Factor of safety


Factor of safety (FoS) or (FS), is a term describing the structural capacity of a system beyond the expected loads or actual loads. Essentially, how much stronger the system is than it usually needs to be for an intended load. A Factor of safety is a design criteria that an engineered component or structure must achieve. The ultimate strength is the maximum stress that a material can withstand before it breaks or weakens. The Factor of safety is the ratio of the applied stress to the ultimate stress.

Related formulas


FSFactory of safe (dimensionless)
UTSThe ultimate stress (Pa)
RThe applied stress (Pa)