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eng.notch-stress-concentration Calculator
Calculates the stress concentration factor (Kt) for notches, holes, and fillets from geometrical parameters, and the fatigue notch factor (Kf). Kf = 1 + q(Kt − 1) where q is the notch sensitivity — high-strength steels are more notch sensitive and have higher Kf.
Inputs
Nominal Stress Mpa
Internal force per unit area (Pa or MPa). Must stay below yield strength in service.
Kt
Amount of solute per unit volume. Higher concentration = more solute dissolved.
A Mm
Distance from centre to edge of a circle. Radius = diameter / 2.
Material Sy Mpa
Stress at which permanent deformation begins. Design loads should stay below this — apply a safety factor of 1.5–3×.
Results
peak stress σ_max (MPa)
Internal force per unit area (Pa or MPa). Must stay below yield strength in service. Beyond yield: permanent deformation. Beyond tensile strength: fracture.
fatigue stress concentration Kf
Internal force per unit area (Pa or MPa). Must stay below yield strength in service. Beyond yield: permanent deformation. Beyond tensile strength: fracture.
equivalent fatigue stress (MPa)
Internal force per unit area (Pa or MPa). Must stay below yield strength in service. Beyond yield: permanent deformation. Beyond tensile strength: fracture.
σ_max = Kt × S_nom
Sample size or count used in the calculation.
Kf = 1 + q(Kt-1)
Reference formula or conversion factor shown for context.
yielded?
Reference formula or conversion factor shown for context.