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Long‐Term Tensile Creep Testing for Advanced Ceramics
Author(s) -
Ohji Tatsuki,
Yamauchi Yukihiko
Publication year - 1992
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.1151-2916.1992.tb04503.x
Subject(s) - creep , materials science , ultimate tensile strength , silicon carbide , ceramic , bending , thermocouple , tensile testing , composite material , stress (linguistics) , machining , polishing , strain gauge , metallurgy , linguistics , philosophy
A tensile creep test technique for long‐term (10 000 h or more) measurement is described. A specimen is gripped by ceramic grips with a simple design in the hot zone of a furnace. By optimizing the grip geometry, the ratio of the parasitic bending strain to the average tensile strain can be suppressed to less than 1%. The careful hand polishing to remove machining flaws has been found essential for reliable creep tests. The long‐term test is demonstrated for silicon carbide at 1400°C under a stress of 200 MPa, by routinely replacing the heat elements, thermocouples, etc., during the test. The stability of the creep curve, which has been obtained by an optical extensometry system, is normally within ± 2 μm.