Accession Number : ADA307125

Title :   An Autoradiographic Technique for Studying Crack Growth in Plastics Composite Materials.

Descriptive Note : Interim rept.,

Corporate Author : NAVAL ORDNANCE LAB WHITE OAK MD

Personal Author(s) : Kinna, Marlin A.

PDF Url : ADA307125

Report Date : 01 APR 1966

Pagination or Media Count : 35

Abstract : Preliminary work has been conducted on segments of NOL Rings to study crack propagation characteristics in fiber reinforced plastics composite materials. Samples were submitted to a variety of fatigue loading conditions. They were then immersed in a tritiated water-ethylene glycol solution and after suitable processing, autoradiograms were prepared for analysis. Radiation emanating from the solution retained by the samples indicated that minute cracks and fissures were present in all of the specimens and that the radiation intensity varied in direct proportion to the severity of the fatigue loading conditions When photomicroscopy was used to analyze similar specimens, cracks could be detected only for the most severe test conditions.

Descriptors :   *FIBER REINFORCED COMPOSITES, *CRACK PROPAGATION, *PLASTICS, *AUTORADIOGRAPHY, COMPOSITE MATERIALS, ADVERSE CONDITIONS, FATIGUE(MECHANICS), RINGS, FAILURE(MECHANICS), BACKGROUND RADIATION, RADIOACTIVE ISOTOPES, ETHYLENE GLYCOL, TRACER STUDIES, GLASS REINFORCED PLASTICS.

Subject Categories : Laminates and Composite Materials
      Plastics

Distribution Statement : APPROVED FOR PUBLIC RELEASE