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Temperature dependence of the microscopic cleavage fracture stress
Author(s) -
JüdeEsser Christoph,
Grimpe Fabian,
Dahl Winfried
Publication year - 1995
Publication title -
steel research
Language(s) - English
Resource type - Journals
eISSN - 1869-344X
pISSN - 0177-4832
DOI - 10.1002/srin.199501122
Subject(s) - cleavage (geology) , fracture (geology) , materials science , composite material , crosshead , ultimate tensile strength , dislocation , enhanced data rates for gsm evolution , forensic engineering , flexural strength , computer science , telecommunications , engineering
The microscopic cleavage fracture stress which could be responsible for dramatic failure is commonly seen as a temperature independent material property. But a dependence on temperature was found in several former investigations. In this work new studies on cleavage fracture with low carbon steel C 10 were performed. The stress was determined with double‐edge notched tensile (DENT) specimens at different temperatures and various crosshead speeds. In addition tests were made with four‐point bend specimens (SENB4) according to Griffiths and Owen. A significant influence of temperature on the microscopic cleavage fracture stress was found. The explanation for this result is seen in terms of the thermal activation of dislocation movement, which is needed to produce the critical conditions for fracture. As temperature independence is proposed from the “Local Approach” a check up of this procedure is given and limitations of the “Weakest Link‐model” are shown.