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Non Linear Analysis Ansys

When Working on Ansys Non Linear Static Structural Analysis, I couldn't comprehen while defining and assigning material properties to corrosponding bodies.

When I give different random values for density in Engineering Data and runing the jobs parallely the results look SIMILAR for all the independent values, I couldn't fish out on what basis do the software is giving out results.

Lagrange Multipliers in Multi-body Finite Element Code

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I'm working on a Multibody dynamics code using the finite element method to simulate the behaviour of flexible beams (using this paper if anyone is interested/ it is relevant). I'd like to model joints, and as I only need spherical friction free joints I believe this should be easy using Lagrange multipliers.

James R. Rice will receive the 2014 Theodore von Karman Medal

Professor James R. Rice, of Harvard University, will receive the 2014 Theodore von Karman Medal.  Here is a link to an announcement.

Lallit Anand will receive the 2014 Drucker Medal

Lallit Anand will receive the 2014 Drucker Medal.  There will be a symposium in his honor at the International Mechanical Engineering Congress & Exposition, 14-20 November, Montreal, Canada.  See you there.

Abaqus dynamic explicit

Hi all,


Would you please let me know if it's possible, how to identify the length of mesh, time period of step, factor scaling, ... of an Abaqus dynamic explicit problem.

Thanks in advance, 

Stress Recovery in XFEM

Hello all,

I am new to imechanica so pls forgive me if I make a mistake.

I have a coplue of doubts while recovering stresses from XFEM.

My problem statement has an inclusion with some eigen strain, embedded in  an infinite matrix. I have solved the problem for displacements using XFEM. I need to get the stresses at a point close to the interface.

The 2nd Sandia Fracture Challenge is here!

update, 7/24/2014: The information packet ("SFC2-challenge-v5.ppt") is no longer attached to this post (iMechanica has a file size limit of 1 MB, so we can not attach the 6 MB file). IF YOU WOULD LIKE THE INFO PACKET, PLEASE E-MAIL ME, and copy Dr. Sharlotte Kramer, If you have an older version of the information packet, please also e-mail for the newest (v5) info packet.

We intend to send the shear calibration data to all those whose e-mail address I have by August 1st (sorry for the delay!).

Source for Mooney-Rivlin coeffcients for silicon rubber

Hi everyone,

I am trying to simulate the behavior of a silicon rubber membrane which is being compressed due to the displacement od an additional part which is bonded to it. I want to model the membrane as a Mooney-Rivlin hyperelastic model. Can therefore anyone provide me with a source giving C10 and CO1 coefficients for silicon rubber?

Any help will be appreciated,


How to set the element coordinate system for truncated cone composite shell in Ansys ?

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Hello, everyone! 

Now, I'am trying to analysis a truncated cone composite shell subjefcted to compression load in Ansys. But I don't know how to set the element coordinate system. I want to set the circumferencial direction as fiber direction, and the thickness direction and generatrix direction as transverse direction. Can any one teach me how?

Thankful to any adivice? 

Dry Gas Seal Primary vent suction perssure HI Hi

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We have installed new gas compressors solar titan 130 turbines
driven. Unfortunately, we have problem of primary vent suction pressure for dry
gas seal (John Crane) Hi Hi.

Our operating parameters are:

Compressor suction pressure: 60 bar.

Please support "Theoretical and Applied Mechanics" at Stack Exchange

Hello everyone,

I've proposed a new Stack Exchange site called "Theoretical and Applied Mechanics" for people intersted in mechaics related issues.  The current link is

For the proposal to be accepted to go to the next stage the site will need the  following:

- 60 people to follow the site

Hencky's hyperelastic material model.


I am working on my master's thesis. I have to find best fitting hyperelastic material model for simple shear test.

My task is to find most proper material model which will fit my laboratory test data. I have conducted the "single lap test" on bricks, using polymer PS.

tigerofmahdi's picture

I need this book.

I need this book highly. 

anyone have PDF of this book?


"Impact strength of materials" by W.Johnson 

Journal Club Theme of March 2014: 3D Experimental Measurements in Soft Materials

3D Experimental Measurements in Soft Materials - from measuring cell displacement fields to complex hierarchical material deformations and beyond

The Why? - Why do we need 3D material deformation measurement?

Matlab Code for Material modelling

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Hi all,

 I want to write a matlab based code that will be able to describe material behaviour under uniaxial loading. So what I am interested in is the plasticity of a material. I want the code to be able to represent material behaviour after yielding and also cyclic loading.

Pradeep Sharma's picture

Liping Liu is the recepient of the 2013 Eshelby Mechanics Award for Young Faculty

It gives me great pleasure to announce the outcome of the 2013 competition for the Eshelby Mechanics Award for Young Faculty. This award is given annually to rapidly emerging junior faculty who exemplify the creative use and development of mechanics. The intent of the award is to promote the field of mechanics, especially among young researchers. The selection committee consisted of: K. Ravi-chandar (UT Austin), Huajian Gao (Brown University), Kaushik Bhattacharya (Caltech), Roger Fosdick (Minnesota University), and Yonggang Huang (Northwestern University).

tigerofmahdi's picture

Which is older??

hi every body:

What's your idea?  The virtual displacement is special case of hamilton's principle or the hamilton's principle come from virtual displacement?  Or, Which is older?

Residual stress theory measurement new NDT.


Residual stress theory measurement new NDT.



The equipment consists of a vibrometer and a pulse generator at constant energy.
The elastic energy transmitted from the pulse generator at constant energy, on the surface of the metal, variable with the hardness of the metal itself. This elastic energy, however, remains unchanged at each corresponding hardness.

Vicky Nguyen is named Editor of the iMechanica Journal Club

vicky NguyenVicky Nguyen, of the Johns Hopkins University, is named Editor of the iMechanica Journal Club.  Vicky has a broad vision for mechanics, and has made contributions to diverse topics.  in 2008, she received the Presidential Early Career Awar

Carbon-epoxy composite plates with edge crack modeling by FRANC 2D/L

Hi, All

 Can someone help me for modeling composite plate contaning edge crack by FRANC 2D?

thank you


Abaqus Standard /General contact with penetration

Dear Colleague, 


I am running Abaqus Examle Problems Manual 1.1.18 - The self contact on rubber gasket.  


I tried to convert the self contact and surface contact definition to a general contact definition. However, the rigid surface just penatrate the model like this shown below.


Left image is the result for the inp from manual. The right one is the result for compuation with general contact.


Does somebody here want to discuss or maybe explain this for me ?


Thank you in advance. 



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