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Structural and Molecular Design, Characterization and Deformation of 3D Printed Mechanical Metamaterials

Wu, Siqi
http://rave.ohiolink.edu/etdc/view?acc_num=akron1605880414342785

Abstract Details

2020, Doctor of Philosophy, University of Akron, Polymer Science.
Mechanical metamaterials are artificial materials via rational geometries and structural design, which are usually composed of periodic arrangements of unit cells, to achieve the combinations of mechanical properties such as negative Poisson ratios, ultra-stiffness. The additive manufacturing technique provides the opportunity to fabricate the 3D design complex structure including the 3D lattice metamaterials in multiple scales from mm to μm length scale. Previously research was more focused on the metallic, ceramic-based metamaterials and manipulating the inherent mechanical properties. In this work, we carried out a series of experiments to study the mechanical properties of polymeric lattice metamaterials with structural and molecular design. We demonstrated the fabrication and mechanical behaviors of 3D BCC lattice structure under compressive deformation, showed the strength and stiffness vary as a function of the struts thickness and density, the strain localization and mechanism during nonlinear large deformation, and the inhomogeneous deformed with local defects design by using commercial 3D photocurable (methyl)acrylic base materials. Besides, we also developed functional smart materials to fabricate the smart metamaterials, manifesting the active metamaterials respond to external stimuli, demonstrating the novel shape memory effect with geometries and molecular design which is not found in the base material. Finally, we reported a thermo-responsive hydrogel lattice material.
Hunter King (Advisor)
Erol Sancaktar (Advisor)
Junpeng Wang (Committee Member)
Mesfin Tsige (Committee Member)
Kevin Cavicchi (Committee Member)
Shing-Chung Josh Wong (Committee Member)
150 p.
Materials Science; Mechanical Engineering; Polymers
Mechanical Metamaterials; Additive Manufacturing; Lattice Structure; Polymeric 3D printing; 4D printing

Recommended Citations

Citations

  • Wu, S. (2020). Structural and Molecular Design, Characterization and Deformation of 3D Printed Mechanical Metamaterials [Doctoral dissertation, University of Akron]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=akron1605880414342785

    APA Style (7th edition)

  • Wu, Siqi. Structural and Molecular Design, Characterization and Deformation of 3D Printed Mechanical Metamaterials. 2020. University of Akron, Doctoral dissertation. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=akron1605880414342785.

    MLA Style (8th edition)

  • Wu, Siqi. "Structural and Molecular Design, Characterization and Deformation of 3D Printed Mechanical Metamaterials." Doctoral dissertation, University of Akron, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=akron1605880414342785

    Chicago Manual of Style (17th edition)

akron1605880414342785
© 2020, all rights reserved.
This open access ETD is published by University of Akron and OhioLINK.