Question

Which of the following relation is correct?

(a) Permissible Stress = Yield Stress x Factor of Safety

(b) Permissible Stress = Yield Stress / Factor of Safety

(c) Yield Stress = Permissible Stress /  Factor of Safety

(d) Permissible Stress = Yield Stress – Factor of Safety

This question was addressed to me in unit test.

The question is from Design Considerations, Analysis & Methods topic in section Basics of Structural Design of Design of Steel Structures

Answer 1

The correct answer is (b) Permissible Stress = Yield Stress / Factor of Safety

The best I can explain: Permissible Stress = Yield Stress / Factor of Safety. Permissible Stress is the amount of stress that will not cause failure. It is a fraction of yield stress. It takes care of overload or other unknown factors.