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Title: Injection repair of carbon fiber/bismaleimide composite panels with bisphenol E cyanate ester resin

Resin injection of bisphenol E cyanate ester, a low viscosity resin that cures into a high temperature thermoset polymer, is investigated as a reliable repair method to restore strength and stiffness in delaminated carbon fiber/bismaleimide composites used in aircraft panels. The influence of temperature on the viscosity of the uncured resin was measured to optimize the injection conditions for high resin infiltration into the delaminations. The repair efficiency of the resin was evaluated by varying the panel thickness and the method by which the delamination damage was created in the composite specimens. Ultrasonic scanning (C-scan), flash thermography images, and cross-section analysis of repaired panels revealed excellent resin infiltration into the damaged region. Evaluation of mechanical repair efficiency using both bending stiffness and in-plain compressive strength of the composite panels as the repair metrics showed values exceeding 100%.
 [1] ;  [2] ;  [3] ;  [4] ;  [1] ;  [1]
  1. Ames Laboratory
  2. Iowa State University
  3. Fleet Readiness Center East
  4. Naval Air Warfare Center Aircraft Division
Publication Date:
OSTI Identifier:
Report Number(s):
IS-J 8442
Journal ID: ISSN 0266-3538
DOE Contract Number:
Resource Type:
Journal Article
Resource Relation:
Journal Name: Composites Science and Technology; Journal Volume: 100
Research Org:
Ames Laboratory (AMES), Ames, IA (United States)
Sponsoring Org:
USDOE Office of Science (SC)
Country of Publication:
United States