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Flexible Piezoelectric Nanocomposite Energy Harvester for Extreme Temperature Applications
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| 자료유형 | 학위논문 |
|---|---|
| 서명/저자사항 | Flexible Piezoelectric Nanocomposite Energy Harvester for Extreme Temperature Applications. |
| 개인저자 | Nafari, Alireza. |
| 단체저자명 | University of Michigan. Aerospace Engineering. |
| 발행사항 | [S.l.]: University of Michigan., 2019. |
| 발행사항 | Ann Arbor: ProQuest Dissertations & Theses, 2019. |
| 형태사항 | 178 p. |
| 기본자료 저록 | Dissertations Abstracts International 81-05B. Dissertation Abstract International |
| ISBN | 9781687998200 |
| 학위논문주기 | Thesis (Ph.D.)--University of Michigan, 2019. |
| 일반주기 |
Source: Dissertations Abstracts International, Volume: 81-05, Section: B.
Advisor: Sodano, Henry. |
| 이용제한사항 | This item must not be sold to any third party vendors.This item must not be added to any third party search indexes. |
| 요약 | Piezoelectric materials are currently among the most promising building blocks for sensing, actuation and energy harvesting systems. However, these materials are limited in many applications due to their lack of machinability as well as their inability to conform to curved surfaces. One method to mitigate this issue is through additive manufacturing (direct printing) of piezoelectric nanocomposites, where piezoelectric nanomaterials are embedded in a polymer matrix. With the advent of additive manufacturing it is now possible to realize directly printed nanocomposites with tailored microstructure. Although significant progress has been made in this area, parameters such as filler morphology, alignment and volume fraction are critical aspects that heavily influence the nanocomposites' electromechanical response and have not been adequately modeled.A primary objective of this study is to develop and experimentally validate micromechanical and finite element models that allow the study of the electroelastic properties of a directly printed nanocomposite containing piezoelectric inclusions. Furthermore, the dependence of these properties on geometrical features such as aspect ratio and active phase alignment are investigated. In particular, the core focus of this work is to demonstrate how the alignment of piezoelectric nanowires in the nanocomposite starting from randomly oriented to purely aligned can improve the electroelastic properties of a printed nanocomposite. This work provides the first experimental validation of theoretical and FEM models through measurement of the electroelastic properties of the nanocomposites containing piezoelectric nanowires inside a polymeric matrix. Moreover, this dissertation presents a novel approach for harvesting ambient mechanical energy at extreme environments. Many miniature electronic sensors and actuators in aerospace applications risk breakdown due to their operation in extreme temperature conditions, as cooling and protecting them prove to be challenging due to space and weight limitations. Therefore, as the second objective of this investigation, a flexible energy harvester capable of withstanding extreme temperatures (< 250 째C) is developed using a direct write approach that can provide useful electrical energy from ambient vibrations. The research presented in this dissertation can provide a robust tool for the analysis and design of two-phase piezoelectric nanocomposite energy harvesters able to operate under a spectrum of conditions ranging from ambient to extreme temperatures. |
| 일반주제명 | Materials science. Aerospace engineering. Mechanical engineering. |
| 언어 | 영어 |
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