|About this Abstract
||Materials Science & Technology 2020
||Engineering Ceramics: Microstructures, Properties, and Applications
||Influence of Three-dimensional Microstructure on
the Impact Response of Advanced Ceramics
||Jonathan P. Ligda, Brendan Koch, Debjoy Mallick, David James Hogan
|On-Site Speaker (Planned)
Brittle materials fail due to pre-existing flaws serving as stress concentrators, causing cracks to grow and coalesce when loads are applied, leading to fragmentation. These flaws range from microscopic inclusions or grain boundaries to macroscopic cracks from prior loading. Before fragmentation these flaws also influence mechanical behavior such as apparent stiffness or Poisson’s ratio. Advanced ceramics manufacturing minimizes initial flaw populations, but extreme environments such as ballistic loading that can induce new flaws. Intentionally inducing damage produces complex internal structures that are characterized by computed x-ray tomography, scanning electron microscopy, energy-dispersive x-ray spectroscopy, and electron backscatter diffraction. Compressive loading to failure obtains the changes in material properties such as stiffness and Poisson’s ratio, and performance metrics such as failure strength. Impact experiments obtain physical performance, which can then be compared with performance metrics and characterization data to understand the relationships between physical damage and mechanical response of brittle material.