CRYOGENIC STRETCH-FORMING OF SOLID PROPELLANT ROCKET CASES.

Abstract

Three subscale high strength vaessel preforms were fabricated and two of these were stretched. Very high stress levels were successfully achieved with the high strength cases during the cryogenic stretch-forming operation. This indicates that high room temperature strength may be anticipated after aging. The first two full-scale preforms were completed and stretched. Several problems were encountered. The basic problem which manifested itself during the stretch of the first preform consisted of severe buckling at the forward end of the case. A leak at the weld joint at the large diameter of the 'dog-bone' was attributed to the buckling. A second case was stretched to confirm the conclusion that the buckling was a cause for the weld cracking. A design analysis was performed which indicated that the compressive stresses at the forward end were high during the lower pressures of the stretchforming operation. (Author)

Document Details

Document Type
Technical Report
Publication Date
Aug 31, 1964
Accession Number
AD0606558

Entities

People

  • R. H. Alper

Tags

Communities of Interest

  • Weapons Technologies

DTIC Thesaurus Topics

  • Buckling
  • Diameters
  • Energetic Materials
  • Materials
  • Materials Processing
  • Propellants
  • Rocket Engine Cases
  • Rockets
  • Solid Propellants
  • Stretch Forming

Readers

  • Metallurgy
  • Structural Dynamics.