ISSN: 1945-7553
CODEN: JTEVAB
Page Count: 8

Analysis of Gas-Fired Ceramic Radiant Tubes During Transient Heating: Part II—Thermoelastic Stress Analysis

Segall, AE
Research Engineer, Center for Advanced Materials, The Pennsylvania State University, University Park, PA

Hellmann, JR
Assistant Professor of Ceramic Science and Engineering and Assistant Director, Center for Advanced Materials, The Pennsylvania State University, University Park, PA

(Received 28 February 1991; accepted 22 July 1991)

Abstract

Transient radial and axial temperature distributions based on measured external surface temperatures and finite-element calculations were used with temperature dependent elastic material properties to determine the thermoelastic stresses experienced by reaction-bonded and sintered-alpha silicon-carbide open ended radiant tubes during gas-combustion beating. The resulting stresses exhibited a dependence on the radial temperature difference and the curvature of the axial temperature distribution. A failure rate analysis using a two-parameter Weibull formulation with a polyaxial stress approximation, the calculated surface and volume principal stresses, and temperature-dependent surface and volume Weibull strength data indicated low failure rates and the viability of both materials for the transient heating conditions studied.

Keywords:
ceramic, radiant tube, thermal transient, thermo-elastic, Weibull analysis

Paper ID: JTE11893J
DOI: 10.1520/JTE11893J
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