Soderberg Line Method Fatigue Curve Equation
Strength and Mechanics of Materials
Soderberg Equation Method for Fatigue
( σa / σe ) + ( σm / Sy ) = 1
( τa / τe ) + ( τm / SYS ) = 1
Where:
σa, τa = Amplitude of normal (shear) stress [MPa, psi]
σe, τe = Endurance limit at constant strength [MPa, psi]
σm = Mean cycle stress [MPa, psi]
τm = Yield tensile strength [MPa, psi]
Sy = Yield tensile strength [MPa, psi]
SYS = Yield shear strength [MPa,psi] when SYS ≈ .577 Sy
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- Local Stress-Strain Fatigue Method
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Source:
Budynas, Richard G., and J. Keith Nisbett, Shigley's Mechanical Engineering Design, 8th ed., New York: McGraw-Hill, 2008.
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