micromechanics

"Plane Remains Plane" boundary condition in Abaqus

I am working on micromechanics modelling of steels. I need to implement  a "plane remains plane" kind of homogeneous boundary condition on some edges of my RVE of Dual Phase Steel. How can i do it by using *Equation option in Abaqus? I want to understand what all and how the nodes needs to be constrained? I am aware of "Planar Constraint" plugin in Abaqus, but some how it is not working for my RVE, so i want to go via the *EQUATION route. Any help would be greatly appreaciated.

 

Thanks ,

Danish 


Postdoc position in Solid/Computational Mechanics, Politecnico di Milano - Department of Civil and Environmental Engineering

Politecnico di Milano 

Department of Civil and Environmental Engineering

Postdoc position in Solid/Computational Mechanics

Fixed term position for up to 18 months

Salary: 25,000 Euro per annum


Periodic Boundary Conditions vs Homogenous Boundary Conditions in 2D RVE

Hello all,

I want to simulate loading of 2D RVE of dual phase steels, by giving individual phases properties, to get homogenised mechanical properties like yield strength,  % elongation etc, using micromechanics based approach. Litterature shows people have used two kinds of boundary condition viz. Periodic boundary condition and homogenous boundary condition for this case. My doubt is two folds:

1) What is the theoretical difference between these two kinds of boundary conditions? 

2)  how to apply these boundary conditions in a finite element framework, along with loading?. Specifically, I am interested to know what are the boundary condition on the 4 corner nodes of RVE, and how to apply loading?

Thnks in advnce,


Tuncay Yalcinkaya's picture

Full scholarships available at European Commission funded workshop on physics based material models in Izmir / Turkey

European Commission' s JRC (Joint Research Centre) is organizing the 3rd workshop on physics based material models and experimental observations (http://iwpmeo.org/) in collaboration with University of Oxford, Max-Planck-Institut für Eisenforschung and Middle East Technical University. The workshop will be held in Izmir/Turkey on 2-4 June 2014.


Postdoc and PhD positions in LEM3, Arts et Métiers ParisTech, Metz-Lorraine

The LEM3 laboratory (UMR 7239) of Arts et Métiers ParisTech, Metz-Lorraine announces 2 postdoc positions and 1 PhD position.

Postdoc position 1

Subject: Influence of microstructural parameters in service performance of automotive components consisting of SMC (Sheet Molding Compound) and SMC hybrid.
It is a project of LEM3 of Arts et Metiers ParisTech Metz, Loraine funded by external collaborator (American Company OWENS CORNING). 
Program duration 18 months, initial contract for one year.
Salary:  approximately 2000-2200 euros net.
Starting date: ASAP.


Mechanical characterization and micromechanical modeling of bread dough. J.Rheol [http://dx.doi.org/10.1122/1.4768463]

The mechanical behavior of dough, gluten, and
starch was studied in an effort to investigate whether bread dough can be
treated as a two phase (starch and gluten) composite material. Mechanical
loading tests revealed rate-dependent behavior for both the starch and the
gluten constituents of dough. There is evidence from cryo-scanning electron
microscopy that damage in the form of debonding between starch and gluten
occurs when the sample is stretched. In addition, the Lodge material model was
found to deviate from the tension and shear stress-strain test data by a


jsegurado's picture

Postdoctoral position at IMDEA Materiales (Madrid, Spain) in crystal plasticity finite element simulation of Ni-based superalloy

The research group of Multiscale Materials Modeling at IMDEA Materials Institute seeks a:
Postdoctoral Researcher (PhD in mechanical engineering or materials science)


(Ref: POST-MMM-01)

 


jenda_z's picture

Multiple post-doctoral positions in the field of modeling, simulation, assessment and optimization of multi-functional materials

The Czech Technical University in Prague - University Center for Energy Efficient Buildings offers nine post-doctoral positions in the field of modeling, simulation, assessment and optimization of multi-functional materials and structures.

Start date: as soon as possible after 21 June 2013, until all positions are filled
Contract duration: until 30 June 2015 (with a critical evaluation after the first year)

The present project integrates nine different topics, each of which will be supervised by a mentor from the Faculty of Civil Engineering of the Czech Technical University in Prague. The particular topics include


ebarbero's picture

Easily calculate longitudinal compression strength of unidirectional composites

The longitudinal compression strength of unidirectional composites F1c, also called Xc, is very difficul to test for, so often you don't have the value for the particular material (fiber, matrix, volume fraction) that you wish to use. Further, just having data does not tell you what paramaters really influence its value--it is not the compressive strength of the fiber, I can assure you. So, there is a simple formula that you can use to predict its value and also to understand what are the parameters that really affect the compression strength of the composite. For that you need to check out this paper: Barbero, E. J. (1998)  Prediction of Compression Strength of Unidirectional Polymer Matrix Composites, J. Composite Materials, 32(5), 483-502.


Leon Mishnaevsky's picture

International Conference on COMPUTATIONAL MODELLING OF NANOSTRUCTURED MATERIALS

September 4-6, 2013     Frankfurt am Main, Germany

Objectives and topics:
Development
of nanoengineering technologies and creation of nanomaterials opened
new perspectives for a number of areas of industry and everyday life.
These materials demonstrate increased strength, toughness,
biocompatibility, and can ensure higher service properties, reliability
and lifetime of devices and systems.


Problems with numerical integration of discontinuous functions

Hi everybody,

 I am a very beginnerin doing research :-) and my topic is about "micro indentation analysis using continuum dislocation theory". I am applying high-order finite element method for this nonlinear problem.

My plan is first writing a subroutine for the element. However, when I intend to compute the internal force by using Gauss integration, I see a problem with the integrand function of some index of the internal force vector. This integrand is discontinuous function. It is therefore, I cannot get a good approximation with the standard Gauss integration. 


Problems with numerical integration of discontinuous functions

Hi everybody,

 I am a beginner in doing research :-) and my topic is about "Micro Indentation Analysis using Continuum Dislocation Theory". I am applying high-order finite element method for this nonlinear problem.

 My plan is first writing a subroutine for the element. However, when I intend to compute the internal force  by using Gauss Integration, I see a problem with the integrand function of some components of the internal force vector. This integrand is discontious function. It is therefore, I cannot get a good approximation with the standard Gauss integration.


Jean-Michel Pereira's picture

Experimental Micromechanics for Geomaterials

A joint workshop of the ISSMGE TC101-TC105: Experimental
Micromechanics for Geomaterials
will be held on 23rd-24th May
2013 at The University of Hong Kong.

Abstracts are now invited, until the 1st October 2012. They should
be 200-300 words in length, written in English, and show relevance
to the theme of the workshop. Abstracts should be sent to Ms Bridget
Lam. Email: owlam@hku.hk (subject: EXP MICRO 2013)

See also attached flyer.


Yongming Liu's picture

Postdoc and PhD positions at Arizona State University

One postdoc and several PhD student positions are available at Arizona State University for fall 2012. Research background in at least one of the following areas is preferred.

1. Fatigue and fracture of materials and structures

2. Computational mechanics and micromechanics

3. Damage detection for composite materials

Interested candidates please send application documents to yongming.liu@asu.edu

Thanks!


Post-Doc/PhD in mechanics of grain boundaries at Max-Planck-Institut für Eisenforschung, Düsseldorf

MPI für Eisenforschung, Düsseldorf, Department for Microstructure Physics and Alloy Design
Post-Doc or PhD Position: Characterizing and modeling the mechanics of crystalline interfaces

Requirements
A solid background in physical metallurgy, polycrystal mechanics,
dislocation plasticity, continuum mechanics and proficiency in English
are required. Prior experience in microstructural characterization such
as EBSD or AFM is beneficial. Programming skills (Fortran, Python,
Matlab) and experience in numerical simulation and finite element
modeling are strongly appreciated.

Background


Computer Aided Design Environment for Composites (CADEC)

CADEC is an online application that performs composite materials analysis as described in the textbook Introduction to Composite Materials Design-- Second Edition, CRC, 2010.
This web application implements the equations for:

  • Micromechanics
  • Ply Mechanics
  • Macromechanics
  • Strength
  • Damage
  • Fabric-Reinforced Composites
  • and Beams

http://www.cadec-online.com


Wenbin Yu's picture

New Release of General Purpose Micromechanics Code: VAMUCH 3.0

I am writing to let you know the release of VAMUCH 3.0,  the 3rd version of our general-purpose micromechanics code. The main new features are:

1. Multiphysics capability: VAMUCH can be used to homogenize heterogeneous materials which have coupled or uncoupled responses to mechanical field, electric field, magnetic field, and thermal field.  It not only predicts elastic, conductive, dielectric, magnetic, and diffusive properties of heterogeneous materials but also coupled properties such as coefficients of thermal expansion, pyroelectric, pyromagnetic, piezoeletric, piezomagnetic, and/or eletromagnetic properties, as well as the local fields corresponding to these multiphysical responses.


Stephan Rudykh's picture

Stability of anisotropic electroactive polymers with application to layered media

The stability of anisotropic electroactive polymers is investigated. A general criterion for the onset of instabilities under plane-strain conditions is introduced in terms of a sextic polynomial whose coefficients depend on the instantaneous electroelastic moduli. In a way of an example, the stable domains of layered neo-Hookean dielectrics are determined. It is found that depending on the direction of the electrostatic excitation field relative to the lamination direction, the critical stretch ratios at which instabilities may occur can be either larger or smaller than the ones for the purely mechanical case.

DOI: 10.1007/s00033-011-0136-1


Lee Margetts's picture

Royal Society - International Newton Fellowships

2 Year PDRA Opportunity in:

Image Based Modelling to Improve Damage/Fracture Tolerance in Materials


Postdoctoral Position at University of Pittsburgh -- Cell and Tissue Mechanics

Postdoctoral Positions at the University of Pittsburgh in Cellular Mechanics and Biophysics of Morphogenesis

Postdoctoral Positions are available for highly qualified and motivated candidates to study the physical principles of morphogenesis in the Davidson Laboratory at the University of Pittsburgh in the Department of Bioengineering. The laboratory focuses on studying the molecular-, cellular, and tissue-scale processes that regulate mechanical properties and force-production during morphogenesis. Projects involve a combination of biophysics, cell biology, bioengineering, and embryology.


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