Issue 38

M. Leitner et alii, Frattura ed Integrità Strutturale, 38 (2016) 47-53; DOI: 10.3221/IGF-ESIS.38.06 53 exhibiting a ratio  R /  R of 1.96. Proportional multiaxial fatigue tests illustrate that the elliptical model by Gough and Pollard [5] matches well to the results. An application of the Huber-Mises-Hencky equivalent stress criterion shows, in comparison to the maximum normal stress concept, good accordance to the experiments. The effect of non-proportional loading on the fatigue strength of 34CrNiMo6 specimens is presented based on experimental investigations in [1]. Further extensive analyses incorporating the Huber-Mises-Hencky and additional multiaxial criteria, e.g. integral-based approaches [9], are scheduled. REFERENCES [1] Fröschl, J., Fatigue behaviour of forged components: Technological effects and multiaxial fatigue, PhD Thesis, Montanuniversität Leoben, Austria, (2006). [2] Buch, A., Notch-Size Effect in Fatigue of Steel Specimens - Verification of Some Calculation Methods, Z. Werkstofftech., 15 (1984) 338-348. [3] Eichlseder, W., Fatigue analysis by local stress concept based on finite element results Comp. & Struct., 80 (2002) 2109–2113. [4] Kurek, M., Lagoda, T., Comparison of the fatigue characteristics for some selected structural materials under bending and torsion, Mat. Sc., 47 (2011) 334-344. [5] Gough, H. J., Pollard, H. V., Clenshaw, W. J., Some experiments on the resistance of metals under combined stress, Aeronautical Research Council, 2522, His Majesty’s Stationary Office, London, (1951). [6] Liu, J., Zenner, H., Berechnung der Dauerschwingfestigkeit bei mehrachsiger Beanspruchung - Teil 1, Mat.-wiss. u. Werkstofftech., 24 (1993) 240-249. [7] Stanfield, G., Discussion of the strength of metals under combined alternating stresses, Proc. of the Inst. of Mech. Eng., 131 (1935) 93. [8] Karolczuk, A., Macha, E., A review of critical plane orientations in multiaxial fatigue failure criteria of metallic materials, Int. J. of Fract., 134 (2005) 267-304. [9] Zenner, H., Simbürger, A., Liu, J., On the fatigue limit of ductile metals under complex multiaxial loading, Int. J. of Fatigue, 22 (2000) 137-145.