NRL Engineering Materials and Chemistry Divisions Studies of the A2 Tube Failure.

Abstract

This report discusses the hypotehsis and supporting evidence concerning the probable major failure mode of A2 microwave tubes. Such failure occurrred due to loss of adequate vacuum. It was hypothesized that cracking due to tube wall (Al2O3)-metal electrode stresses could cause cracks to connect pores in the Al2O3 to the tube interior and thus vent gas in the pores left from processing into the tube. Calculations, microstructure, and fractographic evidence from this program are reported supporting this pore mechanism. Supporting pore-outgassing, stress cracking and acoustic emission evidence from other studies is also noted. Limited tensile test trials of the tubes are also reported. (Author)

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Document Details

Document Type
Technical Report
Publication Date
Jun 01, 1977
Accession Number
ADA043283

Entities

People

  • N. Lynn Jarvis
  • R. L. Jones
  • Roy W. Rice
  • Steve W. Freiman

Organizations

  • United States Naval Research Laboratory

Tags

Communities of Interest

  • Air Platforms
  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Acoustic Emissions
  • Adhesives
  • Barometric Pressure
  • Bonding
  • Chemistry
  • Crack Propagation
  • Cracks
  • Electron Microscopy
  • Engineering
  • Failure Mode And Effect Analysis
  • Joints
  • Materials
  • Scanning Electron Microscopy
  • Stresses
  • Surface Chemistry
  • Tensile Testing
  • Thermal Expansion

Readers

  • Materials Science (Mechanical Engineering).
  • Technical Research and Report Writing.
  • ballistics.