Plastic and nonmetallic article shaping or treating: processes – Prestressing solid body and uniting in stressed condition
Patent
1988-12-07
1991-02-26
Thurlow, Jeffery
Plastic and nonmetallic article shaping or treating: processes
Prestressing solid body and uniting in stressed condition
29450, 264258, 264262, 26432818, B29C 4320, B29C 4336, B32B 3106
Patent
active
049960164
ABSTRACT:
The maximum safe operating speed of flywheels and shafts made of low tensile strength material is often determined by the speed at which radial tensile stress exceeds a radial tensile stress limit for the material. Circumferentially wound fiber composite material, for example, has a relatively low tensile strength along the radial direction perpendicular to the fibers. To increase the maximum safe operating speed, it is therefore desirable to form a fiber composite flywheel or shaft with radial compressive prestress. Such a prestressed flywheel or shaft is made by placing a cylinder within a fiber composite annulus, injecting a bonding agent under pressure into the interface between the annulus and the cylinder, and maintaining the bonding agent under pressure while the bonding agent solidifies. Preferably, the cylinder and annulus are aligned in a concentric relationship during solidification by a chamber into which the cylinder and annulus are placed. The rim portion of a flywheel, for example, is formed from an outer ring (the annulus) and an inner ring (the cylinder, which is hollow in this case). The chamber is defined by a pair of plates which abut opposite faces of the rings, and by two concentric cylinders which limit the radial movement of the rings as the rings expand or contract, respectively, in response to the pressure of the bonding agent. The bonding agent is preferably a mixture of epoxy resin and chopped fiber or other randomly oriented epoxy reinforcing material.
REFERENCES:
patent: 3608049 (1971-09-01), Tavella
patent: 4153656 (1979-05-01), Bunyan
patent: 4434125 (1984-02-01), Lavender et al.
Estes Elvin
Gully John H.
Manifold Steve M.
Spann Michael L.
Walls W. Alan
Board of Regents University of Texas System
Tentoni Leo B.
Thurlow Jeffery
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