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Is it possible to solve buckling in Abaqus with only residual stress defined as predefined load?

Hi Sirs,

As title, I wondering if the problem can be solved with only material residual stress but no other external load applied?

After several trials, Abaqus returns message

UMAT for MAZAR's Concrete Damage Model

Hello All,

I am working on stochastic upscalling of damage in concrete microstructure. Can someone provide a UMAT for Mazar's damage model or any resource to help me create UMAT on my own.

Thank you.


Vasav Dubey

Texas A&M University

Texas, USA


Frank Richter's picture

UMAT for Zener model and Kelvin-Voigt model

Dear iMechanica community,

you can find the UMAT-implementation of a Zener model, i.e. a Maxwell model parallel to a spring, in my PhD thesis:

“Upsetting and Viscoelasticity of Vitreous SiO2: Experiments, Interpretation and Simulation“
Technische Universitaet Berlin, Germany, 2006

Hidroxid's picture

Applying a moving pressure and traction in Abaqus

Hello all,

I have applied a moving ellyptical hertzian pressure load on a surface using a DLOAD which works, but I also need the traction load which is the multiplication of this pressure with a friction coeffcient.

Does anybody have any clue how to do it? Directly through abaqus or inside the same DLOAD?


Kind regards,


renganathan sekar's picture

How do I rectify an error regarding memory storage when I generate substructures in ABAQUS?

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I have been trying to generate a substructure in ABAQUS for a big diameter roller bearing. I have used two reference points, one each for inner and outer raceways to couple the inner and outer raceway surfaces. I have two steps in the analysis. The first step is Frequency followed by Substructure generation step. The analysis runs fine till the end of first step and calculates the eigen frequencies. When the second step starts, following error message appears.

" Element 439473 requires more than 2GB of memory for storage"

Pressure Difference Calculation in ABAQUS

Hi everyone, 

I am working on ABAQUS to simulate Pipeline Inspection Gauge (PIG) movement in a pipeline via CEL technique. I am unable to find how to calculate Pressure Difference in the pipeline using Abaqus.

If anyone of you can guide me through it.


MD Aftab

Modeling with line spring elements to find failure pressure of steam generator tube

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Hello, All
I am trying to model steam generator tube of length 110 , radius 11mm, thickness 1.27mm. It has 2 axial cracks of length 6.35mm. length between 2 cracks is 0.254mm. 

Simplified slip-bearing action by using stop ellement in Abaqus

can anyone please advise me to define connector ellements with following details:
Using rigid plastic CARTESIAN element and a STOP element in parallel and The connector behaviour must be:
1- rigid up to the slip force limit Rn
2- slip at the bolts up to ±1 mm at constant force Rn
3- rigid bearing hardening


ABAQUS, partitioning an edge

Hello Everyone,

Does anyone knows how it is possible to partition an edge in one step with multiple points (like multiple datum points or multiple parameter values)? I know how to partition one edge one by one. The problem of doing it one by one is the amount of time that it takes to do that. For example if I want to put 50 points on one edge I have to pick that edge 50 times and partition it, which takes a lot of time.

I am doing the whole process by scripting with Python so I would be glad if the solutions are in scripting format (I am using ABAQUS 2016).

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Time: 10:00 am EDT 

Venue: SIMULIA Great Lakes Region, 3200 Greenfield Road, Suite 310, Dearborn, MI 48120

Organisers: SIMULIA Great Lakes Region, Ms Lynne SUNDBERG

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Senior structural simulation engineer


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How to obtain the Force-Indentation depth curve of nanoindentation FEA?

Dear all experts,

I did FEA of nanoindentation with using Abaqus and considered displacement of reference point (RP) on the indenter as a punching tool. Moreover, Abaqus/Explicit method  was applied for solving problems.

But I do not know how to plot Force-Indention depth curve via FEA with using Abaqus.

Any suggestions would be greatly appreciated.


shreeram111's picture

UMAT Non linear Viscoelasticity - Algorithm verification?

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Hello everybody,

           My task is to write a UMAT for Non-linear Viscoelasicity based on Schapery's model in ABAQUS. I have coded the routine, but I am still not able to predict correct response. I tried to debug it as much as I can. I understand that it would be difficult for anybody to understand my code. So, I have attached a flowchart (pdf) of the whole algorithm that I follow. It would be nice if you could check that and correct me if I am wrong.

Thanks in advance for your time and consideration



Dario Schiano Moriello's picture

Formulation of Continuum Shell Elements - ABAQUS

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I am looking for an explanation about the formulation used for CONTINUMM SHELL elements in ABAQUS.

Modelling cyclic behaviour of soil using UMAT

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I have been trying to model the cyclic behaviour of soil. I got a UMAT. But when I'm using UMAT, it is creating lot many errors (like numerical singularity and excessive distortion). I have constrained it properly. I tried running my model with an inbuilt material (clay plasticity) and I'm getting results. Here I'm not even able to move from the initial geostatic step. Can anyone please help

renganathan sekar's picture

Is it possible to import a FE Assembly to SIMPACK?

In ABAQUS, I have modelled a assembly containing two parts with lot of constraints and other engineering features which are very crucial to my FE analysis. The job ran successfully and I have got satisfactory results. As a next step, I would like to import this model into the Multi Body Software SIMPACK as a flexible body. This would require the introduction of substructuring concepts and I referred to SIMPACK tutorials for exact way of doing it. My question is, can we import an assembly into SIMPACK. Because the tutorials explain only a part being impoted into SIMPACK.

Write out local material orientation

I have a vibration problem where I have assigned the local material orientation by assigning points a and b. By assigning points a and b, I define one material direction in my local coordinate system - direction 3. From Abaqus documentation, I understand that the other two directions are assigned to be orthogonal to the 3rd direction but are set somewhat arbitrarily. I want to write out the directions so that I know the three vectors defining all three directions of the local material orientation.

I found that I can write out the local orientation averaged at each node by using: 

Write out local material orientation

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I have set up a vibration problem. I assign a local material orientation by assigning coordinates a and b to define the 3rd material direction. From documentation, I understand that the other two directions are assigned to be orthotropic to the 3rd direction. Beyond that, I think that they are set somewhat arbitrarily. I want to output each component of the local material orientation.

How to link gfortran with Abaqus6.14 ?

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Dear Abaqus Experts:


I am new Subroutine user and I want to analyze plastic deformation behavior of micro component.

So, I have to link Abaqus,gfortran,and Microsoft Visual Studio.

I tried several methods by reference to the following link,but I have not yet been successful in them.

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