Barri, Kaveh
(2022)
Self-sensing and Self-powering Multifunctional Mechanical Metamaterials.
Doctoral Dissertation, University of Pittsburgh.
(Unpublished)
Abstract
There is an unmet need to explore new classes of active, scalable, and adaptive multifunctional materials for a broad range of engineering applications. Mechanical metamaterials are one of the major classes of the function-integrated materials. They gain their tailored counterintuitive mechanical properties from their rationally-designed structures rather than inheriting them directly from their chemical composition. Thus far, nearly all of the mainstream studies in the area of mechanical metamaterials have focused on identifying unprecedented mechanical properties via changing the geometrical design of micro/nano-architectures. In this dissertation, a new generation of multifunctional mechanical metamaterials called “meta-tribomaterials” is introduced by combining the fields of mechanical metamaterials and nano energy harvesting. The proposed concept enables creating active architected materials in which active sensing and energy harvesting are new types of material properties, alongside the traditional material properties. Meta-tribomaterials, a.k.a. self-aware composite mechanical metamaterials, are composed of rationally designed micro/nano structures with built-in contact-electrification mechanisms to realize such advanced functionalities. The term self-aware refers to the ability of a meta-tribomaterial system to self-sense and self-monitor its condition using its constituent components and without a need for any external power source. Theoretical and experimental studies are conducted to understand the mechanical and electrical behavior of 2D and 3D meta tribomaterial systems. The broad application of the proposed concept for designing multiscale artificial materials with novel functionalities is highlighted. Various self powering and self sensing structural systems and medical implants are developed including multifunctional implants with diagnostic functionality, shock absorbers, composite structural beams, and lightweight reinforced concrete systems. The maximum voltage and power output of the created meta tribomaterial systems reach 9 volts and 600 nW, respectively. Further discussions are provided to pave the way for enhancing the electrical and mechanical performance of the proposed designs using various material option and surface optimization techniques. Finally, a future vision toward creating truly autonomous architected materials is presented via incorporating information processing and data storage functionalities into the fabric of meta tribomaterials.
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Details
| Item Type: |
University of Pittsburgh ETD
|
| Status: |
Unpublished |
| Creators/Authors: |
|
| ETD Committee: |
|
| Date: |
6 September 2022 |
| Date Type: |
Publication |
| Defense Date: |
3 June 2022 |
| Approval Date: |
6 September 2022 |
| Submission Date: |
30 July 2022 |
| Access Restriction: |
1 year -- Restrict access to University of Pittsburgh for a period of 1 year. |
| Number of Pages: |
155 |
| Institution: |
University of Pittsburgh |
| Schools and Programs: |
Swanson School of Engineering > Civil and Environmental Engineering |
| Degree: |
PhD - Doctor of Philosophy |
| Thesis Type: |
Doctoral Dissertation |
| Refereed: |
Yes |
| Uncontrolled Keywords: |
Multifunctional Mechanical Metamaterials, Triboelectric Nanogenerator, Energy Harvesting, Sensors |
| Date Deposited: |
06 Sep 2023 05:00 |
| Last Modified: |
06 Sep 2023 05:15 |
| URI: |
http://d-scholarship.pitt.edu/id/eprint/43422 |
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