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Full-Text Articles in Engineering Science and Materials

A Collocated C0 Finite Element Method: Reduced Quadrature Perspective, Cost Comparison With Standard Finite Elements, And Explicit Structural Dynamics, Dominik Schillinger, John A. Evans, Felix Frischmann, René R. Hiemstra, Ming-Chen Hsu, Thomas J.R. Hughes Apr 2015

A Collocated C0 Finite Element Method: Reduced Quadrature Perspective, Cost Comparison With Standard Finite Elements, And Explicit Structural Dynamics, Dominik Schillinger, John A. Evans, Felix Frischmann, René R. Hiemstra, Ming-Chen Hsu, Thomas J.R. Hughes

Mechanical Engineering Publications

We demonstrate the potential of collocation methods for efficient higher-order analysis on standard nodal finite element meshes. We focus on a collocation method that is variationally consistent and geometrically flexible, converges optimally, embraces concepts of reduced quadrature, and leads to symmetric stiffness and diagonal consistent mass matrices. At the same time, it minimizes the evaluation cost per quadrature point, thus reducing formation and assembly effort significantly with respect to standard Galerkin finite element methods. We provide a detailed review of all components of the technology in the context of elastodynamics, that is, weighted residual formulation, nodal basis functions on Gauss ...


Ionic Electroactive Polymer Actuators As Active Microfluidic Mixers, Catherine Meis, Reza Montazami, Nicole Nastaran Hashemi Jan 2015

Ionic Electroactive Polymer Actuators As Active Microfluidic Mixers, Catherine Meis, Reza Montazami, Nicole Nastaran Hashemi

Mechanical Engineering Publications

On-chip sample processing is integral to the continued development of lab-on-a-chip devices for various applications. An active microfluidic mixer prototype is proposed using ionic electroactive polymer actuators (IEAPAs) as artificial cilia. A proof-of-concept experiment was performed in which the actuators were shown to produce localized flow pattern disruptions in the laminar flow regime. Suggestions for further engineering and optimization of a scaled-down, complete device are provided. While the device in its current state of development necessitates further engineering, the use of IEAPAs addresses issues currently associated with the use of electromechanical actuators as active microfluidic mixers and may prove to ...