Damage resistance of carbon fibre reinforced epoxy laminates subjected to low velocity impact: Effects of laminate thickness and ply-stacking sequence |
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| Institution: | 1. State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body, Hunan University, Changsha City 410082, PR China;2. Centre for Advanced Materials Technology (CAMT), School of Aerospace, Mechanical and Mechatronic Engineering, The University of Sydney, NSW 2006, Australia;1. Cross–Border Faculty of Humanities, Economics and Engineering, “Dun?rea de Jos” University of Gala?i, Domneasc? 47, 800008 Galati, Romania;2. Department of Mechanical Engineering, Faculty of Engineering, “Dun?rea de Jos” University of Gala?i, Domneasc? 47, 800008 Galati, Romania;3. CMEMS-UMinho, University of Minho, Campus de Azurém, 4800-058 Guimarães, Portugal;1. School of Engineering, University of Liverpool, Liverpool L69 3GH, UK;2. Department of Aerospace Engineering, Khalifa University, Abu Dhabi, United Arab Emirates |
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| Abstract: | A major concern affecting the efficient use of composite laminates is the effect of low velocity impact damage on the structural integrity 1–3]. The aim of this study is to characterize and assess the effect of laminate thickness, ply-stacking sequence and scaling technique on the damage resistance of CFRP laminates subjected to low velocity impact. Drop-weight impact tests are carried out to determine impact response. Ultrasonic C-scanning and cross-sectional micrographs are examined to assess failure mechanisms of the different configurations.It is observed that damage resistance decreases as impact energy increases. In addition, thicker laminates show lower absorbed energy but, conversely, a more extensive delamination due to higher bending stiffness. Thinner laminates show higher failure depth. Furthermore, quasi-isotropic laminates show better performance in terms of damage resistance. Finally, the results obtained demonstrate that introducing ply clustering had a negative effect on the damage resistance and on the delamination area. |
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| Keywords: | Reinforced epoxy composites Impact damage resistance Stacking sequence Size-scale effects Ply clustering |
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