DEVELOPMENT OF CFRE COMPOSITE JOINTS USING MWCNT/E ADHESIVES | ||
| The International Conference on Applied Mechanics and Mechanical Engineering | ||
| Article 26, Volume 16, 16th International Conference on Applied Mechanics and Mechanical Engineering., May 2014, Pages 1-22 PDF (1.63 M) | ||
| Document Type: Original Article | ||
| DOI: 10.21608/amme.2014.35557 | ||
| Authors | ||
| U. A. Khashaba1, 2; A. A. Aljinaidi3; M. A. Hamed3 | ||
| 1Professors, Dept. of Mechanical Engineering, Faculty of Engineering, King Abdulaziz University, P.O. Box 80204, Jeddah 21589, Saudi Arabia.+ | ||
| 2On Leave from: Mechanical Design and Production Engineering Department, Faculty of Engineering, Zagazig University, P.O. Box 44519, Zagazig, Egypt. Corresponding author: Tel.: +966553507515; Fax: +96626952181. | ||
| 3Professors, Dept. of Mechanical Engineering, Faculty of Engineering, King Abdulaziz University, P.O. Box 80204, Jeddah 21589, Saudi Arabia. | ||
| Abstract | ||
| ABSTRACT 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 (5o, 10o, 15o, 30o, and 45o) 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 5o and 10o scarf angles was investigated experimentally. Because the SAJs with 5o scarf angle have the highest tensile properties, special attention was considered to investigate their performance under elevated temperature (50, 75 and 100oC) 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. | ||
| Keywords | ||
| Multi-Walled Carbon Nanotubes; Tension tests; Iosipescu in-plane shear tests; Structural adhesive joints; Carbon fiber composites; Scarf angles; Water Absorption; Elevated temperature; Fatigue | ||
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