The Effect of Two Strength Reducing Techniques on the Ultimate Tensile Strength of AISI 4130 Steel: Rocket Motor Case Venting.

Abstract

This work is part of a continuing program to find an economical, but safe and reliable, way to vent rocket motors subjected to an external fire. In this study, the effect on the ultimate strength of rocket motor case material of two methods of strength reduction was investigated. The venting of the rocket motor cases makes use of a preferential insulation technique in conjunction with a strength reduction method. One method changes the morphology of the motor case by use of an electron beam weld. Venting using this method is accomplished by preferentially insulating around the weld on the outside of the case but not over the welded area. When subjected to an external fire, large thermal stresses would be induced and would break out the welded area. The second method makes use of a series of patterned microholes drilled into the motor case using a laser beam. Insulation is applied around the outside of the microhole pattern. Again, if subjected to an external fire, large thermal stresses should cause the microhole pattern to crack and break out.

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Document Details

Document Type
Technical Report
Publication Date
Jun 01, 1984
Accession Number
ADA145526

Entities

People

  • M. S. Wright
  • R. F. Kubin

Organizations

  • Naval Air Weapons Station China Lake

Tags

DTIC Thesaurus Topics

  • Classification
  • Electron Beams
  • Heat Energy
  • Materials
  • Materials Engineering
  • Measurement
  • Mechanical Properties
  • Melting
  • Pressure Vessels
  • Propulsion Systems
  • Rocket Engines
  • Security
  • Standards
  • Tensile Strength
  • Thermal Stresses
  • War Colleges
  • Weapons

Readers

  • Materials Science and Engineering.
  • Systems Analysis and Design
  • ballistics.

Technology Areas

  • Directed Energy
  • Microelectronics
  • Microelectronics - Graphene
  • Microelectronics - Microelectromechanical Systems