Accession Number : AD0011549


Title :   AN EXPERIMENTAL STUDY OF A TRANSVERSELY STIFFENED TAPERED BOX GIRDER UNDER TORSION AND BENDING


Corporate Author : AERONAUTICAL RESEARCH COUNCIL LONDON (UNITED KINGDOM)


Personal Author(s) : Falconer, Bruce H


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/011549.pdf


Report Date : 16 Aug 1952


Pagination or Media Count : 62


Abstract : The strain distribution in a moderately tapered (10%), transversely stiffened, thin-walled Duralumin box was tested under torsion and/or bending. Direct and shear-strain distributions were measured around representative cross sections with electric resistance strain gages. Comparisons of the test data with theoretical analyses indicated that: (1) maximum direct strains at the root (under shear loads) exceed conventional beam-theory predictions by as much as 20%; and (2) the maximum shear strain immediately inboard of the innermost loading section (under torque) exceeds the theoretical predictions by 34%. Analyses are included which treat the box as (1) an equivalent 4-boom tube and (2) a tube with direct stress-carrying covers. Both gave equally good estimates of the torsional-load strains, and neither interpreted the strain lag under shear loads. Photographs are included of the test box and assembly, loading linkage, and strain-measuring equipment. Tabulated data are presented for loadings and measurement sections and for the percentage deviation of maximum experimental strains from maximum strains of the elementary theory. Superimposed curves for comparing the theoretically predicted strains are appended together with reviews of the theoretical methods.


Descriptors :   *TORSION , TEST AND EVALUATION , MEASUREMENT , METHODOLOGY , EXPERIMENTAL DATA , THEORY , STRAIN(MECHANICS) , BOXES , SHEAR STRENGTH , SHEAR STRESSES , CROSS SECTIONS , STRAIN GAGES , TABLES(DATA) , ELECTRICAL RESISTANCE , LINKAGES , TORQUE


Subject Categories : Mechanics


Distribution Statement : APPROVED FOR PUBLIC RELEASE