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Enterfea
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Добавлен 1 апр 2016
In this channel Enterfea will post videos featured at our blog (www.enterfea.com)
PIN Connection in FEA: Case Study
Join my FEA Newsletter here: enterfea.com/fea-newsletter/?src=yto
In this video, I showcase a PIN Connection Case Study. We will not only analyze the Nonlinear FEA outcomes but also compare those with the capacities calculated according to the code EN 1993-1-8.
Please enjoy!
In this video, I showcase a PIN Connection Case Study. We will not only analyze the Nonlinear FEA outcomes but also compare those with the capacities calculated according to the code EN 1993-1-8.
Please enjoy!
Просмотров: 5 157
Видео
FEA theory - Do you need it in practical design?
Просмотров 3,4 тыс.Год назад
The importance of FEA theory in practical design in my discussion with Marco Nawijn allowed us to dive deep into what you need to be a good designer and what to pay attention to when learning FEA. 0:00:00 - Welcome 0:00:56 - Marco's Experience / Background 0:06:00 - Importance of Laboratory Test Benchmarking 0:09:00 - Practical importance of Mathematics 0:13:18 - Conclusions as a substitute for...
Nonlinear FEA: Pros, Cons and how to convince someone that it really works!
Просмотров 2,6 тыс.2 года назад
You can learn here, about the pros and cons of Nonlinear FEA, as well as how to convince your boss or customer that this approach really makes sense! If you want to learn more about nonlinear FEA, you should really read this: enterfea.com/how-to-tackle-nonlinear-finite-element-analysis/
Ph.D. in Engineering - is it worth it?
Просмотров 2,9 тыс.2 года назад
In this video, together with Manuel Ramsaier, we'll talk about our experiences with doing and having a Ph.D. in engineering. Be ready for a ton of fun, and quite a few surprises :) If you would like to learn FEA from me, check out my free FEA course: enterfea.com/10xFEA/ You can find Manuel's channel here: ruclips.net/user/ManuelRamsaier
Topology Optimization and FEA
Просмотров 8 тыс.3 года назад
In this video, I will discuss all you need to know about Topology Optimization with my guest Ph.D. Eng. Manuel Ramsaier. Definitely, check out Manuel's RUclips channel: ruclips.net/channel/UCU3fA_a9XScLscMwCOBtRiw Conversation topics: 0:00:00 - Start 0:01:00 - How did you start with Topology Optimization 0:05:20 - What is Topology Optimization 0:11:20 - How Topology Optimization is applied to r...
Correct Mesh Size - A Quick Mesh Convergence Tutorial
Просмотров 16 тыс.3 года назад
Selecting a proper size of Finite Elements in your analysis is a pretty important task in FEA! In this video, you will learn how to do it properly! My FREE FEA Online course: enterfea.com/10xFEA/ Post about stress singularity: enterfea.com/stress-singularity-an-honest-discussion/ You can learn more about FEA on my blog: enterfea.com/blog/
Nonlinear FEA in shell design
Просмотров 6 тыс.4 года назад
My free FEA online course: enterfea.com/10xfea/ My blog: enterfea.com/blog/ This is a voiceover I did for my presentation at an engineering conference. You can find an original video in Polish here: ruclips.net/video/Z9o3gS0z6iI/видео.html
Nieliniowe analizy MES w praktyce: projektowanie kosntrukcji powłokowych
Просмотров 2,1 тыс.4 года назад
For English version go here: ruclips.net/video/uBjfnxNcwIc/видео.html Mój blog o MES: enterfea.com/blog/ Darmowy kurs MES online (po angielsku): enterfea.com/10xfea/
Bolt Preload in FEA Guide using Femap
Просмотров 12 тыс.4 года назад
Bolt Preload in FEA Guide using Femap
Problem z analizą wyboczeniową konstrukcji stalowych
Просмотров 4,1 тыс.5 лет назад
Problem z analizą wyboczeniową konstrukcji stalowych
Issue in stability analysis of steel structures with FEA
Просмотров 3,1 тыс.5 лет назад
Issue in stability analysis of steel structures with FEA
Starting in FEA, Career advice and engine design!
Просмотров 2,9 тыс.5 лет назад
Starting in FEA, Career advice and engine design!
Nonlinear support with gap elements in Femap
Просмотров 7 тыс.6 лет назад
Nonlinear support with gap elements in Femap
Nonlinear FEA: Snap-through problem!
Просмотров 10 тыс.6 лет назад
Nonlinear FEA: Snap-through problem!
What software for FEA and how to choose it?
Просмотров 5 тыс.6 лет назад
What software for FEA and how to choose it?
Time pressure in engineering and how to deal with it
Просмотров 1,4 тыс.6 лет назад
Time pressure in engineering and how to deal with it
Analysis types in FEA: Beyond linear static
Просмотров 5 тыс.6 лет назад
Analysis types in FEA: Beyond linear static
Boundary conditions influence on static design - case study
Просмотров 4 тыс.7 лет назад
Boundary conditions influence on static design - case study
How to calculate critical bending moment
Просмотров 7 тыс.7 лет назад
How to calculate critical bending moment
Subcase - your best friend in speeding up analysis in Femap with NX Nastran!
Просмотров 3,9 тыс.8 лет назад
Subcase - your best friend in speeding up analysis in Femap with NX Nastran!
10:00 If this example were tension (uniform surface load, applied to the free end) instead of transverse load, then would a single Quad4 element give the perfect answer? Again, assuming a Poisson's ratio of 0.
Your enthusiasm in the live demo made it even more interesting... I loved watching two PhDs, trying to interpret the 'rebellious' results coz of one element
Thanks :)
48:13 What a cruel act, to use such vocabulary with a Pole. I've heard "spurious" fewer than 5 times in my life.
I definitely learned something there :)
Hi, Lukasz, this is one great explanation. I have one question with regardless to plastic theory. I am reading your enterfea blog, and I know that you are using Rfem software, and I want to compare Von Misses plasticity implemented in Rfem and for example Adina or Abaqus . I am not talking about large strain plasticity (probably this is not implemented in rfem). In Abaqus or Adina Von Misses plasticity is followed by FLOW RULE and YIELD FUNCTION, but, what about rfem is it the same math or something else, maybe simpler?
I think you should also compare the displacements. The quad4 presents a locking behavior that you are not looking in your examples.
Hello! :) Please, could you tell me, how to make this example in SolidWorks ? I need help with the fixtures, connections. I mean, what is the contact interaction between the components and which degrees of freedom are removed to be model stable.
As an Economics Graduate i say YES. I am nowv studying Mechanical Engineering so if one gets this Joke, place a thumbs up 😂. Economist abuse Math 😂
thanks for this incredible video i have a question , why there is second mode and third mode of buckling while it's supposed to collapse at first mode of buckling ?
In Linear Buckling it's just a "math operation" - you can calculate something akin to "what would be a second mode, if the first one would not exist" etc. In nonlinear FEA, you can't do that - the structure will fail into the first mode, and there isn't much you can do to obtain a second one (apart from applying load very fast in some cases, but that is beyond static analysis :) )
Hej Łukasz. Could you start your videos with a brief description of boundary conditions applied? As for this example - when there are nonlinear contacts involved and there's seemingly nothing that stabilises the model (model is not fully constrained, contacts are not 'bonded') is it 100% reqquired to explicitly use "soft springs" / "rigid body motion" or whatever this may be called in other software? Or based on contact types do some packages like ANSYS or FEMAP somehow resolve it in a different way or automatically? I'm asking since an analyst in my company (ansys) said he doesn't have to apply soft springs, ansys just moves on on its way and frictional contacts stabilise the model. In theory empty places on stiffness diagonal are disallowed numerically...
Hey Mate! Thank you for the suggestion. I understand the need, and I will definitely make some videos about boundary conditions, but I don't want to make my videos "too long" so talking about everything in every video won't work I think :( To answer your question, I think I used soft springs in the model to stabilize the pin. You could also use the symmetry of the model to do that, but I don't like how the outcomes look (and it's important for the video) so I made a full model. Cheers!
@@Enterfea Symmetry wouldn't work in the vertical direction. I understand and actually applaude the need to keep things consise and to the point, but in the world of FEA boundary conditions are everything. You can't really judge the resulsts without knowing them and as this is a technical and study matrial I'm 100% sure no one would argue the videos are 20 seconds longer than they should, no need to always get into deep details :) By the way - great work as always, I'm nagging my boss to buy me your training course and I was happy to see some exmples of your analysis in Dominique Madier's book! Good read, just started it.
@@eartheartbaratheon791 Yea, this is always a thin line on what to talk about and what to ignore - but I totally see your point!
Hello, thanks a lot for this video. Very clear explanations! 😊 One question I have is what are the various methods for obtaining the averaged value? Also which is the "best" method? Thank you.
Hey Mate! Sorry it seems that I've missed your comment (?). There are many ways to average outcomes, and I think it's best to read the user manual simply to check how your FEA package does this. To be honest, I'm not 100% sure which method is the best (I mean, in Femap I have access to a few, but I'm sure there are a LOT more options in other programs as well). I wouldn't stress about it too much though. If you will read the manual, and know what your program is doing, you will simply know if a given method is decent at what you are trying to do. In the end, this should not "make or break" your analysis - especially when you're using nonlinear material :)
Waste of time
Thank you so much for the post. It is going to help many engineers. One suggestion to use screen pointer to indicate the exact location that you are referring to during your explanations.
Thanks for the suggestion Mate! I will see what I can do :)
unbelievable !!! this is the stuff i was looking for .....fantastic !!!
I'm really glad that you like it :)
wow wow wow..... great stuff
Thanks Mate :)
This was a very good explanation. Thank you.
You're very welcome!
Hello! I like a lot the way how you explain everything! :) May I ask what is the name of the software you used for the FEA ?
I'm mostly using Femap with NX Nastran
I NEED TO FIND DISPLACEMNT VALUE CAN YOU HELP ME FROM MY RESULTS OF BUCKLING ANALYSIS OF HELICAL SPRING.
Really amazing topic to go with. Can we get the Power point presentation slides.....
👋
Thank you for your talks
thank you for sharing with your experience
Thank you, Lukasz. What material behavior model did you use? (Bilinear or multilinear)
It was a bi-linear material model :)
I thought with a bilinear model, it is impossible to get a chart of the load capacity since the chart will always grow.
@@Archrussia it can fall down if you have a nonlinear geometry implemented in your model as well :)
interesting.
I'm glad that you like it :)
Superb explanation. Would love to have had this kind of professors at my university. Everybody just grasps ober the topic, like not even knowing it that deep. Sad.
Thanks Mate! I'm glad that you like this :)
Do you do CFD as well or just fea
I only do FEA, never worked in CFD
Thank you again Sir Lukasz for the result of your non linear analysis. It clearly shows 2 shear plane occurs per each Lug. This is very useful since there is no code gives clear guidelines whether 2 plane shear or single plane shear will be applied on pin-connected member. Therefore for this configuration where there is axial uniform load is applied 2 plane shear will be applicable..But what about if the load is not uniform when there is a out of plane load, especially occurs in Lifting Lugs where the sling with angle attached to the shackle, then pin shackle connected to the pin hole.. In this case load is not uniform, then single plane shear maybe more applicable for shearing stress?
Good pronunciation, escpecially RRRR
Hi I'm looking for an FEA software which has user friendly pre and post processing And ability to handle and mesh complex gemoetries which curvatures. Can you please suggest one
What is and is not "user friendly" heavily depends on personal preference I think. I remember that there were times when Femap irritated me non-stop, and now I really like it... so would that count as user-friendly? I don't know to be honest. That said, if you want to mesh complex 2D shapes (I mean, made form plate/shell elements) I definitely recommend Femap - I think it has one of the cooler meshers, with an awesome meshing toolbox that really allows you to control your mesh. For 3D elements, Femap isn't great I'm sure there are much better choices out there, but I rarely to such models, so I can't really recommend anything specific...
in minutes 8.10 ; what material model do you use to achieve negative slope like that? Why is there no strain hardening phase indicated in the graph?
Great 🎉 You got a new follower
Awesome :) Welcome onboard :)
Great video
Thank you! I'm glad that you like it :)
Thank you so much Sir Lukasz for sharing. This part of structure plays important role especially for heavy equipment and module lifting. Please allow me to ask my query. 1. What is the maximum von mises stress for Case-1 and Case-2. 2. Do we need to perform mesh convergence in this type. Since there is a changes in geometry like hole, there may be need to check mesh convergence? 3. Is plastic strain contour map you show for shear check can display from FEMAP, in addition to maximum von mises stress contour map? Just curious since I try to find out using STAAD, but i afraid there is no such thing plastic strain contour map. Thank you again for your sharing. Actually I almost near and close to decide to take masterclass but my remaining issue is if my software that I use is not capable to perform good output Non Linear Analysis, then it will be hard for me to follow all things. I am checking now the capability of STAAD in non linear analysis.
@@arocenajesussusmerano174 I'm glad that I could help you Mate!
Thanks for great session
Thank you for the valuable tips.
Of course Mate, I'm glad that you like the video :)
Great FEA session and insights into Non-Linear analysis using equilibrium paths and indicative failure modes. I just have a question: Where did you query the equilibrium paths for all the 3 cases ? Since you divide the max load capacity by the no. of shear planes (2 in pin shear case, 4 in plates' shear failure) and the no. of parts involved (2 in case of plates' contact failure), it's unclear to me how you select the query part/geometry/node/element/surface of interest or if you just selected the entire model (2 plates + pin) and then compare equivalently with the codes? Thanks for your time and answers!
Hey! Thanks for your kind words, I'm glad that you like the video :) I used the total vertical deformation of the top of the upper part (that I pulled) against the force I needed to pull it with. Hope this helps! Ł
Tension failure also for lugs with small widths
Sure, but I would have to still change the geometry to get that (assuming that I understand what you mean). If I have an "equal" amount of material on the "top" and on the "sides" of the pin (in the plate of course) then shear will always "win" simply because the area is the same, and shear capacity is divided by square root of 3. Still, you are absolutely right - if I had more material on the "shear area" and less on the sides, tension failure would be a thing - while I didn't want to make that case in the model I should have mentioned that in the video! Thanks for pointing this out!
Thank you for this very informative video. Which material behaviour did you use ( Bilinear,elastic-plastic or other) ?
I used an elastic - perfectly plastic material. In this application I didn't really needed anything more fancy, especially with typical "structural steel" being used, with a nice plastic plateau :)
We often neglect how powerful plastic strain plots can be.
Indeed, I feel that most of FEA revolves around von Mises plots (for better or worse).
I think not
VERY GOOD!
Thank you ;) I'm glad that you like it :)
In Mechanical Engineering, specialty in dynamics, a bolt without pre load is unthinkable. Talking about shear loads in bolts are not common either, they are supposed to make other parts transfer the load by friction. Very nice video, keep up with the good work
Thank you for the kind words. Well, in civil engineering non preloaded bolts would be a standard application. But of course, this depends on what you do etc. It's lovely how things are complex and how they differ from "field" to "field" isn't it. I simply love the complexity of engineering - this simply makes it so much fun to do!
Great video! Thank you :)
We helpful thanks a lot
I'm glad that you like it Mate :)
@@Enterfea Thanks for your reply. Actually I have one doubt. I want to know about linear gaps in nastran profile . Can you give any reference
@@suanarts6033 I'm not 100% sure if there is something like "linear GAP". I mean, the fact that there is a gap means that the problem is nonlinear, no? Anyway, it's usually just "define the rigidity" and then "define the gap", and not much more, so this should be easy to set up I think - it's almost like a linear spring... but with a gap :)
sensivity analysis is the answer for all these questions
Very good, I was looking for how to mix plate with solid elements!
Thanks Mate! I'm glad that you found this useful :)
My key concern with singularities is as following: if the stress result provided by my FEA in an inside sharp corner is wrong due to a singularity and this is confirmed by the results diverging as the mesh is refined, how do I find out what the real stress is?
Well... this is a tricky thing, because a perfectly sharp inside corner is not a good idea in the first place. I mean, if the region is not that stresses, you don't have fatigue and all that, this may work, but usually you should make some sort of rounded corner, simply not to concentrate stresses (this is a real thing after all). So if you worry about a given spot, then doing a rounded corner makes sense.
thank you!!!
Excellent video presentation. I wanted to ask you how I can develop that example manually since I have problems when performing the material nonlinear matrix and geometric nonlinear matrix. If you could explain with a video I would be infinitely grateful. Regards
I'm really glad that you like in Manu. To be honest with you, I have absolutely no idea how to do this manually... I mean, this is why you want to have a nonlinear solver in the first place, right? I can only imagine that doing this "by hand" would be super tedious and iterative... if I recall there were around 500 iterations when I was computing that. It's a super small model, so it took my PC a few minutes max to compute this... but doing that manually... I can't even imagine that. And if you would like to code a nonlinear solver of your own, that is a complex thing I guess - I never tried it, so I won't be able to help you with this.
Thumb Rule of 15% is something I am going to remember till death