Discussion
A member with an allowable stress of \( 480 \) MPa is working at \( 240 \) MPa. Its margin of safety is
Answer: C
The margin of safety is the allowable divided by the applied, less one, so \( 480/240 - 1 = 1.0 \). A margin of zero means the member is exactly at its allowable, and a negative value means it fails, so margins are quoted to show how much is in hand.
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