Determination of Fracture Toughness at High Temperatures after Subcritical Crack Extension
作者:
Theo Fett,
Dietrich Munz,
期刊:
Journal of the American Ceramic Society
(WILEY Available online 1992)
卷期:
Volume 75,
issue 11
页码: 3133-3136
ISSN:0002-7820
年代: 1992
DOI:10.1111/j.1151-2916.1992.tb04399.x
出版商: Blackwell Publishing Ltd
数据来源: WILEY
摘要:
As a consequence ofR‐curve behavior, ceramic materials may exhibit increased fracture toughness (KIc) following slow crack extention. In this investigation, the effect of crack propagation on fracture toughness is studied in static bending tests. For the calculation of stress intensity factors (KI) the stress distribution must be known at the moment of fracture. As a consequence of creep, this stress distribution must deviate from the linear distribution. The corresponding stress intensity factors are computed using the fracture mechanical weight function. Experimental results for fracture toughness are communicated for a 2.5%‐MgO‐doped hot‐pressed Si3N4a
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