Accession Number : ADA305314

Title :   Stress Concentrations in Filament-Stiffened Sheets of Finite Length.

Descriptive Note : Technical note,

Corporate Author : NATIONAL AERONAUTICS AND SPACE ADMINISTRATION HAMPTON VA LANGLEY RESEARCH CEN TER

Personal Author(s) : Fichter, W. B.

PDF Url : ADA305314

Report Date : NOV 1970

Pagination or Media Count : 17

Abstract : A simple model of filamentary composite material is employed to investigate stress concentrations in a filament-stiffened sheet of finite length. The model is composed of a single layer of parallel, tension-carrying filaments embedded in a shear-carrying matrix. The sheet is of finite length in the filament direction and of infinite length normal to the filament direction. Filament stress-concentration factors are calculated as functions of the number of broken filaments and a length-stiffness parameter for the cases of uniform normal edge load and uniform normal edge displacement. In the uniform-edge-load case, the stress-concentration factors are found to increase with decreasing filament length. The opposite effect is noted in the uniform-edge-displacement case where, in addition, the stress-concentration factor is found to have an upper limit which is fixed by the value of the length-stiffness parameter.

Descriptors :   *COMPOSITE MATERIALS, *STRESS CONCENTRATION, LAYERS, PARAMETERS, EDGES, STIFFNESS, DISPLACEMENT, LIMITATIONS, LENGTH, FILAMENTS.

Subject Categories : Laminates and Composite Materials

Distribution Statement : APPROVED FOR PUBLIC RELEASE