Factor of Safety is the Ratio of
Factor of safety (F.O.S) is known as the ratio of ultimate strength to the design strength ( Working stress). It is a constant factor that is considered for designing of machine components or structures beyond their working strength.
F.O.S = Ultimate strength/Design strength
Factor of safety is also known as the ratio of the failure stress to the allowable stress. The stress which is used in the design of components is known as allowable stress. It is the stress, that the designer expects will not be surpassed by the normal operating conditions.
For ductile material, allowable stress is σal = σyt/(f)s
For brittle material, allowable stress is σal = Sut/(f)s
Summary
Factor of Safety is the Ratio of
To save the designed components from failure, it is necessary to give some reserve strength. This is attained by considering a suitable factor of safety during designing.
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