Averaged and Unaveraged stress in FEA

[@Mekhify]

Mesh convergence. Principally, if in doubt do a mesh convergence check. Simplified: if doubling or halving (is that a word?) the mesh size at critical points does not chance results significantly, then you can most likely consider the mesh and results acceptable. When I was working with Ansys and LS-Dyna on jacket structures (offshore oil rigs) the standard criteria was 2% if I recall correct.

[@Enterfea]

Hey Jan! I completely agree :) Thank you for joining the discussion :)

[@jamesrayner8337]

You explain it so clearly and straight forward, I wish all explanations were like this. Thanks

[@Enterfea]

Thank you James! I'm really glad that you like my way of explaining things :)

[@gabrielsilveira5810]

You got a new subscriber! Thanks for the information shared! Hugs from Brazil

[@Enterfea]

Awesome! Thank you!

[@rodrigov7838]

Very explained! Thank you! Convergence mesh is a good option too.

[@Enterfea]

Thank you Rodrigo, I'm really glad that you liked the video :)

[@diegomendozafernandez3229]

Thank you so much for this video!

[@Enterfea]

Thank you Diego! I'm really glad that you like it!

[@GenaEnSamIAm]

Thank you very much for sharing your knowledge!!

[@Enterfea]

I'm glad that you found that useful Eugene :)

[@GenaEnSamIAm]

I really do. I am busy with a very large project that is the biggest in my career so far. I have had so many problems that I nearly want to give up engineering and do something simpler. I am so grateful I came across your channel. I will support you in any way I can 💪💪💪

[@Enterfea]

@@GenaEnSamIAm Thank you, this is so nice to hear :) If you could spread the word about my work, that would be an awesome help! Thank you in advance :)

[@aggelosstefanidis119]

Very nice video. I was confused with averaged and not stresses and you really helped organize my mind! Thanks!

[@Enterfea]

Thank you Aggelos! I'm really glad that you learned something useful here! All the best!

[@norimaruo2575]

Thank you so much for making this useful video!

[@Enterfea]

You're welcomed Nori! I'm glad that you found it useful :) All the best!

[@solboozyk4014]

Thanks Lukasz! I like your approach in teaching FEA. I can follow easily :)

[@Enterfea]

I'm really glad to hear that Solboo :) Thank you for the kind words :)

[@sudmudmud357]

wow wow wow..... great stuff

[@Enterfea]

Thanks Mate :)

[@Dad_Lyon]

First time I got to hear one of your videos, thank you sir!

[@Enterfea]

I'm glad that you like the video :)

[@ginoongboyong]

Thank you, sir Ł!!

[@Enterfea]

Thank you Darinel! I'm really glad that you like the video :)

[@teachyourself7374]

Hi Lukas, ı am very glad that ı discovered your lectures. Your teaching technique is quite effective. Best regards. Best wishes.

[@Enterfea]

Thanks :)

[@Tuffaha]

great explanation

[@Enterfea]

Thank you Sami, I'm glad that you like it :)

[@ilhantalih9949]

Very good explanations, thanks sir.

[@Enterfea]

Thank you, Ilhan! I'm glad that you like the video :)

[@KyTaPb]

Thanks for the video. Could you give a reference to the International Weld Institute publication that you talked about?

[@Enterfea]

Sure, it's IIW (International Institute of Welding) Recommendations for fatigue design of welded joints and components

[@MohammadZarghami11]

Thanks a lot for your great explanation

[@Enterfea]

Thank you for the kind comment, Mohammad! I'm really glad that you like the video :)

[@gouthamsridhar999]

Very Insight! Thanks for this :)

[@Enterfea]

My pleasure Hari! I'm glad that you like it :)

[@Rupsy85]

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.

[@Enterfea]

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 :)

[@sacovanloon2097]

nice video, as always. Thank you.

[@Enterfea]

Thank you Saco! So nice to hear that you liked it!

[@mehrdadbor3461]

Łukasz, great video, what are your thoughts on stress linearization where there are peak stresses?

[@Enterfea]

Thank you, Mehrdad! I'm glad that you like the video :) I'm not a big fan of stress linearization, and since I mostly do nonlinear FEA I don't have to dabble in this... I understand the concept of course, but this would not be my default approach. I would simply use nonlinear material properties and check plastic strains instead...

[@JousefM]

1 hour too late, damnit! Enjoying it now :D

[@Enterfea]

Glad to have you here Jousef :)

[@ionstefan8402]

Sir, I m an industrial engineer(I have studied industrial design) not a mechanical engineer but I have studied FEA in the university,strength of the materials,and other basic engineering stuff.From your oppinion can an Industrial engineer work in this field or is it allowed for an industrial engineer to work on this field ?Thank you in advance!

[@Enterfea]

Hey Ion! I'm terribly sorry I didn't reply sooner. I must have missed a notification about your comment! To answer your question, I strongly believe, that if I will be "good enough" with FEA, strength of materials etc. I will be able to cooperate with NASA as an expert (haven't even reach out to them yet, so this can be a painful dissapointment in the end, but I do believe that based on zero facts!). On the same note, if you would be good enough in what I do, I'm not so sure if I would actually check your "formal education". Sure, in the "first screening" perhaps that would be it... so it may be hard to land an interview in a big company. But in a smaller one like mine? I don't think this is what matters most. It's the character and skills that "count". There are however rules in different countries on who "is allowed" to do what. I.e. here in Poland you actually need to finish civil engineering and pass a "national exam" to be "allowed" to design buildings. But there are no limitations on FEA design of various other things. Perhaps... there will be such limitations in future - I don't know. So it's not entirely obvious how limiting this is, I would guess that skills and character are deciding, and I'm certain that if you are "good enough" folks who want to work with you will "find a way" to do that. But starting... that is a different thing, and since I almost always had my own company, I'm not the best person to give you advice in this field I'm afriad :( Maybe it would be a good idea to call a few FEA companies near you, and simply ask folks working there? They should be more than happy to help you out! All the best! Ł

[@ionstefan8402]

@@Enterfea Thank you for your answer. I'm glad to find out that you are from an eastern european country like me, I'm from Romania.Is quite hard to find here Jobs în this field because Romania relies more on production than concept of product and it's very frustratig to find a job in these medical circumstances.I think already have passed 8-9 months since I have uploaded my CV but no result have shown, just one interview but not on Fea Field because are few companies which are doing this. Most of The Projects that I have made in fea are just let's say,, experiments'' (made from my curiosity and passsion) based on what I have learned about strength of materials and other stuff like this but I have never had the oportunity to work with a specialist that can guide me in this field.

[@Enterfea]

@@ionstefan8402 I think we should divide "working with specialists" and "working in companies that do FEA". Sadly, this is not the same thing, and reports I get from time to time from my Customers to "validate" clearly shows that. Sadly, it's very hard to find people who are good enough in FEA to call them "specialists". But this is not a "special" thing of FEA - this is a fact of life. If you have a difficult thing people can do, only a few will be very specialized in it! I think that finding a job in FEA will be much easier than finding a job where some specialist will be able to guide you etc. For me, the road was through structural steel - I'm a civil engineer by trade, and I started simply by designing structural steel problems. Then, those became more difficult, at some point, few details required a more complex design approach (like FEA done on a connection, etc.). Then the problems became more demanding... and here I am a decade later running my company that does FEA... But this also means that I never searched for an "FEA job" so I don't think I can give you any pointers :(

[@eladherzog]

@@ionstefan8402 You do not need anyone to guide you,just start.First of all FEA or any other method like DEM or FVM isn't reserved only for mechanical engineers but also for mining engineers,problems in geology,slope stability,design checking and optimisation with some tools like mold flow or pam-stamp,autoform.etc..Im geology and mechanical engineer and I had the same topics during my study,same mechanics,started with failure theory,tresca,rankin,von mises etc.My problem was different and material but FEA and 90% of what I need to know is the same.For begining start with freelancing at least,meet new people and make connections,you need people around you.

[@ionstefan8402]

@@eladherzog As you mentioned in your last paragraph ''meet new people an make connections ,you need people around you.'''that 's what I m talking about.It is important to meet people who are working with FEA beacuse as you probably know every jobs hides some small details some small secrets if I can say which are very important and is important to have someone to ask for an advice.Even you know the theory the working experience in a field of enginnering as like any other job counts very much.

[@Tosinmoses]

Hi

[@Enterfea]

hi :)