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aminzami's picture

Why Abaqus give incorrect result in plane strain plasticity?!!

There is an incorrect result from Abaqus in plane strain plasticity simulation. In this short video, this  result is shown.

It would be pleased if anybody have any idea about why this happen ?!!


YouTube link:

Suggestion on writing a paper

I am planning to write a paper for ANSYS conference in India.I was working on Static Structural Analysis for the past 1 year.I have experienced various glitches while solving the problem according to the terms and conditions provided, typical convergence behaviour and played with both linear and non linear contacts.

Suggestions for minor project

I have been thinking of doing a college minor project. but because of limited resources of materials and equipments I can take any project so please suggest me some work. The softwares I know are ABAQUS, SOLIDWORKS, MATLAB. plz suggest 

'Influence of factors unrelated to environmental quality on occupant satisfaction in LEED and non-LEED certified buildings'

The article from Building and Environment featured in this piece 'Influence of factors unrelated to environmental quality on occupant satisfaction in LEED and non-LEED certified buildings' by Stefano Schiavon and Sergio Altomonte, can be viewed freely until 31 August 2014

What is HAPPENING with the posts after a while ?

Choose a channel featured in the header of iMechanica: 

Hi eveybody


I noticed that some of the posts don't open after a short while , even some of my recent ones , and the error on the page is : no data received


what happens to the files ? are they removed by admins ? without notification ?  as far as I think , there was no problem with mine !!


sorry for asking but it was important for me to know 

Node/Elements Connectivity

Taxonomy upgrade extras: 

Inconsistency of Biography of Tsien Hsue-Shen

Tsien Hsue-Shen, an expert of mechanics, the “King of Rocketry” of China, lived in US for twenty years long. Iris Chang (by a book in 1995) and Judith R. Goodstein (by a report of a conversation with Lee Alvin DuBridge in 2003) gave accounts of Tsien’s biography.

Pressure vessel deflection



I have observed in many cases that horizontal pressure vessel with saddle support due to the internal pressure gets circumferentially compressed (vertical deflection).

Can anyone expalin why it behaves so.



Plastic J significance in CTOD equation

I am working on the validation of CTOD.

In the evaluation of CTOD using the
J-integral approach as applied in ASTM E1290 and E1820, the plastic J
component is defined as (Npl*Apl)/(Bn*Bo)
Npl=dimensionless constant(plasticity)
Apl=area under load vs. displacement plot
Bn=ligamen length (W-a)
Bo=section thickness

On E1820 there are different functions provided for Npl if Apl is
evaluated differently (CMOD or load-line displacement).


A new beginning of learning! 

Be tranquille, and just do it.


Modelling tensile simulation including necking


 i am new in using ABAQUS. I am modelling tensile simulation. elastic and plastic part were ok (isotropic). but i dont know how to include damage model (damage for ductile materials). I need stress triaxilaity, equav plastic strain and strain rate..where i can obtain that?..hope somebody can help.  Material used is ALSi12

Mechanics journal impact factors 2012

Some funding agencies require that articles be published only in journals with impact factors greater than 1. Here's a list from 2012 that tells you which to choose (if you care about impact factors).
-- Biswajit


Abbreviated Journal Title
Impact Factor

health and safety environmental management


Dear all  

i have question that i woud like to know about principle of putting monetary value on human to rduce risk and the principle of weighting the importance of risk , moreover is there any conflic between these principle  


Solid Mechanics mini project

Guys , we've been given a mini project of solid mechanics to make any simple model which shows movement . We're getting short of time so please .... Frown
I'm looking for some ideas of how and what to make .

Solid Mechanics mini project

Guys , we've been given a mini project of solid mechanics to make any simple model which shows movement . We're getting short of time so please .... Frown
I'm looking for some ideas of how and what to make .

zaphai's picture

Soil Structure Interaction

I am trying to model the soil churning action of a rotary tiller trough soil structure interaction. Based on some published articles, DEM and SPH approach both have been used to model the tool interaction with the soil. I am little confused in the selection of the appraoch. Can somebody throw some light on advantages and disadvantages of one approach over another and which approach should be chosen for more realistic results.

Hyperelastic and Viscoelastic material modelling

I have a doubt regarding the Hyperelastic and Viscoelastic material modelling in ANSYS using Mooney-Rivlin material constants.

ANSYS theory manual says that for large deformation and large strains, the material modelling (i.e. constitutive behaviour) is same for hyperelastic and viscoelastic. Is it so?

Generally,  Mooney-Rivlin material constants are used to model Hyperelastic behaviour (rubber-like materials).

A question on plasticity

Recently, I have a question on the plasticity.As the plastic materials undergo the loading and unloading process. we can find the energy dissipation from the stress and strain relation curve. Then, my question is that the energy dissipation is generated during the loading process or unloading process?Thank you very much.


Konstantin Volokh's picture

Challenge of Biomechanics

The application of mechanics to biology
– biomechanics – bears great challenges due to the intricacy of living things.
Their dynamism, along with the complexity of their mechanical response (which
in itself involves complex chemical, electrical, and thermal phenomena) makes
it very difficult to correlate empirical data with theoretical models. This
difficulty elevates the importance of useful biomechanical theories compared to
other fields of engineering. Despite inherent imperfections of all theories, a

Mike Ciavarella's picture


Given the complexity of present and
future global challenges, it is the university´s social responsibility
to contribute to society by understanding the full extent of its needs
and current and future problems, and to prepare it to deal with them
effectively and efficiently (CMES, 2009)1. In this sense, due to its
ability to take the lead in matters of knowledge creation, promotion and
dissemination, the university becomes the ultimate guidance governments

What are my Open-Access options?

As many othes, I find myself in the position that my funding agency mandates some form of parallel publishing (or preferably OpenAccess) (as well as an Open Access policy from my university itself).

I've been reading through what author rights i retain with different publishers, and among the big ones very little rights are retained.
Elsevier allows preprints to be published only if it is voluntary. That is, they intentionally prohibit mandated parallel publishing to protect their profit.
Wiley had different rights with different journals, but my first hand choice simply didn't allow parallel publishing of any kind ever.


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