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software of interest to mechanicians

How to model spring damper system in ls dyna 12.1

hi how r u im doing a project based on landing gear struts system . i want to replace hydralic landing gear system by spring damper system in ls dyna . plz guys i need urgent help i m short ov time plzzz help me out

A free program to generate interface elements in an existing FE mesh

Hello all,

Last year when I started implementing interface elements to model material failure, I realized that the formulation is easy except how to generate a mesh with interface elements. I did a googling to search for such a free program. Amazingly, I did not find any although there are many researchers working on the fracture mechanics field.

So, I wrote a small object-oriented C++ program which reads a FE mesh, duplicates nodes and insert interface elements where asked. The program is able to

(1) insert 1D/2D interface elements everywhere in a FE mesh

ABAQUS user material subroutine VUMAT and Eulerian mesh...

Hi there,

 Has anyone ever used a vumat subroutine with Eulerian elements? it seems that the stress update formulation is different from the way it is in Lagrangian approach! If you have any experience in this regard I'd highly appreciate if you share it with me.


my first step with abaqus

hello i am in my first contact with abaqus  i worked with plaxis but i want to model a pile in cyclic load i think that abaqus is more complete than plaxis but can any body show me how to start using abaqus in geotechnical problem

best salutations

Couple field Analyses in Abaqus

i need to know how Couple field analyses i.e (Electrical-thermal-strucutral) to be done or can be done in Abaqus 6.10

interaction for a beam element embedded in a 3D solid block

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Hi everyone,

 I am trying to model a beam element (which is supposed to work as a pile) embedded into a 3D block solid of soil.

the beam element (pile) is supposed to have 2 interfacial interactions; 1) tangential and normal contact at the end of beam element , 2) tangential and normal contact on the beam circumference. 

could anyone explain how to define this type of interaction?

I really appreciate that.


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!





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