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software of interest to mechanicians

Webinar: AI Medical Image Segmentation with Simpleware Software: A Solutions Overview

Synopsys are running a webinar this month on using AI medical image segmentation in Simpleware software to scale-up patient-specific workflows, save time, and free up staff resources. Highly recommended if you haven't yet had a chance to review the tools in Simpleware software.

Register here:

Webinar: Simpleware T-2022.03 Release: Highlights of New and Improved Features

Synopsys are running a webinar this month on highlights of the Simpleware T-2022.03 release, including new anatomies for its AI segmentation tools, 2D contour measurements, and improved 3D printing workflows. Learn more and register at:

Webinar on Using AI for Manual CT Inspection of Turbine Blades, Mar 2nd 2022

The Simpleware Product Group at Synopsys are running a webinar on March 2nd on using AI solutions to lift the burden of manual CT inspections for turbine blades.

To learn more and register, please see

ebarbero's picture

Executing Abaqus from Scilab

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I have managed to adjust a material property to get the best fit to the experimental response using fminsearch in MATLAB, but I lost access to free MATLAB so I have to use something else. I like Scilab, it works for everything I did with MATLAB except this. 


Scilab throughs and 'invalid handle' error when executing:

  dos('abaqus cae -nogui','-echo');

at the line inside



It seems that Scilab opens a dos shell to execute abaqus but '' has this line inside it:

Static Riks results for load vs angles , load vs lateral deflection and load vs vertical deflection

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I have differenet layups for cantilever beams. I run the static riks test from the eigen value in the first software ,giving values of initial arc increment of 0.005, mimumimum arc length increment as 1E-35 , maximum of 1000. The static riks gives good results for the notional loads for layup 30 -30 30 -30. However, keeping all other parameters same but for a different layup 30 -30 -30 30 ,the values from the staic riks are very very far from the experimental results.

ESB Webinar: How Simpleware processes patient-specific anatomies in orthopedics

Anyone looking for a quick introduction to patient-specific modelling for orthopedics should take a look at this new webinar coming out next Wednesday, December 1st, from the European Society of Biomechanics and Synopsys - details below:

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


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