# Thick-wall cylinder elastic stress
# Scope: Lame inner-surface hoop stress; outer pressure zero and long elastic cylinder.
# Status: illustrative worked example; engineering review pending.
# Inputs are example values. Checks are editable example requirements, not standards.

pressure = 10 MPa
inner = 20 mm
outer = 30 mm

hoop := pressure*(outer^2+inner^2)/(outer^2-inner^2) [MPa]

check stress budget: hoop <= 100 MPa

scenario alternative: pressure = 8 MPa