On the Resistance of Ceramics to High Velocity Penetration

Abstract

It is known that high velocity penetration for ductile materials can be represented analytically by a modified hydrodynamic theory. The strength term for the target corresponds to the pressure required to expand a cavity, if the dynamic yield strength is substituted for the static yield strength. Indentation pressures are closely related to the cavity expansion pressures. In this paper it is shown that the key parameters for indentation in brittle materials are similar to but not identical to those for ductile materials. The strength terms for ceramics as measured in ballistic tests are much lower than would be predicted on the basis of the indentation measurements. It is found that the ratio of the target strength term to hardness increases as the fracture toughness of the targets increases. The findings on penetration resistance are used together with cavity expansion theory to estimate the relative size of the craters in ceramic targets. Keywords: Ceramic materials, Mathematical models, Ceramic armor. (kt)

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Document Details

Document Type
Technical Report
Publication Date
Jul 01, 1988
Accession Number
ADA197320

Entities

People

  • Joseph Sternberg

Organizations

  • Naval Postgraduate School

Tags

Communities of Interest

  • Weapons Technologies

DTIC Thesaurus Topics

  • Ceramic Materials
  • Composite Materials
  • Elastic Properties
  • Failure Mode And Effect Analysis
  • Fiber Reinforced Composites
  • Fluid Flow
  • Hardness
  • Materials
  • Measurement
  • Mechanical Properties
  • Mechanical Working
  • Mechanics
  • Modulus Of Elasticity
  • Optical Materials
  • Resistance
  • Target Strength
  • Yield Strength

Readers

  • Fluid Dynamics.
  • Materials Science (Mechanical Engineering).
  • Reinforced Composite Materials