Development of a Testing Technique for the Yield Strength Determination of 5 Inch Steel Cartridge Cases

Abstract

The standard Navy method for determining the yield strength of 5 inch steel cartridge cases is shown to overestimate the actual circumferential yield strength of the case by about 40 percent. An expanding ring testing apparatus was developed to measure the actual yield strength. Comparison of this strength with the yield strength measured at different stages of the standard flat tensile sample preparation method revealed that the major cause for the difference is the stress relieving treatment given to the flattened tensile specimens. The increase in the strength during the stress relieving is believed to be due to the precipitation of epsilon carbide and the resulting precipitation hardening.

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Document Details

Document Type
Technical Report
Publication Date
Sep 01, 1983
Accession Number
ADA136399

Entities

People

  • J. A. Blasko

Organizations

  • Naval Postgraduate School

Tags

Communities of Interest

  • Human Systems

DTIC Thesaurus Topics

  • Cartridge Cases
  • Cold Working
  • Complex Adaptive Systems
  • Dispersion Hardening
  • Fluids
  • Hardness
  • Heat Treatment
  • Machines
  • Mechanical Working
  • Precipitation
  • Recording Systems
  • Standards
  • Stress Relieving
  • Tensile Strength
  • Tensile Testing
  • Test Methods
  • Yield Strength

Fields of Study

  • Materials science

Readers

  • Environmental Engineering
  • Materials Science (Mechanical Engineering).
  • Systems Analysis and Design