Accession Number:

ADA058479

Title:

Dynamic Fracture in Orthotropic Fiber Composites.

Descriptive Note:

Annual rept. no. 1(Final), Apr 77-Apr 78,

Corporate Author:

H H AEROSPACE DESIGN CO INC NEW YORK

Report Date:

1978-05-01

Pagination or Media Count:

103.0

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

Subject Categories:

  • Laminates and Composite Materials
  • Mechanics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE