关于举办英国Swansea大学Mokarram Hossain博士学术讲座的通知
发布时间: 2017-11-08

题 目:Recent trends in electro-mechanically coupled modelling of electro-active polymers
时 间:11月10日(周五)15:00-16:00
地 点:交通大楼604室
报告人:英国Swansea大学Mokarram Hossain博士

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                               土木与交通学院

                               2017年11月8日

报告人简介:
   Mokarram Hossain博士现任英国Swansea大学Zienkiewicz工程计算中心高级讲师。他于2010年获德国Erlangen-Nuremberg博士学位,后曾在英国Northumbria大学等高校担任博士后研究员、讲师等职务。Mokarram Hossain博士的研究领域包括电-磁活性聚合物力学性能研究、复合材料力学、数值计算等。他已在Computational Mechanics, International Journal of Solids and Structures, Proceedings of the Royal Society A等国际期刊发表学术论文和国际会议论文40余篇,被引400余次,h-index为10.

报告摘要:
   In the last couple of years, the so-called electro-active polymers (EAPs) have been gaining popularity within the smart materials community. The core mechanism of EAPs is an electromechanical coupling behaviour where an electric energy converts into a mechanical energy thanks to stimulation by an electric field. In contrast to traditional piezoelectric materials of small strain actuation mechanisms, the excitation on EAPs by an external electric field results in a large deformation. It also results in a change in their material behaviour, e.g. the polarization response. To enhance actuation behaviour, particle-filled EAPs become promising candidates nowadays. Recent studies suggest that particle-filled EAPs, which can be cured under an electric field during the manufacturing time, do not necessarily form perfect anisotropic composites, rather they create composites with dispersed chains. Hence in this contribution, an electro-mechanically coupled constitutive model is devised that considers the chain dispersion with a probability distribution function (PDF) in an integral form. To obtain relevant quantities in discrete form, numerical integration over the unit sphere is utilised. Necessary constitutive equations are derived exploiting the basic laws of thermodynamics that result in a thermodynamically consistent formulation. To demonstrate the performance of the proposed electro-mechanically coupled framework, we analytically solve a non-homogeneous boundary value problem, the extension and inflation of an axisymmetric cylindrical tube under electromechanically coupled load. The results capture various electro-mechanical couplings with the formulation proposed for EAP composites.