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Epocast 50-A1/946 epoxy was primarily developed for joining and repairing of composite aircraft structural components. The Epocast epoxy was modified by ultrasonic dispersion of Multi-Walled Carbon Nanotubes (MWCNTs) with different weight percentages. Neat epoxy (NE) and the optimum MWCNT weight percentage are used to fabricate structural adhesive joints (SAJs) with different scarf angles (5, 10, 15, 30, and 45) in carbon fiber reinforced epoxy (CFRE) composite adherends. SAJs with different scarf angles were instrumented by eight strain gauges to measure the adherend tip strains and bond line strains during tension tests. The effect of water absorption on the tensile properties of the SAJs with 5 and 10 scarf angles was investigated experimentally. Because the SAJs with 5 scarf angle have the highest tensile properties, special attention was considered to investigate their performance under elevated temperature (50, 75 and 100C) and fatigue loads. The tensile properties of the MWCNT/E-SAJs showed significant improvements compared to the neat epoxy-SAJs. Crack initiation and propagation were detected effectively using the instrumented-SAJs. The effect of water absorption has marginal effect on the tensile strengths of the SAJs. On the other hand, the tensile strengths and stiffness are dramatically decreased at elevated temperature. MWCNTs have insignificant effect on the fatigue lives of the SAJs.

DEVELOPMENT OF CFRE COMPOSITE JOINTS USING MWCNT/E ADHESIVES