Prof. Ken-ichi Manabe,
Tokyo Metropolitan University, Japan
Bigoraphy:Ken-ichi Manabe was awarded his PhD in mechanical engineering in April 1985 from the Tokyo Metropolitan University (TMU), Japan. He had been a Professor at the TMU since 2002. After he retired from TMU in 2017, he received the title of Emeritus Professor from TMU. Prof. Manabe has undertaken extensive research on the theory and modelling of tube/sheet metal forming processes and intellectualization of their forming processes for over 40 years. Recently his research interest extends toward microforming technology and deformation mechanics in micro/meso scale. He was gained academic recognition in the Japan Society for Technology of Plasticity (JSTP), the Japan Society of Mechanical Engineers (JSME) and so on. He contributes to promote dissemination of tube forming technology and its theory and modeling. He received the Best Paper Award in 1989, 2009 and 2012 from the JSTP. He received the JSTP Medal in 2010 and attained the grade of Fellow in 2009 from the JSTP. He was the Vice President of the JSTP in 2011-2012, and the President of the JSTP in 2015-2016. He has published 19 book chapters, over 200 refereed journal papers and over 200 refereed conference papers.
Speech Title: Numerical analysis and modelling of thermoforming for woven fabric green composites
Abstract: Development and utilization of green composites and green plastics are focused on to establish a sustainable society as measures of global warming carbon dioxide emissions reduction and marine plastic problems. Recently, much more attention on research and development on green composites and green plastics are being paid. In this presentation, the thermoforming characteristics and deformation behavior in thermoforming of green composite materials are focused on and deformation behavior of simple tension, deep drawing and bending processes are explained from my previous studies. A matrix/yarn sliding friction model is adopted to simulate the deformation behavior of woven fabric green composite sheets for the thermoforming in this study. The model is assembled with actual configuration of the green composites with low volume fraction of yarns. A certain gap were introduced on the interface between yarn and matrix, wrap and weft yarns for considering slippage phenomenon of yarns observed in the actual deformation processing. The interaction is generated by the sliding friction contact surface. The deformation analysis was carried out using a commercial explicit dynamic FE code, LS-DYNA. To verify the model, simple tension test and deep drawing test were performed experimentally and compared with simulation results. As a result, the results of simulation model with a gap have good agreements with the experimental results. In the simple tension deformation. the obvious deformation behavior and a surface unevenness configuration on the composite were confirmed, and in the case of deep drawing, tension deformation behavior orientation of yarn and thickness of drawn cup agreed with experiment well. Moreover, for bending deformation, the deformation behavior of unidirectional reinforced laminated green composite is shown and the slippage effect of yarns on the bending deformation is confirmed.