Accession Number : ADA303217

Title :   Design, Fabrication and Test of Graphite/Polyimide Composite Joints and Attachments - Summary.

Descriptive Note : Contractor rept.,

Corporate Author : BOEING AEROSPACE CO SEATTLE WA

Personal Author(s) : Cushman, J. B. ; McCleskey, S. F. ; Ward, S. H.

PDF Url : ADA303217

Report Date : JAN 1983

Pagination or Media Count : 93

Abstract : This report summarizes the design, analysis and testing performed to develop four types of graphite/polyimide (Gr/PI) bonded and bolted composite joints for lightly loaded control surfaces on advanced space transportation systems that operate at temperatures up to 561K (550 deg F). Material properties and 'Small Specimen' tests were conducted to establish design data and to evaluate specific design details. 'Static Discriminator' tests were conducted on preliminary designs to verify structural adequacy. Scaled-up specimens of the final joint designs, representative of production size requirements, were subjected to a series of static and fatigue tests to evaluate joint strength. Effects of environmental conditioning were determined by testing aged (125 hours 589K (600 deg F)) and thermal cycled (116K to 589K (-250 deg F to 600 deg F), 125 times) specimens. It is concluded Gr/PI joints can be designed and fabricated to carry the specified loads. Test results also indicate a possible resin loss or degradation of laminates after exposure to 589K (600 deg F) for 125 hours. jg p93

Descriptors :   *GRAPHITE, *JOINTS, *POLYIMIDE RESINS, TEST AND EVALUATION, REQUIREMENTS, PRODUCTION, DEGRADATION, SIZES(DIMENSIONS), POLYMERS, COMPOSITE MATERIALS, LAMINATES, FABRICATION, COMPOSITE STRUCTURES, STRENGTH(MECHANICS), BONDED JOINTS, SCALING FACTOR, LOSSES, DESIGN CRITERIA, SPACE TRANSPORTATION, STATIC TESTS, FATIGUE TESTS(MECHANICS), CONTROL SURFACES, DISCRIMINATORS, BOLTED JOINTS.

Subject Categories : Polymer Chemistry
      Laminates and Composite Materials
      Plastics
      Couplers, Fasteners, and Joints
      Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE