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Compositional patterning in coherent and dislocated alloy nanocrystals

Submitted by vh on
research
Variations in the distribution of the alloy components can significantly influence the electronic properties
of self-organized alloy nanocrystals. Using a combination of finite element and quadratic programming
optimization methods, we have developed an efficient numerical technique to compute the equilibrium
composition profiles in coherent and dislocated nanocrystals. We show that the variations in composition
profiles arise due to the competition between chemical mixing effects and the relaxation of composition-
dependent mismatch strain as well as strain due to dislocations. We find that the composition profiles

Comparison of intrapore velocities measured and simulated in the highly macro-porous biscayne aquifer

Submitted by BoJing Zhu on
research
Hybrid lattice blotzmann method-LBM TECPLOT C

Using the data from 3D hybrid lattice boltzmann code under parallel environments, some interesting simulated results are obtained by using Tecplot.

Tips:

After download the attached files, please change files name from *.ppt to *.wmv, then they  can be display normally by media player  

Water diffusion and fracture behavior in nano-porous low-k dielectric film stacks

Submitted by Li Han on
research
fracture
porous
low-k dielectric
diffusion
Among various low-dielectric constant low-k materials under development, organosilicate glasses
OSGs containing nanometer-size pores are leading candidates for use as intrametal dielectrics in
future microelectronics technologies. In this paper, we investigate the direct impact of water
diffusion on the fracture behavior of film stacks that contain porous OSG coatings. We demonstrate
that exposure of the film stacks to water causes significant degradation of the interfacial adhesion

Symmetry breaking, snap-through, and pull-in instabilities under dynamic loading of microelectromechanical shallow arches

Submitted by kaushik das on
research
MEMS
snap-through instability
symmetry breaking
pull-in parameters
bi-stability
pseudo-arc-length continuation

Arch-shaped microelectromechanical systems (MEMS) have been used as mechanical memories, micro-relays, micro-valves, optical switches, and digital micro-mirrors. A bi-stable structure, such as an arch, is characterized by a multivalued load deflection curve. Here we study the symmetry breaking, the snap-through instability, and the pull-in instability of a bi-stable arch shaped MEMS under static and dynamic electric loads.<!--break-->   Unlike a mechanical load, the electric load is a nonlinear function of the a priori unknown deformed shape of the arch.

Light Activated Polymers

Submitted by H Jerry Qi on
research

Soft active materials have received increasing interests recently. Here, soft materials can broadly refer to polymers, elastomers, hydrogel gels. Active materials mean that these materials can respond to external stimuli. Examples of soft active materials include shape memory polymers, environmentally responsive hydrogels, liquid crystal elastomers, etc.

Effect of constraint on swelling of hydrogels and formation of surface creases

Submitted by Rui Huang on
research
R. Huang Group Research
hydrogel
surface instability

Inspired by recent works by Wei Hong , Xuanhe Zhao, Zhigang Suo, and their coworkers, we started a project on hydrogels, with particular interest in various instability patterns observed in experiments. The attachment is our first manuscript on this subject. Through this work we hope to achieve the following:

Failure Criteria for Fiber Analysis

Submitted by ash74u on
research
fabric model

Hello,

I am trying to include a failure criteria for a single yarn in a plain- weave fabric model.The yarns behave as elastic-brittle( That is there is no plastic deformation)

I have the failure stresses and strains data in both fiber and transverse directions.I have  included the following properties:

Material definition

Density

Elastic : engineering constants

Viscoelastic: Relaxation test data

Analysis of Torsion-Bending of Laminated Composite Beam by FEM using ANSYS

Submitted by Ryan Mendez Cabrera on
research

 Hi everyone!

i'm a researcher at the Deparment of Mechanical Engineering of University of the Philippines-Diliman. currently, i'm working on completing my thesis for my MS degree. my research area in general is in mechanics of composite materials (fiber-reinforced). my problem is that of formulating the FEM solution to the torsion-bending of laminated composite beam having orthotropic layers.

Deformation gradients and atomistic simulations

Submitted by Biswajit Banerjee on
research
Plasticity

I came upon a recent paper called "Deformation gradients for continuum mechanical analysis of atomistic simulations" by Jonathan A. Zimmerman , Douglas J. Bammann,  and Huajian Gao, International Journal of Solids and Structures 46 (2009) 238–253 where the authors conclude with

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