Linear FEA in stress design
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- čas přidán 6. 07. 2024
- Without a doubt, Linear FEA is the most popular tool in stress design. But is it accurate enough? What should you consider before using it? And most of all what you need to know to use it safely?
Learn more about FEA! Check my FREE online course: enterfea.com/10xfea/
Post where I select a Linear FEA outcome for a design: enterfea.com/web-under-local-... - Věda a technologie
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Thanks a lot Sir, it helps a lot, your explanation is so good that no teacher , or no person explain such detail like what you did. Im now a fan of yours.
Thank you, you are really kind Arocena :)
Friday night, a cup of tea, relax and fea. Perfect! 😃 Thank you Lukasz!
I can only envy you, Péter - my Friday night include kids jumping on me up and down as a form of relaxation :) But who knows, maybe one day!
I'm glad that you enjoy the show. See you around!
2:53
Walking the Ramberg Osborne line there, eh Lukasz? Thanks for the video!
I'm glad that you like the video Mate :)
Thanks Lukasz.
I'm so glad that you liked it Mahrez - thanks for commenting :)
Dzięki Łukasz, przy okazji szare eminencje wysile do angielskiego:) pierwsze kom, łapa up, i łaczing 😁
Thanks!
Thank you for the comment Mate! I'm glad that you enjoyed the show!
Your good knowledge sir
Thanks! I'm glad that you like the video :)
Good video.. whenever i try to do bolt connection with two plate it was showing displacement contact is too big by using surface to surface tangential behaviour friction coeff 0.2 and i apply preload to the bolt and gravity load .. same model if i use tie it work
Isn't tie contact like "glued contact" in Nastran? In such a case, it will work in most cases, but it's not ideal for solving bolted connections I guess. It's hard to give advice not knowing the problem, but I hope that you will the solution you are looking for!
Excellent video sir ..I am having one question ...if in my linear material model i am getting yielding at suppose bolt hole edge location of some flange and that stress is compressive then should i ignore that stress even if yielding spread is more ,just because that stress is compressive ..i am having constant loading which includes simple torque ..please guide
Hey Milind :) I've learned that it's hazardous to give simple "yes/no" answers to short questions about technical things. After all, I don't know how you modeled whatever you are doing, how it is meshed, and all that. Simply put - I have way too little data to understand your question in a way, that I could just say "yes" or "no". So you know... don't trust random folks on the internet (me included :) ). That all being said, if you have compressive stress between two plates, the bolt won't transfer that - the plate contact will... so depending on the modeling (perhaps you have the bolt modeled) it seems quite likely that this won't be a big issue. I mean, the contact stress between plates in a connection can reach yield - but this is unlikely to cause failure in "typical connections" since the elements attached to the endplate would fail first I would say. Still - I don't know how your model looks at al, so be careful about what I've written here - this is definitely not a "simple rule that always works" - as with everything in engineering - that will depend on the case!
All the best!
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In linear analysis while doing bolt model as a beam with spider connection iam getting more stresses on spider connected nodes should we consider it or not
Hey Venkatesh! Without seeing your model and playing around with it a bit I won't be able to give you an answer to such a specific question. As a rule, I believe that if you are not sure you can ignore something, DO NOT ignore it... it is a safe side assumption of course, but in engineering, you always want to be on the safe side.
And if you want to be sure... model the joint more accurately (with washers, contact and all that) do the nonlinear analysis, and check what the capacity is. Thank compare that to your linear FEA gig, do it for several connections and you will know how to proceed in such (and similar) cases.
All the best!
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Sir at 46.30 minutes of your presentation, stresses coming from different direction, such as compression in one side, compression on vertical direction, bending the other side, lateral load the other side, longitudinal the otherside, then magically combined this in one value let say 240MPa, then the uniaxial load of ductile material yield is 248MPa Fy of A36 steel..Can we conclude material is safe.? Apologize for my basic question, but it really helps a lot...
Hey! If by "magically combined" you mean von Mises stress, and the yield stress of the material is higher, than the material won't fail due to yield. "Safe" is a very big word, since you could easily have a case where something is at 60MPa of compressive stress (out of 235 yield) and still fails due to buckling, or fatigue etc. So, while stresses lower than yield show that the material won't fail due to yielding in a static case... this is still quite far from saying that the structure is "safe".
All the best!
Indeed thankyou so much Sir Lucasz for your wonderful explanation, im searching this answer for so many years finally I got for the answer. I should definitely follow you and even introduce to other.Many thanks....
@@arocenajesussusmerano174 Thanks - I'm really glad that I could help you :)