BEHAVIOR OF NOTCHED FIBERS IN LONGITUDINAL TENSION

Abstract

Devices for cutting notches of controlled depth in monofils, and for manipulating notched specimens under the microscope are described. Notches have been cut in nylon monofils, and the deformation of specimens in the neighborhood of the cracks, when tension (to rupture) is applied, has been examined microscopically. The behavior of the fiber material at the roots of notches is discussed, and interpreted in terms of molecular structure and orientation. It is concluded that two mechanisms are operative in the propagation of a notch or crack to rupture. Tensile tests made on monofils of various diameters, as well as on notched specimens, reveal that breaking strength decreases as the diameter becomes larger. From a plot of the breaking loads of monofils having chordal notches of varying depth an estimate of the equivalent depth of the inherent flaw is obtained.

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Document Details

Document Type
Technical Report
Publication Date
May 01, 1965
Accession Number
AD0464235

Entities

People

  • Arthur B. Coe
  • Dusan C. Prevorsek
  • W. J. Lyons

Tags

Communities of Interest

  • Air Platforms
  • Cyber

DTIC Thesaurus Topics

  • Classification
  • Contracts
  • Diameters
  • Geometry
  • Governments
  • Materials
  • Mechanical Properties
  • Microscopes
  • Military Research
  • Molecular Structure
  • New Jersey
  • New York
  • Orientation (Direction)
  • Plastic Deformation
  • Security
  • Tensile Strength
  • Textiles

Readers

  • Geotechnical Engineering.
  • Materials Science and Engineering.
  • Reinforced Composite Materials