Induced Overload Residual Stresses in EX35 Multi-Lug Breech Ring.

Abstract

An exploratory prototype multi-lug breech block/ring assembly was designed for future projectile launchers. The new geometry redistributes the applied load to several surfaces rather than one surface in conventional breech to react the load. Induced residual stresses from shot peening and overload processes improve fatigue life of the system. In this work, experimental x-ray diffraction residual stress mapping was performed in the lugs of the unaffected portion of a 50 percent overloaded multi-lug breech ring that was fatigue tested to failure. Finite element modelling of a two-dimensional cross section of the breech block/ring assembly was performed using ABAQUS codes on a Convex C-220 computer. Comparisons of experimental residual stresses and finite element analysis (FEA) predictions showed good agreement in the major features of residual stress distribution. especially in the front lug. While FEA predicted the general characteristics of experimental residual stress distribution, experimental residual stresses were deeper and less compressive. (MM)

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Document Details

Document Type
Technical Report
Publication Date
Aug 01, 1995
Accession Number
ADA303482

Entities

People

  • A. Gabriele
  • M. J. Glennon
  • S. L. Lee

Organizations

  • United States Army Armament Research, Development and Engineering Center

Tags

Communities of Interest

  • Air Platforms
  • Weapons Technologies

DTIC Thesaurus Topics

  • Agreements
  • Assembly
  • Breech Mechanisms
  • Diffraction
  • Fatigue Life
  • Finite Element Analysis
  • Geometry
  • Materials
  • Measurement
  • Mechanical Working
  • Mechanics
  • Military Research
  • Shot Peening
  • Stresses
  • Two Dimensional
  • X Rays
  • X-Ray Diffraction

Readers

  • Structural Dynamics.
  • Structural Health Monitoring of Composite Structures.
  • ballistics.