HISTORY OF OZONE CRACKING IN BUNA-S RUBBER WING II INTERNAL INSULATION - WEAPON SYSTEM 133A,

Abstract

In the normal assembly sequence of Rocket Motor M-57E1, Spiralloy cas wound upon a Buna-S rubber internal insulator. In October 1962, the internal insulators of several motors were found to contain surface cracks. Two inspec tion programs were initiated to examine each case and categorize the magnitude of cracking. About 46% of the cases examined were cracked to depths ranging to a maximum of 0.060 in. Analysis of these results showed that the cracks occurred in areas of residual rubber stress and were a form of deterioration caused by normal exposure of the insulator to the atmosphere over a period of time. Effects of ozone cracking were then evaluated. Case bond strength was determined in one series of tests. In another test series, erosion rates of ozone cracked specimens were compared to that of control samples in test firings of hundred-pound-charge motors. Results of these tests indicated that ozone cracking has no effect on case bond strength or erosion rate of the Buna-S rubber internal insulators. (Author)

Document Details

Document Type
Technical Report
Publication Date
Sep 01, 1963
Accession Number
AD0417676

Entities

People

  • G.h. Berhold

Tags

Communities of Interest

  • Weapons Technologies

DTIC Thesaurus Topics

  • Assembly
  • Atmospheres
  • Dielectrics
  • Insulation
  • Residuals
  • Rocket Engines
  • Rockets
  • Sequences
  • Weapon Systems

Readers

  • Materials Science (Mechanical Engineering).
  • Polymer Science and Engineering.
  • Rocket Propulsion.

Technology Areas

  • Microelectronics
  • Microelectronics - Graphene
  • Microelectronics - Microelectromechanical Systems