Novel Tungsten-Based Composites: Designer Materials for Ultra-High-Rate Deformation and Failure

Abstract

Broadly, the results under this grant are: The thermoviscoplastic behavior of pure polycrystalline tungsten at high rates of deformation was measured. This is the basis for some models of tungsten-based composites. The mechanical behaviors of two modified tungsten phases (made at Penn State and ARDEC) were measured at high rates and high temperatures. A model was developed for this behavior. The mechanical behavior of an alternate matrix material (hafnium) was measured over a wide range of strain rates. The mechanical behavior of a tungsten-hafnium composite was measured using a wide range of strain rates and deformation modes. A model was developed to describe the observed constitutive response, based on the behaviors of the individual phases. A technique was developed for the recovery of samples in high-strain-rate pressure-shear experiments of a material to adiabatic shear localization under superimposed hydrostatic pressure.

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Document Details

Document Type
Technical Report
Publication Date
Dec 01, 1999
Accession Number
ADA386739

Entities

People

  • K. T. Ramesh

Organizations

  • Johns Hopkins University

Tags

Communities of Interest

  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Aspect Ratio
  • Composite Materials
  • Crystal Structure
  • High Temperature
  • Hydrostatic Pressure
  • Materials
  • Materials Processing
  • Materials Science
  • Mechanics
  • Metal Matrix Composites
  • Metals
  • Physics Laboratories
  • Polycrystals
  • Refractory Metals
  • Strain Hardening
  • Strain Rate
  • Tungsten

Fields of Study

  • Materials science

Readers

  • Mechanical Engineering/Mechanics of Materials.
  • Powder metallurgy of Titanium alloys.