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%.
Raman study of the Verwey transition in magnetite at high-pressure and low-temperature: Effect of Al doping J. Appl. Phys. 112, 043510 (2012) Visible luminescence from hydrogenated amorphous silicon modified by femtosecond laser radiation Appl. Phys. Lett. 101, 081902 (2012) In situ Raman spectroscopic study of the pressure induced structural changes in ammonia borane J. Chem. Phys. 137, 074506 (2012) Disorder-activated Raman spectra of cubic rocksalt-type Li(1−x)/2Ga(1−x)/2MxO (M=Mg, Zn) alloys
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