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Dynamic Fracture Characterization of Al 2 O 3 and SiC w /Al 2 O 3
Author(s) -
Deobald Lyle R.,
Kobayashi Albert S.
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.tb05519.x
Subject(s) - materials science , fracture (geology) , transgranular fracture , characterization (materials science) , fracture mechanics , composite material , stress intensity factor , ceramic , bar (unit) , join (topology) , whiskers , microstructure , grain boundary , geology , nanotechnology , mathematics , oceanography , intergranular fracture , combinatorics
The dynamic stress intensity factors, which were determined with newly developed bar impact facilities and a new data reduction procedure, for an Al 2 O 3 ceramic and 29 vol% SiC w /Al 2 O 3 composite were virtually identical, thus indicating that the short SiC whiskers were ineffective under dynamic fracture. SEM studies revealed five distinct fracture morphologies with increased percentage area of transgranular fracture in both materials with rapid crack propagation. Also, the high dynamic stress intensity factor caused multiple microscopic crack planes to form and then join as the crack advanced.