The mechanical properties of vinylester resin matrix composites reinforced with alkali-treated jute fibres |
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| Affiliation: | 1. Department of Material Science, Indian Association for the Cultivation of Science, 2 A and B Raja S.C. Mallick Road, Jadavpur, Calcutta, India;2. Indian Jute Industries Research Association, 17 Taratola Road, Calcutta 700088, India;3. Central Glass and Ceramic Research Institute, 196 Raja S.C. Mallick Road, Calcutta, India;1. Department of Mechanical Engineering, V V College of Engineering, Tisaiyanvilai, 627657, Tamilnadu, India;2. Department of Mechanical Engineering, St. Xavier’s Catholic College of Engineering, Nagercoil, 629003, Tamilnadu, India;3. Micromachining Research Centre, Department of Mechanical Engineering, Sree Vidyanikethan Engineering College (Autonomous), Tirupati, 517102, Andhra Pradesh, India;1. Universidad Politécnica de Madrid, Structural Materials Research Centre (CIME), 28040 Madrid, Spain;2. Adhesion and Adhesives Laboratory, University of Alicante, 03080 Alicante, Spain;1. Department of Mechanical Engineering, Ramaiah Institute of Technology, Bangalore, Visvesvaraya Technological University, Belagavi, India;2. Department of Mechanical Engineering, Malnad College of Engineering, Hassan, Visvesvaraya Technological University, Belagavi, India;3. Department of Biocomposite Technology, Institute of Tropical Forestry and Forest Products, Universiti Putra Malaysia, UPM Serdang, Selangor, Malaysia;4. Department of Mechanical Engineering, Kamaraj College of Engineering and Technology, Virudhunagar, Tamilnadu, India |
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| Abstract: | Jute fibres were subjected to alkali treatment with 5% NaOH solution for 0, 2, 4, 6 and 8 h at 30°C. The modulus of the jute fibres improved by 12, 68 and 79% after 4, 6 and 8 h of treatment, respectively. The tenacity of the fibres improved by 46% after 6 and 8 h treatment and the % breaking strain was reduced by 23% after 8 h treatment. For 35% composites with 4 h-treated fibres, the flexural strength improved from 199.1 to 238.9 MPa by 20%, modulus improved from 11.89 to 14.69 GPa by 23% and laminar shear strength increased from 0.238 to 0.283 MPa by 19%. On plotting different values of slopes obtained from the rates of improvement of flexural strength and modulus, against NaOH treatment time, two different failure modes were apparent before and after 4 h of NaOH treatment. In the first region between 0 and 4 h, fibre pull out was predominant whereas in the second region between 6 and 8 h, transverse fracture occurred with minimum fibre pull out. This observation was well supported by the SEM investigations of the fracture surfaces. |
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