时间： 2017-05-12 来源： 信息员
应机械结构强度与振动国家重点实验室周进雄教授邀请，波士顿大学Harold S. Park教授来访我院并作学术报告。
报告人： Harold S. Park 教授
报告题目： Computational Modelling of Electromechanical Instabilities in Dielectric Elastomers
Harold Park is a Professor of Mechanical Engineering at Boston University. He received his BS, MS and PhD in Mechanical Engineering from Northwestern University in 1999, 2001 and 2004, respectively. He was a postdoctoral researcher at Sandia Labs (California) from 2004-2005. He held tenure-track positions at Vanderbilt University (2005-2007) and the University of Colorado (2007-2009) before moving to Boston University in 2010. His research has generally focused on the mechanics of nanostructures, coupled physics phenomena at nano and continuum length scales, and the mechanics of soft, active materials.
Dielectric elastomers are a class of soft, active materials that have recently gained significant interest due to the fact that they can be electrostatically actuated into undergoing extremely large deformations. An ongoing challenge has been the development of robust and accurate computational models for dielectric elastomers, particularly those that can capture electromechanical instabilities that limit the performance of dielectric elastomers.
I discuss in this work a recently developed finite element model for elastomers that is dynamic, nonlinear, and fully electromechanically coupled. The model also significantly alleviates volumetric locking due that arises due to the incompressible nature of the elastomers, and incorporates both viscoelasticity and surface tension effects within a finite deformation framework. The numerical examples will not only emphasize the effects of viscoelasticity and surface tension on electromechanical instabilities (creating, cratering, wrinkling) that have been observed experimentally, but will also demonstrate computational predictions for new instability mechanisms that have not yet been experimentally observed.