Accession Number : AD0483656

Title :   STRESS DISTRIBUTION AND DEFORMATION IN A TWISTED BLADE UNDER COMBINED TENSION AND TORSION.

Descriptive Note : Master's thesis,

Corporate Author : NAVAL POSTGRADUATE SCHOOL MONTEREY CA

Personal Author(s) : Hogan, Lawrence Miles

Report Date : MAY 1966

Pagination or Media Count : 80

Abstract : Theoretical expressions were developed to relate the deformation of a twisted blade of rectangular cross section and constant rate of twist to an applied load and moment. These expressions were found to be linear for the rates of twist investigated and depended only on the blade material and geometry. The theoretical strain distribution was found to be essentially parabolic across the chord, with the shape determined by the initial twist rate and the angular deformation. The experimental investigation was conducted with three specimens of constant cross sectional aspect ratio but different rates of twist. Correlation with theory was found to be excellent for the chordwise distribution of strain and generally good for the linear relationships linking the deformation with the applied loads.

Descriptors :   (*BLADE AIRFOILS, TWIST(AERODYNAMICS)), (*TURBINE BLADES, TWIST(AERODYNAMICS)), STRESSES, DISTRIBUTION, LOAD DISTRIBUTION, DEFORMATION, TENSILE PROPERTIES, TORSION, THEORY, LOADS(FORCES), MOMENTS, STRAIN(MECHANICS), MEMBRANES, HELIXES, MODULUS OF ELASTICITY, ALUMINUM.

Subject Categories : Aircraft
      Mechanics
      Jet and Gas Turbine Engines

Distribution Statement : APPROVED FOR PUBLIC RELEASE