IPL Acceleration Factor

For the IPL model the acceleration factor is given by:

$images\8_2_1.gif$

where,

ˇ $images\luse.gif$ is the life at use stress level,

ˇ $images\laccel.gif$ is the life at the accelerated stress level,

ˇ $images\vu.gif$ is the use stress level,

and

ˇ $images\va2.gif$ is the accelerated stress level.