Bolted Flange Gasket FEA Analysis Usign ANSYS Workbench

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Bolted Flange Gasket FEA Analysis Usign ANSYS Workbench

Рет қаралды 50,960

Күн бұрын

This video explains detail FE analysis of Bolted Joint. It briefs about how to apply loading conditions like pressure, bolt pretension using ANSYS Workbench. It explains gasket behavior with bonded and frictional contacts, etc. It also explains leakage possibilities and how to reduce it.
Note: Apply coefficient of friction as 0.1 instead of offset distance, which is applied incorrectly.
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Пікірлер: 75

@prakashchauhan8146 5 жыл бұрын

It is really a good video to understand the basic bolted joint analysis. Only one suggestion if you can explain with bolt load diagram, it will be more informative for all the users who are new in ANSYS.

@graspengineering9249 5 жыл бұрын

Okay, Thanks !

@mahmoudabuelela3097 2 жыл бұрын

Thank you for sharing, interesting video. I believe the RTJ oval gaskets are more difficult in the simulation, I was struggling in their solution convergence given bolt preload equal to 50% of the bolt material. If you can run another video with using RTJ gasket that will be much appreciated.

@graspengineering9249 2 жыл бұрын

Welcome ! We will try to simulate.

@AyaFahham-ol2qx 2 ай бұрын

Your content is very valuable, please allow translation into Arabic

@graspengineering9249 22 күн бұрын

Will try to upload

@joshuachacko6496 3 ай бұрын

sir how can i find bolt pretension value ? is it from the geometry and internal pressure?

@bhaktimalve3369 7 ай бұрын

Sir warm regards! Can you please provide the separate video on geometry, how is it designed?

@graspengineering9249 7 ай бұрын

Hi ! We do have seperate playlist for CAD modeling. Please visit our channle page for more details, thank you

@VanelLoruss 4 ай бұрын

May i get the ansys model please ?

@nilofarpathan665 5 жыл бұрын

Very helpful

@graspengineering9249 5 жыл бұрын

Thank you

@ManojSalgar55 Жыл бұрын

how to calculates shear stress in the bolts ?

@parthshah730 2 жыл бұрын

Can you share the link to download the fixture so that we can simulate in ansys?

@graspengineering9249 2 жыл бұрын

Please refer our blogpost to download the geometry file : www.graspengineering.com/bolted-flange/

@parthshah730 2 жыл бұрын

@@graspengineering9249 Sir iam a bit confused because i am unable to simulate this as on bolt i am shown two contact surfaces. Please guide me for same

@parthshah730 2 жыл бұрын

even i am unable to identify threaded portion

@graspengineering9249 2 жыл бұрын

@@parthshah730 Please follow the steps shown in the video. You need to select proper contact and target surface, or else use auto contact and then modify that manually by selecting respective surfaces.

@graspengineering9249 2 жыл бұрын

@nanjunisarga6882 6 жыл бұрын

good demonstration of the video. It would be very kind of you if you can share with the wb zip file to follow up with your video demonstration. I have the following questions 1. how are you changing the bolt pretension values on what basis. 2. how to select the target and contact regions , I mean how do you decide gasket should be contact surface and flange should be target ? is target should be stiffer than contact is this the thing you considered? 3. why have you choose the 3 load steps , why not 2.? as in 1st load case you have chosen bolt pretension and in 2nd step you can apply internal pressure and compensating pressure . y did you chose 2nd load step as lock for bolt pretension? Please help me in clearing my doubts, thanx in advance.

@graspengineering9249 6 жыл бұрын

Thank you for detail view! Please find reply below to your questions. 1. I had assumed bolt pretensions value just to show the effect of it. Generally based on on bolt size and grade you can use bolt pretensions. For M10 and course thread grade 8.8 value is lower, u can increase up-to 12.9 grade if contact pressure is not sufficient. 2. It's based on contract behavior like symmetric or asymmetric. For asymmetric behavior, target surface should be stiffer, lower order mesh surface, coarse mesh surface and larger surface should be target. Opposite surface should be contact. 3. You can do in 2 load step too. I want to see the effect seperatly of bolt pretensions reaction hence added load step 2 locking and load step 3 locking + pressure. If you lock then only I can see reactions.

@nanjunisarga6882 6 жыл бұрын

thanx for the time to reply , yes it's clear to me now. It would be your gratitude if you can share me the wb zip file . thank you once again. Hope to see much more wonderful videos by you.

@graspengineering9249 6 жыл бұрын

We usually delete wb files once video is done. You can model in DM and do analysis as per suggested in video. Please let me know if any further help needed.

@sur1982indiatimes 5 жыл бұрын

Since both ends are open, there will be equal and opposite reaction to balance the system. Still we need to apply compensating pressure?

@graspengineering9249 5 жыл бұрын

We need apply constrain in FEA. Hence if you're constraining one end, you should apply CP at other ends. If constraining both ends, then no need of constrain.

@JT-91 4 жыл бұрын

Applying boundarys can be avoided for equal and opposite shells and beams but for solids they induce a small rotation and you need to lock that with BC

@UmutCivici1 3 жыл бұрын

Hello, I realize that you did not write the friction coefficient, instead you input interface offset 0.1 inc

@graspengineering9249 3 жыл бұрын

Apply coefficient of friction as 0.1 instead of offset distance, which is applied incorrectly in the video.

@abhijitkadam2570 2 жыл бұрын

Can you please explain, how to use gasket clouser data for gasket in this FEA.

@graspengineering9249 2 жыл бұрын

You can use to define material properties of gasket.

@shridharkumbhar6082 5 жыл бұрын

THANK YOU

@graspengineering9249 5 жыл бұрын

Welcome !

@praneshsb8979 2 жыл бұрын

Hi, How to calculate the elastic modulus, C01, and C10 constants for rubber, based on hardness value?

@graspengineering9249 2 жыл бұрын

You can use hyperelastic methods such as Neo Hookean. We will upload one blogpost in our blog soon.

@Anand25692 4 жыл бұрын

Sir, which gasket material is used in this analysis?

@graspengineering9249 4 жыл бұрын

It is linear material only, Metallic gasket, steel.

@sandyou03 3 жыл бұрын

Sir. if want to simulate with rubber gasket. Can you tell the required data? Waiting for Reply

@vagemarina 4 жыл бұрын

good video, but you can`t just solve the problem by giving the higher pretension... the er is limit for depending size of bolt?

@graspengineering9249 4 жыл бұрын

Pretension is calculated based on size of bolt. You can cross check by applying higher pretension load.

@jiraiyasensei5436 2 жыл бұрын

Sir my bolt pre tension after solving is coming more then applied bolt pre tension how is this happening can help me sir ?

@graspengineering9249 2 жыл бұрын

It means it is adding values to bolt pretension. It should not happen, check the material details applied properly or not.

@vishalastekar3492 3 жыл бұрын

cyclic symmetry can be used here to reduce the model size. Sir can you make a video for that..

@graspengineering9249 3 жыл бұрын

We have separate video on cyclic symmetry. Please refer our channel page.

@FonsecaEugene Жыл бұрын

Can we use frictionless support instead of compensation pressure?

@graspengineering9249 Жыл бұрын

Yes, you can but better to use cylindrical constraint and radial direction free. Frictionless support only provide constraint in normal direction which is useful for defining symmetry conditions.

@amvali 4 жыл бұрын

Hi there, How would you do the analysis if the gasket was Neoprene? I know the material would be nonlinear, but how do you do BC? Do you have any video for nonlinear material like rubber?

@graspengineering9249 4 жыл бұрын

Their are two ways to perform nonlinear gasket analysis . 1. Define gasket in mechanical as stiffness behavior, do gasket mesh and define linear, nonlinear loading pressure Vs closure curve in materials. Do the simulation (it is complex) 2. Use hyper elastic material properties, for neoprene rubber calculate Neo Hookean coefficient and defined in material details and do non linear analysis.

@amvali 4 жыл бұрын

@@graspengineering9249 Thank you for the reply. should I have the gasket as a solid body and change stiffness in mechanical? If that is the case, how would you do that?

@josftxn 5 жыл бұрын

Hello, i put the same values but i have an error.. like the problem is sub constrained.

@graspengineering9249 5 жыл бұрын

Hello Jose, Please kindly check if the model is properly constrained, check contact tools, meshing * material inputs used.

@josftxn 5 жыл бұрын

@@graspengineering9249 Hi! yesterday works! haha was a mesh trouble... when the gasket are a mettalic material works, but when i put gasket material linear unloading needs large deflection model and gives me a lot ot deflection on gasket by bolt pretension.

@graspengineering9249 5 жыл бұрын

@@josftxn Good !!

@josftxn 5 жыл бұрын

@@graspengineering9249 how can i modelling with gasket linear unloading? needs high computational cost?

@rakeshpatil3723 5 жыл бұрын

@@josftxn you can model linear unloading gasket curve, but most of time do not have exact unloading data, also difficult to converge.

@joshuasamjk 3 жыл бұрын

Can I have geometry or model of bolted flange gasket in Ansys

@graspengineering9249 3 жыл бұрын

Hello, yes we uploaded CAD model in our blog, www.graspengineering.com, refer FEA CAD model

@boranbalun2757 3 жыл бұрын

@@graspengineering9249 www.graspengineering.com/bolted-flange/ the file here is not the same geometry at the video. Could you please upload the correct geometry?

@joshuasamjk 3 жыл бұрын

@@boranbalun2757 yeah some other

@sachinnagavkar 4 жыл бұрын

Can I get this flange modeling video?

@graspengineering9249 4 жыл бұрын

We dont keep backup. Please refer cad model from grab-cad and perform the simulation.Let us know for any issue. thanks !

@saberheidari3276 5 жыл бұрын

where can i see the videos to create the geometry like this?

@graspengineering9249 5 жыл бұрын

You can find 🔗 in description for few CAD modeling videos like. Vertical vessel modelling. If you find any difficulties us me know. Thanks

@saberheidari3276 5 жыл бұрын

Is it possible to give me the ansys file of the this model i really need it @@graspengineering9249

@graspengineering9249 5 жыл бұрын

This file is uploaded few month before, it is not with us now. It hardly takes few minutes to perform simulation. You can let us know for any concerns.

@saberheidari3276 5 жыл бұрын

Grasp Engineering i want to simulate a special flange bigger than 24 inch with 1500# pressure. in the standard asme b16.5 there isn't a flange with bigger than 24 inch in 1500#. then at the first i want to simulate a 24 inch flange and then i want to compare it with the special flange. Am I going in a right way?!

@graspengineering9249 5 жыл бұрын

Yes, you first analysis special flange And if you need you can compare with other flanges but both should be similar geometric aspects.

@kalpeshshirode4758 5 жыл бұрын

How and where can i get the closure Vs pressure values for both loading and unloading

@graspengineering9249 5 жыл бұрын

You will get from manufacturer or Gasket supplier

@kalpeshshirode4758 5 жыл бұрын

If it is not available with them. I mean to ask is there any alternate formulations are available to get this values. As i have inconel 625 material having true stress strain data. So can i get closure vs pressure values from these

@graspengineering9249 5 жыл бұрын

If you have non linear material, then you can define as it, it is basically testing out. Also if you shore A hardness you can calculate material constant using Neo Hookean method.

@kalpeshshirode4758 5 жыл бұрын

@@graspengineering9249 can I have your contact number or email id Actually I have educational project where I want the non linear loading and unloading graph shown in ansys workbench material library as a output result.

@graspengineering9249 5 жыл бұрын

Pleas refer channel introduction for contact details.