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Surface Loading on and Internal Defects in Layered Magneto-Electro-Elastic Materials and Structures

Sangghaleh, Ali
http://rave.ohiolink.edu/etdc/view?acc_num=akron1415290055

Abstract Details

2014, Doctor of Philosophy, University of Akron, Civil Engineering.
Magneto-electro-elastic (MEE) materials belong to the category of multi-phase materials where different phases within the materials including elastic, electric, and magnetic ones can interact for the optimal response. These materials are usually composites made of multi-phases or laminae and exhibit magnetoelectric (ME) coupling effect that is not present in the single-phase piezoelectric or piezomagnetic material. Piezoelectric materials display coupling effect between mechanical and electric fields and magnetostrictive materials display coupling effect between mechanical and magnetic fields. Material with an ME effect can exhibit an electric polarization under a magnetic field or a magnetization under an electric field. Natural ME effect is rare and the applications are limited due to the relatively small ME effect and response at low temperature. A few single-phase materials exhibit a weak ME effect. In contrast, a composite with piezoelectric and piezomagnetic phases can demonstrate a strong ME effect. The research on MEE materials started from 1970s and the development of MEEs picked up the pace since the production of high-quality single crystals as well as the improvement of techniques of thin film growth. Computational analyses have also helped to understand the coupling among elastic, electric, and magnetic orderings. In this study, new theoretical method is developed to understand the characteristics of anisotropic MEE materials under circular surface loadings. Numerical results demonstrate interesting features associated with different surface loads and could serve as benchmarks for future numerical methods where indentation research is involved. In addition, the analytical method is extended to analyze the fields produced by three-dimensional (3D) charged dislocations in MEE and piezoelectric (PE) bimaterials in which the materials are taken to be homogeneous and of general anisotropy. The solution is expressed in terms of simple line integrals along the dislocation loop with the integrand being the corresponding point-force Green’s functions. The solution contains the piezoelectric, piezomagnetic, and purely elastic responses as special cases. The presented analytical solution and the obtained numerical results will provide a brilliant prospect to understand mechanical and physical behaviors of layered materials/structures and to improve the design and fabrication of novel semiconductors and photovoltaic devices.
Ernian Pan, Dr. (Advisor)
Wieslaw Binienda, Dr. (Committee Member)
Gunjin Yun, Dr. (Committee Member)
Xiaosheng Gao, Dr. (Committee Member)
Tirumalai S. Srivatsan , Dr. (Committee Member)
Gerald Young, Dr. (Committee Member)
149 p.
Civil Engineering; Materials Science; Mechanics
Multiferroics; Defect; Charged dislocation; Layered Structures; Anisotropy

Recommended Citations

Citations

  • Sangghaleh, A. (2014). Surface Loading on and Internal Defects in Layered Magneto-Electro-Elastic Materials and Structures [Doctoral dissertation, University of Akron]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=akron1415290055

    APA Style (7th edition)

  • Sangghaleh, Ali. Surface Loading on and Internal Defects in Layered Magneto-Electro-Elastic Materials and Structures. 2014. University of Akron, Doctoral dissertation. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=akron1415290055.

    MLA Style (8th edition)

  • Sangghaleh, Ali. "Surface Loading on and Internal Defects in Layered Magneto-Electro-Elastic Materials and Structures." Doctoral dissertation, University of Akron, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=akron1415290055

    Chicago Manual of Style (17th edition)

akron1415290055
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This open access ETD is published by University of Akron and OhioLINK.