions are derived in a systematic way by combining the mesoscale Maxwell equations, the balance laws of mechanics, and the balance law of entropy. The application of this framework to a new class of magnetostrictive Iron-Gallium alloys (Galfenol) is investigated with the intent to implement these alloys in a new class of fuel injectors to achieve unprecedented dynamic response and performance. The possibility of determining the full 3D constitutive behavior of Galfenol from simple, 1D macroscopic experiments in combination with analytical models based on knowledge of the crystal structure is explored. In this respect, a FEM formulation is presented.
Stephen Bechtel, PhD (Advisor)
Marcelo Dapino, PhD (Committee Member)
Joseph Heremans, PhD (Committee Member)
Materials Science

Recommended Citations

Citations

  • Piratla, S. (2009). Fully-Coupled Characterization of Thermo-Electro-Magneto-Mechanical Materials [Master's thesis, Ohio State University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=osu1243875108

    APA Style (7th edition)

  • Piratla, Sarvani. Fully-Coupled Characterization of Thermo-Electro-Magneto-Mechanical Materials. 2009. Ohio State University, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=osu1243875108.

    MLA Style (8th edition)

  • Piratla, Sarvani. "Fully-Coupled Characterization of Thermo-Electro-Magneto-Mechanical Materials." Master's thesis, Ohio State University, 2009. http://rave.ohiolink.edu/etdc/view?acc_num=osu1243875108

    Chicago Manual of Style (17th edition)

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© 2009, all rights reserved.
This open access ETD is published by The Ohio State University and OhioLINK.