Abstract
Abstract: The work deals with multiaxial fatigue strength of notched specimens made of 40CrMoV13.9. Circumferentially V-notched specimens and semicircular notched were tested under combined tension and torsion loading, both in-phase and out-of-phase. The geometry of axis-symmetric V-notched specimens was characterized by a constant notch tip radius (1 mm) and V-notch opening angle of 90°. The semicircular specimens were characterized by a constant notch tip radius. In both cases the diameter of the net sectional area was 12 mm. The results from multi-axial tests are discussed together with those obtained under pure tension and pure torsion loading from notched specimens with the same geometry. Altogether more than 120 new fatigue data are summarised in the present work. All fatigue data are presented first in terms of nominal stress amplitudes and then re-analysed in terms of the mean value of the strain energy density evaluated over a finite size semicircular sector surrounding the tip of the notch.
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