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software of interest to mechanicians

Webcast: Building a 3D Medical Device Ecosystem at Yale University: New Technologies and Opportunities

Synopsys are running a webcast with Dr. Daniel Wiznia of the Yale School of Medicine this November 2nd - it will cover how Simpleware software is used for personalized treatments being developed using different 3D clinical image analysis techniques, including 3D printing.

More details available here:

Webcast: Simpleware S-2021.06 Release: Highlights of New and Improved Features

If you're a user of Simpleware software, or want to know more about it, I recommend the new release webcast this week: Simpleware S-2021.06 Release: Highlights of New and Improved Features:

Here's what it'll cover:

likask's picture

MoFEM: School on Advanced Topics in Computational Mechanics (UKACM 2021)

Our presentations at the School on Advanced Topics in Computational Mechanics (part of the UK Association of Computational Mechanics 2021 Conference) are now available on the MoFEM YouTube channel (link).

Mogadalai Gururajan's picture

Eshelby solution: 2-D code for benchmarking

This is a C code based on Jaswon and Bhargava for 2-D solution for the Eshelby problem. Please feel free to write to me in case you find any errors. I am sharing this code under GNU GPL license. In order to upload the code, the file extension is given as txt. Once you download the code, remove the .txt and keep only the .c extension. The command

gcc JaswonBhargava.c -lm

will compile and give you the executable to run.

Webinar: Simpleware R-2021.03 Release: Highlights of New and Improved AI-Powered Tools

Check out this webinar on the AI-enabled segmentation and landmarking tools in the latest release of Simpleware software - ideal if working with orthopedic and cardiology medical image data and you want to speed up tedious segmentation.

Registration is here:


How to define the sink temperature and film coefficient in Abaqus?

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Hi, everyone. I am considering the heat conviction during compacting simulation by Abaqus. I was wondering that how to define the sink temperature and film coefficient? Is there any references for the two parameters of different materials?Thank you so much for your help in advance.Sincerely

Learn From the Experts Training With Simpleware

If you want to improve your knowledge of Simpleware software, Synopsys are running four interactive sessions this month - recommended if you want to catch up on image-based modelling.

30 mins each:

GetFEM: A high level multiphysics finite element framework

Dear mechanics community,

I would like to draw your attention to our recent publication about the opensource finite element framework GetFEM:

Anjali2's picture

Elmer FEM-OpenFOAM-Dakota: An open-source framework for data analytics, finite element and finite volume methods


A program for 3 way coupling between open-source software Elmer FEM, OpenFOAM and Dakota has been developed.

The program along with examples can be found here:


Capabilities: The interface provides an open-source framework that integrates data analytics, finite element and finite volume methods.

15 Minutes Webinar - How to Identify Part Defects with Image-Based Methods

Join us for this webinar on Wednesday, May 20th, where we'll be looking at methods for identifying part defacts using Simpleware software.

We'll look at an example of working with a machined simple hole plate (usually used for CT calibration) to focus on tools useful for Non-Destructive Testing (NDT) and the production of manufactured parts. We will show automated tools for segmentation and correction, as well as surface deviation, shape fitting and measurement tools. 

Learn more about how to take part in this webinar.

Webinar on Implant Selection and Positioning, Apr 29th, 2020

You are welcome to join this webinar on implant selection and positioning in Simpleware software. The 15-minute webinar shows some of the recent developments we've made in selecting and positioning CAD implants within computed tomography (CT) image data.

The webinar will look at the case of a CT torso scan to discuss different measurement techniques in Simpleware ScanIP, and how to create orthopedic models for 3D printing, Finite Element Analysis, and CAD.

Registration is available here.

Webinar on 3D Image-Based Reverse Engineering in Medical AM

You're invited to a webinar run by Synopsys Simpleware on April 22nd, where new trends in 3D image-based reverse engineering and medical additive manufacturing will be explored. The webinar will also look at a recent project with Nikon Metrology, Thornton Tomasetti, and 4WEB Medical.

You can find more information on how to join here

Question about wire model with beam element in ABAQUS

I want to do a finite element analysis of the braid vessel stent model with the B31 beam element and the explicit solver, and I find that the wires in the analysis are discontinuous. Should I add some constraints or cross-sectional connections?

I set the radial displacement of all the nodes, as usual the stent should be extended, but the result was not, and the lines became independent segments.

harshaastronaut's picture

NURBS patches (IGA) in LS-Dyna


I am trying to use iso-geometric elements in LS-Dyna with the keyword *ELEMENT_NURBS_SHELL_PATCH. The job manager terminates without mentioning where the errors are.

Can someone help me with this? A sample .k file using the above keyword will be helpful.

Thank you!


Harsha Reddy

ebarbero's picture

How do I count Keyword Blocks in the Abaqus input file?

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The Abaqus documentation, available here:

states the following:

Certain keywords must be used in conjunction with other keywords; forexample, the *ELASTIC and *DENSITY keywords must be used in conjunction with the *MATERIAL keyword. These related keywords must be grouped in a block in the input file; unrelated keywords cannot be specified within this block. 

ebarbero's picture

Abaqus nodes are missing degree of freedoms. ErrNodeMissingDofConstrDef

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Problem Description/Question: 

I model a cantilever beam with 2D plane stress elements. 

The left end of the beam is clampled (encastre).

In Step 1, I use a coupling constraint U2=coupled to apply a vertical load on the right (loaded) end of the model.

In Step 2, I use a different coupling constraint U1=coupled to apply a traction load on the loaded end of the model.

Each constrain is defined with different reference point, different surface, totally independent of each other. 

Rudraprasad Bhattacharyya's picture

Why getting trouble with Abaqus UMAT subroutine when using interaction features like contact or tie?

I am implementing a constitutive relation in UMAT subroutine using the commercial software Abaqus. First, I tested the UMAT subroutine with 'one element model' first. Then I tested with comparatively bigger geometry. It worked fine. Now when I am trying to do a models involving contact, i.e. use of the 'Interaction module'. I am getting error of over-constraint warning for 'Split Tension test of concrete cylinder'. The same input file (except the material definition) is running on Abaqus perfectly with Mohr-Coulomb criteria. I can see a reasonable stress and strain contour.

MMSLab-CNR's picture

NOSA-ITACA code 1.1c is now available

The new version of the code presents an improved and more intuitive
management of the subroutine and an easier use of Job monitor dialogue.
Enjoy it

MMSLab-CNR's picture

NOSA-ITACA code version 1.1b is now available

The improved version of NOSA-ITACA is now available at A more friendly monitor analysis has been implemented. Bugs related to card creation are now fixed. At you can find also some tutorials that will guide you through the use of the code. Enjoy !

Abaqus left eigenvalue and eigenvector

Dear all,


I am working on the subject of the instability problem using Abaqus. 

One of the representative examples may be the squeal noise. 


In the Abaqus simulation, we have the difficulty in obtaining the left eigenvectors. 


It seems that the following comments do not work properly to obtain the left eigenvectors. 


Does anyone know how to obtain the left eigenvectors in SIM?




jstello's picture

Ackward behavior in Abaqus

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Hello colleagues! 


I am facing a very strange phenomenon in Abaqus 2019. Setting up a transient consolidation analysis, and despite converging and showing job as complete, no output is written to the job at all. Needless to say, I am requesting standard field output every n=1 steps and the analysis is 10 increments or so. It's quite frustrating to see your mesh disappear when you expect to see nice colors. If this ever happened to you please do share how you went about it. 



MMSLab-CNR's picture

A nonlinear static analysis of a masonry church by NOSA-ITACA

The last tutorial (Tutorial4) about a non linear static analysis of a masonry church performed by the NOSA-ITACA code, is now available at We perform the analysis supposing the structure made of two masonry-like materials with zero tensile strength and bounded compressive strength and a linear elastic material.

MMSLab-CNR's picture

NOSA-ITACA code tutorials

Now at website

you can download tutorials where it is shown how to

perform modal analysis, linear static and non linear static analysis by NOSA-ITACA code. Enjoy them !

Otherwise you can watch them on YouTube at

MMSLab-CNR's picture

NOSA-ITACA code now runs on UBUNTU 18.04

Running NOSA on Ubuntu 18.04 is not (yet) officially supported, but you may use the package for Ubuntu 16.04, as indicated at

See also the prevoius post about it ! Enjoy !



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