Behavior of Materials in a Dynamic Environment: Summary of Phase II Results

Abstract

A theoretical and experimental study was conducted on stress waves and ballistic performance of weakly coupled stacks of AlN tiles bonded by thin polyurethane films. The cylindrical projectile was made of tungsten alloy with L/D = 6 weighing 61g at a velocity close to 1170 m/s striking the stack centrally. Total thickness of the stack ranged between 3" and 1.5", and with individual tile thicknesses of 1.5", 0.75", 0.5" and 0.25". Ballistic performance was evaluated by the DOP method into an aluminum block. For the 1.5" unconfined stack, DOP of the monolith was highest with substantial scatter, while DOP of the 0.75" layer stack was lowest with reduced scatter. DOP then rises smoothly for the 0.5" and 0.25" layer stacks while scatter is reduced further. Trends of this behavior is partly explained by analysis valid up to crack initiation. An important feature of all DOP results is the dominance of self-confinement.

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Document Details

Document Type
Technical Report
Publication Date
Jul 01, 1999
Accession Number
ADA370577

Entities

People

  • K. Weber
  • M. El-raheb
  • V. Hohler

Tags

Communities of Interest

  • Air Platforms
  • Energy and Power Technologies
  • Sensors
  • Weapons Technologies

DTIC Thesaurus Topics

  • Cartesian Coordinates
  • Ceramic Materials
  • Composite Materials
  • Computational Science
  • Computer Programs
  • Differential Equations
  • Elastic Properties
  • Elastic Waves
  • Equations Of Motion
  • Geometry
  • Laminates
  • Materials Testing
  • Mechanics
  • Modal Analysis
  • Resonant Frequency
  • Stress Waves
  • Two Dimensional

Readers

  • Aerospace Research.
  • Combustion Dynamics and Shock Wave Physics.
  • Materials Science (Mechanical Engineering).