Abstract
The four-point bend specimen subjected to anti-symmetric loading (ASFPB) is frequently used for determining pure mode II fracture resistance of rock materials. It is shown in this paper that, when the applied loads are close to the crack plane, the ASFPB specimen does not provide pure mode II condition, since the effect of mode I also appears in crack tip deformation. A set of fracture test were also conducted on a type of marble using ASFPB configuration. The test results showed that fracture resistance is strongly dependent on the loading distance from the crack plane. The effective fracture toughness increases when the distance between the loading points and the crack plane decreases. It is shown that the enhanced fracture resistance of marble samples could be mainly because of very large negative T-stresses that exist for the mentioned loading situations.
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Ayatollahi M.R., Aliha M.R.M. (2005) Cracked Brazilian disc specimen subjected to mode II deformation. Engineering Fracture Mechanics 72: 493–503
Ayatollahi M.R., Aliha M.R.M. (2007) Fracture toughness study for a brittle rock subjected to mixed mode I/II loading. International Journal of Rock Mechanics and Mining Science 44(4): 617–624
Erdogan F., Sih G.C. (1963) On the crack extension in plates under plane loading and transverse shear. Journal of Basic Engineering, Transactions of ASME 85: 519–525
Galvezi J.C., Cendon D.A., Planas J. (2002) Influence of shear parameters on mixed–mode fracture of concrete. International Journal of Fracture 118: 163–189
Geers M.G.D., Borst R.D., Peerlings R.H.J. (2000) Damage and crack modeling in single-edge and double-edge notched concrete beams. Engineering Fracture Mechanics 65: 247–261
Hussain, M.A. Pu, S.L. and Underwood, J. (1974). Strain energy release rate for a crack under combined mode I and Mode II. Fracture Analysis, ASTM STP 560, Philadelphia, 2-28.
Li H., Yang H., Liu Z. (2000) Experimental investigation of fracture toughness KIIc of frozen soil. Canadian Geotechnical Journal 3: 253–258
Sih G.C. (1974) Strain-energy-density factor applied to mixed mode crack problems. International Journal of Fracture 10: 305–321
Smith D.J., Ayatollahi M.R., Pavier M.J. (2001) The role of T-stress in brittle fracture for linear elastic materials under mixed mode loading. Fatigue and Fracture of Engineering Materials and Structures 24: 137–150
Swartz, S.E., Lu, L.W., Tang, L.D. and Refai, T.M.E. (1988). Mode II fracture parameter estimates for concrete from beam specimens. Experimental Mechanics 146-153.
Wang J.J., Zhu J.G., Chiu C.F., Chai H.J. (2007) Experimental study on fracture behaviour of silty clay. Geotechnical Testing Journal 30(4): 303–311
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Aliha, M.R.M., Ayatollahi, M.R. & Kharazi, B. Mode II Brittle Fracture Assessment Using ASFPB Specimen. Int J Fract 159, 241–246 (2009). https://doi.org/10.1007/s10704-009-9402-z
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DOI: https://doi.org/10.1007/s10704-009-9402-z