Originally Posted by
pax2908
esp @tdracer (off topic) re. rotor burst. A while ago we saw photos of a large blade fragment stuck in the "containment belt" (proper term = ?) Would you think this could have been the "root cause" (how come it was not dislodged by the rest?) When you say fan disc designed not to fail, does that include when N-1 blades keep hitting a rigid obstacle until the fan stops turning?
Two ways for the blade w root to get in belt by itself.
Walk out under extreme vibratory loads with disk intact (ala NA CF6 in Albuquerque
Slip out when crack that breaks the disk opens up between OD and ID
The Kevlar belt will give a couple of feet outwards as the rotor pushes outward leaving lots of room for lesser debris to escape being driven through the Kevlar. The rest of the metal case the Kevlar is wrapped around just gives up right away