When available, take the value from a 4-point bend test. One of the methods to reduce maximum stress is to keep the strain energy in the beam constant while changing the beam profile. Additional beam profiles are trapezoidal, tapered and torsion. The Von Mises yield criterion states that yielding occurs when the Von Mises stress, exceeds the yield strength in tension. Finite Element Analysis stress results use Von Mises stresses.
Safety factor is a function of design stress and yield strength.
The following equation denotes safety factor, f s . Where Y S is the Yield Strength and D S is the Design Stress. Table 5 lists the critical material mechanical properties. Hardness testing monitors process operations such as cold working, solution annealing, and age hardening. A hardness test does not measure a well-defined material mechanical property but provides a useful approximation.