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LOAD TRANSFER MECHANISM FOR A TURBINE DISKThe NASA Marshall Space Flight Center has developed a load transferring system for transferring loads from a turbine shaft to a turbine disk and vice versa. In turbomachinery it is usually necessary to attach turbine disks to a turbine shaft for either having the shaft drive the disk or the disk drive the shaft. Composite disks offer better results in some operations but are more sensitive to stress risers than metallic discs. Thus, it is sometimes necessary to secure a backup disk, having the required strength, to the shaft and provide some means for locking the composite disk to the backup disk. Bolts have been used for locking the backup disk to the composite disk but the bolt holes in the composite disk are stress risers that can eventually lead to failure of the composite disk. Other methods of attaching the backup disk to the composite disk present other problems. Benefits
Potential Commercial Uses
The Technology
A
load transferring system wherein a composite turbine disk mounted on
a shaft is in contact with a backup disk that is secured to the shaft.
The turbine disk is made of layers of woven graphite fibers held in
a rigid configuration in a ceramic matrix. The use of carbon fibers
includes the use of regular carbon fibers or graphite fibers. The composite
disk has a plurality of lugs that have generally trapezoidal cross sections
when cut by planes that are perpendicular to each other, with both planes
being normal to the disk. The backup disk is provided with recesses
that are the negative of the trapezoidal lugs to lock the two disks
together. A second backup may be secured to the shaft to secure the
composite turbine disk between the backup disks. While a composite disk
is described above, the disk may be made of a ceramic material.
.gif) Patent Number6,162,019 Contact for Licensing Information
Technology Transfer Department
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