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Effect of Loading Rate on Fracture Toughness of SiC at High Temperatures
Author(s) -
Popp G.,
Pabst R. F.
Publication year - 1981
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.1151-2916.1981.tb09545.x
Subject(s) - materials science , composite material , fracture toughness , fracture (geology) , phase (matter) , metal , analytical chemistry (journal) , metallurgy , chemistry , organic chemistry , chromatography
Loading rate sensitivity effects at high temperatures are brought about by a viscous metallic Si phase within an SiC mircostructure. The cross‐head speeds were 0.024 and 1260 mm/min. At 0.024 mm/min and 1200°C, K IC increases up to ∼12 MN/m 3/2 , whereas at 1260 mm/min, K IC remains nearly unaffected, comparable with the room temperature value of ∼4 MN/m 3/2 . The effect contradicts the normal behavior where K IC increases with increasing cross‐head speed. Fracture toughness data should therefore be determined as a Junction of loading rate, to account for viscous reactions at certain temperatures.