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Thermal Shock Behavior of Open Cell Ceramic Foams

Published online by Cambridge University Press:  21 February 2011

Robert M. Orenstein ,
David J. Green  and
Albert E. Segall
Robert M. Orenstein
Affiliation:
General Electric Company, Power Generation Engineering, 1 River Rd., Schenectady, NY 12345
David J. Green
Affiliation:
The Pennsylvania State University, Department of Materials Science and Engineering, University Park, PA 16802
Albert E. Segall
Affiliation:
Center for Advanced Materials, 410 Walker Bldg., University Park, PA 16802
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Abstract

Specimens of heated alumina foams were thermally shocked by immersion in water or oil. Two distinct temperature profiles were found to exist during liquid quenching: a macroscopic gradient due to heating of the fluid during infiltration into the foam and a microscopic gradient across each individual strut. Thermal stresses were calculated using a semi-empirical, finite element model. The peak thermal stresses were coupled with the two-parameter Weibull distribution of the strut strengths to calculate the probability of crack extension on a strut for eight cellular geometries. Experimentally, the thermal shock resistance increased with increasing relative density and increasing cell size. The predicted critical temperature differences were in fair agreement with measured values.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 207: Symposium I – Mechanical Properties of Porous and Cellular Materials , 1990 , 27
Copyright
Copyright © Materials Research Society 1991

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References

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