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investigation on mechanical properties of clay-polymer nanocomposites

Submitted by Ali R. khalighi on
research

Hi all

I have a question and need for guidence.

I' m working on mechanical properties of polymer based nanocomposites as my thesis. I'm a beaginer in open sourse FEM programs.

I want to modele clay, polymer and specialy interactions between them to investigate bending properties and enhancements.

Is it possible for me to use commercial programs like  ABAQUS? Which programe do you prefer?

I will appreciated if any one could help me to identify witch method is more suitable for investigation in this field.

The Paris equation

Submitted by raulito on
research
fracture
deformation
LEFM
plasticity etc
The  Paris equation should correctly be referred to as the ERDOGAN-PARIS equation, maybe some more names may be needed.
LEFM is a term bandied about in the text books, but very few texts  know how to define what it means and how it applies.
You can take my course.  What happened to the earlier posts about my course.
Anyone who contributes to my DORN-RAJNAK or HARPER DORN will be given credit.
 

Domain structures of ferroelectric nanotubes controlled by surface charge compensation

Submitted by Jie Wang on
research
Ferroelectric nanotubes
Domain structures
Charge compensation

Ferroelectric nanotubes have potential application in inkjet printing and drug delivery due to their piezoelectric property and unique geometry. For different applications, different electrical boundary conditions are applied to ferroelectric nanotubes. In the present work, domain structures in ferroelectric nanotubes (FNTs) under different electrical boundary conditions are predicted through a phase field model. Simulation results show that domain structures are highly dependent on the compensation of polarization-induced surface charges.

How to execute a python function in abaqus

Submitted by alex_612 on
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Does anyone know how to execute a python function in abaqus?

If I have a python function, I can input the dimension of the structure and the generate a Abaqus model. However, I don't know how to execute this python function in Abaqus.

 For python script, it just type

abaqus cae script=myscript.py

But if it is a function, how to call it using Abaqus?

 Thanks a lot!!!

ENERGY IN THE AGE OF CLIMATE CHANGE - Italy Joins European Nuclear Power Revival

Submitted by Mike Ciavarella on
research
nuclear energy
grand challenges in engineering

Speaking of Grand Challenges, why we never talk of Energy in Imechanica? There are certainly mechanical implications. And Energy is top of the list at the www.engineeringchallenges.org project.

http://www.spiegel.de/international/europe/0,1518,druck-554969,00.html&…;

Italy Joins European Nuclear Power Revival

 

Simple ABAQUS beam contact problem (errors)

Submitted by PJtree23 on
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Computational Mechanics Forum
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research

Hello,

 

Just started ABAQUS last week.  How can I model to beam that contact
each other?  They just seem to go through each other, and when I define
interaction contraints as "ridgid" bodies the I get several errors.

 

Does anyone have a link or a copy of a tutorial I could go through showning exactly how to run a contact element case?

 

Thanks,

PJ 

(sorry if you already saw this in as imechanica, i didnt see how to select the correct section) 

Time dependent vs Independent

Submitted by HariKrishna on
research
computational mechanics
Plasticity
creep

In Computational mechanics, for rate(time) dependent calculations (eg. Creep, plasticity), when we say time step dt, does it mean physical time.

Can I think this way:

I start at time 0 and calculate stress, strain etc  after 1 sec, 2 sec, 3 sec..

Also, what exactly is strain rate? why do some books say ..'when a strain rate is applied'''..I'm confused..dont we just apply displacement or force all the time.

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