MANUFACTURING RESEARCH INVESTIGATION - NON DESTRUCTIVE TESTING, INSPECTION - PYROLYTIC GRAPHITE

Abstract

This investigation objectively extends certain non-destructive test methods to include pyrolytic graphite as one of the newer materials that can be readily examined by these methods. Each of the methods used is described and basic concepts relatedto the apparatus and technique involved are reviewed. Conclusions are as follows: (1) penetrant inspection is a rapid method of deter mining connected surface structure discontinui ties; (2) the sonic method is not a reliable technique for locating internal flaws; (3) ultra sonic examination is the optimum method for determination of internal discontinuities; (4) radiography is the optimum method for nodule characteristics and micro-structure determina tion; (5) the X-ray diffraction method is the optimum method for internal stress evaluations; (6) the Eddy-Current method is the optimum for determination of parallelism of layer planes; and (7) thermal gradient methods, for use on pyrolytic graphite examinations, are not yet sufficiently developed. Results appear encouraging.

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Document Details

Document Type
Technical Report
Publication Date
Jun 06, 1962
Accession Number
AD0408733

Entities

People

  • L. S. Mccollum

Organizations

  • Lockheed Martin Missiles and Space

Tags

Communities of Interest

  • Air Platforms
  • Weapons Technologies

DTIC Thesaurus Topics

  • Accuracy
  • Aerospace Industry
  • Cameras
  • Crystal Lattices
  • Destructive Tests
  • Detection
  • Electrical Conductivity
  • Equations
  • Manufacturing
  • Mass Production
  • Measurement
  • Mechanics
  • Production Engineering
  • Test And Evaluation
  • Test Methods
  • X Rays
  • X-Ray Diffraction

Readers

  • Reinforced Composite Materials
  • Structural Health Monitoring of Composite Structures.
  • Systems Analysis and Design