U-shaped circumferential groove on a shaft. Theoretical stress concentration factors (Kt) calculator for tension, bending and torsion loads.
Note:Use dot "." as decimal separator.
Note 1: Maximum stress is occurred at point A.
Note 2: * Geometry rises σnom by a factor of Kt . (Kt = σnom/σmax)
Note 3: ** Geometry rises τnom by a factor of Kt . (Kt = τnom/τmax)
Note 4: o σnom = 4P/(πd2) (Nominal tension stress occurred due to tension load)
Note 5: + σnom = 32M/(πd3) (Nominal tension stress occurred due to bending)
Note 6: x τnom = 16T/(πd3) (Nominal shear stress occurred due to torsion)
Stress Concentration Factor: Dimensional changes and discontinuities of a member in a loaded structure causes variations of stress and high stresses concentrate near these dimensional changes. This situation of high stresses near dimensional changes and discontinuities of a member (holes, sharp corners, cracks etc.) is called stress concentration. The ratio of peak stress near stress riser to average stress over the member is called stress concentration factor.
concentration factor in elastic range = (σmax/σnom)