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

Submitted by Li Han on
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

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.

Free Size-limited Version of ADINA!

Submitted by ADINA Support on

We are offering a free size-limited version of the ADINA finite element analysis software widely used for solving linear and nonlinear structural, heat transfer, CFD and multiphysics problems.

To request your free copy please visit:

http://www.adina.com/n900.shtml

Light Activated Polymers

Submitted by H Jerry Qi on

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

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:

Postdoctoral Researcher Position in Computational Material Science

Submitted by guofengwang on

A postdoctoral research position in developing first-principles based multiscale modeling of Li ion batteries is available immediately at the Richard G. Lugar Center for Renewable Energy in Indiana University-Purdue University Indianapolis (IUPUI). The candidate will work on a project on developing and applying multiscale simulation approach to modeling the material processes occurring in Li-ion rechargeable batteries. This project involves close collaborations with the experimentalist scientists.

Failure Criteria for Fiber Analysis

Submitted by ash74u on

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

how can i model a Composite of 3 layup? ABAQUS

Submitted by booklee on

hi``eveybody.

I am new to ABAQUS,have a model to simulation.

it has 3 plies that are combined with glue.

the core ist polymer and the upper,lower ply is the same steel.

the 3 plies have eigenvalue of thichness

should i build 3 parts,or only 1 part in the parts model?



when i cannot ignore the glue,thus what should i do?

should i use Create Composite layup in the Property model or create a solid Composite

 

 thanks.

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

Submitted by Ryan Mendez Cabrera on

 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.