Fatigue & S-N Design

Endurance limit, Basquin S-N line and Goodman / Gerber safety factors for common engineering materials.

Input Parameters

Material

Ultimate strength S_ut

MPa

Yield strength S_y

MPa

Endurance limit S_e′

MPa

Surface factor k_a

—

Size factor k_b

—

Load factor k_c

Reliability factor k_d

—

Temperature factor k_e

—

Misc. factor k_f

—

Analysis mode

Alternating stress σ_a

MPa

Mean stress σ_m

MPa

Mean-stress criterion

Target life N

cycles

Target safety factor

—