Optimization of the three-point bend test for fracture energy measurement
Of the various methods for measuring the fracture energy of a material, the three-point slow bend test has the merit of being simple and straightforward to execute. It can only be expected to give valid results, however, when the crack propagates quasi-statically. A simple criterion is proposed to determine whether a specimen of given geometry and meterial will fracture in a stable or unstable manner when tested in a particular machine. The prediction of the criterion is compared with experimental results obtained on a variety of rocks, and is found to give good agreement.
KeywordsPolymer Fracture Energy Valid Result Energy Measurement Bend Test
Unable to display preview. Download preview PDF.
- 1.R. L. Bertoletti,J. Amer. Ceram. Soc. 57 (1974) 300.Google Scholar
- 2.G. P. Marhsall, J. G. Williams andC. E. Turner,J. Mater. Sci. 8 (1973) 919.Google Scholar
- 3.H. G. Tattersall andG. Tappin,ibid 1 (1966) 296.Google Scholar
- 4.R. W. Davidge andG. Tappin,ibid 3 (1968) 165.Google Scholar
- 5.J. Nakayama,J. Amer. Ceram. Soc. 48 (1965) 583.Google Scholar
- 6.W. F. Brown andJ. E. Srawley, ASTM special technical publication No. 410, ASTM Philadelphia (1966) p. 9.Google Scholar
- 7.G. C. Sih, "Handbook of stress intensity factors", (Institute of Fracture and Solid Mechanics, Lehigh University, Bethlehem. Pa., 1973).Google Scholar
- 8.R. G. Hoagland, G. T. Hahn, A. T. Rosenfield, R. Simons andG. D. Nicholson, Battelle research report, Contract HO 210006 January 1972).Google Scholar
- 9.R. G. Hoagland, G. T. Hahn, andA. R. Rosenfield,Rock Mechanics 5 (1973) 77.Google Scholar
- 10.J. J. Gilman,J. Appl. Phys. 31 (1960) 2208.Google Scholar
- 11.H. Bergkvist, to be published.Google Scholar