Date of Award

Spring 2019

Document Type

Thesis

Degree Name

Master of Science (MS)

Department

Mechanical & Aerospace Engineering

Program/Concentration

Mechanical Engineering

Committee Director

Oleksandr Kravchenko

Committee Member

Dipankar Ghosh

Committee Member

Xiaoyu Zhang

Abstract

The off-axis compressive behavior of ice-templated ceramic was analyzed using experimental results and micro-mechanical model simulation. Ice-templated ceramics is a versatile processing technique used to manufacture anisotropic ceramic foam by exploiting the anisotropic growth characteristics and lamellar morphology. The ice-templating process results in processing-structure-property relationships determined by the microstructure. The processed alumina samples which were later manufactured by water jet machine from the freeze casting were tested under quasi-static off-axis loading conditions and were used to determine the mechanical properties of the material. Digital image correlation (DIC) was used to measure the strain response of ice-templated ceramic under off-axis loading. DIC results revealed non-homogenous strain distribution in the material during compression. Specifically, the origin of the localized strain concentration columnar regions, which are oriented in the ice-growth direction. Those regions were found to be the onset failure of in off-axis and 0-degree loading conditions. The experimental results reveal the strong influence of the loading direction on the compressive behavior of the ice-templated ceramic. A Representative Volume Element is developed to predict the behavior of off-axis loading. Micro-mechanical loading results in indicated that buckling of lamella walls were determined as the driving factor of failure. The results of the model compared favorably with the experimental results.

DOI

10.25777/dekj-kp24

ISBN

9781085635844

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