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Need Formula for Determining Max Bend of Spring Steel

Need Formula for Determining Max Bend of Spring Steel

Need Formula for Determining Max Bend of Spring Steel

(OP)
Thank you for your time.  I need to know the basics of C1075-C1095 spring steel when used as a cantilever spring.  Approximate dimensions are 18" long x 14" wide and .062-.125 thick.

Specific questions:
What is the maximum bend before the spring will take a permanent set?  I've been using 10 inch radius since high carbon metal strips ship in rolls with a 10 inch inside radius without setting.  More specifically, what is the formula?  I assume thickness matters and need to determine if it is better to go with a thinner but wider strip of spring steel when possible.  

Also, will the .062 have a longer life than the .125 for the same bend?  Is there a way to calculate the approx. life span?

Variables include width, thickness, amount of Carbon, and total bend per unit of length (again, been using a 10 inch radius).

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