Controlled torsional resistance warpable beam

Details Controlled torsional resistance warpable beam Controlled torsional resistance warpable beam

1987-08-10

1988-10-11

Barefoot, Galen

Aeronautics and astronautics

Aircraft structure

Airfoil construction

14 3, 52690, 52693, 52695, B64C 322

Patent

active

047765348

ABSTRACT:
A warpable beam allowing a controlled degree of torsional resistance. The beam is formed with an open cross-section channel-shaped structural element (24) that includes a plurality of planar structural elements (28) or (32) that are positioned within the open section and that define the cross sectional shape. A plurality of diagonal structural element s(46) or (48) positioned transversely within the open section and interfaced with the planar elements transmitting shear across segments. A plurality of points of restraint (50) control the warping of the beam as a result of their relative motion. Further, oppositely inclined diagonal elements in different segments are connected in such a manner as to allow relatively free longitudinal motion while transmitting loads. The beam may be used for bridges or boat docks or as a leading edge spar (57) of an airfoil.

REFERENCES:
patent: 2182366 (1939-12-01), Van Vliet
patent: 3156440 (1964-11-01), Ikeda
patent: 3756541 (1973-09-01), Orazi

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