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Journal of Dynamic Behavior of Materials

, Volume 5, Issue 4, pp 463–483 | Cite as

Direct Observation of Failure in Ice-Templated Ceramics Under Dynamic and Quasistatic Compressive Loading Conditions

  • S. Akurati
  • Dipankar GhoshEmail author
  • M. Banda
  • D. A. Terrones
Research Paper
  • 62 Downloads

Abstract

The current study investigated the effects of porosity, microstructure, and strain rate regime on the damage evolution and failure behavior under uniaxial compressive loading conditions in ice-templated alumina materials. The compressive response was investigated in dynamic and quasistatic loading regimes. Microstructural analysis revealed that in the high porosity regime, morphology was lamellar. In the lower porosity materials processed at higher freezing front velocities (FFVs), morphology was dendritic but transitioned to lamellar structure with the decreasing FFV. Ice-templated materials with higher porosity exhibited progressive crushing type damage evolution, irrespective of the FFV and strain rate regime. The origin of progressive crushing type failure was observed to be the absence of macroscopic crack evolution in the vicinity of peak stress, and subsequent to peak stress damage evolved only in the form of minimal fragmentation that gradually increased with the increasing strain. However, at comparable strain, the extent of dynamic damage was less compared to quasistatic damage, which suggests enhanced resistance to brittle fracture at high-strain rates. With the decreasing porosity damage evolution process changed, particularly under quasistatic loading in the materials processed at higher FFVs. Up to peak stress materials were intact, whereas upon reaching peak stress significant damage evolved causing complete loss of compressive load-bearing capacity. Whereas, damage evolution under dynamic loading in the vicinity of peak stress was significantly limited and damage accumulated progressively with the increasing strain, which strongly suggests greater structural stability in the ice-templated porous ceramic materials at high-strain rates.

Keywords

Ice-templating Porosity Strain rate High-speed imaging Damage evolution Failure 

Notes

Acknowledgements

D.G. would like to acknowledge National Science Foundation supported S-STEM Grant (#1833896) for scholarship opportunity to D.A.T.

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Copyright information

© Society for Experimental Mechanics, Inc 2019

Authors and Affiliations

  • S. Akurati
    • 1
  • Dipankar Ghosh
    • 1
    Email author
  • M. Banda
    • 1
  • D. A. Terrones
    • 1
  1. 1.Department of Mechanical and Aerospace EngineeringOld Dominion UniversityNorfolkUSA

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