There are no fracturing calculations involved with b_PolyDebris, it simply splits your object into its faces and uses those for a nParticle or nCloth simulation using forces. This reminds me a bit of an old Electric Image plugin called Mr. Nitro which essentially did the same type of thing only with less controls from what I recall.
b_PolyDebris provides a simple interface for controlling debris amount and simple dynamics including wind and gravity with particle simulations as well as Maya nCloth.
The interface is in Korean, however, bbandong provides a little tutorial on b_PolyDebris’ use showing how simple it is to create some pretty cool polygon destruction simulations in Maya using b_PolyDebris.
Check out the page for b_PolyDebris here, where you can download the MEL script and also find out a bit more information on its use.