# Combined elastic stress
# Scope: Plane stress von Mises equivalent; no out-of-plane stress.
# Status: illustrative worked example; engineering review pending.
# Inputs are example values. Checks are editable example requirements, not standards.

sigmaX = 80 MPa
sigmaY = 20 MPa
tau = 30 MPa

equivalent := sqrt(sigmaX^2-sigmaX*sigmaY+sigmaY^2+3*tau^2) [MPa]

check equivalent stress budget: equivalent <= 150 MPa

scenario alternative: sigmaX = 64 MPa