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Discrepancy of numerical results from analytical solution for an nonlinear viscoelasticity model

  I have written a Fortran code for nonlinear viscoelasticity according to the Hughes' recurrence algorithm based on a total Lagrangian formulation.  And a relaxation test is made. There is some deviation from the analytical solution(Theoretically the stress response should be an exponential decay plus a constant, isn't it?). The numerical ultimate stress is larger than the analytical one. As a larger initial strain is applied, the deviation is smaller. For a inital strain of 10%, there is almost no difference between the num. and analy. solution. What can account for this?


pin forces in ANSYS

hi all,

i am doing static analysis on a pick and carry crane, i need to find the pin forces. for this i created entity set with the nodes where the forces are to be derived and ran a static analysis in ansys.In order to derive the forces , i first picked the entity set and then applied the nodal loads from the list result options. the result that i got was not fine. it states there was zero forces on the pins, but its not.i need to find the pinforces, so kindly let me know , how to do it.




LBB Modeling in ANSYS

Hi every one.

i realy need to know how can model and solve LBB condition for a simple example in ANSYS.please help me.

god bless you 

question about abaqus

Hi guys

I want to simulate a problem with abaqus,but during runing of my project,percent of process not increas for axample when i change mesh sizes to biger runing go up to 50 % and when i change mesh sizes to smaller than the previos size,it occure again but in 25%

is there any one that know about this problem,i'm trying to solve it for 2weeks but i cann't.

I'm waiting for your suggestions...

masoudeng's picture

ansys rotor dynamics analysis

dear all

I need information about ansys rotor dynamics modeling and vibration analysis. please help me in this reserc. 

tanks everyone.


Crack modeling

Hi guys

I want learning about crack modeling in abaqus,

is there anyone to give me some example about crack modeling in abaqus?I think working on example is too faster to learn about modeling this type of events.

I'm waiting for your help

arun689's picture

dynamic loading

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i m, arun sahu student of IIT mtech thesis is effect of dynamic loading on slope stability analysis in open cast mines.i hav startted my work using software ABAQUS.can i give velocity as input in abaqus?

and here i just want to give trapezoidal form of load up to 2 plz help me in these ...............


Hello everybody

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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

bugatti87's picture


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

Can I retrive strain increment in ABAQUS with python?

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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,

mkury0121's picture

Abaqus Pin-on-disc Simulation problem

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 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?

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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.

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...


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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:

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

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


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