Determination of Mechanical Properties of Materials at High Cyclic Loading and Elevated Temperatures.

Abstract

Preliminary developmental work was performed to devise a method of determining material properties of gun tube materials subjected to the high cyclic rate loading and the elevated temperatures that exist in automatic weapons firing. A single-shot test fixture, consisting of a modified gun that exerted high hydraulic pressures in a specimen with a 3 to 1 differential piston, was designed, built, and tested. Results with this low-temperature, single-shot fixture for pressures of 62,000 psi are presented. An improved multi-shot gun fixture consisting of a Browning caliber .50 M2 machine gun (with the material specimen replacing a portion of the barrel) has been developed through the initial stages of testing. With live rounds, single-shot pressures of 55,000 psi with .1 millisecond rise times and pulse widths of 2 milliseconds were generated; these results are presented. (Author)

Document Details

Document Type
Technical Report
Publication Date
Jul 01, 1971
Accession Number
AD0734843

Entities

People

  • Irvin F. Gerks

Tags

DTIC Thesaurus Topics

  • Automatic Weapons
  • Cyclic Rate
  • Guns
  • Hydraulic Pressure
  • Low Temperature
  • Machine Guns
  • Materials
  • Mechanical Properties
  • Test Fixtures
  • Weapons

Readers

  • Mechanical Engineering/Mechanics of Materials.
  • ballistics.