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Nozzle Shell Junction FEA Analysis USING ANSYS

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This video explains detail FE analysis of nozzle shell junction. It briefs about geometry creations as well as meshing of nozzle & shell. It explains loadings and boundary conditions applications using ansys like nozzle forces, internal pressure. In addition, explains, stress extraction and stress assessment though stress linearization, membrane stress & membrane plus bending stress evaluation.
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Опубликовано:

14 июн 2018

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Комментарии : 91

@sidibomma15 4 года назад

Really good examples for the understanding of ANSYS.

@graspengineering9249 4 года назад

Thank you ! You can also check below link, we started writing blogs. graspengineering.blogspot.com/2020/07/what-is-stress-linearization.html

@mrengineer7277 2 года назад

Dear sir, i feel grasp engineering is the best channel for ansys on youtube. Quality of content. Pure engineering channel

@graspengineering9249 2 года назад

Thank you for Appreciation !

@kaderkader8615 5 лет назад

Thanks a lot for these precious information I was struggling to find how can I create a fine mesh with the right elements

@graspengineering9249 5 лет назад

Welcome !

@sidibomma15 Год назад

Good explanation sir. Thank you.

@graspengineering9249 Год назад

Glad you liked it

@ManikMia 8 месяцев назад

Thanks for the video tutorial. Can I do this in LSDyna. I have pipes and tank models created in lsdyna and I want to connect them as you did. Could you please guide me. Thanks

@karankamalakannan651 4 года назад

Hi. Thanks for the wonderful video.I have one question. For calculating reaction forces, you have explained about the cancellation of nozzle forces applied for the first load step.Similarly, I need an explanation for validation of the pressure forces in the second load step.

@graspengineering9249 4 года назад

You can do hoop stress validation for pressure load case.

@darshanadeshara5483 2 года назад

Excellent

@graspengineering9249 2 года назад

Thank you so much 😀

@lazyhunk2 5 лет назад

Extremely informative Video. I have a question. How to check nozzle forces in operating case with temperature.? Thanks

@graspengineering9249 5 лет назад

Thank you for appriciation! If you are looking for reaction forces due to nozzle force, you can check from force reaction. Temp effect will not present in reaction.

@AM-of1hx 4 года назад

thanks a lot! very informative. I just have two Q's1) why for the other end of vessel you used fixed end while the other one you used pressure thrust! I assume both ends are having dished ends! 2) why you used negative pressure value for pressure thrust? many thx

@graspengineering9249 4 года назад

As we do not considered complete vessel and hence at both the openings vessel will move radially outward due to internal pressure. To compensate this effect we need to constraint both ends. But at constraint location it might show high stress and hence we had applied thrust pressure at opening at one end & one end is fixed as we need to constrained in FEA & Compensating pressure is applied in negative direction.

@mrigankanath3791 3 года назад

Thank you for the informative content. A question: Could we have gone for an half model or an axisymmetric model for this for less computation time/computer resource?

@graspengineering9249 3 года назад

Yes, you can do half symmetry but forces are not symmetric. It is better to consider full model if geometry is smaller and any un-symmetry either loads or geometry.

@mrigankanath3791 3 года назад

@@graspengineering9249 Thank you.

@viveksubramanyaprabhakar114 3 года назад

Thanks for the video. How does Ansys calculate these membrane, bending and peak stresses when stress linearization is applied. Do you have more information on stress linearization ?

@graspengineering9249 3 года назад

Thanks ! Please refer our blogpost for stress linearization (membrane, bending stress) : www.graspengineering.com/what-is-stress-linearization/

@mrengineer7277 2 года назад

Dear sir, you said that you will make video on fatigue analysis of pressure vessel after completing your blog. Sir i am waiting this video

@ibrahimelkebsi783 4 года назад

Good job mate I have a question When i used structure lattice in any body the meshing don't run in simulation static structural . What's the probleme?

@graspengineering9249 4 года назад

Thanks ! Brief exact problem ? Structure lattice in meshing ?

@hesambeigy9617 4 года назад

Hi Thanks for your good material. I have a question. Have you ever done Pressure vessel analysis by ANSYS workbench using shell surfaces (as opposed to solid bodies) and extract membrane and bending stresses directly? Have you done any study comparing those membrane and bending stress with the linearized ones? Cheers Hesam

@graspengineering9249 4 года назад

Yes...For shell bodies, you can do stress linearizartion through user defined function/ creating macros.

@aleksandardobric2791 2 года назад

It is called hot spot. In some codes is common.

@hiteshprajapati6299 4 года назад

Hi, very nice and informative video. Have you done any Y pipe analysis in ANSYS? If yes, can you post that video. I would like to do it based on ASME VIII DIV 2 part 5.

@graspengineering9249 4 года назад

You can do as same as present video. Create FEA Model, run the simulation for applied loads and then do stress assessment.

@trungnghiale8286 4 года назад

Thank you for your tutorial. I can't understand what is the compensating pressure and why we need to apply it on the limits. Could you pls explain more about this value ?

@graspengineering9249 4 года назад

In present video, the nozzle & cylinder have openings: In case of pressure vessel, when you apply internal pressure, at openings cylinder try to move radially outwards due to internal pressure, so in order to keep vessel in equilibrium, either you can close opening or else apply constrained, if both things are not possible then calculate the equivalent thrust pressure equating areas at opening. and then apply this thrust pressure (Compensating pressure) to make vessel in equilibrium.

@trungnghiale8286 4 года назад

@@graspengineering9249 thank you so much

@nemoscouts9178 5 лет назад

Hi sir . Your video is very informative. I wanted to know the ASME reference for minimum number of elements along the thickness .

@graspengineering9249 5 лет назад

Thank you ! You can refer stress classification general guidelines. It is generic to have min. 2-3 elements across thickness to capture the bending behavior.

@faizalk9005 4 года назад

Thank you for the video. I have a question. Your SCL 2, is it normal to the surface? It does seem to be going downward slightly.

@graspengineering9249 4 года назад

Welcome. SCL-2 is normal to inside & outside surface. It depends on how do you split & Also, SCL should pass through all the nodes.

@AM-of1hx 4 года назад

Than alot! I just need to know why do we need to define two load steps? What if we use one load step for nozzle loads as well as pressure (internal & nozzle loads). Practically they are applied simultaneously? Thanks again

@graspengineering9249 4 года назад

Yes You can apply both pressure and nozzle load in one step. It depends both might be simulataneously or will act one after another. Generally first vessel is pressurised and then nozzle loads will come. But designers always wanted to know effect of each step.

@navaneethv1709 2 месяца назад

If you apply Internal pressure and Nozzle loads simultaneously in FEA you will get lower stress due to the canceling effect. This is why codes have load combination cases. At the same time provide individual cases.

@EddickC2D 4 года назад

Good explanation but I wonder how to calculate properly this compensating pressure here, because there is just a quick view on excel and it is not explained what the number coming from. Would be nice to know it a bit more.

@graspengineering9249 4 года назад

Thank you. We explained is few videos about compensating pressure, we will further create separate videos for same.

@vahidamjadi9507 3 года назад

Thanks for your informative and valuable video.one question.can we trust ansys stress linearization results?i have modeled samples from PTB-3-2013,all my results Even equivalent VM match perfectly with what is indicated in the book except for linearized stresses.

@graspengineering9249 3 года назад

It should match. Linearized results are nothing but equivalent/ principal stresses only, which are calculated based on equations as same as membrane and bending equations (ASME). Refer ANSYS help for calculations details.

@vahidamjadi9507 3 года назад

Grasp Engineering tnx for reply.i think my problem was due to local stress concentration in few nodes.they produced high peak stress!

@maheshkulkarni2790 6 лет назад

nice mesh 😇

@graspengineering9249 4 года назад

Thank you !

@aleksandardobric2791 2 года назад

Nice video. Hmm…Can same slicing be done in spaceclaim? I have tried without sucsses.

@graspengineering9249 2 года назад

Yes, absolutely. Define plane or create surfaces same as DM and then do slicing.

@lostinlife5154 2 года назад

Thank you for such a nice explaination. I'm also working in PV analysis and nozzle qualification I want to ask that if I'm drawing SCL in the transition zone, crotch region of nozzle, how to classify stress in that SCL. Because it will consist both primary and secondary stresses. Please help in this matter.

@graspengineering9249 2 года назад

If it near discontinuity then it is no longer primary but local membrane stress. Please go through our blogpost: www.graspengineering.com/what-is-stress-linearization/

@sumanbiswas1003 9 месяцев назад

Hi @lostinlife, Hi, can I know where do you work? In my company only Sec VIII, dev 1 is used. I also want to do this type of analysis work. If impossible to disclose your company name publicly, please give your contact no or email id.

@TheSyahdi78 3 года назад

How do I proceed for meshing in case the sweepable body only the nozzle?

@graspengineering9249 3 года назад

You can define sizing method as sweep for sweepable body and define body sizing. You should get sweep mesh. Please refer our meshing video series, ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-avSUnSaOnsY.html

@mangeshbanale9741 4 года назад

How to classify allowable limit of PL + Pb as SpL (1.5 S) or Sps (3S).as per table 5.

@graspengineering9249 4 года назад

It is requirement from ASME. When you do stress linearization, you will get this membrane and bending stresses. Local membrane plus bending will get at discontinuity and it will be compared with SPL. We clearly explained all this topics in our live webinar session, if you have attended, your doubts might have cleared.

@benoyabraham4174 3 года назад

How would you suggest to analyse nozzle loads i.e. using Forces and moments in x,y,z 6 components ...when you are required to specify allowable nozzle loads for piping analysis...There are 6! Possible combinations that could be made

@graspengineering9249 3 года назад

You can apply the worst case loads. Consider the maximum force value and find out resultant. You can even apply in different load step and find the worst case scenario.

@benoyabraham4174 3 года назад

@@graspengineering9249 Thanks understand ur point but when there are multiple nozzles for which piping loads are available this could be a very time consuming and tedious process...first step would be segregation of loads sustained expansion and occasional...piping loads generally finalize at a later stage..routing and supports are also changing project to project...due to squeezing of layout..

@MrUlhasan 5 лет назад

Hi there, could you please send me the link or title of your design modellers video for the same geometry. I couldn’t find it. Many Thanks

@graspengineering9249 5 лет назад

The modelling of this model is not explained. You can ask for any difficulties if any while modelling. You can refer other offset nozzle modelling video with this link ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-_s9oB6hItp8.html

@mdzishan6403 4 года назад

How to create butt weld at nozzle shell junction in this model in ansys design moduler

@karanagrawal2154 5 лет назад

sir, can you please explain, why you have not created scl passing through max stress point.

@karanagrawal2154 5 лет назад

sir, it will also help me a lot if you can create a video explaining criteria's to be considering while creating scl like orientation of scl, location of scl etc. and thank you very much for creating and sharing such a informative in-depth video about stress internalization.

@graspengineering9249 5 лет назад

SCL should be taken at Max. Stress location, but it to preferred to take after fillet or chamfer portion, where SCL will come normal to inside and outside sections.

@karanagrawal2154 5 лет назад

@@graspengineering9249 thank you sir for your reply..

@adshah20 3 года назад

very informative video, I just have one question why have you taken 2 steps, the problem could have been solved with 1 step also. right ?

@graspengineering9249 3 года назад

Yes you can solve in single step too. But it is difficult to identify the cause of failure if any, so it is better to perform two separate steps also it is useful to verify the respective loads.

@soumikpal6464 3 года назад

Sir How to activate Auto Close Loop option During Edge Loop Slice

@graspengineering9249 3 года назад

Auto close loop option is available in older version. New version, it is missing so you need to create surface and then do slicing. Or else you Spaceclaim.

@arunsiddharth8307 3 года назад

Sir, why are we using solid elements instead of shell elements? Assuming this to be a thin cylinder, stress variation across thickness should almost be uniform in case of thin cylinder right ?

@graspengineering9249 3 года назад

You can use shell elements too. But stress linearization is difficult with shell elements, also need few assumption for welding connections . Hence better to go with solid element for such small geometry.

@nisargchauhan6595 5 лет назад

please post how to model(Draw) above assembly .

@graspengineering9249 5 лет назад

Please find more modelling videos in description. Refer our channel videos. #graspengineering

@parthpatel5227 5 лет назад

we want to get our project solution, that's why we want your help sir?

@graspengineering9249 5 лет назад

You can approach us on graspengineering@gmail.com

@parthpatel5227 5 лет назад

how can we contact you sir

@graspengineering9249 5 лет назад

You can approach us on graspengineering@gmail.com

@drury2d8 3 года назад

Looks like your compensating pressure values are wrong.

@graspengineering9249 3 года назад

Please Check whole video. CP is applied correctly.

@swagatambanerjee4102 4 года назад

Hello, this is Swagatam from Siemens. Although from a Piping Stress background, I have some questions pertaining to the stress intensification around the nozzle area. Can you provide me your contact email id ? With best regards.

@graspengineering9249 4 года назад

graspengineering@gmail.com

@mdzishan6617 4 года назад

how to create butt weld nozzle shell junction

@graspengineering9249 4 года назад

You can model 3D solid weld. If you have dimension then model accordingly or else you can assume approx. dimensions. But in most of butt weld modeling, their is no need to model you just need to (connect each node) connect nozzle and shell. If you are looking stresses at the weld, then simply extract the stresses at the junction. This might be the worst case scenario.

@mdzishan6403 4 года назад

Can you give whatsup or contact no.?

@mdzishan6403 4 года назад

Can u help me creation nozzle shell junction with v groove butt joint