# Fatigue-life screening
# Scope: Linear Goodman screen using supplied material limits; not cycle-life prediction.
# Status: illustrative worked example; engineering review pending.
# Inputs are example values. Checks are editable example requirements, not standards.

alternating = 50 MPa
mean = 30 MPa
endurance = 150 MPa
ultimate = 400 MPa

utilization := alternating/endurance+mean/ultimate
factor := 1/utilization

check Goodman screen: utilization <= 1

scenario alternative: alternating = 40 MPa