ANSYS 15 Tutorial - Frictional Contact & Bolt Pretension

[@JoshZagorski]

This is the best generic Ansys tutorial I've seen

[@drdalyo]

Thanks!

[@winnaveen7197]

@@drdalyo I have commented you Mr.DrDalyo regarding bolt pretension that to change the direction, I hope you are gonna sought this.

[@taneliheikkila8276]

Thank you buddy! Much better videos than those CAE worldwide videos that are so darn boring.

[@drdalyo]

+Taneli Heikkilä Haha ya there hard to watch. Thanks!

[@andreashansen8520]

+ 1

[@farmerandy76023]

Great video. Much better than $$ training I've taken from ANSYS channel partner.

[@aabhamishra9921]

I would take time to appreciate the way you taught. A must watch video for the ones, who wishes to learn the Static Structural Analysis using Ansys, but can't find it easy to do. This video, takes you through all the basic concepts required for the Analysis and that too without over exaggeration, and by the end of the video, you realise that you have understood it and ready to go!!! Thank you so much Sir. Keep up the good work. 🔥🙏

[@imanmaroef4465]

Excellent tutorial, smoothly show examples of crucial know hows in performing efficient FEA computation. A tutorial on the character of various contacts and their control, especially when plasticity occurs at contacts would be very appreciated.

[@y.s.gurubasavaraya5549]

Very good video tutorial on contact. Please post more tutorials on various examples, stress concentration, dynamic analysis

[@iftekharrousseau493]

great video, please keep uploading more videos on Ansys workbench!!!

[@drdalyo]

Thanks!

[@kapoljawale5994]

Thank you so much Dr.DalyO!! this helps a lot, thank you for the thoughtfulness to provide the models as well.

[@drdalyo]

Thanks!

[@harshalpanchal883]

thanks for the video. it helped me for solving bolted assembly problems in Ansys.

[@eduardoengelhardt1353]

Amazing tutorial man! Thanks. You really master Ansys Mechanical. At 10:41, maybe if you add the displacement on both sides you get something closer to 0.3 mm. (Idk if you were already considering it)

[@yuxiao4963]

Best ANSYS tutorial video ever!!! really appreciate!!!

[@drdalyo]

Thanks!

[@cesarhdzipn]

Simple, fun and super useful, thanks for sharing, you have one new follower

[@kiranravindranath10728]

Great tutorial...Can I use the same concept for my model, which has an adhesive joint and a screwed joint, to check if the adhesive gives away as I tighten the screws? Also I would love to see how the reliability (time related failures) of a model can be simulated using ANSYS. Eg., If I were to simulate environmental Stress Cracking by putting the part in a humid oven, after how long the weakest member is going to crack. Good job!

[@LucasAlmeida-ny4ux]

Thanks for the video!! I'm learning a lot! Please, could you post more examples using Bolts pretension...?

[@varaprasad7105]

Nice tutorial. Suggest some tips in ansys workbench.

[@ussabne]

I am grateful for the video. It helped me a lot.

[@annazhao7688]

Very helpful tutorial! Could you make some video tutorial for Ansys Icepak? Thanks!

[@phanikumarsimhadri8124]

Thank you for your video, let me know what is the difference between von Mises stress, contact stress and frictional stress

[@santiagogaborovmilich7887]

Thanks for the tutorial. It helped me a lot! If you can explain why you chose a symmetric behavior for the contacts would be great. Thanks again for sharing this

[@drdalyo]

+Santi GM Hey no problem! To keep it simple, symmetric behavior gives lower penetration however it is more computationally expensive. It also provides contact results on both surfaces of the geometry.

[@ucphamanh12]

Thank you so much for your tutorial video, this also guide me some suggestion in my work. But I still in my trouble. I have some case for static analysis. If there are 3 components. First, element 1 make element 2 deformation, then element 2 to contact with element 3 and transfer moment. All contact is frictional. I try some option in contact, but program didn't give me any suitable results

[@刘胜杰]

Great video.i am now doing the simulation about the bolt thread .i got some information about it from the ANSYS mechanical .but i cant understand it .could you do a video about it .THANKS

[@drdalyo]

+刘胜杰 There is actually a new function in ansys 16 i think that can do bolt threads for you (meaning you dont need to model the actual threads) maybe check that out. If not I could look into doing a tutorial on it. Its a good topic. Thanks for watching! please subscribe

[@刘胜杰]

+DrDalyO THANK YOU VERY MUCH

[@chaminirodrigo2676]

Hi DrDalyO, This is indeed a very helpful video. Thank you very much. But when I applied bolt pretension it was not centered and my results are different from yours. How can I make the bolt pretension centered?

[@drdalyo]

Hi! Are you sure you selected the cylindrical surface for the pretension? Maybe double check your geometry to make sure there are no mistakes.

[@chaminirodrigo2676]

DrDalyO yeah I selected the cylindrical surface and still the pretension appears on the aide of the bolt

[@luissilvestrevacaoyola2021]

Thank you so much man! It has been very useful for my work!

[@drdalyo]

Welcome!

[@hernanmariani5174]

great video!! thank you so much!! can you do a tutorial about thread contact? with that function available with ansys 15 and latest?

[@phitrantruong3125]

hey man, how can i explain my thank to you? it's so meaningful for me (a self-learner) --- thanks million...

[@jaevulen]

great video! very easy to understand for a noob like me

[@Naveen_Anan]

Very nice videos!!! I have the following questions: 1. Let's say that you have some deform-able bodies and you need to connect through Rigids, How to we do that in ANSYS? 2. Is there any option to transfer the loads, say force or pressure on a surface through a contact surface without physically connecting it or is there any equivalent options. 3. can we plot shear force/ Bending moment diagrams on a 3D models; as in your 1st video on 3D beam.

[@drdalyo]

+Naveen Anan you can change the option from deformable to rigid in the Geometry branch in the outline for each body. Yes there is something called Connections to create contact. Moment and shear diagrams are for beam elements only, not for general 3D elements

[@saikumars2285]

Thank you for your videos....very helpful to me Sir, How can I apply prestress to a slab

[@CharanSingh-wp2yi]

Very useful video brother thank you now I studying in Glasgow Caledonian University and course work depends only on ansys

[@Joventino1]

Great Tutorial! I have a problem of a beam supported on a concrete floor. This beam has no inertia to distribuit the nodal force equally along its lenght, and I want to know which area of the concrete floor that is supporting the load. How can I model it? Can you make a tutorial video regard this subject? Thanks.

[@SoccerJustforFunlive]

Thank you so much .... ! u explained amazing... i looking forward to see your other tutorial

[@drdalyo]

Thanks!

[@stefaniamagnettigisolo5775]

Thank you for the video, very well explained!!!

[@drdalyo]

Glad it was helpful!

[@МаксВетер-х8ш]

Thank you so much for helpful tutorial!

[@drdalyo]

Welcome!

[@seanx.c7453]

@@drdalyo Hi DrDalyO, can you please make a tutorial on modeling in Design Modeler? Specifically, how do you create multiple bodies/parts and make sure that they are at the correct location?

[@reicht4]

@6:15 4 manual created contacts, @10:05 you got 3. I think it was too non-lineer :)

[@yusufpolat13]

most clear explanation by the way.

[@kashifnaseem220]

Hello, thanks alot for this tutorial. I have just one question, for bolt pretension, you went for adjustmet but didn't explain what does it mean? like if i go for Load, does that mean torque applied on bolt, while we are fastening it?

[@mohammadsajid9414]

Excellent presentation, Thank you

[@drdalyo]

Glad you enjoyed it!

[@ud4458]

Great video! I am applying frictional contact, however loading perpendicular to the friction (bending). Can there be friction and keep the body fixed ?

[@kaankkaraman]

i saw first time a native english guy teaching some ansys stuff

[@Made_by_profs]

We give adjustment and we don't give forces So we speak about deformations( if this bolt displaced 0.3mm due to applied force ) . Did i get true ?

[@tonyn300]

In general, how do we know what friction coefficient to use, especially if it’s thread on thread.

[@omerdogan85234]

excellent tutorial, could u please make tutorial about how to overcome convergence issues in multibody analysis, how to read the solver output, time, force criterion plots, thanks

[@gujexp25]

What type of contact should i use if one plate is grouted in foundation and second plate is bolted to the grouted plate. Second plate is a footing of a frame. Bolt is torqued. Could you please explain what contacts and boundary conditions should be applied? Thanks

[@Sheaker]

Dear DrDalyO. At 8:44 You said very important thing about location of pretension cut. I have long bolt with pretty high pretension and I am getting large step in deformation of my bolt. Could You possibly provide any solution to get rid of this unrealistic deformation? Thank You for sharing knowledge.

[@winnaveen7197]

Hello DrDalyo could you please tell me how to change the bolt pretension direction to another direction. I really want to know it.

[@sanjeevgupta1076]

I follow step by step, but at last when I click to solve then I get error message that One or more bodies may be under constrained and experiencing rigid body motion. What should I do.?

[@tejasmetkar9483]

Yes i had same problem

[@basmaal-ghali9174]

i have a screw inserted into a bone, how to show the stress distribution in each part (nothing appeared in my results, just the colored force values)? also, the screw penetrated about 2mm inside the bone! how to prevent penetration? i used normal lagrange but the output results were wrong

[@MrHeojun]

thanks for the video you helped my project really much

[@drdalyo]

Thanks for watching!

[@mariokar985]

Thank you for this video, it has been very helpful!

[@drdalyo]

Welcome!

[@nirmal148]

how to apply proper hex dominant mesh in stepped tapered shafts??

[@SUNILKUMAR-bw4ov]

Please let me know how to apply simple support to the half circular sold model, I faced this problem when I go to tool test, please kindly share how to apply simple support boundary conditions

[@mipila]

Thanks, could you explain about trasient structural?, I want to learn this part of ansys.

[@drdalyo]

+Michael Pineda sure i could make a video on this. Transient basically means the effects over time, so time becomes meaningful in these analyses.

[@smartchits20]

can you suggest how to prestress a tendons of a beam

[@masselindqvist]

Excellent presentation, thanks...

[@ezgiak8064]

Could you please show how we can obtain axial and tangential forces after solving the model? Regards, EA

[@dr.zuhairkadhimjahanger1103]

Dear Dr. Dalyo,Very nice tutorial as many as you have done.How could I download the CAD file?Thanks

[@drdalyo]

for now I have not posted the cad files, maybe in the future I will post them.

[@francescodallevedove5018]

Very nice video, I have a question though: what if I need to evaluate the life? On the model I want to set some bolt pretensions and some external loads. Only the external loads should determine the cyclic load, while bolt pretensions should be a constant. How can I set this in the fatigue tool? Or maybe this is automatically done by the software? Thank you in advance

[@drdalyo]

Please do some reading on the fatigue tool and how it is used in Ansys

[@clarababy6872]

Hi, I just wanted to ask why you didn't switch on gravitational load? I see that without it coeff of friction doesn't affect the model at all. It's kindof totally confusing at the moment for me. Looking forward to hearing your idea about this

[@drdalyo]

Coeff of friction should not have anything to do with gravitational load. If the friction is not working, you should investigate the contact not gravitational load.

[@clarababy6872]

@@drdalyo ok thank you. It was a frictional contact, which was defines as you described here. Anyway will chk this up

[@shubhamtongire3719]

Sir can you explain in detail all processes you did in this video

[@victorliu5665]

I am running a ansys anlysis with 114 bolts in the model. most of the bolts are contact with a cylindrical/curve surface. ansys give an error "The solver engine was unable to converge on a solution for the nonlinear problem as constrained. Please see the Troubleshooting section of the Help System for more information." Do you have any suggestion what I should do to solve the damn problem? Thank you very much in advance.

[@ShurikProg]

HellO! If I have 100 bolts in different places, can I duplicate contacts and loads from one to others?

[@tomglansholm8451]

Great videos! Very helpful! But isnt 0,2 a bit to small for frictional coefficient between steel? When I make the coefficient bigger my solver solution do not converge.. :(

[@drdalyo]

+Tom Glansholm well if its lubricated no. But if not then ya would be higher. In most cases it wont change the results significantly depending on where is your point of interest. If you really focused on the contact results then ya, put a more realistic value. Also any value above 0.2 i believe in Ansys makes it more difficult to resolve and takes longer, hence your convergence problems. You might have to make smaller substeps to solve. Good luck and thanks for watching!

[@tomglansholm8451]

Thanks again! I am a engineering student and havent taken any courses in advanced FEM yet so this is just for fun. But im interested of the effects of having a frictional contact, not the contact itself. Like if you have two plates and a bolt connecting them. The frictional forces prevents shear stress in the bolt if you have the bolt pretensioned(? english) so that normal forces appear between the plates. Maybe some other approach is better?

[@2008uitm]

Thank you very much Dr.Dalyo. Very helpful tutorials. I wanna ask you I am modelling wall using masonry bricks and I want to add Interface connection (e.g INTER193 : 2-D 6-Node) between the faces of the brick. I don't want to use the automatic contact provided by the Ansys. If you have the command code I will be very thankful

[@adshah20]

The guy is a legend

[@drdalyo]

Thanks haha!

[@faz321]

Could you show how we can assign steel fibres into concrete properties to analyze how the fibre itself can effectively increase the shear resistance

[@drdalyo]

+Fahad AlZahrani that will be in an upcoming video.

[@aymanhagfarh3890]

Thank you very much, it was so helpful

[@drdalyo]

Glad it helped!

[@victorliu5665]

Excellent tutorial!!!!

[@drdalyo]

+Liu Victor thank you!

[@victorliu5665]

Do you have a tutorial regarding how to see the load distribution after apply a force/pressure on a surface or how force reacting each other among different components? At ansys When we apply a force to a surface, the load is even distributed I assume? Can we apply uneven distributed load to a surface at Ansys? Thank you very much in advance.

[@drdalyo]

Here is a tutorial where I use a varying load: kzbin.info/www/bejne/o3K9fHqEmKl3rNU To see shear and moment results, you would need to use beam elements, and use the beam results tool. You can also see reaction force results if you change the scoping method

[@weiliu5353]

Thank you for so much useful video,where can i download this CAD models.

[@drdalyo]

+wei liu should be in the description below of the video, if not try to follow along with the tutorial. You can also email me

[@muddassirrazzaq7822]

Make a video on gear and contact between teeth of them

[@Pralin_Leo_Messi]

how to change direction in bolt pretension

[@drdalyo]

Dont think its possible..

[@maverickzed4930]

Hi Doc, could you please go ahead and post a video on how to change the position of pretension on the bolt? Also, I'd really love to know what the symmetry/asymmetry in the contact area means, tnx by the way, the tutorials help alot. ;)

[@yusufpolat13]

why solution is a nonlinear when we use the frictional contact? why there is an iteration? in cfd the guessed initial values of the parameters are iterated i understand that but at this point why do we need to make an iteration ? if someone explain me i will be very appripriote. thx.

[@gabrielrambo1296]

Hello, can you explain how to move the section that ansys applies the pretension?

[@prakharjain2548]

how do we specify the compression only nature of the threads of the bolt, like the force transmitted between the threads of the bolt and the surface of the body to which bolt is connected?

[@vikramraoklvicky2862]

Beautiful video

[@israelbravo1388]

Thanks a lot for this video!!!

[@drdalyo]

Welcome!

[@JessicaSNSDZzzz]

Thank you for your videos sir, i'm really appreciated. Do you have any ansys video that is related to SMA(Shape Memory Alloy) properties or not? i'm so curious of how to apply these property in ansys.

[@freemansg70]

thanks a lot for videos, quite helpful!

[@drdalyo]

Welcome!

[@Pumka_games]

Greetings! Thanks you very much for your videos! It's all really helpfull. How do you think to make tutorial about construction made from beams and using the beam-element (line-body , i guess) to analize it? Or using different kind of elements in different cases and how to change it in WB. I think, it's the base knowledge and it will be really helpfull, espetially for beginners.

[@drdalyo]

+skullheaddd1 I could add a tutorial like that to my list. I was thinking of doing a truss example which contains line bodies. In geometry modeler you could just draw lines, and apply a section to the line and create a line body. Video to come.

[@Pumka_games]

+DrDalyO The truss example would be just what is needed. "In geometry modeler you could just draw lines" - but how can I do the same thing when imporing geometry from SolidWorks, for example? How can I convert solid bodies was modelled in SW to line-bodies in WB?

[@mrc9946]

Thanks for your tutorial they are really useful! Mesh question: Some guys (in DM) use in to divide model (slice material) in “regular” bodies and form with them a new part, in order to obtain a more regular mesh. For example consider our bolt and slice it in one minor diameter cylinder and one greater diameter cylinder: or our “C” bracket as a part made of 3 “body” plate. What do you think about it? it makes sense or maybe it is and old habit who comes by older or different program? Corner and edge question: Some guys use to delete fillet radius from model in order to obtain more regular mesh (like above) and reduce computational

[@shanfanluo3810]

slice is often used for the complicated model, mostly we just care about the high stress location, so sometimes we simplify the model to reduce the calculation time

[@prasanthn3814]

how to calculate bolt torque? Pls explain

[@mayviv20]

Excellent tutorial

[@sachinsalunke3076]

hey #DrDalyO , Thanks for sharing knowledgeable videos for us, Please add videos for Transient, spectrum and random analysis. Thanks in advance!!

[@shanfanluo3810]

hi, thanks for you video, usually the diameter of the hole in the bracket is slightly bigger than the bolt, so there is a gap between the two cylinder face, will this still be able add frictional contact?

[@arsdescano5846]

Nice Tutorial, Keep on sharing.. Cheers!!

[@drdalyo]

Thanks for watching!

[@afsalmuhammed4442]

very usefull video expalin many things very quickly

[@gamelog-g6v]

I like your tutorials. Please keep on sharing. I can give you some struggling problems. And I have a question about this video, Can you explain the reason why you choose Contact Behaviour as Symmetric? What if I choose "program controlled"? Thank you so much.

[@drdalyo]

+Ufuk Bilgin program controlled will choose the best default method, it wont affect the results in this case. you can do some research on this in the help. (ex. symmetric vs asymmetric), basically symmetric will show you results on both surfaces on the contact, and asymmetric will only show on one surface. asymmetric is usually less solve time.

[@gamelog-g6v]

ok really thanks:)

[@sravs4lavs]

Hi this is Sravan I like this tutorial. I am a beginner in Ansys work bench. Can u please do a tutorial with one side bolted n the other side loading.

[@drdalyo]

+Sravankumar Nerella I think it should be very similar to this example. Maybe start by importing the model and using the techniques i showed regarding contact with yours and see where you go. Let me know!

[@franciswantono9043]

Hello Dr. DalyO. Am trying to model a prestressed concrete beam following your video in static structural "modelling of RC beam". I've modelled the beam, but how can I apply a prestressing force to the rebar using the same example.

[@Ramakantmumbai]

Very nicely explained. thank you very much.

[@prabhurao751]

Hi sir How to change bolt pretension load acting orientation? In this case you applied load horizontal direction.suppose if you want apply pretension of load vertical direction. How to do that.

[@drdalyo]

At the bottom of the graphics window where the model is displayed. If you select the bolt pretention, you will see a red arrow at the bottom, near the ruler. You can click this and it will flip the orientation. You should also be able to do this in the details of the bolt pretention i believe. You cannot apply bolt pretention other than along the cylinder axis.

[@prabhurao751]

Thank you sir

[@damienbarciet3439]

Is it possible to use a beam in "connections" between two remote points and apply the bolt pretension to this beam and not to a geometrical object ?

[@jasinsalihu2259]

DRrDalyo could i lern which version of ansys is this one

[@drdalyo]

It is version 15

[@alpha754293]

+DrDalyO Thank you for this video. I am learning a LOT VERY quickly, so these videos are DEFINITELY helpful/useful. I did have one question though - you had mentioned that you can create a coordinate system and change the bolt pretension cross-section location. Can you please create and upload a video showing us how to do that. That would be greatly appreciated. Thank you.

[@nickdaly8972]

Hi I am working with ansys aim and am having troubles with a multiphysics analysis. I have 2 plates that are bolted down and electrical current is run through the top plate with the bottom face of the second plate being grounded. I should expect to see and increase in temperature causing a structual change but all I get is an increase by .0008 degrees. I think there has to be something I haven't considered with the contact between the two plates and having additional resistance but I'm not quite sure. Any insight on this?

[@VinayVaishnavi]

very nice tutorial SIR. Was very helpful indeed i just have a small doubt. I need to design and evaluate a double skinned composite walls with shear studs. So can i do it in ansys or must i use any other software. If i can use ANSYS itself how can i start or proceed

[@daniele7073]

Can i know if i have two parts(assembled) close to each other but isnt touching. Can i contact them as frictional?

[@drdalyo]

You could create contact elements even if they are not touching. It would just use more computing time

[@syedhossain3165]

How do you download the example parts/assemblies?

[@stevenshi3495]

Hi DrDalyO, I followed your tutorial step by step but I couldn't get the contacts right. I'm using R16.2. I got question marks on the left of my frictional contacts. I got error messages saying "BONED or NO SEPARATION type required for this contact configuration". The error messages point to my question marked contacts. Any idea why it happens? BTW, really nice tutorial. Thanks! Steven

[@farhadnekonam1298]

Thank you for the useful video,where can i download this CAD models.

[@drdalyo]

Geometry file download for free can be found here: goo.gl/IVWuI1 It is also indicated in the video description. Thanks!