Safety Factor & Margin
Calculate factor of safety and margin of safety from an allowable stress and an applied stress. This keeps the aerospace sign convention explicit: positive margin means reserve remains.
Factor of safety
2.500
Allowable / applied
Margin of safety
1.500
FOS - 1
Utilization
0.400
Applied / allowable
Stress reserve
Reserve remains
Stress reserve
Reserve remains
Inspect the applied marker, allowable marker, or reserve span.
Reserve stress
180.00 MPa
Limit crossing
300.0 MPa
Interpretation
Reserve remains
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