Hello All,
Since so many have ask for specifics of the design, I thought it would be best to spend some time explaining it.
The sping is a leaf spring that can be modeled as a cantilever beam rigidly supported on both ends. The beam however is not straight, but instead made up of 3...
I've tried shot peening. The material is far too thin. Rather than compressing the surface layer it deformes the actual spring shape.
My mistake NickE. I'll know what to use when talking to a toilet paper manufacturer now. You've saved me from the ultimate embarrassment.
It's a little envolved, but the gist of it is that the spring is essentially a cantilever beam. It's formed in the straight position and then the tip is raised and held at an upper position. During the lifespan, the tip is displaced downward upto 2x the amount it was originally displaced...
Thanks Israelkk,
We're using 17-7 condition C that goes thorough a 900F age hardening process. Would that be any better that 17-7PH. Appreciate your help and input.
Elmer
Yes, we are designing a leaf spring, not a coil spring. There is no load requirement, only a deflection and fatigue requirement.
The question was not meant to elicit assistance in designing the spring itself. I simply was trying to get suggestions for materials.
The spring's max strain is...
We're currently using a stainless 17-7 Condition C material.
The material needs to go through a 4 slide die for cold forming and cutting. Thus, we need it in a 2" width by 0.015" thick roll.
It is subjected to a stainless of about 0.005, 1/2% strain and must be resistant to fatigue for at...
