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Transverse Strength of SCS‐6 Silicon Carbide Fibers
Author(s) -
Eldridge Jeffrey I.,
Wiening Jonathan P.,
Davison Terry S.,
Pindera MarekJerzy
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.tb06622.x
Subject(s) - materials science , composite material , ultimate tensile strength , compressive strength , transverse plane , fiber , core (optical fiber) , silicon carbide , stress (linguistics) , cylinder stress , compression (physics) , structural engineering , linguistics , philosophy , engineering
A diametral compression test was used to measure the transverse strength of SCS‐6 SiC fibers before and after heat treatment. Subjecting fibers to diametral compression successfully produced transverse tensile failure in the form of fiber cracking along the same diametral plane in which the compressive load was applied. An analysis of the hoop stress along the diametral plane, in which the effects of the C core were included, showed that there is a large tensile hoop stress concentration in the SiC sheath at the interface between the C core and the SiC sheath, where the stress is 6.3 times greater than the stress present in a solid SiC fiber under identical loading. This high tensile hoop stress concentration promotes crack initiation near the core and significantly limits the capability of these fibers to withstand transverse compressive loading. The maximum tensile hoop stresses, located at the interface between the C core and SiC sheath, at the measured failure loads were 850 MPa for the as‐received SCS‐6 fiber and 1210 MPa for fibers exposed to a 1‐h heat treatment at 1850°C in 138 MPa of Ar.