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Calculate Basquin life, two-point S-N curve coefficients, Goodman/Gerber/Soderberg corrections, and Miner damage for preliminary fatigue review.
Mean-stress corrected amplitude
62.5 MPa
Unit-normalization summary: 5.00000e+7 Pa; 1.00000e+8 Pa; 6.25000e+7 Pa
N=(sigma_a/A)^(1/b); D=sum(n_i/N_i)
sigma_a = A N^b; N = (sigma_a/A)^(1/b); Goodman, Gerber, and Soderberg adjust alternating stress for mean stress.
sigma_a,eq = 6.25000e+7 Pa
N = (6.25000e+7 Pa / 9.00000e+8 Pa)^(1 / -0.09)
Fatigue estimates are sensitive to local stress, detail category, material data, and scatter. Treat results as screening values only.
Fatigue is progressive damage caused by repeated or fluctuating stress, often below static strength. Stress range, mean stress, S-N data, cycle count, surface condition, size, environment, and notch effects influence life, while cumulative damage methods approximate mixed loading histories.
Fatigue Life Estimator applies this concept to its defined inputs and workflow. This fatigue workflow can consume stress amplitudes from shaft, weld, or FEA stress calculators, but it does not create material fatigue data. Its governing relationship or workflow is stated as follows: Basquin stress-life estimate, mean-stress correction, and Miner cumulative damage.
The calculator evaluates Calculation mode, Material preset, and Display precision and returns Fatigue Life, base-unit normalization, formula substitution, and calculation steps using the stated method. The selected units and sign or reference conventions must describe one consistent physical case. Users should interpret the output within the assumptions shown on the page and repeat the check with trusted reference values when the result affects engineering or research decisions. No rainflow counting, crack growth, notch correction, weld class, or probabilistic reliability model.
| Symbol | Meaning | Unit |
|---|---|---|
| sigma_a | Alternating stress amplitude | Pa |
| sigma_m | Mean stress | Pa |
| N | Cycles to failure estimate | cycles |
| A, b | Basquin coefficient and exponent | Pa, - |
| D | Miner cumulative damage | - |
The fatigue workflow can consume stress amplitudes from shaft, weld, or FEA stress calculators, but it does not create material fatigue data.
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