
Accession Number : ADA305314
Title : Stress Concentrations in FilamentStiffened 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 filamentstiffened sheet of finite length. The model is composed of a single layer of parallel, tensioncarrying filaments embedded in a shearcarrying matrix. The sheet is of finite length in the filament direction and of infinite length normal to the filament direction. Filament stressconcentration factors are calculated as functions of the number of broken filaments and a lengthstiffness parameter for the cases of uniform normal edge load and uniform normal edge displacement. In the uniformedgeload case, the stressconcentration factors are found to increase with decreasing filament length. The opposite effect is noted in the uniformedgedisplacement case where, in addition, the stressconcentration factor is found to have an upper limit which is fixed by the value of the lengthstiffness 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