Multiaxial fatigue of V-notched steel specimens: a non-conventional application of the local energy method
F. BERTO,
P. LAZZARIN,
J. R. YATES,
F. BERTO
Department of Management and Engineering, University of Padova, Stradella S. Nicola, 3-36100, Vicenza, Italy
Search for more papers by this authorP. LAZZARIN
Department of Management and Engineering, University of Padova, Stradella S. Nicola, 3-36100, Vicenza, Italy
Search for more papers by this authorJ. R. YATES
Department of Mechanical Engineering, University of Sheffield, Mappin Street, Sheffield S1 3JD, UK
Search for more papers by this authorF. BERTO,
P. LAZZARIN,
J. R. YATES,
F. BERTO
Department of Management and Engineering, University of Padova, Stradella S. Nicola, 3-36100, Vicenza, Italy
Search for more papers by this authorP. LAZZARIN
Department of Management and Engineering, University of Padova, Stradella S. Nicola, 3-36100, Vicenza, Italy
Search for more papers by this authorJ. R. YATES
Department of Mechanical Engineering, University of Sheffield, Mappin Street, Sheffield S1 3JD, UK
Search for more papers by this authorP. Lazzarin. E-mail: [email protected]
ABSTRACT
The paper deals with the multi-axial fatigue strength of notched specimens made of 39NiCrMo3 hardened and tempered steel. Circumferentially V-notched specimens were subjected to combined tension and torsion loading, both in-phase and out-of-phase, under two nominal load ratios, R=−1 and R= 0, also taking into account the influence of the biaxiality ratio, λ=τa/σa. The notch geometry of all axi-symmetric specimens was a notch tip radius of 0.1 mm, a notch depth of 4 mm, an included V-notch angle of 90° and a net section diameter of 12 mm. The results from multi-axial tests are discussed together with those obtained under pure tension and pure torsion loading on plain and notched specimens. Furthermore the fracture surfaces are examined and the size of non-propagating cracks measured from some run-out specimens at 5 million cycles. Finally, all results are presented in terms of the local strain energy density averaged in a given control volume close to the V-notch tip. The control volume is found to be dependent on the loading mode.
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