Effects of Porosity Distribution on the Dynamic Behavior of Two Varieties of SiC

Abstract

In order to understand the microstructural reasons behind variations in ballistic material properties, plate-impact tests were conducted on two sintered silicon carbides with slightly different microstructures. Regular Hexoloy (RH) and Enhanced Hexoloy (EH) were obtained from Saint-Gobain. It was determined that the porosity distribution in EH had fewer large pores leading to an 18% increase in flexural strength over that for RH. Plate-impact experiments were conducted utilizing a VISAR to measure free-surface velocities. Tests were performed on each material to determine the Hugoniot Elastic Limit (HEL) and spall strength. Spall strength was measured as a function of impact stress, and pulse duration. Results show the difference in porosity distribution between EH and RH results in no discernable difference in their HEL values and spall strengths. The spall strengths were independent of pulse width and showed a trend similar to that found in other studies for SiC. Both materials demonstrated finite spall strength above the HEL.

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Document Details

Document Type
Technical Report
Publication Date
Dec 01, 2004
Accession Number
ADA429437

Entities

People

  • Samuel R. Martin

Organizations

  • United States Army Research Laboratory

Tags

Communities of Interest

  • Weapons Technologies

DTIC Thesaurus Topics

  • Carbides
  • Ceramic Materials
  • Chemistry
  • Compound Semiconductors
  • Doppler Effect
  • Elastic Properties
  • Elastic Waves
  • Failure Mode And Effect Analysis
  • Flexural Strength
  • Impact Tests
  • Materials
  • Materials Science
  • Measurement
  • Mechanical Properties
  • Mechanical Working
  • Silicon Carbide
  • Technical Ceramics

Readers

  • Combustion Dynamics and Shock Wave Physics.
  • Mechanical Engineering/Mechanics of Materials.
  • Thin Film Deposition Science.