TESTING OF WET-LAYUP MATERIALS FOR OUT-OF-AUTOCLAVE REPAIRS TO F-18 COMPOSITES

Authors
  1. Ferguson, J.S.
  2. Russell, A.J.
Corporate Authors
Defence Research Establishment Pacific, Victoria BC (CAN)
Abstract
This technical memorandum describes testing conducted at DREP in support of the evaluation of out-of-autoclave repair materials for the Composite Repair Engineering Development Program (CREDP). The problems with out-of-autoclave repair methods which are used on aircraft are associated with a lack of pressure available as well as temperature limitations, which often result in poor matrix properties. The purpose of this test program was to assess candidate materials and processes for carrying out on-aircraft repairs. Three material systems were cured under two or three different cycles, and test specimens were subsequently tested at both room temperature (RT)/dry and 104C (220F)/wet conditions. The interlaminar shear strength was determined for the different materials using the Short Beam and Tensile shear methods. Results indicated that graphite cloth impregnated with 3501-6 epoxy resin, and consolidated using a double vacuum bag staging technique, possessed the highest shear strengths under all test conditions. However, even this material experienced a reduction in strength of approximately 40% under hot/wet conditions, while the other systems evaluated displayed hot/wet properties 70-80% lower than RT/dry.
Keywords
COMPOSITE STRUCTURES
Report Number
DREP-TM-94-02 — Technical Memorandum
Date of publication
01 Jan 1994
Number of Pages
37
DSTKIM No
94-02954
CANDIS No
142085
Format(s):
Hardcopy;Originator's fiche received by DSIS

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