Template:Ipl ex mean

Mean or MTTF
The mean, $$\overline{T},$$  or Mean Time To Failure (MTTF) for the IPL-exponential relationship is given by:


 * $$\begin{align}

& \overline{T}= & \int_{0}^{\infty }t\cdot f(t,V)dt=\int_{0}^{\infty }t\cdot K{{V}^{n}}{{e}^{-K{{V}^{n}}t}}dt =\ \frac{1}{K{{V}^{n}}} \end{align}$$

Note that the MTTF is a function of stress only and is simply equal to the IPL relationship (which is the original assumption), when using the exponential distribution.