Fatigue Life and Fracture Analyses for the M185/M284 Breech Ring.

Abstract

Fracture mechanics and fatigue life analyses were performed for Ml85/M2S4 breech rings, with emphasis on ring Serial No. 1659, which failed during safe life testing after 109 pressure cycles. Mechanical and fracture properties from the breech rings were measured and used to perform yield-before-break fracture analysis. Scanning electron fractography was used to determine the size of defect present in ring Serial No. 1659 prior to laboratory testing and the types of cracking that occurred during laboratory testing. Mean fatigue life calculations were prepared for various sizes of defect and applied pressures, including the defect size measured from fractography. the pressure of the laboratory test, and the pressure of the rounds that are fired with this type of breech ring. (MM)

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Document Details

Document Type
Technical Report
Publication Date
Jan 01, 1995
Accession Number
ADA293655

Entities

People

  • A. A. Kapusta
  • E. Troiano
  • John H. Underwood

Organizations

  • United States Army Armament Research, Development and Engineering Center

Tags

Communities of Interest

  • Air Platforms
  • Weapons Technologies

DTIC Thesaurus Topics

  • Electron Microscopy
  • Electrons
  • Engineering
  • Equations
  • Fatigue Life
  • Fractography
  • Fracture (Mechanics)
  • Hardness
  • Information Security
  • Laboratory Tests
  • Materials
  • Mechanics
  • Military Research
  • Scanning
  • Security
  • Tensile Strength
  • Yield Strength

Readers

  • Marksmanship and Weaponry.
  • Structural Health Monitoring of Composite Structures.
  • Tribology (the study of the boundary interaction between sliding surfaces, lubrication, wear and friction).

Technology Areas

  • Microelectronics
  • Microelectronics - Microelectromechanical Systems