This seminar will provide an excellent platform for industry partners and academic experts to share insights on the latest advances in fibre reinforced composite areas leading to possible collaborations.
1.45pm Welcome Address by Dr Tay Bee Yen, Group Manager, Forming Technology Group
1.50pm Composites Activities at SIMTech by Dr Teo Wern Sze, Forming Technology Group
2.00pm The Toughness of Nano-Modified Epoxy Polymers and Fibre Composites by Prof. Anthony Kinloch, Imperial
College London, UK
3.30pm Advanced Computational Progressive Failure Analysis of Composites by Prof Tay Tong Earn, NUS
4.30pm Accelerating Design Innovation for Composites with 3D Technology by Mr Narayan Sreenivasan, Senior
Composites Solution Expert, Dassault Systèmes South Asia
The Toughness of Nano-Modified Epoxy Polymers and Fibre-Composites by Professor A.J. Kinloch, Imperial College London
The present seminar will first discuss the general area of composites materials based upon continuous fibres embedded in a polymeric matrix, and the adhesive bonding of such composite materials. Future applications and research areas will be emphasised. Secondly, some of the current research in the ‘Adhesion, Adhesives and Composites’ Group at Imperial College London on ‘The Toughness of Nano-Modified Epoxy Polymers and Fibre-Composites’ will be described. The effect of adding silica nanoparticles, and other types of nano-modifiers, to a cured epoxy polymer in bulk and when used as the matrix of carbon- and glass-fibre reinforced composites will be discussed. The formation of ‘hybrid’ epoxy polymers, containing both nano-modifiers and carboxyl-terminated butadiene-acrylonitrile (CTBN) rubber microparticles, is also discussed. The structure/property relationships are considered, with an emphasis on the toughness and the toughening mechanisms. The observed toughening mechanisms that were operative were: (a) plastic shear-yield bands, and (b) debonding of the matrix from the silica nanoparticles, followed by plastic void growth of the epoxy. The largest increases in toughness observed were from the formation of the ‘hybrid’ materials. These increases in the toughness of the bulk polymers were found to be successfully transferred to the fibre composites, where the fracture energy was increased further by a fibre-bridging toughening mechanism. The cyclic fatigue properties were also observed to be enhanced for both the nano-modified epoxy polymer and for the corresponding fibre-composites. The present work also extends an existing theoretical model to predict the toughening effect of the nanoparticles in a thermoset polymer. There was excellent agreement between the predictions and the experimental data for the epoxy polymer containing the silica nanoparticles, and with micrometre-sized glass particles. The latter, relatively large, glass particles were investigated to establish whether a ‘nano-effect’ with respect to increasing the toughness of the epoxy bulk polymers did indeed exist.
Advanced Computational Progressive Failure Analysis of Composites by Professor T E Tay, National University of Singapore
The progressive failure of fiber-reinforced composite structures is generally a series of complex processes involving multiple failure modes across various length scales. Strong interactions and couplings between the failure modes such as delamination, fiber-matrix debonding and matrix cracks mean that the path from initiation to ultimate failure of the composite part is usually a highly history-dependent one. While computational tools such as the finite element method are now routinely employed in the stress analysis of composite structures, their use in modelling and prediction of progressive failure should be approached with some caution. A wide array of computational methods such as cohesive elements, material stiffness degradation models, element failure methods, virtual crack closure, etc., may be employed to model the appropriate failure modes, but the results are often dependent on input parameters for the fracture and failure theories, the damage evolution laws and sometimes on modelling artifacts such as mesh design. Of particular interest is the fidelity of the computer simulation with regards to the ability to correctly capture evolving damage patterns and final failure loads. The large amount of information accumulated in a typical progressive failure analysis also presents challenges to computational resources and data management. The seminar will discuss the current strategies and computational tools for the analysis and prediction of progressive failure in composites. Some examples of analysis with computational models and methods that could minimise or eliminate mesh dependence and correctly predict size effects will be discussed.
Accelerating Design Innovation for Composites with 3D Technology by Mr Narayan Sreenivasan, Dassault Systèmes South Asia
(From aircraft fairing to train noses, boat hulls, and wind blades, composites offer dramatic opportunities to meet today’s increasingly cost-driven market requirements and environmental concerns.)
Ultra light, strong, highly resistant and durable, composites are ideal for producing lightweight structures with tremendous performance capabilities. Yet, designing and mass-producing complex production-ready composites parts is highly complex and expensive. Traditional Composites solutions cover the design, analysis, and manufacturing of Composites parts in a sequential, time-consuming, non-collaborative process burdened by heavily manual operations. Already in use at the major aircraft and helicopter manufacturers and suppliers, Formula 1 teams, as well as yacht designers and builders, Dassault Systèmes’ complete set of process-oriented solutions to design, simulate, and manufacture composite structures on a single virtual platform helps companies to:
- Keep composites development and build cost under control
- Reduce fabrication cycle time and shorten ramp-up time throughout the process, from initial design to manufacturing preparation and shop floor processing
- Manage the vast amount of data, large number of specifications, and the hundreds of plies generated, from design to manufacturing
- Predict global behavior in order not to over-design the part, undermine the initial lightweight properties, and incur additional cost
- Perform tedious, complex ply design while ensuring manufacturability by taking manufacturing constraints into account and generating the necessary output
- Communicate efficiently, promote concurrent engineering, and manage numerous interactions between composites engineering and manufacturing teams or cross-functional disciplines to prevent misunderstandings, errors, and delays.
Developed in partnership with industry leaders, DS end-to-end PLM solution for composites combines, on a single platform, the power of CATIA for virtual product definition, SIMULIA for virtual testing, DELMIA for virtual production, and advanced specialised solutions from a extensive network of highly qualified CAA partners, to support the expanded use of composites and address the advanced needs of the community to reduce the risks and costs associated to the development of composite structures. At the heart of the solution, CATIA provides a dedicated environment for the design of composite structures, including:
- Full definition from conceptual to engineering detailed design and manufacturing preparation
- Dedicated functional contexts to integrate structural, assembly, and manufacturing requirements early in the design phase
- Collaboration between cross-functional teams through powerful synchronization mechanisms
- Knowledge-based engineering
About the Speakers
Professor Tony Kinlochholds a personal chair as ‘Professor of Adhesion’ and is the ‘Head of Department’ of Mechanical Engineering at Imperial College London. He also leads the ‘Adhesion, Adhesives and Composites’ Research Group. He has published over two hundred patents and refereed papers in the areas of adhesion and adhesives, toughened polymers and the fracture of polymers and fibre-composites. He has also written and edited seven books in these areas. He has been awarded the ‘Armourer’s and Braziers Prize for Materials Science’ from The Royal Society, the Le Prix Dédale de la Sociéte Française d’Adhesion, the ‘Hawksley Gold Medal’ of the Institution of Mechanical Engineers, the ‘Griffith Medal and Prize’ and ‘Wake Medal’ of the Institute of Materials, the Adhesion Society of Japan Award for ‘Distinguished Contributions to the Development of Adhesion Science and Technology’ and the US Adhesion Society Award for ‘Outstanding Excellence in Adhesion Research’. He is a Fellow of the Royal Society of Chemistry, the Institute of Materials, the Institution of Mechanical Engineers and the City and Guilds Institute. In 1997 he was elected a Fellow of the Royal Academy of Engineering and in 2007 was elected to the Fellowship of The Royal Society.
Professor Tay Tong Earn is a Professor at the Department of Mechanical Engineering and the Vice-Dean for Research at the Faculty of Engineering at the National University of Singapore. He obtained his Bachelor of Engineering (First Class) and PhD in Solid Mechanics from the University of Melbourne, Australia. His research interests are in damage, fracture, impact and computational analysis of composite structures, and multiscale modelling and molecular mechanics of polymers and composites. He is the author or co-author of 70 international journal papers, more than 130 conference and seminar presentations, 2 patents and a book chapter. He serves on the editorial boards of the Journal of Composite Materials, International Journal of Damage Mechanics and Journal of Reinforced Plastics and Composites, and is a regular reviewer for various journals in the field of composites and mechanics. He is a member of the scientific advisory board of the International Conference on Composite Materials (ICCM), a series of premier biennial conferences. Prof Tay is also a registered professional engineer, and actively involved in projects with industry.
Mr Narayan Sreenivasan is currently Senior Consultant in the technical competency centre for India, ASEAN, Australia and New-Zealand Value Channel. His primary role is to ensure a successful collaboration of Dassault Systemes South Asia with their value added resellers to rapidly respond to customer needs. He leads specific solutions of Dassault Systemes such as CATIA Composites and Virtual product management –and its adaptation by industries such as Aerospace , Aircrafts & Wind energy. Narayan commenced his professional career as a CAD/CAM engineer with Centre for Civil Aircraft Design in India in 1999 and joined Dassault Systemes in January 2001 as an application engineer to support the 3D CAD & Virtual product management implementation in large Aerospace OEM in India. He led Knowledge based engineering, composites design virtual product management projects for Aircraft structure design and system integration, respectively. Mr Sreenivasan graduated in Mechanical Engineering.
Who Should Attend
R&D Managers, engineering and research staff from precision engineering industry; academic staff and research students.
Registration for the seminar is free of charge. Seats are available on a first-come, first-served basis. To reserve a seat, please register online.
Dr Teo Wern Sze, Email: wsteo@SIMTech.a-star.edu.sg
Ms Ng Feng Lin, Email: flng@SIMTech.a-star.edu.sg