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Dynamic Fracture Responses of Alumina and Two Ceramic Composites
Author(s) -
Yang KwanHo,
Kobayashi Albert S.
Publication year - 1990
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.1151-2916.1990.tb07593.x
Subject(s) - whisker , transgranular fracture , materials science , composite material , fractography , fracture (geology) , ceramic , fracture mechanics , ceramic matrix composite , stress intensity factor , microstructure , intergranular fracture , grain boundary
A hybrid experimental‐numerical procedure was used to characterize the dynamic fracture response of alumina (Al 2 O 3 ) and TiB 2 ‐particulate/SiC‐matrix and SiC‐whisker/Al 2 O 3 ‐matrix composites. Unlike metals and polymers, dynamic arrest stress intensity factors (SIFs) did not exist in the monolithic ceramics and the two ceramic composites considered. Thus a running crack in these materials cannot be arrested by lowering the driving force, i.e., the dynamic SIF. Fractography study of the alumina specimens showed that the area of transgranular failure varied from about 3% to about 16% for rapid crack extensions in statically and impact loaded specimens, respectively. The influence of kinematic constraints which enforces transgranular flat crack extension, despite the higher fracture energy of transgranular fracture, is discussed.