Stress Concentrations in Filament-Stiffened Sheets of Finite Length.

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.

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Document Details

Document Type
Technical Report
Publication Date
Nov 01, 1970
Accession Number
ADA305314

Entities

People

  • W. B. Fichter

Organizations

  • Langley Research Center

Tags

Communities of Interest

  • Air Platforms

DTIC Thesaurus Topics

  • Aeronautics
  • Aircraft Design
  • Boundaries
  • Composite Materials
  • Digital Computers
  • Displacement
  • Engineering
  • Equations
  • Fail Safe
  • Filaments
  • Materials
  • Numerical Integration
  • Stiffness
  • Stress Concentration
  • Stresses
  • Structural Components

Readers

  • Fluid Dynamics.
  • Materials Science (Mechanical Engineering).
  • Reinforced Composite Materials