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Keccecioglu, Chester and Dodge Method Fatigue Curve Equation

Strength and Mechanics of Materials

Keccecioglu, Chester and Dodge Method Method 

= Amplitude of normal (shear) stress [MPa,psi]
= Endurance limit at constant strength [MPa,psi]
= Mean cycle stress [MPa,psi]]
= Ultimate tensile strength [MPa,psi]
= Ultimate Shear strength When SUS  .8SU [MPa,psi]
= Exponent depending on joint strength
a = Recommended a <2.6 ...... 2.75>

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