Factor of safety


Also found in: Dictionary, Thesaurus, Medical, Financial, Acronyms, Wikipedia.

factor of safety

[′fak·tər əv ′sāf·tē]
(mechanics)
The ratio between the breaking load on a member, appliance, or hoisting rope and the safe permissible load on it. Also known as safety factor.

Factor of safety

A factor used in structural design to provide a margin of safety against collapse or serious structural damage. It allows for any inaccurate assumptions in the loading conditions, inadequate control over quality of workmanship, and imperfections in the materials, but not mathematical errors.

factor of safety, safety factor

1. The ratio of the ultimate stress of a structure or pressure vessel to the design working stress.
2. The ratio of the ultimate breaking strength of a member or piece of material or equipment to the actual working stress or safe load when in use.
References in periodicals archive ?
Step 4: Calculate the fatigue factor of safety by comparing the equivalent alternating stress to the fatigue failure strength.
In compacted mixed soil bearing capacity has direct correlation with factor of safety
Buckling load > Factor of safety x the maximum gas load (Recommended FOS, 3 to 6).
w] on the cover slope stability (assessed through the time- dependent factor of safety against instability, [FS.
They have been evaluated to support HS-20 live loads following current AASHTO procedures for loads, structural capacity and factor of safety when installed per StormTech's Chamber Installation Instructions.
It was their actions which eroded the building''s factor of safety.
The engineer may decide that the bridge needs a factor of safety of 2.