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Analysis of adhesively bonded CFRE composite scarf joints modified with MWCNTs |
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| Affiliation: | 1. Active Material Structures & Systems Lab., Department of Applied Mechanics, Indian Institute of Technology – Madras, India;2. Smart Material Characterization Lab., Department of Applied Mechanics, Indian Institute of Technology – Madras, India;1. Joining Technology Group, Singapore Institute of Manufacturing Technology, 2 Fusionopolis Way, 138634, Singapore;2. Polymer Composite Department, Institute of Materials Research and Engineering, 2 Fusionopolis Way, 138634, Singapore;1. Department of Industrial Engineering – DIIN, University of Salerno, Via Giovanni Paolo II, 132, 84084 Fisciano, SA, Italy;2. University of Dayton, 300 College Park Dayton, OH 45440, USA |
| Abstract: | The main objective of the present work is to improve the performance of bonded joints in carbon fiber composite structures through introducing Multi-Walled Carbon Nanotubes (MWCNTs) into Epocast 50-A1/946 epoxy, which was primarily developed for joining and repairing of composite aircraft structures. Results from tension characterizations of structural adhesive joints (SAJs) with different scarf angles (5–45°) showed improvement up to 40% compared to neat epoxy (NE)–SAJs. Special attention was considered to investigate the performance of SAJs with 5° scarf angle under different environments. The tensile strength and stiffness of both NE-SAJs and MWCNT/E-SAJs were dramatically decreased at elevated temperature. Water absorption showed a marginal drop of about 2.0% in the tensile strength of the moist SAJs compared to the dry one. Cracks initiation and propagation were detected effectively using instrumented-SAJs with eight strain gauges. The experimental results agree well with the predicted using three-dimensional finite element analysis model. |
| Keywords: | A Polymer-matrix composites (PMCs) B Environmental degradation C Finite element analysis (FEA) E Joints/joining |
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