Notch_sensitivity
Notch_sensitivity(Material$, Load$, r, S_ut)
The function Notch_sensitivity returns the notch sensitivity (q). The fatique stress-concentration factor (K_f) can be calculated from the notch sensitivity (q) and the (static) stress-concentration factor (K_t) according to:
K_f = 1 + q (K_t - 1)
Input:
Material$ = type of material
'Aluminum_alloys' = aluminum alloys
'Steels' = steels
'Cast_irons' = cast iron
Load$ = type of load
'Axial' = reversed axial loads
'Bending' = reversed bending loads
'Torsion' = reversed torsional loads
r = radius of notch ([m] or [ft])
S_ut = ultimate tensile strength ([MPa] or [ksi])
Output:
Returns the dimensionless notch sensitivity.
Example:
$Load Mechanical Design
$UnitSystem SI Mass J K Pa
Material$='Cast_irons'
Load$='Steels'
r=3 [mm]*convert(mm,m)
S_ut=560 [MPa]
q=notch_sensitivity(Material$,Load$,r, S_ut)
{Solution:
q = 0.8484}
Reference: Budynas, R.G. and J. Keith Nisbett, Shigley's Mechanical Engineering Design, 11th Edition, McGraw Hill, New York, (2020).