Correction factor for helical compression spring

[EngineerRed]

I'm designing a helical coil compression spring . The spring has to be preset to the final free length . Which correction factor should I use for after set removed condition ? Is it Wahl's that considers both curvature and direct shear or just the direct shear

What is the correct method to design a spring that has to be preset ? Should I use Wahls factor(Kw1) initially , keep the shear stress above maximum to allow deformation for presetting and then determine the final shear stress after set removal by Kw2 ?

 

[goutam_freelance]

Shigley recommends use of K_B.

So unless you have more authentic factor found in practice you should use K_B.

Engineers, think what we have done to the environment !

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