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Use of reference stress to correlate creep fracture lifetimes of monolithic ceramics in uniaxial tension and flexure
Ist Teil von
Materials science and technology, 1993-02, Vol.9 (2), p.151-154
Ort / Verlag
London, England: Taylor & Francis
Erscheinungsjahr
1993
Link zum Volltext
Quelle
Taylor & Francis Journals Auto-Holdings Collection
Beschreibungen/Notizen
Most of the very limited tensile creep information on monolithic ceramics has been generated using the four point bend test. Where data on ceramics under uniaxial tension do exist, it is invariably the case that lifetimes are much longer under flexure when, as is usual, the maximum principal tensile stress is used as the correlating parameter. In this paper, creep lifetime data for hot pressed silicon nitride are used to demonstrate that a geometry dependent 'reference stress' is a much superior correlating parameter and that its successful usage leads to important deductions about the process of fracture in this class of materials, under the stress and temperature regime studied.
MST/1668