Dynamic Fracture in Orthotropic Fiber Composites.

Abstract

The underlying principles of dynamic fracture and crack arrest in fiber composites are reviewed in terms of the conservation of mechanical energy. An approximate Mode 1 dynamic crack extension force for a highly orthotropic 0 degree unidirectional fiber composite is derived. The governing partial differential equations for dynamic crack propagation in double cantilever beam unidirectional composite specimens are derived. A finite-difference scheme for solving these equations is presented along with the stability and convergence criteria for a numerical solution. A conductive grid system for measuring the crack-tip velocity profile is described. This system is capable of assisting in the measurement of the dynamic fracture toughness of fiber composites. (Author)

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Document Details

Document Type
Technical Report
Publication Date
May 01, 1978
Accession Number
ADA058479

Entities

People

  • James H. Williams Jr.
  • Petros N. Kousiounelos
  • Samson S. Lee

Tags

Communities of Interest

  • Energy and Power Technologies
  • Space
  • Weapons Technologies

DTIC Thesaurus Topics

  • Abstracts
  • Composite Materials
  • Crack Propagation
  • Crack Tips
  • Cracks
  • Differential Equations
  • Displacement
  • Energy
  • Epoxy Laminates
  • Fracture (Mechanics)
  • Laminates
  • Materials
  • Materials Laboratories
  • Mechanical Energy
  • Mechanics
  • Partial Differential Equations
  • Stresses

Readers

  • Finite Element Method (FEM) for solving Partial Differential Equations (PDEs)
  • Structural Health Monitoring of Composite Structures.