Showing papers on "Bend radius published in 1970"

Filament reinforced gas turbine blade

Abstract: A filament reinforced gas turbine engine blade having a divergent root defined by a particular splay radius comprising oriented high modulus, high strength nonductile first reinforcing filaments embedded in a matrix and forming a radius of curvature greater than the splay radius and no smaller that its working radius, and oriented high strength ductile second reinforcing filaments embedded in a matrix and forming a radius of curvature which is equal to or less than the splay radius with no loss of strength therein.

GaAs lasers utilizing light propagation along curved junctions

Abstract: A junction laser in which the light propagation within the device is along curved-junction paths is reported here. Path curvatures with radii ranging from 0.25 to 1.00 mm were obtained by the intentional introduction of curved diffused junctions. It was found that for radii of curvature smaller than a critical value of about 0.4 mm, the threshold-current density increases very rapidly. This value is in good agreement with the theoretical value, which is obtained by assuming that the gradient of the refractive index across the GaAs junction determines the minimum bending radius for low-loss propagation. The design of these curved-junction devices is critically dependent on the suppression of lasing along undesired junction paths perpendicular to the desired direction by bending these paths through a smaller than critical radius.