QuentinB

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1. Simple impact simulation do not converge

Thank you very much for the help, I will try to run this simulation during the week with the modifications you suggested. I would never have noticed these errors without you since these values are directly taken from the Altair Tutorial. Best regards, Quentin

help？
3. Simple impact simulation do not converge

Hi, I am trying to learn how to realize an impact test with RADIOSS. I folowed this tutorial from Altair University: https://www.youtube.com/watch?v=aDeNhQFvqjE&t=304s I folowed every steps of this video but my simulation seems not to converge... I stopped it after 30 minutes and here is the last iteration message: You can see that after 1715s I had an error of 99.9%, and the remaining time was increasing again and again (so the response couldn't converge) Before running the test, I had no error in the model checker: And here is the picture of mu model: I attached a file to this post which is the model i use for this simulation. Thank you very much for the help. Quentin BERMOND Impact test-tutorial.hm
4. unexpected results on a static analysis

There was no particular reason why I used pressure so I tried your solution and it worked, the simulation gives me the expected results. I am not sure the magnitude is right but the type of response totally is. Thank you very much. You're right, it would work for that case. As I just mentioned previously, Pranav solution also seems to work, I'll compare both results and use the best one for my thesis. Thank you very much for your answer.
5. unexpected results on a static analysis

Help ? I still didn't find a way to solve this simulation
6. unexpected results on a static analysis

Hi thank you very much for this reply, I used the "pressures" tool from the analysis panel. The concrete block is 500 kg The "white area" which is the contact between the block and the structure is 34 950 mm2 g=9.81 So by using the relation Pressure= Mass*g/white area I find that pressure = 0.140 MPa This is the value of the magnitude I use for the pressure on the entire white area. Should I proceed differently ? I attached some pictures to show how the pressure is applied on the elements. Hello ! You're right, it is a standard response, but this is not what I expected because the concrete block cant't be deformed like that in its center area. I might be wrong but the constraint is supposed to be concentrated in the "pillars" relied to the ground. The following picture shows the case that happens ( case number 1 on the top) and the one I expect to model (case 2, on the bottom). In the second case, the bloc is not deformed, which is what happens in reality (we have some measurement that shows the concrete can't bend in that case. You asked for a scale. The maximum displacement in the center is around 2 mm while I expect a value 10 times smaller.
7. unexpected results on a static analysis

Hello, I am a master degree student and i'm currently try to solve a finite element problem for a school project. I want to run a a static analysis about a structure that is supporting concrete blocs. I've linked a picture of the problem to this message. The concrete blocks contact with the structure is not continuous. I have linked a picture of my Hypermesh model with the contact highlighted in white. I use a pressure reparted on this white area to model the actions of the concrete blocks on the structure. The concrete bloc is not deformable. The third picture coresspond to my simulation results. I am not sure these results represent the reality because as I mentionned before, the concrete block is not deformable so the structure is not supposed to bend that much in the middle area. I suppose the software consider that these pressures are independent, so how should I proceed to make Hyperwork understand that all these pressures belong to a same solid in order to see the "pillars" of the structure being deformed instead of the middle area ? For this type of loading (mass that has a complex contact with the structure) should I run a multi-body simulation instead ? I don't know if my questions are clear, feel free to ask me some more details if you don't understand it. (i've linked in 4th picture the constraints in the structure)
8. What's the best way to connect Parallel mid-surfaces ?

I did, but it was only about the theory...This is the first time I use a software like hypermesh (before I was using automeshing tools without thinking about the quality of my mesh). Actually, I practice a lot because i found out recently that finite element analysis is extremely interesting so I want to understand it as much as possible. My next goal will be the understanding of optimization with Optistruct. I already red the free E-books about Hypermesh and Optistruct but sometimes years of practice are way more important than just reading theory. I asked those trivial questions here to have some experimented users feedback and to be sure it was the most efficient thing to do Thank you for all those answers Tinh and Pooja S !
9. What's the best way to connect Parallel mid-surfaces ?

This is what i obtained with the imprint tool... so according to you, it is better to use this model ?
10. What's the best way to connect Parallel mid-surfaces ?

I tried to connect the planes by using the tool "imprint" (mesh edit). I obtain the patter shown on the first picture with this tool and then i used the theory from the pages 179-181 and connected those two parallel planes by vertical ones (second picture). Is it the right way to connect those two welded planes ?
11. What's the best way to connect Parallel mid-surfaces ?

They are Arc-welded but i don't know the exact shape of the weld. the size is all along the contact between the two bars (10 cm long)
12. What's the best way to connect Parallel mid-surfaces ?

Hi, I’m a beginner with altair Hypermesh and today I try to connect two parallel surfaces together. those midsurfaces are exctracted from the model shown below (the plates are considered to be welded together in reality).My goal is to mesh those surfaces and recreate the contact in yellow shown on the second picture. For the moment, due to the mid-surface extraction, I have a gap between the two planes. should I use RBE2/RBE3 elements to connect them ? My goal is to have a contact that behave as much as possible as if the two planes are welded. Thank you very much for the help
13. Connecting two perpendicular mid-surfaces

I found the solution, i just had to select the "trim results" option thank you
14. Connecting two perpendicular mid-surfaces

Thank you very much for this fast answer tinh I tried the first solution, my surfaces are in contact but i still have a free edge as shown on the pictures below (basically, I extended the vertical planes to the horizontal one). Is the contact existing even with this free edge, or I still have to use an other tool to "merge" those planes to be sure my nodes will be aligned ?
15. Connecting two perpendicular mid-surfaces

Hi, I’m a beginner with altair Hypermesh and today I try to connect two perpendicular surfaces together. My goal is to mesh those surfaces and be sure that the nodes of the horizontal plane are coincident to the ones on the vertical plane. For the moment, due to the mid-surface extraction, I have a gap between the two planes that's why the edge is a "free edge", from what i understand of the software. I assume that before starting the meshing part, i should connect the two planes together and have a "shared edge"... Is it the right way to deal with this situation ? Thank you very much for the help
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