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software of interest to mechanicians

XFEM and Cohesive Behavior combined in Abaqus


I would like to combine Extended Finite Element Method (XFEM) with cohesive behavior in Abaqus to model bulk damage as well as interlaminar damage in a material.

Section 10.6.1 of the Abaqus 6.9 Analysis Users Manual says that XFEM "can be simultaneously used with the surface-based cohesive behavior approach or the Virtual Crack Closure Technique, which are best suited for modeling interfacial delamination."

Modeling sandwich composite in ANSYS

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Hi, i need help modeling sandwich structure in ANSYS 12.1, i have found some materials online on how to do it? I have tried the basic steps. got some results, but now how do i validate that.   I have experimental data for three point bending. But i want to make sure that what i am doing in ANSYS APDL is darn right. 

inputs are,

3 layers 45/0/45

thickness 0.1/0.365748/0.1   (inch)

material i am using right now are carbon fiber and foam DH100

properties of each layer have been assumed to be isotropic

IOSO Optimization for Turbomachinery new Video Tutorials


We would like to offer you step by step Video Tutorials of IOSO Optimization coupled with Concepts NREC and NUMECA software:

1) by this we show how easily you can use direct integration capabilities between IOSO and Concepts NREC software to solve optimization tasks in turbomachinery

How to combine XFEM and UMAT in ABAQUS?

I have an idea: In abaqus, I want to simulate crack propagation by XFEM, and meanwhile I also want to define the stress update algorithm by writing a UMAT.
Anybody wants to share related experiences?

Help with Abaqus Scripting


I am new to abaqus scripting. I need some help with accessing the odb for history output.

I have a list of odbs and i need to take the displacement and contact stresses information at the end of the step.

The syntax i tried was

import odbAccess

fileName = 'static_open_c1.odb'
stepName = 'Load'
historyRegionName = 'Node HS-1.701'
historyOutputName = 'U2'



I'm trying to investigate the effect of multiple support excitation (spatially varying ground motion) on seismic response of an arch dam using ADINA, so i need to apply different acceleration (and velocity and displacement) time histories on every node on structure-foundation interface.

Abaqus - Gear in motion: static or dynamic?

Hi all,

I've to model a gearbox in the transitory (acceleration) and in the
stationary (constant speed) running: i'm not sure abut the kind of step
to use.
I'm gonna find contact pressure and stress in both case.

What about using static step for both?

ABAQUS modelling of rotating smeared crack model

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I want to know if it is possible to accomplish crack analysis in concrete by using co_axial rotating smeared crack model in Abaqus?

I need help with MIMICS software please

Hi all,

 I need some help with MIMICS software please. I have a CT scan images for the whole body and i need to create 3D object for the shoulder model to each part Humerus and Scapula and then perform some measurments then Export it to ABAQUS. Does any one have any idea. Please help.

My email is:


Thank you with my regards


Forge2008 to Abaqus (.unv to .inp) subroutine Sigini

Hello everyone,

I'm working on a linking project between two software: Forge2008 and Abaqus.My goal is to transfert output datas ( nodes,elements, stress tensor) from one software  as input datas for the next one.

In order to realise this task I have to understand the output format .unv of Forge 2008  (Universal I-deas format) and convert this file to .inp ( Abaqus)

And use the subroutine Sigini in Abaqus to put initial conditions.

So to sum up  do you have informations about .unv file (description of elements)

Run Multiple jobs at once in abaqus

Hi all,

I would like to know whether there's any method to submit a
number of Abaqus implicit jobs at once (like letting it to run whole
night without any attention)? Also is there any way to run those jobs
without opening Abaqus CAE (like in the command prompt) in a computer
with Windows vista? I have modeled everything in CAE.

Thank you!


How can I apply a certain rotation in ANSYS ?


Dear all

I have a plate model in ANSYS.

How can I apply a certain rotation on a line or on a surface in ANSYS ?

 (i.e. ROTZ=1.0)

Amit Pandey's picture

tension/compression assymetry problem in Abaqus

Hello all

 I am trying to model a composite material with different tension and compression modulus (elastic analysis).  Does anyone know how to do it ??


Thanks for help.

Disparity in Simple Shear solution in ABAQUS

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Dear All,
We tried to simulate simple shear using ABAQUS and compared it with the analytical solution. To our surprise, even though the equivalent stress and strain matched perfectly, the component stress and strain had a large deviation between the semi analytical and ABAQUS methods. The zero components in the analytical model were calculated to be non-zero in the results of ABAQUS. This paradox could not be understood clearly as whether it is a case of software deficiency or conceptual error. A COMPLETE ANALYSIS OF THE PROBLEM IS ATTACHED AS A REPORT.

contact element(ANSYS)


I will model laminated composite and it have contact element at between layers. Can anybody help me for define of contact element(ANSYS) at between layers?

thank you

Reconstruction of Saved Stiffness Matrix from ADINA


I have saved the global stiffness matrix generated by ADINA. the format of data stored is like below:

        1            1
        2            2
        3            4
        4            7
        5           11
        6           16



periodic boundary conditions in ABAQUS 6.9-1


I have a problem with applying periodic boundary condition. I have used *EQUATION in constraints for opposite nodes and surfaces. But I still have some problem with that for sure I making some simple mistake. If anyone could look at my model and find problem. Abaqus version 6.9-1 .
Thanks a lot.

IOSO and ANSYS to provide a joint Webinar on Robust Design Optimization


Sigma technology to participate in ansys RDO webinar series

Multilevel Robust Design Optimization IOSO technology coupled with ANSYS CFX will be shown for real-life application

Shearwall simulation in LS-DYNA

Dear friends,

Is there anyone who use LS-DYNA program to simulate shear wall type structure, and what kind of MAT and elements do you think is suitable to simulate the shear wall?

 Thank you!




FSI analysis of a simplified turbine using a sliding mesh

Hi all,

I exercised "Prob37: FSI analysis of a simplified turbine using a sliding mesh" ADINA tutorial. I got an error message and the program stopped solving.

The error message:


-R option cannot be used for adaptive-mesh or sliding mesh. You can use -m -M options.

What are the -R,-m, -M options? How can i solve this problem? 

Mimics®14 enables design on anatomical data

Mimics 14 comes with a CAD-like functionality, enabling you to design directly on anatomical data. 


CONTACT version 10.2 released

Dear all,

Herewith I want to announc the release of CONTACT version 10.2.

The main changes with respect to earlier versions of the program are as follows:

Your Opinions About Open Source Software

All, I am conducting a survey and your response would be very much appreciated. The purpose of the survey is to gather data that will help the developers of open source software improve the success of their projects. All replies received before midnight Sunday 26th September will be entered into a draw for a £30 Amazon gift voucher. Here is a link to the survey: Click here to take survey Thanks for your participation! Lee Margetts

boolean operation


I want to model a plate that connected with stiffening beams in ANSYS.

 beams and plates has rigidly connected together, and there were no joints.

for model this, I first make an area and secondly extend this area to make a volume.

then I divide this volume to seperate plate and beams.

this is my question :

what relation exist berween components when they divide from one volume.

I mean suppose we have a volume, then we divide it in to two parts, what relation exist between this two new



Hi all,

     Currently, I am using ANSYS 12.1 for the fatigue crack propagation simulation for the edge crack & center crack plates. It is a mixed mode crack propagation.


Can anybody please tell me or guide me how to write the code in the ANSYS using APDL for automatic remeshing around the cracktip when crack propagates to the new position?

 Thanks in advance. :) 


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