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ahmedettaf's picture

Transfer printing enabled soft composite films for tunable surface topography

Transfer printing, an emerging manufacturing technique for heterogeneous material integration, is combined with the unique mechanics of soft composite films to realize a responsive surface for tunable topography in this work. Soft composite films are fabricated by transfer printing thin silicon ribbons on elastomeric films in a staggered manner. The corrugation formation in soft composite films requires a well-organized spatial distribution of the silicon ribbons which is enabled by transfer printing processes developed here.

Wenbin Yu's picture

Micromechanics Simulation Challenge

cdmHUB has completed the level I micromechanics simulation challenge. Several micromechanics methods/tools including both commercially available tools such as  Altair MDS, ESI VPS, Digimat, SwiftComp and research codes such as MAC/GMC/HFGMC and FVDAM, are used to analyze six typical 2D/3D microstructures.

How to link gfortran with Abaqus6.14 ?

Choose a channel featured in the header of iMechanica: 

Dear Abaqus Experts:

 

I am new Subroutine user and I want to analyze plastic deformation behavior of micro component.

So, I have to link Abaqus,gfortran,and Microsoft Visual Studio.

I tried several methods by reference to the following link,but I have not yet been successful in them.

Antonino Favata's picture

Graphene and Carbon Nanotubes are self-stressed

In the attached paper we have shown that graphene and carbon nanotubes are in a self-stress state in their natural equilibrium state, that is, the state prior to the application of external loads. We have identified different sources of self-stresses and accurately evaluated them; we have shown that they are by no means negligible with respect to load-related nanostresses.

baijatnal's picture

how to simulate projectile motion using abaqus

Choose a channel featured in the header of iMechanica: 

I want to simulate a problem in which a ball placed over a spring plate or elastic plate is fired at an angle to travel maximum distance. Can anybody help me how to simulate this.I have the plates's height of 180mm and I need to find the angle and maximum distance of travel.
Suppose I have vertical Cantilever Plate(say 100mm height) with a ball in contact on the top and I apply a load of 100N to bend the two and release it from that bent position or angular position. I need to calculate the best angle of projection and maximum distance travelled. Can anybody help me now

ghanshyampal78's picture

Modeling of carbon nanotubes and carbon nanotube–polymer composites

Highlights

-    In polymer matrix nanocomposites (PNC), carbon nanotubes (CNT) physically bond with polymeric matrix at a level where the assumption of continuum level interactions is not applicable.

-    Modeling and prediction of mechanical response and failure behavior of CNTs and PNCs becomes a task involving up-scale modeling strategies with multiple spatial and temporal scales in hierarchical or concurrent manner.

Mesoscale Constitutive Modeling of Non-Crystallizing Filled Elastomer

We have just published a new paper, 1st in the series, that presents a computational model to understand the microstructural changes in the filled elastomers as a consequence of mechanical forces. A heterogeneous (or multiphase) constitutive model at the mesoscale explicitly considering filler particle aggregates, elastomeric matrix and their mechanical interaction through an approximate interface layer is presented. An innovative lego-set method is discussed for generation of random microstructures that can be used for simple stochastic analysis.

karelmatous's picture

Extreme Multiscale Modeling - 53.8 Billion finite elements

In our recent Extreme Mechanics Letter, we present a simulation consisting of 53.8 Billion finite elements with 28.1 Billion nonlinear equations that is solved on 393,216 computing cores (786,432 threads). The excellent parallel performance of the computational homogenization solver is demonstrated by a strong scaling test from 4,096 to 262,144 cores.

Davide Bigoni's picture

The injection of an elastic rod

What should be expected when an elastic rod is forced to slip inside a sliding sleeve and against an obstacle?

After buckling, configurational forces play a strong role, so that a force reversal is observed!

Enjoy the injection of an elastic rod at http://www.ing.unitn.it/~bigoni/injection.html

PhD Positions in Advanced Virtual Prototyping at the University of Manchester

I am currently recruiting new PhD students to join my research group at The School of Mechanical, Aerospace and Civil Engineering at the University of Manchester. The core focus of the group is advanced computing for engineering simulation. My research interests centre on extreme scale parallel computing, cloud computing and virtual reality simulation platforms, applied to scientific and engineering problems involving complex processes.

Dian Yang's picture

Phase-transforming and switchable metamaterials

Phase-transforming and switchable metamaterials

Dian Yang, Lihua Jin, Ramses V Martinez, Katia Bertoldi, George M Whitesides, Zhigang Suo

Dian Yang's picture

Buckling of Elastomeric Beams Enables Actuation of Soft Machines

Buckling of Elastomeric Beams Enables Actuation of Soft Machines

Dian Yang, Bobak Mosadegh, Alar Ainla, Benjamin Lee, Fatemeh Khashai, Zhigang Suo, Katia Bertoldi, George M Whitesides

Legato lab report 2016 now online! Happy new year!

Dear readers,

As usual, you can find here our best wishes from the Legato Team, including a summary of our activities in 2015 and some highlights to look forward to in 2016: 2016 Lab Report:

http://orbilu.uni.lu/bitstream/10993/23314/3/2016_Legato_News.pdf

Permalink: http://orbilu.uni.lu/handle/10993/23314

Happy new year!

Stéphane Bordas

Osama R. Bilal's picture

First Reminder: Extreme Mechanics Letters – Special Issue on ‘Frontiers of mechanical metamaterials’

This themed issue on mechanical metamaterials invites contributions from different perspectives with the aim of highlighting the latest advances in the field.

The themed issue will focus on mechanical metamaterials in the general sense. This includes acoustic and elastic metamaterials as well as other types of metamaterials with unique mechanical and/or thermal properties at any length scale.

Topics of interest include the following:

Abaqus standard - surface-to-surface contact problems

Hello everybody
I am trying to run a model with a surface-to-surface interaction (Abaqus - standard 6.12). The interaction is between soil and aluminium piles. I faced an error and I have not been able to solve it yet. I would appreciate it if anybody could help me solve it please. The error is: 

The Master SN curve approach – A hybrid multi-scale fatigue simulation of short fiber reinforced composites

Atul Jain, Jose M. Veas, Stefan Straesser, Wim Van Paepegem, Ignaas Verpoest, Stepan Lomov

To appear in a special issue of journal Composites Part A

How to set elastic constants for sapphire?

Sapphire is an anisotropic crystal .  

How to set elastic constants in abaqus ?

How to get the shear stress on some special plane ?

 

 

Xuanhe Zhao's picture

Second Reminder: EML Special Issue on 3D Assembly by Cutting, Bending and Folding

Special Issue on 3D Assembly by Cutting, Bending and Folding in Extreme Mechanics Letters

When patterned with different materials, gradients or cut-outs, thin structures such as sheets and rods can bend or fold either spontaneously or by actuation in response to a force or stimulus to form a pre-designed three dimensional structure. This special issue addresses the design and mechanics of these structures with a special emphasis on programmability and non-linearity.  

Manuscript Submission:

N. Sukumar's picture

Perspective article on the X-FEM in computational fracture

Abstract: In this paper, we provide a retrospective examination of the developments and applications of the extended finite element method (X-FEM) in computational fracture mechanics. Our main attention is placed on the modeling of cracks (strong discontinuities) for quasistatic crack growth simulations in isotropic linear elastic continua.

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