Journal
INTERNATIONAL JOURNAL OF DAMAGE MECHANICS
Volume 23, Issue 6, Pages 839-854Publisher
SAGE PUBLICATIONS LTD
DOI: 10.1177/1056789513514071
Keywords
Notch fracture toughness; mode II; U-notch; polycrystalline graphite; U-notched Brazilian disc; shear fracture
Categories
Funding
- Iran National Science Foundation (INSF) [90006227]
Ask authors/readers for more resources
A disc-type specimen containing a central bean-shaped slit, called the U-notched Brazilian disc specimen, was utilized to measure experimentally the mode II notch fracture toughness of a type of commercial polycrystalline graphite. First, 24 U-notched Brazilian disc graphite specimens were fabricated for four different notch tip radii, and the monotonic fracture tests were performed under pure mode I and pure mode II loading conditions; 12 for each loading mode. The recorded fracture loads were converted to the corresponding notch fracture toughness values, and the ratio mode II notch fracture toughness/mode I notch fracture toughness was experimentally determined. Then, assuming that the experimental values of mode I notch fracture toughness are known, the mode II notch fracture toughnesses were theoretically predicted by means of two brittle fracture criteria, namely the existing U-notched maximum tangential stress and the newly developed U-notched mean stress. A very good agreement was found to exist between the theoretical and the experimental results. Also, found in this research was that both the criteria could predict well the experimentally measured fracture initiation angles.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available