User login

You are here


software of interest to mechanicians

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

Choose a channel featured in the header of iMechanica: 

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

strains from the given Displacements with given X Y values by Radial Basis Function Thin Plate Spline in MATLAB

Dear Researchers 

I have attach a text file with this message in which I have written all my code. I have applied the Radial Basis Function (interpolation) to find approximated displacements.

f = RBF(r)*a

f = given values e-g displacements to be approximate

RBF(r)= Radal Basis function (Thin Plate spline)

a= Radial Basis Function coefficient

X= x distance from the origin (given) (first column of disppoints)

Y= y distance from the origin (given)(second column of disppoints) For example as below

X    Y    f(U)

1    5    4

(ABAQUS CAE) piezoelectric analysis


I'm doing piezoelectric analysis using abaqus CAE v6.12.

Specifically, what I'm doing now is to make the bimorph piezoelectric harvester model using Abaqus CAE

and to validate my model.

My FE model is made based on the model developed by A Erturk and D J Inman in their paper,

'An experimentally validated bimorph cantilever model for piezoelectric energy harvesting from base excitations'

They presented the analytical solution for voltage output and experimental validation is also presented in this paper.

Thermo-mechanical analysis ( Heat transfer due to radiation and convection)

I know you place tremendous value on your time so I’ll be brief.
I am trying to do a thermo-mechanical analysis of a closed region (H=75cm). In this region, at the bottom, the Temperature is around 700 degree. A structural beam is placed at the height of 25 cm from the bottom surface in closed region.
I want to simulate the heat transfer from the bottom surface to beam due to convection (because air is there as a medium in closed region) and radiation.

How do you solve the system error code 1073741819 in Abaqus 6.12?

Choose a channel featured in the header of iMechanica: 

Hi I am getting this error message while running a UELMAT:

Webinar: Tips & Trips When Working with Simpleware ScanIP, Feb 10 2016

ScanIP Webinar

Looking to increase your productivity with the ScanIP software suite? Join this webinar to learn how to unlock the full potential of the software. Regardless of your engineering field, you will leave with new skills that will help you work faster and more efficiently in ScanIP.

Attend this webinar to learn some of the most effective tips and tricks used by the application engineers at Simpleware. A range of topics will be covered, including:

How to model hybrid composite in ABAQUS?

Choose a channel featured in the header of iMechanica: 

Hello everyone,

Merge mesh in Abaqus

Hi I tried to mesh these two plates with two cases having different geometries. I am trying to achieve something similar in complex geometry in abaqus. But I think the problem is with shapes or if it is something else, please help me with this. I tried in solid elements too it did not work either. I have attached image where you can see two cases 

Please see the attached file for detailed view

Simpleware Case Study: Homogenisation of the Material Properties of Multi-Phase Materials

Simpleware Double Precision Shell

Modelling large structures containing multiple phases over much shorter length scales is often very difficult. Learn how Double Precision Consultancy in the UK solved this problem using Simpleware software when analysing a Mussel shell acquired using X-ray tomography.


How do i add a reinforcement beam to a door of a car at the front using the ls dyna contact card CONSTRAINED_RIGID_BODY ?


Subscribe to RSS - software

Recent comments

More comments


Subscribe to Syndicate