Accession Number : AD0699730

Title :   NONLINEAR BENDING BEHAVIOUR OF SLIT, THIN-WALLED TUBES WITH AN ARBITRARY SLIT LOCATION,

Corporate Author : TORONTO UNIV (ONTARIO) DEPT OF MECHANICAL ENGINEERING

Personal Author(s) : Rimrott,F. P. J. ; Iyer,K. R. P.

Report Date : 1968

Pagination or Media Count : 6

Abstract : Bending of slit, thin-walled tubes, of the type that find increasing use as antennas in spacecraft applications, leads to secondary effects consisting of shrinking of the tube diameter and distortion of the tubular cross-section. These effects are dependent upon the location of the slit with respect to the neutral plane. The bending moment for the tube as well as tangential and radial displacements of the tube cross-section have been determined as function of the slit position and a given curvature. The bending moment is shown to be a nonlinear function of the two independent variables. The curvature at instability is derived for a fixed slit position and the associated bending moment is determined. Experiments were conducted, whose agreement with the theoretical prediction is good up to the event of contact of the inner lip with the tube wall, after which the tubes become stronger than predicted by the present theory, which does not take lip contact into consideration. Finally the tendency of long slit tubes to twist when subjected to a pure bending moment is noted and discussed. (Author)

Descriptors :   (*SPACECRAFT COMPONENTS, SLOT ANTENNAS), (*SLOT ANTENNAS, PIPES), (*PIPES, BENDING), SATELLITE ANTENNAS, DISTORTION, RESPONSE, NONLINEAR SYSTEMS, CURVED PROFILES, DEFORMATION, CANADA

Subject Categories : Electrical and Electronic Equipment
      Pumps, Filters, Pipes, Tubing, Fittings & Vlvs
      Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE