Mode III Notch Fracture Toughness Assessment for Various Notch Features

In the present paper, two stress-based failure criteria are proposed to predict the notch fracture toughness for three different notch features under pure mode III loading. These criteria are developed based on the two well-known failure concepts of the point-stress and the mean-stress previously us...

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Bibliographic Details
Published in:Physical mesomechanics 2018-07, Vol.21 (4), p.320-332
Main Authors: Torabi, A. R., Saboori, B., Ayatollahi, M. R.
Format: Article
Language:English
Subjects:
Brittle fracture
Classical Mechanics
Criteria
Fracture toughness
Materials Science
Notches
Physics
Physics and Astronomy
Predictions
Round bars
Solid State Physics
Stresses
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Summary:In the present paper, two stress-based failure criteria are proposed to predict the notch fracture toughness for three different notch features under pure mode III loading. These criteria are developed based on the two well-known failure concepts of the point-stress and the mean-stress previously used for predicting brittle fracture in notched members under various loading conditions. The validity of the criteria is verified through the comparison of their theoretical predictions with a bulk of test data reported in the open literature on mode III fracture of graphite notched round bars. Very good agreement is shown to exist between the experimental and theoretical results. Moreover, the comparison revealed that the mean-stress criterion is more accurate than the point-stress criterion in predicting mode III brittle fracture of V-notches and semicircular notches.
ISSN:1029-9599
1990-5424
DOI:10.1134/S1029959918040069