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Structural Engineering and Mechanics Volume 50, Number 6, June25 2014 , pages 723-740 DOI: https://doi.org/10.12989/sem.2014.50.6.723 |
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Mixed mode fracture assessment of U-notched graphite Brazilian disk specimens by means of the local energy |
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A.R. Torabi and F. Berto
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| Abstract | ||
| A fracture criterion based on the strain energy density (SED) over a control volume, which embraces the notch edge, is employed in the present paper to assess the fracture loads of some U-notched Brazilian disk (UNBD) specimens. The specimens are made of commercial graphite and have been tested under pure mode I, pure mode II and mixed mode I/II loading. The results show that the SED criterion allows to successfully assess the fracture loads of graphite specimens for different notch tip radii and various mode mixity conditions with discrepancies that fall inside the scatter band of +-20%. | ||
| Key Words | ||
| Strain Energy Density (SED); U-notch; brittle fracture; mixed mode loading; graphite; UNotched Brazilian disk (UNBD) | ||
| Address | ||
| A.R. Torabi : Fracture Research Laboratory, Faculty of New Science and Technologies, University of Tehran, P.O. Box 13741-4395, Tehran, Iran F. Berto : Department of Management and Engineering, University of Padova, Stradella, S. Nicola 3-36100 Vicenza, Italy | ||