【航宇大讲堂】Where Experiments Meet Computational Modelling: a Case Study for Soft Materials

作者:时间:2019-10-14浏览:383供图:审阅:来源:乐投Letou

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报告题目:Where experiments meet computational modelling: a case study for soft materials

报告人:Dr. Mokarram Hossain (Senior Lecturer in Swansea University, United Kingdom)

报告时间:20191021日上午10:00

报告所在:明故宫校区A9号楼402集会室

主办单位:航空学院、机械结构力学及控制国家重点实验室

报告内容简介:

In recent years, the research in the arena of artificial muscles and soft robotics gain tremendous momentum across all major disciplines of science ranging from material sciences to computational engineering. Traditional robots are made of rigid metallic materials. Hence such robotic interfaces do not actually mimic human body. Therefore, over the years, scientists have been pursuing to find suitable materials and actuation mechanisms that will be very compliant to human body [1]. Polymeric materials are soft, highly stretchable, biocompatible, biodegradable, cost effective, easy to fabricate. Thanks to such attributes of soft materials, recently, the so-called Electro-active polymers (EAPs), Magneto-active polymers (MAPs), and Shape-memory polymers (SMPs) have been gaining popularity within the smart materials community [2]. The core mechanism of EAPs/MAPs/SMPs is an electro-mechanical/magneto-mechanical/thermo-mechanical coupling behaviour where an electric/magnetic/heat energy converts into a mechanical energy thanks to stimulation by an electric/magnetic/thermal field [3]. In contrast to traditional piezoelectric materials of small strain actuation mechanisms, the excitation on EAPs/MAPs/SMPs by an external field results in a large deformation. It also results in a change in their material behaviour, e.g. the polarization response. In this talk, after a brief over on the state-of-the start of the soft robotics, thorough and detailed experimental characterziations of a classical polymer will be presented [4]. All data produced from thermo-electro-mechanically coupled tests show that the electric and temperature loadings have profound effects in the time-dependent behaviour of polymer. The data set from various tests can be used for the identi?cation of thermo-electro-viscoelastic parameters for a suitable computational model that can capture thermo-electro-mechanically coupled behaviours of VHB. Furthermore, variational formulations of relevant governing equations are performed to implement these within Finite Element (FEM) framework [5, 6].

References

[1] M. Cianchetti, C. Laschi, A.Menciassi, P. Dario (2018), Biomedical applications of soft robotics, Nature Reviews Materials, 3: 143-153

[2] W. Hu, G. Z. Lum, M. Mastrangeli, M. Sitti (2018), Small-scale soft-bodied robot with multimodal locomotion, Nature, 554: 81-85

[3] M. Hossain, D. K. Vu, P. Steinmann (2014), A comprehensive characterization of the electro-mechanically coupled properties of VHB 4910 polymer, Archive of Applied Mechanics, 85(4):523-537

[4] M. Hossain, D. K. Vu, P. Steinmann (2012), Experimental study and numerical modelling of VHB 4910 polymer, Computational Materials Science, 59: 65-74

[5] Z. Liao, M. Hossain, X. Yao, M. Mehnert, P. Steinmann (2019), On thermo-viscoelastic experimental characterization and numerical modelling of VHB polymer, International Journal of Non-Linear Mechanics, 118:103263

[6] M. Mehnert, M. Hossain, P. Steinmann (2019), Experimental and Numerical Investigations of the Electro-Viscoelastic Behavior of VHB 4905, European Journal of Mechanics/A: Solids, 77: 103797

报告人简介:

Dr. Mokarram Hossain, PhD, FHEA, Nationality: German

College of Engineering, Swansea University

SA1 8EN, Fabian Way, Swansea, United Kingdom

Email: mokarram.hossain@swansea.ac.uk, Tel:0044-7482959957

 

Academic Career

Since 2017  Senior Lecturer, Zienkiewicz Centre for Computational Engineering (ZCCE), Swansea University, United Kingdom

Since March 2017  Visiting Lecturer, Harbin Engineering University, Harbin, P. R. China

2015-2016 (Feb)  Lecturer,  Northumbria University, Newcastle, United Kingdom

 

Professional achievements

12/2016  HEA Fellow, UK Higher Education Academy

2018-2020  Mercator Fellow, German Research Foundation (DFG)

03/2018  Selected as a young research leader for the prestigious WelshCrucible

04/2014  Best Post-doctoral Paper Prize, UK Association of Computational Mechanics

 

Research Grants

01/2019  SURGE Research Grant, GBP 3,000

02/2019  Swansea-King Saud University Grant, GBP, 58,000

05/2018  KESS 2, European Union (EU) Social Fund, GBP 55,000

04/2018  Grenoble University (France)-Swansea University Strategic Fund, GBP 60,000

03/2018  Mercator Mobility Grant, German Research Foundation (DFG), GBP 8,000

03/2018  Santander Staff Mobility Grant, GBP 1,000

 

Invited Speaker

Dr Hossain has widely been invited to give talks and to present research outputs in various prestigious universities, e.g., University of Texas A & M (2018), USA; Hokkaido University, Japan (2019); RWTH Aachen University (2016), TU Kaiserslautern (2018), Germany; Tsinghua University (2017), Zhejiang University (2018), China; Cardiff University (2018), UK; Universidad de Chile  (2018), Chile; IIT Hyderabad, India. He was a semi-plenary speaker at the ACEX Conference in Amsterdam (2018) and in ICCMS 2017

 

PhD Supervision

Dr. Hossain is currently supervising two PhD students as the main supervisor and is remotely co-supervising another student in Germany.

 

Journal Publications

Dr Hossain published more than 30 scientific papers in top-ranking international journals and more than thirty peer-reviewed international conference papers Professional Body Member: He is an active member of International Association of Applied Mathematics and  Mechanics (GAMM), European Mechanics Society (EUROMECH) Teaching Experience: Applied Mechanics, Manufacturing Engineering, Finite Element Method.

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