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Critical Evaluation of the Compression Creep Test
Author(s) -
Debschütz Klaus D.,
Caspers Bernhard,
Schneider Gerold A.,
Petzow Gunter
Publication year - 1993
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.1151-2916.1993.tb03968.x
Subject(s) - creep , materials science , stress (linguistics) , compression (physics) , composite material , isochoric process , stress relaxation , strain rate , exponent , thermodynamics , philosophy , linguistics , physics
The compression creep test is analyzed with respect to the friction at the loaded ends of the specimen. An analytical and a finite‐element solution performed for large deformations reveals that friction leads to a strain‐independent reduction of the creep rate which only depends on the stress exponent of the creep law and the geometry of the specimen. The assumed material behavior is a time‐dependent, isochoric, nonlinear viscosity. Compression creep tests on 3‐mol%‐yttria‐stabilized tetragonal zirconia polycrystals (3Y‐TZP) have been analyzed. The determination of a stress exponent corresponding to the decreasing stress state in the specimen during large deformations results in a higher resolution of the stress–strain‐rate relationship derived from a certain number of creep tests. For 3Y‐TZP the compression creep tests reveal a decreasing stress exponent with increasing stress.