Uniaxial Compressive Response of Ice-Templated Ceramics with Directional Porosity: Effects of Porosity, Morphology and Strain Rate
Batten College of Engineering & Technology
Ph.D. Engineering - Mechanical Engineering
Due to high specific strength and energy absorption capacity, ice-templated ceramics with directional porosity are promising materials for nuclear warheads, armor systems, anti-mining, and impact protection. In these applications, materials are often subjected to mechanical forces within loading durations of tens of microseconds. Therefore, mechanical response of ice-templated ceramics measured in quasistatic regime may not truly represent their dynamic (high-strain rate) mechanical behavior. In this presentation, we will discuss our work on understanding the uniaxial compressive response of ice-templated sintered ceramics both in the quasistatic and dynamic regimes of strain rates. We utilized ice-templated alumina as a model system and employed a split-Hopkinson pressure bar (SHPB) to measure the uniaxial dynamic compressive response. In the processed ice-templated ceramics, porosity, lamellar bridge density, microstructural morphology and other length-scale features were modified through the systematic variations of the intrinsic (solids loading of suspension, particle size and morphology) and extrinsic (freezing front velocity) variables. This study will help to decipher the effects of porosity, pore morphology and length-scale features on the compressive mechanical response of ice-templated ceramics at two widely different strain rate regimes.
Banda, Mahesh; Ghosh, Dipankar; John, James E.; and Terrones, Diego A., "Uniaxial Compressive Response of Ice-Templated Ceramics with Directional Porosity: Effects of Porosity, Morphology and Strain Rate" (2019). College of Engineering & Technology (Batten) Posters. 4.