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sci.fatigue-stress-life-Basquin Calculator
Calculates fatigue life using the Basquin power law: N_f = (σ_a/σ_f')^(1/b) and alternating stress from stress amplitude and mean stress (Goodman correction). Basquin exponent b ≈ −0.1 for aluminium, −0.08 for steel — Goodman correction: σ_a/σ_e + σ_m/UTS = 1.
Inputs
Sigma F Mpa
Reference formula or conversion factor shown for context.
B Exp
Reference formula or conversion factor shown for context.
N Cycles
Count of items or occurrences.
Sigma A Mpa
Maximum displacement from equilibrium. Energy carried by a wave is proportional to amplitude squared.
Results
cycles to failure N_f
Sample size or count used in the calculation.
stress amplitude at N cycles (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 safety factor
A dimensionless multiplier applied in the calculation.
σa = σ\
Reference formula or conversion factor shown for context.
life assessment
Sample size or count used in the calculation.
surface finish note
Supplementary information explaining an assumption, caveat, or important context for interpreting the result.