Dynamic Fracture in Orthotropic Fiber Composites.
Annual rept. no. 1(Final), Apr 77-Apr 78,
H H AEROSPACE DESIGN CO INC NEW YORK
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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
- Laminates and Composite Materials