Study on the Resonant Torsion Vibration in Hourglass Specimens under VHCF Loading

Abstract The problem of cyclic loading under pure torsion is an important for numerous different industrial applications, such as shafts, springs, blades, and others. conditions aircraft, railway, automobile industries are often corresponding to long fatigue life. rough estimation shows that the number cycles springs in car engine exceeds 10 8 cycle while blades aircraft turbine may undergo more than cycles. Such, provide a safety service life elements multiaxial failure criterion needed predict damage zone location This paper aimed introduce multi regime approach evaluation crack initiation total presented based on theory supplemented by criterion. proposed model includes algorithm automatic determination range (low-, high- or very-high fatigue) allows opening modes. To show how apply verify results calculation series numerical simulation hourglass specimen subjected VHCF performed. compared tests.