Discussion
A margin of safety of exactly zero means the member is
Answer: A
Correct answer: Adequate, with no reserve
Zero margin means the allowable exactly equals the applied stress: the member carries its design load and not a newton more. That is acceptable and, on a weight-critical structure, desirable - a large positive margin is dead weight. What is not acceptable is a negative margin, which means the member is overloaded at its design condition.
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