Choose a design based on stress

[2slowtogofast]

Homework Statement

Your given two designs for the same component. Design 1 has a stress pf 120 Mpa design 2 has a stress of 90Mpa. They are both made from the same material and the ultimate strength is 290Mpa and the yeild strength is 250 for both. The question is if yeild strength is the loss of function parameter which design would you pick,


I would think to choose one b/c it can handle more stress but i don't know what that has to do with yeild strength could someone point me in the right direction.

 

[john.phillip]

If your only criteria is yield stress, not deflection, neither fatigue life, nor weight or cost and not manufacturing. Then you are solely talking about Factor of Safety. In that case, design two will handle more accidental loads than design one, under the same requirements.

 

[john.phillip]

Can you explain which design offers more strength ?