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software of interest to mechanicians

Modeling finite number of mass/stiffness systems on an elastic media

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I have to model finite number of springs with point masses on a soil layer in Abaqus representing resonators. I tried to use Reference Points on the soil layer and some Reference point above the layer and connect them with Spring/Dashpots using connecting two nodes option, I chose Line of action for the spring, then I add stiffness. In the next step I applied Point mass as inertia to the reference points above the soil. 

How to call UEXTERNALDB subroutine

Hi, I'm new user of ABAQUS. I'm trying to develop a model that involve one further output variable (the degree of cure of a polymer). I thought to use the subroutine UEXTERNALDB to write and read from an external file the array containing the values of this output variable in each element. But I couldn’t find out how to call this subroutine in the .inp file. Does anyone have any suggestion for my problem?

Thank you

Cant solve "too many attempts made for this increment"-issue on some models

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Hello at all,


I have some serious issues with some of my models in Abaqus 6.14. I need to simulate shear failure to investigate the influence of concrete strength and fracture energy on the size effect. So far, everything went good. I calculated almost 100 models without any problem with exactly the same model (only materials changed). But: For the combination of concrete strength fck=50MPa and a fracture energy of Gf=60N/m or Gf=80N/m, the calculations will stop after a short time although the .odb file shows only some minor bending cracks in the beam

Simpleware Intro & Live Demo - Materials Characterisation and Reverse Engineering, Rotherham, UK, June 27

Date: Monday, June 27, 2016

Time: 12:00 pm - 2:00 pm

Location: AMP Technology Centre, Advanced Manufacturing Park, Brunel Way, Rotherham, UK 

Who should attend

Abaqus Python creating a surface set in a loop

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Dear friends

I'm modelling a large penetration of a strip footing in clay soil. I'm using a Python script (Abaqus 6.13) for this.

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

Simpleware UK Workshops, June 27-June 29 2016

Simpleware software


We're running a series of free workshops at the AMP Technology Centre in Rotherham (June 27th), the University of Liverpool (June 28th) and the University of Leeds (June 29th) this month, where we'll be explaining the benefits of Simpleware for working with 3D image data.

vacary's picture

Siconos 4.0.0 is out !!

Dear Colleagues,

A brand new Siconos 4.0.0 is out !! Siconos is now distributed under Apache 2.0 license.

What is Siconos ?

Siconos is an open-source scientific software primarily targeted at modeling and simulating nonsmooth dynamical systems in C++ and in Python:

 + Mechanical systems (rigid or solid) with unilateral contact and Coulomb friction and impact (nonsmooth mechanics, contact dynamics, multibody systems dynamics or granular materials).

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

Webinar: Human Body Models from Simpleware, June 1st 2016

Human Body Models from Simpleware


Wednesday, June 1, 2016 

This webinar is offered several times. Select the time that works best for you.

Constraints in a Soil-Structure interaction

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Hello everyone,

I am trying to model the SSI in 2D plane strain. When I am modelling the soil+footing exclusively, there is no problem. 

However, when I want to introduce a pier [beam element] with a lumped mass on top of it, I cannot get the constraints right.

The soil is a deformable 2D plane strain body, the footing is declared as rigid body with a RP in the middle. The pier is a beam element whilst the lumped mass is a simple mass element [inertia/mass].


Hi.thank you for usefull site.i can not download modified digital image correlation matlab Mfile.pleas send this Mfile to my email address you help me?

Simpleware workshop at ETH Zurich, May 11 2016

Introduction and Live Demo: 3D Image Visualisation, Analysis and Model Generation with Simpleware

Date: Wednesday, May 11, 2016

Time: 9:00 am - 12:00 pm

Location: Swiss Federal Institute of Technology Zurich (ETH), Building ETZ, Gloriastrasse 35, Zurich, Switzerland

Who should attend

Simulation of surfaces interaction in 2d model in Abaqus

Dear Subscribers 

I am a new abacus user and I am trying to simulate the interaction between two

the surfaces of 2 different parts and materials. Does anybody knows how can I proceed 

in this simulation procedure. With pleasure any answer will be helpful from my work.

Thank you in advance

How can I use acoustic or ALE model in Abaqus?




Pu Zhang's picture

Remarks on UMAT for plane stress problem

There are a lot of sample UMAT subroutines for plane strain or 3D problems. However, it is difficult to find an example for the plane stress problem online. Even the UMAT manual does not provide enough information. I have tried the UMAT subroutine for the plane stress problem for a while. The following remarks may be useful for collegues who have interest.

1. The stress components σ11, σ22, σ12 should be returned to UMAT.  The other three stress components equal to zero, known as the basic assumption of the plane stress problem.

how can i model a BRB Brace in abaqus

hi every body

I model a brb(Buckling restrained brace) in Abaqus but my question is How to put concrete in a brb or How do I define the concrete inside the brb that work together? i use tie constraint But there isn't any stress for concrete! 
i use static,General for analysis! is it correct? 

Lunch & Learn Seminar with Simpleware and SIMULIA, April 27 2016

Date: Wednesday, April 27, 2016

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

Troubles with ABAQUS subroutine compiler after update of Visual Studio 2015

I always use "Microsoft Visual Studio 11.0" and "Intel\Composer XE 2011 SP1" to apply all the user subroutines.

Recently, the university administrator updated the Visual Studio to 2105 (14.0) on my lab computer. 

When I tried to run an OLD simulation which WORKED perfectly before, it returned me the error message below:


Begin Linking Abaqus/Standard User Subroutines

   Creating library standardU.lib and object standardU.exp


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