How To Calculate Average Yield Strength 1

[Tippaporn]

I've searched hi and lo for a definition of "average yield strength" and have come up empty. I utilize a particular formula which determines the bottoming force of a forming operation in metal press stamping. Bottoming force is the force exerted when a forming operation is at the bottom of the press stroke, at which point the stackup of die, material, and punch is solid. Material specs include "yield strength" but do not include "average yield strength."

Is there another term for it? And how can I obtain a value for any given material? Not knowing what else to do I have been using a value betwixt ultimate tensile strenght and yield strength. Can't be right but I must input a value.

Western Design Services Co. Ltd.
Bangkok, Thailand
Western Design Services
Chicago, Illinois USA

 

[weldstan]

Tippaporn,
For your application(s), a material temper grade would be purchased. Each temper grade has minimal varience in hardness and tensile properties. You should be able to determine an average relatively easy; however, would you not like to know the maximum YS of the temper grade?