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ENGINEERING ESTIMATION OF THE LOWER BOUND TOUGHNESS IN THE TRANSITION REGIME OF FERRITIC STEELS
Author(s) -
Zerbst,
Heerens,
Pfuff,
Wittkowsky,
Schwalbe
Publication year - 1998
Publication title -
fatigue and fracture of engineering materials and structures
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.887
H-Index - 84
eISSN - 1460-2695
pISSN - 8756-758X
DOI - 10.1046/j.1460-2695.1998.00048.x
Subject(s) - weibull distribution , fracture toughness , upper and lower bounds , materials science , brittleness , toughness , line (geometry) , composite material , structural engineering , forensic engineering , mathematics , geometry , engineering , mathematical analysis , statistics
A simple engineering method for estimating a lower bound fracture toughness in the ductile‐to‐brittle transition region is presented. It is based on empirical evidence that the lower tail of the failure probability versus fracture toughness curve tends to be a straight line rather than a Weibull curve. Fitting the lower tail by a straight line, however, gives an engineering lower bound at a theoretical failure probability of zero. The method enables one to obtain lower bounds using small data sets of three or four specimens.