homogenization

Two PhD positions at JWI&BSRT Charite Berlin: Multiscale modeling of MMTs

Submitted by petervarga on Fri, 09/02/2011 - 07:08

The research laboratory for Quantitative Acoustic Microscopy and High
frequency spectroscopy of the Julius Wolff Institute &
Berlin-Brandenburg Graduate School for Regenerative Therapies, Campus
Virchow-Klinikum - Prof. Dr. Kay Raum – is opening the two Doctoral
Researcher (PhD) positions immediately.

We are looking for two motivated graduate students with excellent
academic performance and interest in conducting interdisciplinary
research.

Position I

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Position ID: DM.138.11

A homogenization analysis of the field theoretic approach to the quasi-continuum method

Submitted by Vikram Gavini on Thu, 05/26/2011 - 21:38

Dear Colleagues,

I wish to bring to your attention my recent work with Liping Liu on "A homogenization analysis of the field theoretic approach to the quasi-continuum method" to appear in the Journal of the Mechanics and Physics of Solids. Below is the abstract and attached is the preprint of the article. I will very much appreciate your comments and suggestions.

A Homogenization Analysis of the Field Theoretic Approach to the Quasi-Continuum Method

VAMUCH, a general-purpose micromechanics code

Submitted by Wenbin Yu on Wed, 11/24/2010 - 22:47

Heterogeneous materials

Why penetrable model can be assumed in random?

Submitted by victorye on Thu, 09/30/2010 - 17:52

There is a lot of homogenization theories based on penetrable model or some other name like 'overlapping', 'randomly imbedded model' to analyze random microstructure. In reality, the fibers or inclusions can not be penetrated into each other, so why they use this assumption anyway?

Thanks for your opinion.

Correct Average of Stress/Strain Microfields

Submitted by adz on Tue, 06/22/2010 - 10:34

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porous material

This is a general micromechanic question.

Suppose we have a microstructured 2-phases material with random inclusions (or a porous material with random pores) and we make a real tensile test (monoaxial loading in the vertical direction of a specimen with nominal length L). We want to model such tensile test with FEM (for instance with Abaqus) like in this pic:

unit cell model

Submitted by ABAqirl on Fri, 06/04/2010 - 15:49

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unit cell model

Hello Everybody,

I have some problem, i use 3D unit cell model for the calculation of stress-strain curve of the soft plastic matrix with rigid inclusion. after calculation i take the reaction force, devived it into cross -section of ma specimen=this is my stress, and strain i obtain by deviding the displacement into he initial length of the specimen. nevwrtheless i think it is necessary to use some homogenization scheme to obtain the stress-strain response of the material. Could you please help me what should i do?

Best regards

ABAgirl

Phd position in computational mechanics

Submitted by Angelo Simone on Thu, 05/06/2010 - 23:17

A fully funded PhD position is immediately available in the area of multi-scale modeling of geomaterials within the research project "Failure of cohesive geomaterials: bridging the scales - GEOBRIDGE" at Laboratoire Sols, Solides, Structures - Risques (3S-R), Université Joseph Fourier, Grenoble, France.

New paper on a Gurson like fracture model for plastically anisotropic materials

Submitted by Anonymous (not verified) on Thu, 05/06/2010 - 21:35

anisotropic plasticity

Hello All. This is my first blog entry in iMechanica!. This post is about my new paper with Prof. Amine Benzerga entitled "A constitutive model for plastically anisotropic solids with non-spherical voids", accepted for publication in JMPS (URL: http://dx.doi.org/10.1016/j.jmps.2010.03.007 ). In case you are not able to view the online version, a preprint of the paper is attached. This paper should be of interest to anyone working in the ductile fracture area. Your comments and feedback are welcome.

PhD position in computational mechanics

Submitted by Angelo Simone on Sat, 02/06/2010 - 22:35

A fully funded PhD position is available in the area of multi-scale modeling of geomaterials within the research project Failure of cohesive geomaterials: bridging the scales - GEOBRIDGE at Laboratoire Sols, Solides, Structures – Risques (3S-R), Université Joseph Fourier, Grenoble, France.

2D approximation of heterogeneous 3D media

Submitted by phunguyen on Mon, 02/16/2009 - 11:21

homogenization

averaging

heterogeneous media

Dear All,

Could somebody indicate me some literature about the topic "2D
approximation of heterogeneous 3D media"?

In particular I am interested to address following issues:

1) Under which conditions averaging thermal conductivity and young
modulus (or more general, mechanical behaviour) on multiple 2D crossections of an heterogeneous "random"
material can be a good approximation for the behaviour of the real 3D
microstructure

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