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Fabricating large, thick wall, tubular structures
| Details |
Inventors: Gill, Dee R.; Hikida, Edward T.; Radice, Daniel M.;
Assignee: Hercules Incorporated (Wilmington, DE)
Primary Examiner: Ball; Michael W.
Assistant Examiner:
Attorney, Agent or Firm: Ross, Jr.; Edmund C.
This invention relates to an improvement in filament winding large, hollow, tubular structures having significant axial reinforcement in their thick walls by means including (a) using a hollow, light weight mandrel adapted to expand radially at elevated temperatures and windings of alternate layers of filamentary materials positioned substantially axially and substantially circumferentially relative to the longitudinal axis of the mandrel wherein the alternate layers are preferably in a certain thermosettable resin matrix and wound in certain fashion and (b) heating the filament wound mandrel to cure the thermosettable resin wherein heat from inside and out of the mandrel controls the cure and expansion during the heating step. The thick walls preferably incorporate graphite fibers for significant strength in the reinforcement provided by the filamentary materials. |
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DETAILED DESCRIPTION OF THE INVENTION Tubular structures that are made in accordance with this invention include those between about 7 to 15 meters long, 1 to 3 meters in diameter and 2 to 6 centimeters in wall thickness and can be made even larger.
The tubular structures have reinforcements by filamentary materials, such as carbon or graphite fibers, in a matrix of thermoset resin having a void content of about 6.
5% by weight or less.
These filaments are primarily positioned relatively axially and relatively circumferentially relative to a center longitudinal axis in each of the structures.
FIG.
1 depicts light weight, hollow mandrel 10 which can be made of aluminum and has been used in fabricating several of the structures of this invention.
FIG.
1 is a side elevational view of mandrel 10, broken between its left and right ends 12,12' through its partially cutaway cylindrical center section 15.
Left and right ends 12,12' have symmetry; they are hereinafter described together with right end elements denominated as the primes (') of those of the left.
Mandrel 10 is supported in a conventional filament winding apparatus.
Arbors 14,14' of the filament winding apparatus are shown in FIG.
1 axially extending from the left and right ends 12,12' of mandrel 10, respectively.
Arbors 14,14' bolt or otherwise are affixed to adapters 16,16', respectively, of mandrel 10.
Adapters 16,16' bolt around their peripheries to respective left and right perforated disk end plates 18,18' which are perforated to receive chucking from the aforementioned filament winding apparatus.
Perforated disk end plates 18,18' bolt, in turn, to left and right hubs 20,20' which are hollow.
Hubs 20,20' carry spokes 22A through 22L, 22A' through 22L'.
Spokes 22A through 22G are shown in FIG.
1 and these as well as 22H through 22L, are shown in FIG.
3.
Spokes 22A' through 22G' appear in FIG.
1 and 22G', 22H' and 22I' are seen in FIG.
4, 22J' through 22L' not shown in the drawings.
Spokes 22A through 22L, 22A' through 22L', respectively, extend rigidly between the circumference of left and right hubs 20,20' to the periphery of left and right perforated plates 24,24'
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Cooking 
