Issue 33

V. Shlyannikov et alii, Frattura ed Integrità Strutturale, 33 (2015) 335-344; DOI: 10.3221/IGF-ESIS.33.37 344 - increasing of the crack growth rates is observed in the direction of the deepest point of the crack front with respect to the crack front intersection with the free surface of the hollow cylindrical specimens; - the experimental and numerical results of the present study background provide an opportunity to explore the suggestion that crack growth rate may be represented by the plastic stress intensity factor, rather than the magnitude of the elastic SIFs alone; - it is stated that the elastic-plastic stress intensity factor, which is sensitive to the constraint effects and elastic-plastic material properties, is attractive as the self-dependent unified parameter for characterization of the material fracture resistance properties. A CKNOWLEDGMENT he authors gratefully acknowledge the financial support of the Russian Scientific Foundation under the Project 14- 19-01716. R EFERENCES [1] Newman, J.C., Raju, I.S., An empirical stress-intensity factor equation for the surface crack, Eng. Fract. Mech., 15 (1- 2) (1981) 185-192. [2] Carpinteri, A., Brighenti, R., Part-through cracks in round bars under cyclic combined axial and bending loading, Int. J. Fatigue, 18 (1) (1996) 33-39. [3] Yang, F.P., Kuang, Z.B., Shlyannikov, V.N., Fatigue crack growth for straight-fronted edge crack in a round bar, Int. J. Fatigue, 28 (2006) 431–437. [4] Citarella, R., Lepore, M., Slyannikov, V., Yarullin, R., Fatigue surface crack growth in cylindrical specimen under combined loading, Eng. Fract. Mech., 131 (2014) 439-453. [5] Shlyannikov, V.N., Tumanov, A.V., Characterization of crack tip stress fields in test specimens using mode mixity parameters, Int. J. Fract., 185 (2014) 49-76. [6] Shlyannikov, V.N., Zakharov, A.P., Multiaxial crack growth rate under variable T-stress, Eng. Fract. Mech., 123 (2014) 86–99. [7] Shlyannikov, V.N., Tumanov, A.V., Zakharov, A.P., The mixed mode crack growth rate in cruciform specimens subject to biaxial loading, Theoret. Appl. Fract. Mech., 73 (2014) 68-81. [8] ANSYS Mechanical APDL Theory Reference Release 14.5// ANSYS, Inc. Southpointe, 275 Technology Drive, CanonBurg, PA 2012. [9] Guo, W.L., Elasto-plastic three dimensional crack border field-I, Eng. Fract. Mech., 46 (1993) 93-104. [10] Henry, B.S., Luxmoore, A.R., The stress triaxiality constraint and the Q-value as ductile fracture parameter, Eng. Fract. Mech., 55 (1997) 375-390. [11] Hutchinson, J.W., Singular behaviour at the end of a tensile crack in a hardening material, Journ. Mech. Phys. Solids, 16 (1968) 13-31. T