> Interestingly enough, some of the highest loads would be imposed if a bearing failure were to stop the engine suddenly at TO power. <
Old One
I hate to get picky because you are generally spot on. But what the heck, you're always willing to learn.
The largest rotor seizure rates recorded occur during the blade off events in a test cell and even in that event their seizure rates are no greater than about 2 X the Ni limit per sec.
Example for a big fan machine this would be a bout 2 X 2500 RPM per sec for a decel rate. The mounts are sized for about twice that rate again for just plain seizure, which if it were ever to occur would plastically twist the drive shaft somewhat. All in all nobody has ever come close to developing pure seizure loads of this maginitude in service for anything bigger than a JT8D except in ground impacts.
On-the-other-hand, if you combine the normal seizure loads with a large unbalance greater than a single fan blade off, you may develop bending moments in conjunction with torque moments that just might break a mount. Thus my comment about a multiple blade loss (with the disk being the fracture point) being tne real risk.
By-the-way, the bearing system can not sustain massive seizure loads so bearing seizures are not a problem. In addition the engine stators can not sustain a massive seizure and will simply start rotating themselves or fracturing completely long before you can shear the mounts in pure seizure torque.