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Dynamic Fracture Toughness of Porous Ceramics
Author(s) -
Samborski Sylwester,
Sadowski Tomasz
Publication year - 2010
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.1551-2916.2010.04133.x
Subject(s) - porosity , materials science , fracture toughness , composite material , ceramic , fracture (geology) , toughness
The paper presents experimental results of static ( K I c ) and dynamic ( K I d ) fracture toughness testing. The tests were performed for two kinds of porous ceramics with various porosity fraction. The influence of porosity content, as well as loading rate on fracture toughness of alumina (Al 2 O 3 ) and magnesia (MgO) as analyzed. It was found that an increase of initial porosity reduces values of both static and dynamic fracture characteristics. However, values of K I d were much higher than K I c for both kinds of tested materials. In case of Al 2 O 3 , they were approximately three times higher, whereas in case of MgO—five to seven times higher depending on the porosity content.