flapping madly
I'll send along a pdf in a moment.
Turbine D
I doubt there was fusing of the Metallic bits at the Rim (IPT). First, the speed at which they travel, and the relatively low mass they contain (relative to the Drive Arm) don't allow for time on station to effect a puddle. The Stator Vanes Platform describes a cylinder (barrel) with only its rim effacing the IPT Rim/Blades' roots. The Rim(s) are closer to one another than the Drive Arm/Stator Ring. Thus the Blades would leave, concurrently with the disintegration of the Platform (and its aft fixed Vanes), prior to DA melt. I feature the Drive Arm slipping aftward until the IP Rim contacts the NGV Platform. This conflict shatters the platform as the Blades unroot. The Drive Arm continues aft into the Stator Ring, where melting and Fracture occur simultaneously. Once fractured, the Wheel itself splits in threes, and blows out the case. Loss of Blades cause Stall (HPT)(Bang 1), and the blow out of the case causes the second "bang".
The metal deposition at the flaring Bore, comes from the melted remnants of the Drive Arm Join with the bearing sleeve. The "Foldback" ( of portions of the edges of the Drive Arm) have to do with your poser re: insufficiently ductile metal permanently deformed??
I'd have to say two elements needed would be "Heat, and Hammer".
We need to remember that the supports that mount the Stator Ring to the Case were a constant problem, vis a vis the fastening bolts. The bolts were chronically coming loose..A guess at their looseness would be dramatic vibration in this area.
Last edited by bearfoil; 28th January 2011 at 22:08.