Dynamic fragmentation of cellular, ice-templated alumina scaffolds
Tan, Yi Ming
Molitoris, John D.
Hooper, Joseph P.
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We examine the dynamic failure of ice-templated freeze-cast alumina scaffolds that are being considered as biomimetic hierarchical structures. Three porosities of alumina freeze-cast structures were fabricated, and a systematic variation in microstructural properties such as lamellar width and thickness was observed with changing porosity. Dynamic impact tests were performed in a light-gas gun to examine the failure properties of these materials under high strain-rate loading. Nearly complete delamination was observed following impact, along with characteristic cracking across the lamellar width. Average fragment size decreases with increasing porosity, and a theoretical model was developed to explain this behavior based on microstructural changes. Using an energy balance between kinetic, strain, and surface energies within a single lamella, we are able to accurately predict the characteristic fragment size using only standard material properties of bulk alumina.
The article of record as published may be located at http://dx.doi.org/10.1063/1.4939702Yi Ming Tan, Octavio Cervantes, SeanWoo Nam, John D. Molitoris, and Joseph P. Hooper, "Dynamic fragmentation of cellular, ice-templated alumina scaffolds". Journal of Applied Physics, Volume 119, Issue 2(Received 9 November 2015; accepted 28 December 2015; published online 8 January 2016)
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