Design stress
First of all, what is stress:
lF/A =s (Force/Area)
Design Stress, sd
lUsed to account for uncertainties in material properties and inexact information about loadings
lIf loading is static, or
material is ductile then sd = N’*sc (maximum stress
calculated * a design factor)
lEngineer should select a material with a yield strength,Sy, of at least sd.