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Title: Dynamic fragmentation of cellular, ice-templated alumina scaffolds

Abstract

Here, 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.

Authors:
 [1];  [2];  [1];  [2];  [1]
  1. Naval Postgraduate School, Monterey, CA (United States)
  2. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Publication Date:
Research Org.:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1410071
Report Number(s):
LLNL-JRNL-737610
Journal ID: ISSN 0021-8979
Grant/Contract Number:  
AC52-07NA27344
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Journal of Applied Physics
Additional Journal Information:
Journal Volume: 119; Journal Issue: 2; Journal ID: ISSN 0021-8979
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE

Citation Formats

Tan, Yi Ming, Cervantes, Octavio, Nam, SeanWoo, Molitoris, John D., and Hooper, Joseph P. Dynamic fragmentation of cellular, ice-templated alumina scaffolds. United States: N. p., 2016. Web. doi:10.1063/1.4939702.
Tan, Yi Ming, Cervantes, Octavio, Nam, SeanWoo, Molitoris, John D., & Hooper, Joseph P. Dynamic fragmentation of cellular, ice-templated alumina scaffolds. United States. doi:10.1063/1.4939702.
Tan, Yi Ming, Cervantes, Octavio, Nam, SeanWoo, Molitoris, John D., and Hooper, Joseph P. Fri . "Dynamic fragmentation of cellular, ice-templated alumina scaffolds". United States. doi:10.1063/1.4939702. https://www.osti.gov/servlets/purl/1410071.
@article{osti_1410071,
title = {Dynamic fragmentation of cellular, ice-templated alumina scaffolds},
author = {Tan, Yi Ming and Cervantes, Octavio and Nam, SeanWoo and Molitoris, John D. and Hooper, Joseph P.},
abstractNote = {Here, 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.},
doi = {10.1063/1.4939702},
journal = {Journal of Applied Physics},
number = 2,
volume = 119,
place = {United States},
year = {Fri Jan 08 00:00:00 EST 2016},
month = {Fri Jan 08 00:00:00 EST 2016}
}

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Works referenced in this record:

Local inertial effects in dynamic fragmentation
journal, January 1982

  • Grady, D. E.
  • Journal of Applied Physics, Vol. 53, Issue 1, p. 322-325
  • DOI: 10.1063/1.329934

Freeze-Casting of Porous Ceramics: A Review of Current Achievements and Issues
journal, March 2008