Date Approved
6-25-2024
Embargo Period
6-25-2026
Document Type
Dissertation
Degree Name
Doctor of Philosophy (Ph.D.)
Department
Mechanical Engineering
College
Henry M. Rowan College of Engineering
Sponsor
NSF, NJ Health Foundation, U.S. Army Research Laboratory
Advisor
Behrad Koohbor, Ph.D.
Committee Member 1
Francis M. Haas, Ph.D.
Committee Member 2
Chen Shen, Ph.D.
Committee Member 3
Paromita Nath, Ph.D.
Committee Member 4
George Youssef, Ph.D.
Keywords
Auxetic; Energy Absorption; Functionally Graded Material; Metamaterial; Polymer
Subject(s)
Materials--Research; Additive Manufacturing; Foamed materials
Disciplines
Materials Science and Engineering | Mechanical Engineering
Abstract
This dissertation investigates the relationship between the structural design of cellular solids and their macroscopic behavior and focuses on the customization of properties through advanced fabrication techniques. The concepts of density gradation and their integration in both non-ordered and ordered cellular structures have been proposed. The investigation focuses on the development of functionally graded foam materials (FGFMs) and mechanical metamaterials to obtain tunable mechanical performance. One significant focus is the fabrication of density-graded foam stacks with various interface adhesives. From the insights gained from the study of interfaces in density-graded foams, certain design and fabrication principles are applied to enhance the design of shoe midsoles. Parallel to the exploration of non-ordered cellular structures, the investigations expand to include ordered cellular structures. A multiscale experimental approach is designed and utilized to investigate the mechanical response of axially loaded center-symmetric perforated structures with various geometric features. The strain-dependent Poisson’s ratios of uniform-density honeycombs are used as input to design hybrid honeycombs whose Poisson’s ratios remain near zero over broad strain spans. The implications of this work offer tangible solutions for protective equipment, particularly in the sports industry, through the development of cellular structure with tailorable properties.
Recommended Citation
Uddin, Kazi Zahir, "DESIGN, FABRICATION, AND CHARACTERIZATION OF MULTIFUNCTIONAL CELLULAR STRUCTURES FOR ENHANCED IMPACT ENERGY MITIGATION PERFORMANCE" (2024). Theses and Dissertations. 3257.
https://rdw.rowan.edu/etd/3257
