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Leon Mishnaevsky's blog

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Abaqus/Python - commands to find nearest node to a given point

I need to write a python comman code to find a node (in a given set), nearest to a given point.
The code now looks as follows:
import sys
import nearestNodeModule
a = mdb.models['FibreModel'].rootAssembly
n1 = a.instances['Fibre0-1'].nodes

Leon Mishnaevsky's picture

Symposium on Nanoengineered composites: 15-17.7.2015, Denmark

International Symposium on

NANOENGINEERED COMPOSITES: Properties, modelling and applications

July 15-17, 2015, Roskilde, Denmark

Leon Mishnaevsky's picture

Computational micromechanics of composites: Postdoc stay (10 months) at Technical University of Denmark, Department of Wind Energy

<p>Applications are invited from suitably qualified candidates for a POSTDOCTORAL STAY (10 months) at Technical University of Denmark, Department of Wind Energy We offer: - 10 months postdoc stay at DTU, Risø Campus - Employment in accordance with the terms valid for scientific staff at DTU Necessary knowledge: - mechanics of materials /computational micromechanics (preferably, unit cell modelling) - finite element simulations (ABAQUS) - programming in a higher-level language (C, Fortran, Python). Necessary background: PhD.

Leon Mishnaevsky's picture

How to investigate the thin layer between graphene sheets and surrrounding polymer (epoxy)?


There is an assumption that nanoparticles (e.g., graphene or CNT) change the local properties of polymer (here, epoxy) around them, perturbing the polymer chains. Which (not too expensive) methods exist to explore this assumption experimentally? How can I study the atomistic scale structure of polymer around the graphene sheets, and compare it with rest of polymer?





Leon Mishnaevsky's picture

Micromechanics of hierarchical materials: a brief overview

A short overview of micromechanical models of hierarchical materials (hybrid composites, biomaterials, fractal materials, etc.) is given. Several examples of the modeling of strength and damage in hierarchical materials are summarized, among them, 3D FE model of hybrid composites with nanoengineered matrix, fiber bundle model of UD composites with hierarchically clustered fibers and 3D multilevel model of wood considered as a gradient, cellular material with layered composite cell walls.

Leon Mishnaevsky's picture

Fatigue of multiscale composites with secondary nanoplatelet reinforcement: 3D computational analysis

3D numerical simulations of fatigue damage of multiscale fiber reinforced polymer composites with secondary nanoclay´reinforcement are carried out. Macro–micro FE models of the multiscale composites are generated automatically using Python based software. The effect of the nanoclay reinforcement (localized in the fiber/matrix interface (fiber sizing) and distributed throughout the matrix) on the crack path, damage mechanisms and fatigue behavior is investigated in numerical experiments.

Leon Mishnaevsky's picture

Hybrid and hierarchical nanoreinforced polymer composites

Hybrid and hierarchical polymer composites represent a promising group of materials for engineering applications. In this paper, computational studies of the strength and damage resistance of hybrid and hierarchical composites are reviewed. The reserves of the composite improvement are explored by using computational micromechanical models. It is shown that while glass/carbon fibers hybrid composites

Leon Mishnaevsky's picture

Graphene reinforced polymer composites: 3D micromechanical modelling, damage and fracture

3D computational model of graphene reinforced polymer composites is developed and applied to the analysis of damage and fracture mechanisms in the composites. The graphene/polymer interface properties are determined using the inverse modeling approach. The effect of composite structure, in particular, of the aspect ratio, shape, clustering, orientation and volume fraction of graphene platelets on the
mechanical behavior and damage mechanisms of nanocomposites are studied in computational experiments.

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International Workshop 'Modeling and development of nanostructured materials for biomedical applications',


          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.

Leon Mishnaevsky's picture

Postdoctoral position in micromechanics of composite fatigue at Risø DTU

Applications are invited from
suitably qualified candidates for a Postdoctoral position in the framework of a
Danish-Chinese research project "High reliability of large wind turbines via
computational micromechanics based enhancement of materials performances"
at  Risoe DTU.

Leon Mishnaevsky's picture

Postdoc position in micromechanics of nanostructured metals and SMA at Technical University of Denmark

Postdoc position in a  European project "Theoretical analysis, design and virtual testing of mechanical properties of titanium-based nanomaterials" will be available at the Materials Research Division, Risø National Laboratory for Sustainable Energy, Technical University of Denmark.

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Merging/Boolen operation in ABAQUS Cae to produce inclusion/matrix Unit cell


I am trying to do with ABAQUS Cae now what I usually and successfully did with MSC Patran - produce a unit cell for particle reinforced composite. In other words,  I need to generate a "ball in a box" model.

So, I produce a part Cube and a  part Ball. After that I create Sections and Instances (what seems to be unnecessary if comparing with Patran, but apparently needed to link CAE with CADs), and assign Materias (lets say, Glass to Ball, and Polymer to Cube).

Leon Mishnaevsky's picture

Postdoctoral position in micromechanics of composites at Risø National Laboratory, Technical University of Denmark

Applications are invited from suitably qualified candidates for a Postdoctoral position in the framework of a research project "High reliability of large wind turbines via computational micromechanics based enhancement of materials performances" at the Risoe DTU.

Leon Mishnaevsky's picture

International Workshop on Mechanics of Wood & its Applications in Wind Energy Technogies, Dhulikhel, Nepal, 10-12 November 2008

The International Workshop on Mechanics of Wood and its Applications in Wind Energy Technologies will take place 10-12 November 2008 in Dhulikhel, Nepal.

The Call for Papers is here. Abstracts are due by April 30, 2008.

Leon Mishnaevsky's picture

Postdoctoral Position in Micromechanics and Fatigue of Natural Composites, at Risø National Laboratory, Denmark

Applications are invited from suitably qualified candidates for a Postdoc/Research Scientist position in the framework of a Danish/Nepalese collaborative research project, in the Materials Research Department of Risø National Laboratory, Denmark 

Job description: As a postdoc/scientist, you will carry out numerical micromechanical modelling of fatigue processes in wood. The theme of the project is the computational analysis of the effect of microstructures of natural materials (wood), coatings and other microscale parameters on their fatigue resistance and lifetime under cyclic loading. The experiments and verification of results will be carried out in collaboration with project partners in Kathmandu, Nepal. The deliverables of the project should include the development of recommendations for the improvement of the reliability of wind turbine blades, produced from coated wood in Nepal, as well as extracting “lessons from nature” to be used in the improvement of polymer matrix fiber reinforced composites for wind energy applications.  

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