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Thermal Fracture of Ceramic Materials Under Quasi‐Static Thermal Stresses (Ring Test)
Author(s) -
BUESSEM W. R.,
BUSH E. A.
Publication year - 1955
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1955.tb14548.x
Subject(s) - temperature gradient , materials science , ceramic , composite material , thermal conductivity , fracture (geology) , thermal , porosity , yield (engineering) , thermodynamics , physics , quantum mechanics
The ring test consists in heating a pile of ceramic rings, each 2 in. in outside diameter, 1 in. in inside diameter, and 1½2 in. long, from the inside by a heating element and cooling it from the outside by a calorimetric chamber. The center rings of the pile have radial heat flow. The radial temperature gradient in these center rings can be measured and also the number of calories flowing through their unit surface area. Under equilibrium conditions these measurements yield the thermal conductivity of the ring material. The radial temperature gradient produces thermal stresses in the rings. If the gradient is increased slowly so as to maintain always approximate equilibrium conditions, there will be a maximum gradient which causes failure. The maximum gradient determined by thermal fracture and the thermal conductivity can be used to compute the two thermal stress resistivity constants, R and R 1 , of the material. R and R 1 have been determined for five ceramic materials: porous TiO 2 , dense TiO 2 , steatite, cordierite, and spodumene.