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Temperature and Microstructures Dependent Thermal Shock Resistance Models for Ultra-High-Temperature Ceramics Considering Effect of Residual Stress

Published online by Cambridge University Press:  08 August 2013

R. Z. Wang ,
S. G. Ai ,
W. G. Li ,
J. Zheng  and
C. Z. Zhang
R. Z. Wang
Affiliation:
State Key Laboratory of Coal Mine Disaster Dynamics and Control, College of Resources and Environment Science, Chongqing University, Chongqing, China
S. G. Ai
Affiliation:
LTCS and College of Engineering, Peking University, Beijing, China
W. G. Li*
Affiliation:
State Key Laboratory of Coal Mine Disaster Dynamics and Control, College of Resources and Environment Science, Chongqing University, Chongqing, China Department of Civil Engineering, University of Siegen, Siegen, Germany
J. Zheng
Affiliation:
State Key Laboratory of Coal Mine Disaster Dynamics and Control, College of Resources and Environment Science, Chongqing University, Chongqing, China
C. Z. Zhang
Affiliation:
LTCS and College of Engineering, Peking University Beijing, China
*
*wgli@cqu.edu.cn
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Abstract

Based on the researches on the temperature and microstructures dependent fracture strength and temperature dependent thermal shock resistance, the new thermal shock resistance models for ultra-high-temperature ceramics were proposed. The effect of density on the fracture strength of material was investigated. A damage term was introduced to reveal the effects of uncertain factors on fracture strength. The roles of residual stress and microstructure sizes at different initial thermal shock temperatures in the thermal shock resistance were studied using the models. The study showed that the models can reveal the relationships among the residual stress, microstructure sizes and the temperature dependent thermal shock resistance well. The better thermal shock resistance is found for ultra-high-temperature ceramics having small SiC grains and relatively large micro-cracks around SiC grains. Large enhancement in thermal shock resistance can be achieved through our studies.

Keywords

Ultra-high-temperature ceramicsResidual stressMicrostructuresThermal shock resistance
Type
Research Article
Information
Journal of Mechanics , Volume 29 , Issue 4 , December 2013 , pp. 695 - 702
Copyright
Copyright © The Society of Theoretical and Applied Mechanics, R.O.C. 2013 

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References

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