CAE Tech Tips

Abaqus 2020 Mid-Year Update 3 Is Out

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We’re in the back half of the year, and Abaqus has received three updates on top of its yearly release, the latest having come out in May.  These updates are always worth at least reading about because they include plenty of bug fixes, performance improvements, and new features.  Anything in the release notes marked “2020 FDxx” is new since the original 2020 version.  Note the many enhancements to Abaqus/CAE, new GPU acceleration for Windows, and increased model size limits. Product […]

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5 Ways to Improve Your Abaqus Solve Speed

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The speed of your FEA calculations is a huge deal. It often dictates the pace of your engineering and the capacity of your entire business. Therefore, it is important to do everything you can to ensure Abaqus and any other CAE software are operating as fast as possible, so that you aren’t stuck waiting around — time is money! Here are a five tips to improve your solve speed, excerpted from our 20-minute webinar (with 20-minute Q&A), which you can […]

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Abaqus Convergence Problems: What Do I Do About Negative Eigenvalues?

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My simulation is not solving efficiently and diverges. I have negative eigenvalues in my message file, what does this mean? To answer this question, let us take a brief look at the finite element method. Your model is being turned into a representative stiffness that we call a stiffness matrix. These are the same matrices you studied a long time ago in math class. However, they have the possibility of having millions of entries as your model becomes large! The […]

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How Do You Get Your FEA Units Consistent?

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Unit choice and consistency is a topic that’s very near to a lot of engineers’ hearts.  We tend to have strong opinions about other people’s differing opinions on it, and when we find unit mistakes, they can be some of the most spectacular screw-ups in engineering history.  So how do we avoid embarrassing unit mismatches and surprise dimensional analysis?  With handy reference and clever calculator tools: Getting Consistent Units: A Helpful Table Abaqus has no built-in system of units. Therefore, […]

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What’s the Difference Between C3D10 and C3D10HS Elements?

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And When Do You Use One Over the Other? The C3D10 and C3D10HS are both 10 node tetrahedral elements in Abaqus with quadratic interpolation of displacement, otherwise colloquially referred to as “2nd order tets”. While the C3D10 is the standard or “vanilla” 2nd order tet element, C3D10HS is marketed as a 2nd order tet element with improved surface stress visualization. To understand how and why C3D10HS is different from C3D10, we need to quickly review how stress is calculated using […]

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Need Help Transitioning to CAE Work-From-Home?

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As the national response to COVID-19 ramps up, many CAE engineers find themselves having to work from home, which may be an unfamiliar situation. CATI has collected advice, tutorials, videos, contacts, and other resources to guide a smooth transition to a new working environment. We hope these resources help you get quickly up-and-running with Abaqus and the other SIMULIA products that are essential to your productivity. Please know that you can reach out to us at any time for assistance. […]

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How Do I Borrow Abaqus FLEXNet Licenses for Temporary Offline Work?

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If your Abaqus license is FLEXNet (as opposed to DSLS), you can “check out” licenses for a limited amount of time when you know you won’t be able to contact your license server for awhile. In order to borrow licenses in this fashion, SIMULIA requires a feature add-on (it’s free), which you can get by contacting your VAR. FLEXLM borrowing is done from a command prompt. Press Win+R and run the command “cmd” to summon a command prompt. From there: […]

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7 Ways to Make Smaller Abaqus ODB Files

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When you’re running Abaqus, the output files (.odb files in particular) can get really huge and out of control without proper attention. A lot of the default settings err on the side of caution and provide you output variables you’ll never look at, at time intervals you’re not interested in. Once these two factors multiply (especially if you have a lot of elements to begin with), your file size really balloons, which makes for slow file transfers and slow operation […]

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Abaqus/Explicit 2019 Now Supports C3D10 Tetrahedral Elements

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Abaqus/Explicit has long required second-order tetrahedral elements to be of the C3D10M (the ‘M’ stands for modified) element type. This has now changed — true second-order C3D10 elements are available! C3D10 elements in Abaqus/Explicit: Are true quadratic elements (“modified” elements are a special case of “numerical composite”) Are higher accuracy than their first-order, linear (C3D4) counterparts Are higher accuracy than their “modified” (C3D10M) counterparts Are recommended over C3D10M by Dassault Systèmes Have a bigger stable time increment than C3D10M Are […]

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Managing Your SIMULIA (Abaqus) FlexNet License

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Updating your SIMULIA license can be tricky. When you only touch it once a year, it’s easy to lose track of the license manager application or license file itself. This is the easiest way to activate that new license file that was just emailed to you. The license manager also lets you check the license status and/or pick a different license file location. We provide instructions below for that, too. Checking the license server status: 1. Click the Server Status […]

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