Impact of Composites for Sustainability
Distinguished Research Seminar Series
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Date
10 Nov 2026
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Organiser
Department of Industrial and Systems Engineering, PolyU
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Time
15:00 - 16:30
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Venue
CD301
Speaker
Prof. John Dear FREng
Remarks
If you have enquiries regarding E-certificate after the seminar, please contact david.kuo@polyu.edu.hk.
Summary
Restoring the structural integrity of composite structures through repair, that have been impacted or damaged in some way, is attracting considerable interest from both industry and academia. To predict the response of patch-repaired composite laminates under low velocity impact, an elastic-plastic (E-P), three-dimensional (3-D) damage model, which accounts for both intralaminar and interlaminar damage, has been developed. Experimental data, extracted from drop-weight impact studies, performed on pristine and patch-repaired composites, are researched and compared with modelling predictions. The 3-D E-P damage model predicts the load versus time and the load versus displacement responses of the composite during the impact event. In particular, the modelling predicts the extent, shape and direction of any intralaminar damage and interlaminar delaminations, i.e. interlaminar cracking, as a function of the depth through the thickness of the impacted CFRP test specimen, as well as the extent of permanent indention caused by the impactor striking the composite plate. This is both for pristine and patch-repaired panels. Examples will be provided of the application of these modelling and related repair techniques to commercial aircraft structures and wind turbine blade structures.
Keynote Speaker
Prof. John Dear FREng
Professor
Department of Mechanical Engineering, Imperial College London, London
Professor John Dear FREng has been an academic for 38 years in the Department of Mechanical Engineering, at Imperial College London. Prior to joining Imperial in 1988, John was an SERC Research Fellow at the Cavendish Laboratory, Cambridge University where he did his first degree and PhD research with Professor John E. Field OBE FRS. John did his undergraduate and PhD study at St John's College, followed by the Hertha Ayrton Research Fellowship at Girton College, Cambridge. John has been successful in obtaining research grants from the UK and US Government (EPSRC, ONR, MRC & DTI/TSB), European Commission, UK and overseas companies. His research expertise is structural integrity of materials including manufacturing and micro-structural effects. He is Associate Editor of the International Journal of Lightweight Materials and Manufacture. He has published over 450 journal and conference papers; contributed to 18 books, supervising 69 PhDs and 22 RAs. Examples include: impact performance of aircraft and automotive components, blast performance of laminated glass facades and composite structures, creep life of materials in power-station plant, water distribution plant and high-strain rate properties of polymers and composites. John was elected in 2023 a Fellow of the Royal Academy of Engineering.
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