Spallation and Dynamic Fracture as an Effect of Laser Induced Shock Waves

Abstract

A high irradiance single beam short pulsed Nd: glass laser was used to generate shock waves in 2D carbon-carbon composites. Dynamic brittle fracture at ultra high strain rate was observed as a result of reflected shock waves as tensile waves from the back surface of samples. Successive stages of damage from incipient spallation to complete sample perforation were obtained by increasing gradually the laser energy. The thermo-mechanical damage on the front surface as a result of laser interaction with the target material, and the mechanical damage at the back surface as a result of shock wave reflection were characterized by optical and scanning electron microscopy. The failure properties of the composites were related to the processing of densification and graphitization mode. Keywords: Spallation; Fracture; Composite materials; Carbon carbon composites; Laser target interactions.

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Document Details

Document Type
Technical Report
Publication Date
Jun 22, 1988
Accession Number
ADA198763

Entities

People

  • Irith Gilath
  • Shalom Eliezer

Organizations

  • Israel Atomic Energy Commission

Tags

Communities of Interest

  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Barometric Pressure
  • Carbon Carbon Composites
  • Carbon Fibers
  • Composite Materials
  • Electron Microscopy
  • Failure Mode And Effect Analysis
  • Fibers
  • Glass Lasers
  • Graphitic Materials
  • Laser Targets
  • Lasers
  • Materials
  • Mechanical Properties
  • Microscopy
  • Scanning Electron Microscopy
  • Shock Waves
  • Two Dimensional

Readers

  • Combustion Dynamics and Shock Wave Physics.
  • Pulsed Power and Plasma Physics.
  • Reinforced Composite Materials

Technology Areas

  • Directed Energy
  • Microelectronics