During an interview I was once asked “You’re a mechanical engineer why did you get into programming?” My response was “I’m lazy and repetitive tasks are boring!” Some repetitive tasks do not lend them selves to automation, however, they are still boring and error prone as your mind wanders. This post details how creating a custom toolbar in Catia that can alleviate some of this tedium. These methods can be extrapolated to just about anything. For example I have a specific toolbox that I use when working on: mountain, road or now kids bikes.
Abaqus is itself a powerful tool for Finite Element Analysis, but coupling it with Dassault Systèmes Isight can open up new worlds of capabilities when it comes to design optimization. Isight is a system integration tool that is designed to execute other engineering software codes; providing inputs, executing models, parsing results, linking them into integrated
Being a perpetual early adopter of software updates we are already up and running Windows 10 on our server, laptops and even a Surface. The upgrades went without any issues and we have tested: Catia, Abaqus, Isight, Tosca and fe-safe with the DSLS (Dassault Systèms License Server) hosting the license files. One of our customers, Optimax Systems Inc has installed their DSLS on Windows 10 as well and provided their installation notes for DSLS and Abaqus. It’s great to have cool customers that are willing to help out!
While 3D printing has been widely embraced as a means of speeding up the product development process X-Ray 3D scanning has been somewhat less utilized, despite its tremendous usefulness. Part of the reason for this may be that while a 3D print can be held and touched the data files from CT scans are enormous
Introduction The purpose of this post is to explain how to utilize medical imaging data in the development of a prosthetic implant. The two most common medical imaging technologies are CT and MRI. Both export a stack of 2D grey scale images over a 3D domain in the standard Digital Imaging and Communications in Medicine (DICOM) format. In this post I will go through the development of geometric (CAD) and mechanical (FEA) models based off anatomical imaging data. Through this workflow designs can be tuned for specific biometry based on realistic loading scenarios. As always all of the models used to develop this post are available at the end of the article.
Topology optimization creates an organic geometry flowing material to where it is needed and eroding where it is not efficient. This technology is ideally suited to the limited manufacturing constraints that 3D printing offers. 3D printed parts by virtue of their layer by layer additive manufacturing approach have complex material properties. These properties are similar to wood where there is a stiff direction (with the grain) and a weak direction (across the grain). To gain the highest performance in 3D printed parts these material properties must be considered in the design process.
One of the most powerful features of Abaqus is that the GUI is essentially a command generator for python, which is itself a very powerful open source scripting language. Any action that you take in Abaqus CAE is recorded as a python script and these scripts are available to you to modify and execute at
One NASA adage is: Better, Faster, Cheaper…pick 2 The premise is that the third desire is mutually exclusive. This is obviously an oversimplification of the process however it quickly brings to light the interplay between goals. I like to think of design requirements from an optimization standpoint. There are constraints and goals. Constraints are those that the design must meet otherwise it is not a viable product. Goals are parameters that you would like to improve.
Interview related to this work https://www.youtube.com/watch?v=vGeig6tIvyU&feature=youtu.be Introduction In this post I will go through the methodology to perform topology optimization with Catia (CAD), Abaqus (FEA) and Tosca (Topology Optimization). Topology optimization evolves the geometry to remove unneeded material effectively minimizing weight. This is carried out by automatically scaling individual element’s density and stiffness based on the stress state of the previous simulation. This is an iterative process where material flows to regions to satisfy constraints and minimize the objective function. The created geometry represents the maximum allowable geometry and would be a heavy stiff head. High stiffness is desirable however weight is not. This will be the basis for the objective function of the optimization. The basic workflow is to create CAD geometry with the maximum allowable footprint. Create a standard FEA simulation. Create a topology optimization setting goals and constraints. You can download the files created in this article freely below.
Introduction In this post I will setup a simple parametric Catia model of a Pinewood Derby Car (PWD-C). All files are available for download at the end of the post including a PDF of the drawing template. The motivation to create this model are: Introduce basic Catia workflow Develop parametric CAD models with dynamically linked assemblies and drawings Quickly design with drawings automatically updated to trace with a band saw Introduce engineering tools to my son (*never too early to brainwash my minion*) In this post I’ll be going over: parts, assembly and drawing creation. Then shaping of the body will be performed using splines and style curves where you will see several designs created by Pete, my 7 year old son. (*No childhood memories were harmed in the making of this post. Aside from setting up the Catia model and running the band saw my 7 year old son Pete did all real the work.*)