# Shaft-hub interference fit
# Scope: Frictional torque from supplied interface pressure; pressure is not solved.
# Status: illustrative worked example; engineering review pending.
# Inputs are example values. Checks are editable example requirements, not standards.

pressure = 10 MPa
diameter = 20 mm
length = 25 mm
friction = 0.15

normal := pressure*pi*diameter*length [N]
capacity := friction*normal*diameter/2 [N*m]

check torque target: capacity >= 20 N*m

scenario alternative: pressure = 8 MPa