The ratio of the maximum strength of a piece of material or a part to the probable maximum load to be applied to it.

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Factor-of-safety Sentence Examples

ordinary steel rope has a breaking strength of about 32 tons, which, with a' factor of safety of six gives a safe working load of 54 tons.

Soft steel is used for rivets always, and sometimes for the whole superstructure of a bridge, but medium steel more generally for the plates, angle bars, &c., the weight of the bridge being then reduced by about 7% for a given factor of safety.

The committee recommended that a factor of safety of 4 should be taken for wind stresses.

divided by the factor of safety.

It was pointed out as early as 1869 (Unwin, Wrought Iron Bridges and Roofs) that a rational method of fixing the working stress, so far as knowledge went at that time, would be to make it depend on the ratio of live to dead load, and in such a way that the factor of safety for the live load stresses was double that for the dead load stresses.