Date of Award

Summer 8-2022

Document Type

Dissertation

Degree Name

Doctor of Philosophy (PhD)

Department

Mechanical & Aerospace Engineering

Program/Concentration

Mechanical Engineering

Committee Director

Oleksandr G. Kravchenko

Committee Member

Miltos Kotinis

Committee Member

Gene Hou

Committee Member

Vukica Jovanovic

Committee Member

Diego Pedrazzoli

Abstract

Multiscale material systems derive their effective mechanical properties through a hierarchical organization of their structural elements and components. The hierarchy of a material is related to its effective properties, material processing, and composition. The hierarchy can be defined as an identifiable structural component with a specific size scale, such as the individual fibers collimated into platelets arranged randomly and producing a complex composite system or the lamellar structure in freeze-casted ceramic with the variation of in-plane orientation. In this study, the role of the structural hierarchy on the effective mechanical response and failure behavior of three complex material systems was studied, (i) long discontinuous glass fiber reinforced Nylon composite, (ii) prepreg platelet molded composite (PPMC), and (iii) freeze-casted porous alumina ceramic. Progressive failure analysis (PFA) was used to study the damage propagation up to ultimate failure. The developed computational models provided an understanding of how the material's morphology defines the variability of effective mechanical properties (modulus and strength) and the failure behavior.

DOI

10.25777/xh7r-g449

ISBN

9798351481609

ORCID

0000-0001-5175-8696

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