Issue 37

G. Beretta et alii, Frattura ed Integrità Strutturale, 37 (2016) 228-233; DOI: 10.3221/IGF-ESIS.37.30 233 values. The crack initiation point was close to the point of maximum stress, that is, 0º for axial tests and 45º for torsional tests. The crack direction along the Stage I was close to the maximum principal stress direction. A CKNOWLEDGEMENTS he authors would like to thank the Spanish Ministry of Education for its financial support through grant DPI2014-56904-P. R EFERENCES [1] Gough, H.J, Pollard, H.V., Clenshaw, W.J., Ministry of Supply, Aeronautical Research Council Reports and Memoranda. London: His Majesty’s Stationary Office (1951). [2] Frost, N.E., Proc Instn Mech Eng, 173 (1959) 811-827. [3] El Haddad, M.H., Topper, T.H., Smith, K.N., Prediction of Non-Propagating Cracks Eng Fract Mech, 11 (1979) 573- 584. [4] Duquesnay, D.L., Yu, M.T., Topper, T.H., in: The behaviour of short fatigue cracks, Miller, K.J, de los Rios, E.R. (Ed), Elsevier, (1986) 323-335. [5] Lukás, P., Kunz, L., Weiss, B., Stickler, R., Fatigue Fract Engng Mater Struct, 9 (1986) 195-204. [6] Tanaka, K., Akinawa, Y., in: Fatigue’87. Ritchie, R.O., Starke Jr., E.A. (Ed), Engineering Materials Advisory Services, (1987) 739-748. [7] Meneghetti, G., Susmel, L., Tovo, R., High-cycle fatigue crack paths in specimens having different stress concentration features, Eng Failure Anal, 14 (2007) 656-672. [8] Susmel, L., Taylor, D., wo methods for predicting the multiaxial fatigue limits of sharp notches, Fatigue Fract Engng Mater Struct, 26 (2003) 821-833. [9] Endo, M. (2003), in: Biaxial/Multiaxial Fatigue and Fracture, ESIS publication 31, Carpinteri, A., de Freitas, M. and Spagnoli, A. (Ed), Elsevier, (2003) 243-364. [10] Murakami, Y., Endo, M., E ff ects of defects, inclusions and inhomogeneities on fatigue strength, Int J Fatigue, 16 (1994) 163-82. [11] Brighenti, R, Carpinteri, A., A notch multiaxial-fatigue approach based on damage mechanics, Fatigue Fract Engng Mater Struct, 39 (2012) 122-133. [12] Navarro, A., de los Rios, E.R., Philos Mag A, 57 (1988) 12-36. [13] Chaves, V., Navarro, A., Beretta, G., Madrigal, C., Microstructural model for predicting high cycle fatigue strength in the presence of holes under proportional biaxial loading, Theor Appl Fract Mech, 73 (2014) 27-38. [14] Chaves, V., Navarro, A., Madrigal, C., Stage I crack directions under in-phase axial–torsion fatigue loading for AISI 304L stainless steel, Int J Fatigue, 80 (2015) 10-21. [15] Bettinelli, S., Tesi di Laurea, Universita degli studi di Padova. Supervisor: Prof. R. Tovo, (2006). [16] Chaves, V., Navarro, A., Fatigue limits for notches of arbitrary profile, Int J Fatigue, 48 (2013) 68-79. T

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