Jump to content

Search the Community

Showing results for tags 'contact'.



More search options

  • Search By Tags

    Type tags separated by commas.
  • Search By Author

Content Type


Forums

  • Altair Support Forum
    • Welcome to Altair Support Forum
    • Installation and Licensing
    • Modeling & Visualisation
    • Solvers & Optimization
    • Multi Body Simulation
    • Conceptual design and Industrial design
    • Model-Based Development
    • Manufacturing Simulation
    • CAE Process Automation
  • Academic Partner Alliance Forum
    • APA - Composites
    • APA - CFD & Thermal
    • APA - Vehicle Dynamics
    • APA - Manufacturing
    • APA - Crash and Safety
    • APA - Noise, Vibration and Harshness
    • APA - System Level Design
    • APA - Structural and Fatigue
    • APA - Marine
    • APA - Optical Design
  • Japanユーザーフォーラム
    • ユーザーフォーラムへようこそ
    • Altair製品の意外な活用例
    • インストールとライセンス
    • モデリング(プリプロセッシング)
    • シミュレーション技術(ソルバー)
    • データ可視化(ポストプロセッシング)
    • モデルベース開発
    • コンセプト設計と工業デザイン
    • 製造シミュレーション
    • CAE プロセスの自動化
    • 学生向け無償版
    • エンタープライズソリューション

Categories

There are no results to display.


Find results in...

Find results that contain...


Date Created

  • Start

    End


Last Updated

  • Start

    End


Filter by number of...

Joined

  • Start

    End


Group


AIM


MSN


Website URL


ICQ


Yahoo


Jabber


Skype


Interests


Organization


Location

Found 111 results

  1. Hello everyone! I need your help. Fllowing picture shows the case i want to simulate. I have a problem to create the contact between the component and rigid walls. Walls have to be fixed and the part lies on them and is fixed by screws. I would be very happy if i get your help. Many Thanks in advance! Best wishes from Germany!
  2. Hi all, In my model, there are many contacts. From the result, I found the contact energy was large. How can I find which contact makes the large contact energy? In LS-DYNA, each contact energy can be output separately. However, in Radioss, it seems that we can only output total contact energy through global variables. Best Wishes Roy
  3. Two bodies are connected by means of bearing (upper race and lower race bolted to respective bodies). Detailed analysis (ignore bearing model) is not required. What type of connections could be given between two components? Can we assume a block instead of bearing, and give what type of connections?
  4. Hey, I try to simulate a large displacement movement and have a problem. I got two simulations and want to evaluate the SPC-Forces, which are completely different, although the model is the same. The constraint is placed in the middle of the green component and connected to it, with rigids (see Figure). In the first simulation, the total displacement of the green component is 350mm (due to constraint) in x-direction. In the second simulation the total displacement is 50mm. When I evaluate the force-displacement plots and compare them, the results are completely different, which makes no sense. For example, in the first model the force at 50mm displacement is 6,7e+05 N. But for the second model, the force at 50mm is only 8,19e+04 N. But they should be totally the same to my opinion. Somebody any hints? Greets Elvis
  5. Hi all, I want to set up contact between two bodies in optistruct for modal and frequency response analysis, but I don't know how to do it? Is there any example for reference the detail process? Thank you Best Wishes Roy
  6. I am trying to simulate an autofrettage process with the optistruct solver but i am not able to get any plausible results. In theory the process and simulation should be quite easy. We have two parts: a swage and a tube. The swage (which has a slightly bigger outer diameter than the tube) is pressed through the tube which results into contact with friction and plastic deformation in the tube. I meshed both the swage and the tube (only one quarter of each and conditions for symmetry to reduce the calculation time), defined all the boundary conditions like constraints and the load (forced displacement of the swage) but somehow the contact condition doesn't work at all. I read several tutorials and have tried different combinations of contact-surfaces or set-entities which were linked by a contact interface. I tried the preset contact types like slide/freeze/stick as well as a contact property with MU1/MU2 coefficients. When I use slide or freeze (images below) I get extremely high deformations and it looks like the points where the first contact occurs don't separate anymore, In addition to that I don't understand how they can already be in contact at that point since the contact should occur later when the bigger diameter hits the edge of the tube. Displacement scale factor is always set to 1.0. When I use the contact property (pcont) the calculation takes forever and I don't get any results (no convergence). I already tried to increase the number of iterations up to 50 and NINC up to 25. I would really appreciate any helpful advice or maybe someone with experience could check my model file. test_12.hm
  7. Dear All, I try to do simple heat transfer simulation by following OS-1385. when I run the simulation I got Error 1000 message, I know that the CGAP material does not have material, but in the OS-1385, the CGAP also doesn't have material too. Please your advise. Best regards, Iron_man CASE01.fem
  8. Hi, I've started to use Radioss few days ago, and I'm performing an impact analysis on a vehicle component. Actually I'm not able to find the Autocontact tool (as in Hypermesh Optistruct) in order to set all the contact surfaces. Can you tell me where could I find it please? Thanks in advance
  9. Hey! I am trying to perform a structural and transient analysis on a Roller Element Bearing model. I am able to perform simple static analysis but I would like to utilize Hyperworks to simulate the following conditions: Inner race to be rotating with a constant velocity and a fixed radial load is applied. Outer race is fixed. The balls should also be rotating. I wish to know: 1. How I can give a constant velocity to the inner race of the bearing while also allowing the balls to rotate? Which card am I supposed to use? 2. What kind of contact constraint should I apply. Right now I am working with slide contact only. 3. Is quasi static analysis adviced or implicit non linear? There is one video but in a different solver which does what I have been trying to do. I wish to do it in Hyperworks. Here is the link: Also please suggest whether optistruct's non linear can be used or whether I should switch over to a different solver module! Cheers
  10. Dear All, can you please help me with, How to apply enforced displacement on shaft and fixed constraints on hub as shown in figure. i'm confused in load collectors, where to assign spc and where to assign spcd and in which collector. also want to know about search distance option what it means actually. is it a gap between contacting bodies? regards, Ganesh
  11. 3D model with solid elements, there are two surfaces in contact and friction interaction were set in Hypermesh. When .inp file was imported to ABAQUS and check data, there is a warning "the slave assembly has 1200 nodes in common with master surface". Should I separate the nodes on the interface and how to do it?
  12. Hello, Since the contact surface is deformed in the current analyses, I would like to use tracking system to obtain the projection of the contact forces on the element surfaces. I could manage to use tracking system for displacement but I could not find a way to use for vectors of contact forces. the toggle A picture of the issue I mentioned, is attached to this message. The swicthed that is written "use tracking system" cannot be activated as shown in the second picture, Thank you for your help in advance.
  13. Oli

    contact

    Hello, I want to simulate a rivet Joint just applied shear force. Between the rivet and the hole in the metal Sheets is a gap. I get convergence but the rivet turns a Little. u can see it if u watch the displacement Contour plot on the rivet which is not symmetric. Is that because of the coarse mesh? I tried to use gap elements but maybe i put some wrong Setting. attachted are the model. Can anybody help me to fix the Problem? rivet_joint.zip
  14. Hi Everybody, I would like to model a Contact-Friction anlayse between two bodies with a pressure load and relative velocity in two time steps. At first time and second time step I would like to apply a pressure At the second time step I would like to apply Relative movement ( with the presure along with friction applied)between two bodies. Please help me in this regard! Thanking You, Fares
  15. Hi, I have a problem with contact analysis. My model is working fine in one direction (let's forget about the connection between the bearing and the gearbox), i.e. the bearing pushes away the flange. However, if I change the direction of the force, in which case the bearing should slip out and has no effect on anything, the bearing still pulls the flange. What do I have to modify to make the bearing available to push the flange but not pull? Thank you aecyd bolted_flange.zip
  16. Hello! I've started using hyperworks a couple of months ago for my research and I still don't really know my way around as I have no previous experience in simulation software. I would like to do a contact analysis by putting two thin foam films (about 0.2mm) on top of each other and see how the impact distribution is different when I change the young modulus value for the top or bottom films. 1. Can anyone advice on which radioss (bulk or block?) I should be using? 2. Shell or solid? 3. And is there any similar tutorial that would be useful? I found "RD-2100:NLSTAT Analysis of Solid Blocks in Contact" but I'm not sure if it's appropriate for the analysis I am doing. What is NLSTAT by the way? 4. Any other related advice would be greatly appreciated as well.
  17. I'm trying to incorporate mesh independent 1D spotweld/rigid/beam elements between 2/more BIW panels via contact interface and seem unable to execute. Error: *** ERROR # 2371 *** SET SSID on CONTACT 1 is empty. (1D elements in slave set)
  18. Hello, I have updated the software from the 14 to the 2017.1 version and when I am trying to select the 2D elements to add to the BSURF group in order to define contact in a BCTSET card in NX Nastran user profile, no elements are selected. Is this a bug of the software or has there been a change in the way to specify contact of which I am not aware of? Thanks in advance.
  19. I have 2 parts forming t section whose midsurface is extracted which creates gap between the parts,to overcome the same i extended the one surface and projected on other , after meshing nodes gets merged is their any need to define contact between the parts as i want to fix these parts ?
  20. Which contact type is to be used for these body they are not welded only one is kept on other ?
  21. Hi All how should I choose the external surface of a spherical shape as a surface , when I also have meshed it ? I tried elements but the problem was that I could not use any option to select all the elements on the external surface, options like adjacent ,etc don't work
  22. Hi, I am trying to analyze the contact forces during impact using radioss. Do you have a pictorial representation or any documentation of Normal forces in X, Y, Z, Tangent forces in X,Y,Z and Total Forces in X, Y, Z? I also want to know whether the component of a total force components would be the addition of Normal force vector component and tangent force vector component? I could not find any documentation yet. Please help me out. Thanks
  23. Hi, Due to contacts in my model I wanna let my optimization run nonlinear. So far the linear analysis and optimization works. To let the analysis and optimization run nonlinear I created a load collector with the card image NLPARM. Additionally I created a non-linear quasi-static loadstep. The nonlinear analysis gives me results where as the optimization does not give any result even though I can let the optimization run without any error. Here I'm uploading a very simplified model that is compatible to the HyperWorks student edition. The contacts are not implemented yet. But there should be contact between the green, the yellow and the blue component. Maybe someone can tell me by which criteria I have to decide if the contact partner is master or slave. I'd be glad to get any advice how I can set up a nonlinear optimization with contacts in Optistruct. My question is: which steps do I have to carry out to turn a linear into a nonlinear optimization. Unfortunately I couldn't find that much information about it. Felix P.S. The model shows a medical implant for connecting bones. Maybe someone is wondering what it is Impl-Mandible-Fib-4S-Uebergang_vernetzt_1_temp13_Federn.zip
  24. Hi, I have two 3D parts in contact. I want to ensure matching nodes between the parts so that the contact is good in FE. How do I do that please. I am using tet elements. Thanks
  25. Oli

    LGDISP

    Hello, I have a Model with 2 Load Steps. I applied a force just in one direction with differnet magnitude . For load step 1 =4000N and for load step 2= 10000N. (I do not use CNTNLSUB) I wonder, why the force vs. displacement curve is not equal for both load steps until 4000N. So the stresse are actually also not equal at the same force magnitude. Do somebody has an idea? Attached a Diagram of the 2 curves (force vs displacement), and the model files .fem and .h3d kleines_Loch__plastisch.h3d
×
×
  • Create New...