Hello everybody


I do my thesis on bearing capacity of foundations near slopes, I use mohr coulomb plasticity with el asticity

but I cant understand what should I do and why my result is dependent on the mesh size and why when I refine elements near

foundation the bearing capacity of the foundation becomes smaller please help me how can I do this thesis



Could you tell me how to define inflow and outflow eulerian boundary in ALE? MY ERROR IS "An Eulerian boundary region cannot overlap a sliding boundary region"

Defined in the first interface surface, and then modify the inp file, change to add



Then, I go on the File/Import/Model...inp.file  - when he fined warning

WARNING: The following keywords/parameters are not yet supported by the input file reader:

bugatti87's picture


how can i define frequency domain viscoelastic material & electrorheological in abaqus ?

Can I retrive strain increment in ABAQUS with python?

Dear all,

I just finished extrusion process simulation in ABAQUS with the input of stress-strain data. Now I want to retrive the strain increment of certain element during each deformation increment. Surely one can write straininc to a *.txt file when simulating with VUMAT. But the simulation of extrusion will be extremely slow with VUMAT. So How can I get the strain increment when simulating with the input of stress-strain data? 

Best regards,






 I am trying to model a sheet of Poly Vinyl Butryl (PVB), which is a viscoelastic material in ANSYS. I have all the regular properties like elastic, shear and bulk modulus, poisson ratio, denstiy and damping factor. I also have a stress- strain curve of PVB. With all this data, is it possible for me to find the various constants in the viscoelastic models using ANSYS?



Acoustic analysis in Abaqus

Dear all.

I hope you are well,

I want to know how i can analyze the acoustic and noise problems with Abaqus? can anyone recommend me some valuable tutorials or documents to start? or is there any superior software in order to work on these subjects?


hossein_r's picture

install franc3d


Hi all

 I want to install franc 3d , i read the installation guide in  the site:


You can examine the documentation at . Below, I will try to explain how to install, start and use the program in a very basic way.


How to model FRP in ANSYS or ABAQUS?


I am new to ANSYS and ABAQUS. 

Can anyone help me on modelling FRP in ANSYS or ABAQUS?

The type of element I have to choose is a question for me. I want to model a steel beam upgraded with FRP.

Best regards

Foundation on soil - ABAQUS

Hi there,

 Recently I have modelled a 2D block of soil, at the first step of analysis the soil block subjected to a gravitational load (Gravity) and gravitational stresses generated in the soil block, at the second step, a little rectangular part of soil block removed and currently a concrete block with same size of removed soil embedded on the soil block. this concrete block to be subjected a surface loading.

but the problem is that when i remove the rectangular part of soil, and embed the concrete block instead, I see some space between concrete block and soil and i dont want this.

to solve this problem what should i do?

you can download my abaqus file using the link below :

Abaqus error: code 5

Hi all,
I am trying to run a VUMAT subroutine for isotropic hardeining, whenever I input the command "abaqus j=inp_name user=subroutine_name " the analysis begins, the ODB file is generated but in few secs the analysis exits with an error, and the error is..

Abaqus Error: The executable C:\ABAQUS\6.7-1\exec\explicit.exe
aborted with system error code 5.

It also says...


How can one install pngwriter with MinGW and Code::Blocks?

Also can anyone suggest some easy visualization library/tools for C++ that can be useful for simulation.

Need user material Fortran code for viscoelastic

Where I can find the subroutine of a user material Fortran code for Viscoelastic constitutive model?

Does anyone has the subroutine for LS-DYNA ?

Can anyone help me?

stepTime VS. totalTime

Hello everyone,

 I have a problem with one user subroutine.

The fact is that, debugging the subroutine I see the totaltime different from the steptime. I am using just one step and the .inp implementation is veryfied with a different user subroutine, so totaltime and steptime should be exactly the same (but they are not...)


The value of the total time is around 1e-8 and the value of the steptime is around 1e-55.


Could anyone give me a clue?


Thanks in advance.

Question on Abaqus Mohr-Coulomb hardening definition

Hi Expert,

 I'm a newer of Abaqus. I was trying to compute a simple compression problem using Mohr-Coulomb model. I found the slope of stress-strain curve from the results is double of that defined in the input file. I don't know what's cause it or my understand of the slope is wrong.

Only one 8 node C3D8 element is involved. To simplify the question, let the friction angle be 0, it reduces to a Tresca model actually. The material is defined as:

 3.350000E+07, 2.000000E-01,

The hardening slope defined above is 3.35E+6.

Mu.Hesan's picture

Question about specific boundary condition in Fluent

Dear Friends

Does anybody know how can I add following boundary condition in Fluent software for outlet of an internal flow ? Is there any easy way without needing UDF or etc.

Specific boundary condition in Fluent

Where p is pressure, Re is Reynolds number and vn is the velocoty component normal to the outlet section.


Modal Analysis in Ansys to get natural frequencies and compare them with theory results

Hi, I'm Pietro, a short term Italian incoming student at VT (virginia tech).

My advisor, in order to start my thesis there about skin friction coefficients in a scramjet combustion chamber, gave me a Modal analysis to do on a gage described as follow:

a cantilever beam  (1mm diameter and 3cm long cylindrical shape) with 1mm depth and 1cm diameter cylindrical flat "hat" attached upon.

Base constraints: zero displacements, zero rotation

On the top is applied a costant, mono direction wall shear stress of 200 Pa, so a 0.0157 N of wall shear force (but i don't think it needs for modal analysis).

Maximum strain from 6000 frames of a step in ABAQUS/Standard

Dear All,

 I have the following problem: I'm doing a time history analysis of box-shaped reinforced concrete shear wall. It has four faces, each face consisting of about 400 shell elements. I'm interested in the maximum shear strain that occurs during the whole time history analysis. I'm running this analysis on ABAQUS/Standard and input the time history of accelerations from a file which has a total time of 10.6s @ 0.0018s interval. Apparently, my analysis creates around 6000 frames in one step, corresponding to time history analysis. I would like to plot the maximum shear strain in all the elements on each face.

IOSOnier's picture

New IOSO video tutorial (with SolidWorks, Icem, CFX)

Dear Colleagues,

Francois Barthelat's picture

Subset Splitting Digital Image Correlation (SSDIC)

Following our recent article on this new method, we are making our Matlab routines available. The package contains standard DIC, SSDIC, plus a few extras. More info here

Choice of the analysis for stress relaxation of PBT in real time scale

I am trying to simulate the long term behaviour of the PBT (polybutyelene terephtalate) thermoplastic.

The mesh and initial stress distribution data (after ejection from the mold) were exported from Moldflow commercial program as Abaqus input (*inp) file. By default, I have already got a fist step of the simulation (linear elastic properties of polymer). What I actually need now is to simulate the long-term performance (for example in the interval of hundreds or thousands hours).  It means that the real time scale is of the utmost importance for the analysis.

Modeling post-tensioned concrete in ABAQUS

Hi All,

 I want to model post-tensioning tendons embedded with concrete structure. Both ends of tendons are anchored. Can anyone inform me what kind of element most suitable to model the tendons and concrete structure in ABAQUS? I tried solid part for both items, yet as the tendon diameter is very small if compared to the concrete dimension, the resulting number of mesh on the concrete structure is very large.

I generate a box-like concrete and use the cut extrusion function in ABAQUS to create the ducts at which the tendons are to be located in the Assembly module. The diameter of duct is equal to the diameter of tendon, hence small instances are seeded at the edge of duct end before generating mesh.  

Ansys and 2D/3D in electromagnetics

I have a problem modelling electrical conduction in Ansys. I started with a 2D model where two current excitation sources are applied (one positive and the other negative). I use the potential difference at two opposite points to determine the resistance based on potential drop technique with a square electrode configuration. The problem is that electrical resistance is a reciprocal function of plate thickness, which means that it gets bigger as the plate thickness is reduced. But Ansys gives one number for the electrical resistance and I'm having a hard time comparing it to the theoretical value.

In 3D, I keep getting a resistance that is twice as big as theory predicts. I'd appreciate any assistance.

IOSOnier's picture

IOSO optimization benchmarking from Japan

Dear Colleagues, 

Our company, the leader provider of Global Optimization Software based on unique Optimization technology IOSO, regularly takes the opportunity to test their software on well-known, special and in-house benchmarks. With the help of famous scientists using our software, our partner companies and our representatives as well as our customers we are ready to show that IOSO is capable to solve various types of optimization tasks coming from various sources. 

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