PROGRESSIVE STRESS DAMAGE AND STRENGTH OF CENTRIFUGALLY CAST, COLDWORKED GUN TUBES

Abstract

The report presents the results of the hydraulic fatigue tests of centrifugally cast coldworked 75 and 76mm. gun tubes made of steel. In order to obtain data which the engineer could use in designing for resistance to progressive stress damage, test cylinders with wall ratio ranging from 1.2 to 1. 8 were used. In the preparation of the test cylinders considerable metal was removed from the outside surface of the coldworked rifled tube. The yield strength of some of these test cylinders was therefore measured in order to determine the influence of the removal of the coldworked metal upon strength. The slope of the elastic expansion curve of the cylinders was also calculated and compared with the theoretical one based on 30,000,000 psi as being the value for Young's modulus. The resistance to progressive stress damage of the coldworked tubes was compared with that of heattreated-to-strength centrifugal castings and forgings in order to evaluate the benefit of coldworking.

Open PDF

Document Details

Document Type
Technical Report
Publication Date
Jun 17, 1949
Accession Number
AD0618135

Entities

People

  • Donald H. Newhall
  • Peter R. Kosting

Tags

Communities of Interest

  • Air Platforms
  • Energy and Power Technologies
  • Ground and Sea Platforms
  • Weapons Technologies

DTIC Thesaurus Topics

  • Cold Working
  • Elastic Properties
  • Failure Mode And Effect Analysis
  • Fatigue Tests (Mechanics)
  • High Pressure
  • Internal Pressure
  • Materials
  • Mechanical Properties
  • Mechanical Working
  • Mechanics
  • Modulus Of Elasticity
  • Plastic Properties
  • Regions
  • Residual Stress
  • Tensile Strength
  • Texture
  • Yield Strength

Readers

  • Combustion and Flow Dynamics.
  • Reinforced Composite Materials
  • Structural Health Monitoring of Composite Structures.