Fatigue Life Calculator | Cycles to Failure & Stress Analysis Tool

Fatigue Life Tool Formula:

Fatigue Life (N):

\[ N = (\frac{\sigma_{a}}{\sigma_{f}})^{\frac{1}{b}} \]

(where σ_a = stress amplitude, σ_f = fatigue strength coefficient, b = fatigue strength exponent)

The Fatigue Life Calculator assists the engineers, designers and students calculate the number of cycles in which a material or component may endure before failure under repeated or varying loading. Shafts, beams, gears, and other mechanical components that experience cyclic stress at the ultimate strength below the material are usually subjected to fatigue failure.

The maximum stress, minimum stress, mean stress, alternating stress, material endurance limit or stress concentration factors can be entered by the users. The calculator can determine the fatigue life (cycles), the safety factor, and the endurance limit by using S-N (stress-life) techniques or the Goodman / Modified Goodman diagrams. The calculation of the alternating and mean stress, as well as the ratio of the stress, and the fatigue life is presented in the form of step-by-step equations, and this allows one to establish a mechanical and structural component that can endure the effects of repeated loading.

The SI units are supported: N, kN, mm, m, Pa, MPa, GPa. It is a tool that would suit mechanical engineers, civil engineers, design engineers, and students who need to be certain with accurate prediction of fatigue life and safe design of rotating shafts, beams, and other parts with cyclic loads.