英国诺丁汉大学陈帅博士于2019年12月23日带来题为“Simulation and Optimization of Automated Preforming Process for Complex Components "的学术交流会，欢迎各位老师、同学前往聆听、现场交流。

时间：2019年12月23日上午10点30分

地点：兴庆校区西二楼第三会议室

讲座人：陈帅 博士

Seminar Title: Simulation and Optimization of Automated Preforming Process for Complex Components

Abstract

This talk focuses on the development of a numerical material model to simulate the forming of fabric plies into complex 3D shapes. The material model has been used to evaluate the feasibility of using matched-tool forming (MTF) and double diaphragm forming (DDF), to manufacture low cost fabric preforms suitable for liquid moulding processes. The forming behaviour of woven fabrics and non-crimp fabrics (NCF) has been investigated to understand the deformation mechanisms and the cause of defects, in order to seek feasible solutions for defect reduction. A non-orthogonal constitutive relation has been developed to capture the nonlinear fabric behaviour, which was implemented in Abaqus/Explicit. The material model has been used to successfully identify the cause of forming-induced defects, and has been used to optimise preform geometry and process parameters to mitigate defects. An optimisation methodology has been developed for placing local inter-ply stitches on multi-ply preforms by coupling the FE analysis with a genetic algorithm. The stitches enable multiple plies to be joined together to aid robotic handling and the optimisation routine ensures that the placement of the stitches does not adversely affect the formability of the preform. Results indicate that whilst the inter-ply stitches affect the shear distribution at a global level, the formability of a multi-ply preform can be improved compared to the unstitched counterpart by optimising the pattern of through-thickness stitches.

Resume

Dr Shuai Chen is a Research Fellow in Composites Research Group, University of Nottingham. His current research focuses on design, analysis, and optimisation of composites forming process for Automotive & Aerospace sectors. He has specialised in the development of composites manufacturing processes and simulations, and is committed to supplying feasible solutions for high-quality and defect-free preforms by material/process optimisation based on finite element (FE) simulation. To date, he has completed 24 papers (H-index 6), and served as a Session Chair of “Process modelling” for 21st International Conference on Composite Materials in 2017. Dr Chen is a member of Society for the Advancement of Material and Process Engineering (SAMPE), and a member of the Institute of Materials, Minerals and Mining (IOM3). During the last five years, he has worked for 3 EPSRC projects and 4 Innovate UK projects, directly collaborated with 3 universities, 3 High Value Manufacturing catapults and 10 companies. Recently, he has been awarded two external grants to develop step-changing techniques for composites manufacturing. He is now co-supervising PhD students on “Advancements in Simulation Composites Manufacturing Technologies”, and acting as a peer reviewer for several top journals in composites research, such as Composites Science and Technology, Composites Part A: Applied Science and Manufacturing, Composite Structures, Thin-Walled Structures, etc.