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Three-Dimensional Finite Element Modeling of Multilayered Multiferroic Composites

Wang, Ruifeng
http://rave.ohiolink.edu/etdc/view?acc_num=akron1311365854

Abstract Details

2011, Doctor of Philosophy, University of Akron, Civil Engineering.
Multiferroic composites are materials containing both a ferroelectric phase which exhibits the piezoelectric property, and a ferromagnetic phase which exhibits the magnetostrictive property. A piezoelectric material displays a coupling effect between mechanical and electric fields and a magnetostrictive material displays coupling effect between mechanical and magnetic fields. Although neither of the two phases displays coupling between electric and magnetic fields, when they are bonded together, the electric and magnetic phases become indirectly coupled through mechanical strain, leading to a magnetoelectric (ME) coupling effect. Some single-phase materials have been found to display this kind of property as well. However, the detected coupling effects in all the single-phase materials are very weak, and it is difficult to develop useful applications. It is discovered that bonding piezoelectric (PE) and magnetostrictive (MS) phases within single materials can achieve a dramatically higher ME effect than that of a single-phase material. This implies a bright prospect of applications for this kind of composites which can be applied in developing useful ME devices and contributing to the development of Micro-electromechanical Systems (MEMS). In this study, both an in-house finite element code and an ABAQUS UEL subroutine have been developed to model the multiferroic composites. Several important issues on multiferroic multilayered composites have been addressed: (1) by static simulation of a bi-layered multiferroic composite, the effect of geometric aspect ratios, mechanical boundary conditions and phase volume ratios on ME coupling have been discussed in detail; it is shown that ME effect can be enhanced by properly adjusting the mechanical BCs, the lateral size of the composite and volume ratios of the two phases; (2) a three-layered multiferroic composite with the top and bottom layers being designed as the functionally graded material (FGM) and the middle layer as a homogeneous material has been modeled and its full-field solutions have been presented as benchmark results; (3) the time-domain and frequency-domain ME effects have been solved, respectively, by transient and steady-state simulations of a bi-layered model. The transient results show that dynamic ME coupling effect is related to the time duration of the input signal and the steady-state results show that the ME coupling effect reaches a high peak when the frequencies of input signals are around the natural frequencies of the composite.
Ernian Pan, Dr. (Advisor)
Wieslaw Binienda, Dr. (Committee Member)
Gunjin Yun, Dr. (Committee Member)
Xiaosheng Gao, Dr. (Committee Member)
Kevin Kreider, Dr. (Committee Member)
106 p.
Civil Engineering; Engineering; Materials Science; Mechanical Engineering
Finite Element; Multiferroic; Magnetoelectric Effect; Piezoelectric; Multilayered Composite; Functionally Graded Material; ABAQUS UEL;

Recommended Citations

Citations

  • Wang, R. (2011). Three-Dimensional Finite Element Modeling of Multilayered Multiferroic Composites [Doctoral dissertation, University of Akron]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=akron1311365854

    APA Style (7th edition)

  • Wang, Ruifeng. Three-Dimensional Finite Element Modeling of Multilayered Multiferroic Composites. 2011. University of Akron, Doctoral dissertation. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=akron1311365854.

    MLA Style (8th edition)

  • Wang, Ruifeng. "Three-Dimensional Finite Element Modeling of Multilayered Multiferroic Composites." Doctoral dissertation, University of Akron, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=akron1311365854

    Chicago Manual of Style (17th edition)

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This open access ETD is published by University of Akron and OhioLINK.