On Microcrack Growth and Arrest in Simulated Fibrous Composites.

Abstract

Opening, shearing and combined mode fracture tests were conducted with long rectangular strips of plexiglas clamped on the long edges and containing centered and off-centered cracks. The critical stress intensity factors, crack initiation angles, and crack paths were evaluated. Fractured surfaces were then examined as to crack behavior. The maximum energy release rate criterion was extended to problems with a large degree of shearing mode present. This criterion was then used to predict successfully the initial and subsequent crack propagation behavior presented in the experimental work. Crack arrest was examined for this rigid grip configuration. Using in part information obtained from these studies, a flexible fiber model was investigated to determine the effect of fiber bending on crack behavior. Certain aspects of crack growth and arrest in these idealized fiber models were explored. (Author)

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Document Details

Document Type
Technical Report
Publication Date
Dec 01, 1976
Accession Number
ADA040618

Entities

People

  • Nicholas Conrad

Organizations

  • Texas A&M University

Tags

Communities of Interest

  • Air Platforms
  • Energy and Power Technologies
  • Weapons Technologies

DTIC Thesaurus Topics

  • Air Force
  • Birds
  • Composite Materials
  • Finite Element Analysis
  • Geometry
  • Material Degradation Processes
  • Materials
  • Materials Laboratories
  • Materials Science
  • Materials Testing
  • Mechanical Engineering
  • Mechanics
  • Military Research
  • Numerical Analysis
  • Physics Laboratories
  • Plastics
  • Stress Intensity Factors

Readers

  • Materials Science (Mechanical Engineering).
  • Structural Dynamics.