DETERMINATION OF SPALLATION THRESHOLDS BY EXPLODING FOIL TECHNIQUES

Abstract

Exploding foil techniques were used to accelerate a Mylar flyer at a controlled velocity to produce a plane, longitudinal shock wave in 6061-T6 aluminum, and the interaction of the wave with the target free surface was studied. Flyer velocity and planarity were determined by high-speed, photographic techniques. The spall threshold was determined as a function of flyer velocity and thickness. A criterion was formulated to predict the spall threshold. Microscopic analyses revealed the mechanism of incipient spall in 6061-T6 aluminum to be cracks which propagated from inclusions in the matrix material.

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Document Details

Document Type
Technical Report
Publication Date
Jun 01, 1968
Accession Number
AD0838386

Entities

People

  • Jose R. Baca

Organizations

  • Air Force Institute of Technology

Tags

Communities of Interest

  • Air Platforms
  • Weapons Technologies

DTIC Thesaurus Topics

  • Acoustic Impedance
  • Air Force
  • Air Force Facilities
  • Aluminum
  • Cameras
  • Classification
  • Elements
  • Energy
  • Geometry
  • High Pressure
  • Literature Surveys
  • Materials
  • Measurement
  • Metals
  • Photographs
  • Stress Waves
  • Thickness

Fields of Study

  • Physics

Readers

  • Combustion Dynamics and Shock Wave Physics.
  • Structural Health Monitoring of Composite Structures.