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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

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:


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.

MNasr's picture

Thermo-coupled Surface Cauchy-Born Theory

Obtaining high accuracy with low computation requirements is a challenge in the modeling of the thermomechanical response of nanostructures. Although the field is important to capture size dependency at finite temperatures, it is mostly quasiharmonic and Molecular Dynamics (MD) simulations that lead to reliable results. To formulate an engineering approach to this problem, Thermo-coupled Surface Cauchy-Born method was developed combining Surface Cauchy-Born and Engineering Molecular Mechanics.

Wenbin Yu's picture

ICME Prize

The AIAA Materials Technical Committee (TC) with the support of Composite Design and Manufacturing HUB (cdmHUB), NASA (National Aeronautics and Space Administration) and Rolls-Royce Corporation funding have established an ICME prize for the best aerospace-focused ICME project.

Deformation Gradient from a deformed mesh - 4 node solid elements

Choose a channel featured in the header of iMechanica: 


I have a 2D mesh that has 4 node solid elements. I am aware that to determine the components of deformation gradient tensor F, I will require displacement functions, u(x,y) and v(x,y) in a current configuration. Taking a partial derivative with respect to x and y respectively yields components of def. gradient tensor F. 

Numerical simulation of cutting process with Abaqus

Hello ,

I'am student in post graduation , in production mechanical engineering option , i want help about numerical simulation of cutting process

with Abaqus , Please i want some files or Abaqus tutorials about that.

Thank you very much


karelmatous's picture

Predictive Multiscale Materials Modelling

Workshop on Predictive Multiscale Materials Modelling was held at the Isaac Newton Institute for Mathematical Sciences, University of Cambridge UK. Slides and videos of all presentations can be seen at the workshop website

Yonggang Huang's picture

Professor Christensen has published an interesting article in JAM

Professor Richard Christensen, Stanford University, has published an interesting article "Evaluation of Ductile/Brittle Failure Theory and Derivation of the Ductile/Brittle Transition Temperature" in the February, 2016, issue of Journal of Applied Mechanics.  This paper provides a very unique  approach to ductile/brittle transition.  The pdf file of the paper is attached.


Teng Li's picture

Yong Zhu is the new Editor of the iMechanica Journal Club

Yong Zhu, of North Carolina State University, will become the new Editor of the iMechanica Journal Club starting from Jan. 1, 2016. His research addresses basic and applied problems at the intersection of solid mechanics and micro/nano-technology, which has been recognized by a list of awards, including the 2015 ASME Sia Nemat-Nasser Early Career Award.


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