Accession Number : AD0697916

Title :   FLEXURE THEORY OF STRUCTURAL FIBERGLASS BEAMS,

Corporate Author : FOREIGN TECHNOLOGY DIV WRIGHT-PATTERSON AFB OHIO

Personal Author(s) : Kalenderyan,L. I.

Report Date : 17 SEP 1969

Pagination or Media Count : 17

Abstract : Investigations of the linear stress-strain relation in fiberglass beams (particularly in cold-cured ones) revealed their special features: a high sensitivity to shear, a difference between the elasticity moduli in tension and compression, and the linearity of the stress-strain diagram up to failure. The theory of static flexure of fiberglass beams is presented with the effects of the shearing strain and different elastic moduli taken into account. The hypothesis of plane cross sections and the assumption on the smallness of pressure between fibers are used in deriving formulas for normal and tangential stresses. The effect of the shear force on the angle of slope of the elastic curve is evaluated, and a differential equation of flexure is derived which reflects the effects of shear and of the 'bimodularity' of the material. The integration of this equation by the method of initial parameters is explained on an example of an I-beam under a transverse force combined with a concentrated moment. Design formulas for flexural stress analysis are obtained.

Descriptors :   (*GLASS TEXTILES, BEAMS(STRUCTURAL)), (*BEAMS(STRUCTURAL), DEFORMATION), FLEXURAL STRENGTH, STRESSES, STRAIN(MECHANICS), MODULUS OF ELASTICITY, TENSILE PROPERTIES, COMPRESSIVE PROPERTIES, BENDING, SHEAR STRESSES, STRUCTURAL PROPERTIES, DESIGN, USSR

Subject Categories : Ceramics, Refractories and Glass
      Structural Engineering and Building Technology
      Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE