Chin. Phys. Lett.  2010, Vol. 27 Issue (8): 088104    DOI: 10.1088/0256-307X/27/8/088104
CROSS-DISCIPLINARY PHYSICS AND RELATED AREAS OF SCIENCE AND TECHNOLOGY |
Critical Biot's number for Determination of the Sensitivity of Spherical Ceramics to Thermal Shock

LIU Qing-Nian1, MENG Song-He2, JIANG Chi-Ping3, SONG Fan1

1State Key Laboratory of Nonlinear Mechanics (LNM), Institute of Mechanics, Chinese Academy of Sciences, Beijing 100190 2Centre for Composite Materials, Harbin Institute of Technology, Harbin 150080 3Solid Mechanics Research Center, Beijing University of Aeronautics and Astronautics, Beijing 100191
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LIU Qing-Nian, MENG Song-He, JIANG Chi-Ping et al  2010 Chin. Phys. Lett. 27 088104
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Abstract

A critical Biot number, which determines both the sensitivity of spherical ceramics to quenching and the durations of the temperature-wave propagation and the thermal stresses in the ceramics subjected to thermal shock, is theoretically obtained. The results prove that once the Biot number of a ceramic sphere is greater than the critical number, its thermal shock failure will be such a rapid process that the failure only occurs in the initial regime of heat conduction, whereas the thermal shock failure of the ceramic sphere is uncertain in the course of heat conduction. The presented results provide a guide to the selection of the ceramics applied in the thermostructural engineering with thermal shock.

Keywords: 81.40.Np      44.10.+i      65.40.-b     
Received: 17 November 2009      Published: 28 July 2010
PACS:  81.40.Np (Fatigue, corrosion fatigue, embrittlement, cracking, fracture, and failure)  
  44.10.+i (Heat conduction)  
  65.40.-b (Thermal properties of crystalline solids)  
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https://cpl.iphy.ac.cn/10.1088/0256-307X/27/8/088104       OR      https://cpl.iphy.ac.cn/Y2010/V27/I8/088104
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LIU Qing-Nian
MENG Song-He
JIANG Chi-Ping
SONG Fan
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