Monolithic structure having improved flaw tolerance

Details Monolithic structure having improved flaw tolerance Monolithic structure having improved flaw tolerance

1996-05-31

1999-11-09

Kwon, John T.

Fluid reaction surfaces (i.e., impellers)

Articulated, resiliently mounted or self-shifting impeller...

Nonmetallic resilient mounting

416141, B64C 1112

Patent

active

059802065

ABSTRACT:
A monolithic structural member (10) operative for reacting steady and vibratory bending moment loads M about an applied loads axis X and having a specially configured cross-sectional configuration for providing improved flaw tolerance. The cross-sectional configuration (10) includes a central connecting element (18) and at least one pair of structural ribs (14a, 14b) being integrally formed with the central connecting element (18) and projecting outwardly thereof. The structural ribs (14a, 14b) are, furthermore disposed in the tensile field produced by the steady portion of the bending moment loads M and are proximal to the centroid C.sub.T of the cross-section (10). The cross-sectional configuration (10) defined by the structural ribs and connecting element produces a partial inertia ratio I.sub.X /I.sub.Y greater than or equal to 1.0, which partial inertia ratio I.sub.X /I.sub.Y has the advantageous effect of retarding or arresting crack propagation in the structural member (10). The cross-sectional configuration (10), as adapted for use in a helicopter rotor hub assembly (50), provides improved flaw tolerance and improved clearance between rotor hub assembly components. Specifically, the cross-sectional configuration (10) has a double-tee cross-sectional shape and is employed in areas corresponding to the midsection (64m) of each rotor assembly yoke (64) and shear segments (62) of the hub retention member (52). The double-tee cross-sectional configuration (10) facilitates higher flapwise and edgewise angular excursions between the yoke (64) and hub retention member (52) thus providing greater design flexibility and/or reducing the size and weight of the rotor hub assembly (50).

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