Factor of Safety

#### Ultimate Tensile Stress (5)

• The highest amount of stress a material can withstand.
• This is usually during the Necking Down process.

#### Factor of Safety

• Since a material should be working at stresses under its breaking point, the Factor of Safety is how much tolerance is given to a material.
• This can be found by:
(1)
\begin{align} FoS = \frac{UTS}{\sigma_{max}} \end{align}

Where:

• FoS is the Factor of Safety (ratio)
• UTS is the material's Ultimate Tensile Stress (Pa)
• $\sigma_{max}$ is the maximum stress the material is likely to encounter (Pa)

ปลวก

• Within a system, there needs to be a compromise between a high Factor of Safety and the Efficiency of the system.
• Any system definitely should have a FoS above 1.
page revision: 1, last edited: 19 Apr 2015 18:32