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Creep Behavior of Si 3 N 4 ‐Whisker‐Reinforced Si 3 N 4 ‐Matrix Composites Using an In Situ Dynamic Beam Profiling Method
Author(s) -
Costa Célio A.,
Todd Judith A.
Publication year - 1999
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.1151-2916.1999.tb01808.x
Subject(s) - whisker , materials science , composite material , creep , ultimate tensile strength , beam (structure) , ceramic matrix composite , ceramic , in situ , structural engineering , chemistry , engineering , organic chemistry
A four‐point flexure test, capable of simultaneously measuring load‐point and beam‐center displacements and permitting in situ profiling of the beam throughout the test, has been developed. Compressive and tensile strains in the outer fibers, together with the neutral axis displacement, were determined in real time for Si 3 N 4 ‐whisker‐reinforced Si 3 N 4 ‐ceramic‐matrix composites. Combining these data with the closed form solution of Chen and Chuang gave excellent correspondence between the creep exponents determined from flexure tests with those determined independently from tensile and compressive creep tests.