Effects of Impact Velocity and Stress Concentrators in Titanium on Failure by Adiabatic Shearing

Abstract

This Interim Report covers the contract period from March 25/1999 to June 24/1999 (the third period of three months), During this period the first series of the MDS (Modified Double Shear) specimens have been machined and the main part of experiments has been performed. The experiments were limited in this series to relatively low strain rates in shear, from 10 -3 1/s to sE2 1/s. A fast hydraulic testing machine together with a special device to fix the MDS specimen was used. The oscillograms have been analyzed and variety of test data obtained for the Ti-6Al-4V alloy. It has been found that this alloy is very rate sensitive and the flow stress in this range of strain rates is proportional to the logarithm of strain rate. New series of experiments was%prepared to test this alloy in shear at high-and very high strain rates, up to 10E5 1/s. The measuring system for the impact experiments on MDS specimens was put into operation.

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Document Details

Document Type
Technical Report
Publication Date
Jun 24, 1999
Accession Number
ADA368458

Entities

People

  • J. R. Klepaczko

Tags

DTIC Thesaurus Topics

  • Abstracts
  • Alloys
  • Classification
  • Contractors
  • Contracts
  • Governments
  • Information Operations
  • Materials
  • Mechanics
  • Physical Properties
  • Security
  • Shear Bands
  • Strain Rate
  • Titanium
  • Titanium Alloys
  • United States

Readers

  • Mechanical Engineering/Mechanics of Materials.
  • Metallurgy
  • Technical Research and Report Writing.