Choosing FEA software and good options you want to have in it!

A few days ago Josh sent me an email with a question about choosing FEA software. And I realized I've never actually written about it. Time to fix it I guess : ) But since I'm experimenting with videos (let me know what you think!) I've made this one about it: https://www.youtube.com/watch?v=Gq0YFTQuVL8 There are different [...]

Choosing FEA software and good options you want to have in it!

Flow Chart: Do I need nonlinear material?

Download the printer-friendly version here, and read the user guide below! Last time I've shown you the way to answer a question: do I need nonlinear geometry? Today we will tackle nonlinear material. In the beginning, I need to confess, that I do mostly FEA about steel and other metals. This means that some nonlinear [...]

Flow Chart: Do I need nonlinear material?

Flow Chart: Do I need nonlinear geometry?

Download the printer-friendly version here, and read the user guide below! I've already written a post on ignoring nonlinear geometry. This time I want to go way deeper into the subject. In the end, I want to create for you a simple Nonlinear Flow Chart that will help you to decide whether you need any [...]

Flow Chart: Do I need nonlinear geometry?

Different types of analysis in FEA: beyond linear static!

https://youtu.be/inVGiGzmii0 As promised in the video, you can get my free online courses below: Free FEA essentials course!   Free nonlinear FEA course! Different types of analysis in FEA (text) Just so you know: this will take around 15 min to read. As I wrote recently this year I want to help you gain confidence [...]

Different types of analysis in FEA: beyond linear static!

Stress singularity – an honest discussion

Arjen asked me recently about stress singularity. There are quite a few articles about this issue already (it is a common problem I think). But I want to bring something to the discussion as well : ) Stress singularity basics I'm sure you have heard about it, so I will be brief. Stress singularity is [...]

Stress singularity – an honest discussion

Do you need to know math behind FEA?

Recently I asked a lot of my subscribers what they think is the most difficult thing in FEA. While "interpreting results" or "too much theory in materials" appeared quite often, I also got several answers like: My biggest obstacle is actually understanding the mathematical concept behind it. Although I am really interested in the application [...]

Do you need to know math behind FEA?

Design for stress, strain or rigidity?

This topic was on my mind (and on my to-write list) for a very long time. Finally, I had the time to organize what I want to write about it in my head. I wonder what is your take on this matter - be sure to leave a comment below! What does it mean to [...]

Design for stress, strain or rigidity?

Few thoughts on FEA projects

This is a very special day for me, as I just launched a first paid online course on Enterfea. It took me more than half a year to make it, so naturally, I started reflecting on that process. I realized that there are a LOT of similarities between making something like an online course and an [...]

Few thoughts on FEA projects

Few thoughts on meshing

Recently I've checked what topics are the most popular on my blog and it seems meshing is in high demand ( : I also figured I will try something different as a style of writing. This post will be a list of few short ideas instead of a long article about something. Let me know [...]

Few thoughts on meshing

FEA results verification with hand calculations: stability

Last time I described 5 steps to FEA results verification. Among those steps were FEA results verification with hand calculations. I figured it makes sense to expand on this idea. Especially since Luke asked me about something on this topic via email. Luke asks: How is the eigenvalue calculated, can this be done longhand? Can [...]

FEA results verification with hand calculations: stability

5 steps of FEA results verification

Whatever we design life will verify it at the end... but I would rather know if my design has a fighting chance before any major collapse occurs! This is why FEA results verification is a very important thing. When you are solving a known problem (i.e. as a benchmark) this is easy to do. You [...]

5 steps of FEA results verification

Nonlinear supports in FEA: Gap Elements (NX Nastran) [Q&A #2]

Recently I got a great question from Ardalan (thanks for writing mate!) about defining nonlinear supports in FEA. I think he does a better job of defining the problem: First how to constraint an entity with in tolerance rather than completely fixing it? i.e. how to define a certain range of motion for an entity [...]

Nonlinear supports in FEA: Gap Elements (NX Nastran) [Q&A #2]

Buckling length in sway and non-sway structures

One of the few difficult things about buckling lengths is, that you need to know if your structure is a "sway" structure or a "non-sway" structure. Commonly the simple check is made with displacements, but unfortunately, it may lead to serious mistakes! Why should you care about sway and non-sway system Firstly, I want to [...]

Buckling length in sway and non-sway structures

Symmetry in FEA may be dangerous

Symmetry in FEA is great, as it reduces the size of the task. This, in turn, shortens the computing time. Computing time is still a big issue, especially when you run complex models. Without a doubt, this is why using symmetry in FEA is so popular. There is a catch to this, however, as you [...]

Symmetry in FEA may be dangerous

When to ignore contact in FEA?

Linear FEA calculations are the most common type of static analysis done with finite elements. So far we have discussed when it is safe to ignore material nonlinearity and when to ignore geometric nonlinearity. Ignoring those aspects allow you to use linear analysis which is a simple yet robust tool. There is another thing we should [...]

When to ignore contact in FEA?

When to ignore geometric nonlinearity?

Linear FEA calculations are the most common type of static analysis done with finite elements. Last week we have discussed when it is safe to ignore material nonlinearity to use this simple yet robust tool. Today I will describe when we can safely ignore material nonlinearity. A short remainder There are several things you should [...]

When to ignore geometric nonlinearity?

When to ignore material nonlinearity?

Linear FEA calculations are the most common type of static analysis done with finite elements. There are a lot of benefits to the method itself, but of course, there are risks involved as well. Today you will learn when it is safe to ignore material nonlinearity. I will also tell you what things you should [...]

When to ignore material nonlinearity?

Load multiplier an ultimate FEA outcome

If you are starting with nonlinear FEA you most likely heard the term load multiplier. Usually, people associate this with some sort of "safety factor" but frankly this has nothing to do with safety. In fact, this is the only way you can get an outcome out of nonlinear analysis and today I will explain [...]

Load multiplier an ultimate FEA outcome

Changing active forces for enforced deformations and vice versa

I have seen many mistakes where people wrongly changed enforced deformations with active forces. In some cases, this is a simple task, which gives beginners the feeling that they can always do it easily. This, in turn, leads to various mistakes in analysis. I think it is worth discussing this, to point out common mistakes [...]

Changing active forces for enforced deformations and vice versa

Solve issues with nonlinear analysis convergence!

Lately, I got several emails with questions about nonlinear analysis convergence. There are a lot of reasons why your analysis could not converge. One of them is a wrong loads/increment strategy which I call "steering". Take a look at what are the possible options and what are the positive/negative aspects of each approach. Steering have [...]

Solve issues with nonlinear analysis convergence!