Dielectric constant and breakdown strength of polymer composites with high aspect ratio fillers studied by finite element models

2013 ◽  
Vol 76 ◽  
pp. 29-36 ◽  
Author(s):  
Zepu Wang ◽  
J. Keith Nelson ◽  
Henrik Hillborg ◽  
Su Zhao ◽  
Linda S. Schadler
Keyword(s):  
Dielectric Constant ◽  
Finite Element ◽  
Aspect Ratio ◽  
Polymer Composites ◽  
High Aspect Ratio ◽  
Breakdown Strength ◽  
Finite Element Models

The Analyse on Stiffness Model of 3-PPSR Flexible Parallel Robot

2014 ◽  
Vol 716-717 ◽  
pp. 1643-1647
Author(s):  
Yu Liang Luan ◽  
Wei Bin Rong ◽  
Li Ning Sun
Keyword(s):  
Finite Element ◽  
Aspect Ratio ◽  
High Aspect Ratio ◽  
Parallel Robot ◽  
Force Balance ◽  
Element Analysis ◽  
Flexible Hinge ◽  
Stiffness Model ◽  
The Finite Element Analysis ◽  
The Mathematical Model

In order to achieve greater workspace motion, it’s designed a high aspect ratio 3-PPSR flexible parallel robot, driven by a piezoelectric motor, connected by flexible hinges, which has the advantages of simple structure, non singular, seamless, high motion precision. Because of the stiffness of the system directly affecting the motion accuracy, load bearing performance, according to the characteristics of high aspect ratio flexible hinge, It’s established the mathematical model of flexible hinge through finite element method. Using method of integral stiffness, conbined coordination equation with force balance equation, the flexible stiffness model of system is obtained. Finally, through using Ansys, it’s confirmed the validity of the theoretical model by comparing of the theoretical stiffness model results with the finite element analysis of the model results, to provide a reliable guarantee for optimization and analysis of kinematics and dynamics of flexible parallel robot.

Aircraft Configuration Improvement Study from Aerodynamic and Structure Standpoints

2015 ◽  
Vol 798 ◽  
pp. 565-570
Author(s):  
Luciano Magno Fragola Barbosa ◽  
Ricardo Luiz Utsch de Freitas Pinto ◽  
Bernardo Oliveira Hargreaves
Keyword(s):  
Finite Element ◽  
Aspect Ratio ◽  
High Aspect Ratio ◽  
Load Distribution ◽  
Structural Deformation ◽  
Load Factor ◽  
Aircraft Wing ◽  
Induced Drag ◽  
Vertical Displacements ◽  
Lifting Line

In this work improvements on the geometry of a high aspect ratio aircraft wing are studied, in order to reduce the wing in-flight deformation, without changing the drag of the aircraft and without increasing the structural weight. For this, from a reference rectangular wing, one new wing with elliptical planform has been defined; and comparative analyses of loads and structural deformation have been made for the wings considered: the original rectangular wing and the new corresponding elliptical wing. The aerodynamic analysis is based on the lifting line approach. A computer routine is made by the authors based on this approach, to obtain both induced drag values and the load distribution of the two wings, the original one and the corresponding elliptical. Based on the loads, spars for the two wings have been defined, and in order to evaluate the vertical displacements in flight, a finite element routine have been used. The main result of this study is the comparison of the deformation of wings considered, subjected to the same load factor, and for the same aircraft mass. The results obtained are encouraging for further developments using the present methodology.

scholarly journals Finite element simulation of fracture in a restored premolar tooth using high aspect ratio elements

2018 ◽  
Vol 34 (1) ◽  
pp. 54-64 ◽  
Author(s):  
Maryam Ramezani ◽  
Estevam Barbosa de Las Casas ◽  
Cláudia Machado de Almeida Mattos ◽  
Osvaldo Luís Manzoli ◽  
Eduardo Alexandre Rodrigues
Keyword(s):  
Finite Element ◽  
Aspect Ratio ◽  
Finite Element Simulation ◽  
High Aspect Ratio ◽  
Element Simulation

Improving piezoelectric performance of lead-free polymer composites with high aspect ratio BaTiO3 nanowires

2016 ◽  
Vol 53 ◽  
pp. 143-148 ◽  
Author(s):  
Woongchul Choi ◽  
Kyungwho Choi ◽  
Gang Yang ◽  
Jae Chul Kim ◽  
Choongho Yu
Keyword(s):  
Aspect Ratio ◽  
Polymer Composites ◽  
High Aspect Ratio ◽  
Lead Free ◽  
Piezoelectric Performance

Fabrication of Dual-Damascene Structures in Low Dielectric Constant Polymers for Multilevel Interconnects

1996 ◽  
Vol 427 ◽  
Author(s):  
R. Tacito ◽  
C. Steinbrüchel
Keyword(s):  
Dielectric Constant ◽  
Aspect Ratio ◽  
Silicon Dioxide ◽  
High Aspect Ratio ◽  
Reactive Ion Etching ◽  
Low Dielectric Constant ◽  
Ion Etching ◽  
Fine Line ◽  
Dual Damascene ◽  
Low Dielectric

AbstractParylene-n (pa-n) and benzocyclobutene (BCB) are novel candidate materials for interlevel dielectrics in future multilevel interconnects, due to their dielectric constant being much lower than that of silicon dioxide. We describe the fine line patterning of these materials by reactive ion etching in O2/CF4 plasmas. Examples of high aspect ratio trenches and dual damascene structures are presented involving processes with single and double hardmasks.

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