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      Please click here for a short but important announcement   03/26/17

      Dear Users Our Commercial and Academic users around the world can use these same forums here as before i.e. the Altair Support Forum , Commercial users from India with solver queries can go to the Solver Forum for India Commercial Users , Academic Users from India and AOC India Participants are requested to go to the Forum for India Academic Users and AOC India Participants , We will be tending to all queries in all the forums promptly as before, thank you for your understanding. 

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Found 61 results

  1. 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
  2. ERROR id : 475

    I want to know what this error mean when i used comp in interface definition of contact: ERROR id : 475 ** ERROR SURFACE BUILD FROM SOLIDS PART NON AVAILABLE OPTION /SURF/PART/Surf_ID FOR CREATING SURFACE 6 FROM A PART OF SOLIDS ;
  3. matching mesh

    I want matching mesh between two faces of different component. How to do this in simlab?
  4. Contact

    Hi, What is the best contact type generally? if the answer is type7, what is the best properties of type7 contact?
  5. Contact Penetration

    Hello, i am simulating a contact (slide) between a pin and a lug. At the beginning of the motion everything is fine, but at the end the pin is penetrating the lug. The pins displacement is implemented with a constraint. I already tried to change master and slave, but it didn't work. I have no idea what to do next, do someone have some hints maybe? I attached a screenshot of my card settings and the movement of the pin.
  6. sir, where can i find full vehicle file of taurus for crash in radioss forum?

  7. Friction Heat

    Hello there, basically I am doing an analysis of our brake disc for formula student in radioss. So far the structual part works and the energies look fine. The next step is to get the thermals in there. In the documentation for the type7 interface there exist an Fheat. But I can't find it in Hypermesh. So my Question is whether the enegry transformation into heat is working or not if only I_the is activated. Another strange problem I am facing at the moment is that if i define a starting temperature in Ti and T0 (~300 K) the results still show me 0 K. By the way I am using Block 120 because on the cluster only 120 is installed. Looking forward for some help.
  8. Contact Thermal

    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
  9. Hi, I am wondering if somebody could help me defining contact between to surfaces so that I can easily update the contact definition in the input file. The problem is stated as follows: I am pressing two beams together and would like to perform FRF modal analysis on the beams. With an optimization routine, I would like to update the contact definition between single nodes and surfaces to be either stuck, slipping, or not in contact, and match an experimentally obtained FRF. In order to solve this problem, I need to define the contact in a way that I can easily update the contact definition between single nodes and surfaces in the input file. In this initial analysis, I define the contacting interfaces to be stuck and am hoping to understand the input (.fem) file, hoping to be able to figure out how tho change the contact definition from stuck to slide within the .fem file. Attached are the .fem file and the .hm file. Could you explain to me the entries in the .fem file in: Line 61 (+ 21603 13616 13929 1) Line 1762 to 1778: How is contact defined here? Is it between the sets of nodes? Can I change that to single nodes? Is grid data the nodal position? Is CHexa Data the element definition? I hope this description is sufficient to help me solve my problem. Thank you, Kevin 170706_FRF_HZBeam_FullyStuck.fem 170706_FRF_HZBeam_FullyStuck.hm
  10. Fricional contact analysis

    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
  11. Hi, I am working on a laminate optimization. I'd like to do the three phases: Free Size Optimization, Size Optimization and Shuffle Optimization mentioned in the composite manual. My question is how can I connect the element faces in the 3rd direction with other elements of different components. In the attached picture I would like to connect the yellow part with the different laminate layers. Are there any solutions available, I could not find equal problems in the composite manual. thank you in advance, Martin
  12. Hello, I am trying to build a rigid mbd model with rigid bodies engaging in 2D rigid-to-rigid contact. I have defined curves where the contacts will occur, using the Add Curve functionality. Attached images 1.png, 2.png and 3.png from my curve panel, showing the settings I am using for all three contact curves. As you can see, in the Z direction, they all have the same value as 0. So they are indeed coplanar as they all line on the XY plane. I proceed to define a 2D rigid-to-ridig contact. Attached image, contact.png, shows my settings for one of the contacts I use. I have also made sure to correctly define the contact sides; so there are no problems there either. Finally, attached image, error.png, shows two of the error messages I'm getting. All my error messages are the same so I am only showing those two. It is telling me my curve graphics are not coplanar. However, what it seems is that they actually are indeed coplanar. I would be grateful for any help to fix this problem. Best regards
  13. Hello, I'm modelling a complex structure in Hypermesh with Nastran profile and I need to connect two components. One is a tube meshed with pshell elements while the other is a solid meshed with psolid. The tube is perpendicular to the solid surface but I cannot have the same mesh for various reasons. In Abaqus I would use a tie constraint between the edge of the tube and the surface of the solid but I can't understand how to do so with Nastran and Hypermesh. I tried to use the cards BSURF, BCONNECT AND BCTABLE but I'm not able to figure out how they works. Any suggestions would be highly appreciated. Thank you! Stefano
  14. Contact modeling of gears

    Hi, I am doing spur gear to spur gear transmission analysis on motionview (gears have module 1 & teeth of the gears are 28 and 82). I used the rigid to rigid type gear contact and used poisson model with parameters as ,penalty = 1000, COR = 1, Normal transition velocity = 1mm/s to define the contact. I gave uniform rotational speed to the gear with 28 teeth and i requested for the output of rotational speed of the gear with 82 teeth. Theoretically i should be getting output plot to be a straight line with slope 0 & 1.024 rad/s (marker velocity) above x axis (time), but i am getting a curve which is not throughout straight line, plot shows a max peak of 7 rad/s velocity as well. What could be the issue for this?
  15. Modeling of an large bearing

    Hello everybody, I'm a Student and have to do a thesis. The thesis is about a FEA about an large bearing. But I'm a beginner in Hypermesh. Does someboby has some tips for modeling of the isssues "initial bolt prestress", "hertzian stress" and general Information which is important to consider?
  16. Hi everyone, I have problem obtaining the TCL command of auto contact pair finding. My model contains 6 components, I use the Abaqus contact manager to automatically find contact pairs for me. Manually, I can successfully find contact pairs. Since I want to run this process automatically by TCL script, I do the process manually and check out the code added in the command.cmf file. Unfortunately, the code are very long, approximately 50000 lines. Also, the code are about nodes' data and surface set, which is not I am looking for. I am looking for the command that represents the buttons "auto", "components: all", "find", "create". I will show these buttons in the figures attached. By the way, the file: raw.hm is my model. Again, my goal is to get the TCL code for finding contact pairs. Please help me, thanks! raw.hm
  17. Skid Loader Attachment Analysis

    Hi everybody. I am designing a rapid attach system for the bucket of a skid steer loader (see picture below), taking inspiration from the commercial systems. In the second picture you can see how this system work: there a contact surface between the bucket and the tach. So there is a contact zone and of sure I should do a non-linear quasi static analysis; however since I would not do a non linear analysis I ask you if there is another way to get a solution. I've already done a non linear analysis but I can't validate the results since this kind of analysis should be quite instable. So I'd like to find another way (with linear analysis) just to compare the results. Thanks in advance for your help Best Regards Stefano
  18. Time step smaller than DT/INT/DEL

    Hello, I am doing a study inflating an airbag with a particular shape and there are a lot of contacts between surfaces, that I modeled with interface type 7. I have some troubles because there are some nodes that pass through master surfaces (even if the interface is activated) but then the contact is applied and the nodes can not pass through, creating high contact forces and reducing the time step. I wanted to use the control card DT/INT/DEL to delete the interface in those nodes, I fixed Tscale to 0.9 and Tmin to 1.0 e-4. When I run radioss, time step reduces up to 5e-5, some nodes are deleted but not those that passed through surfaces and have high contact forces. Any idea about how can I deactivate interfaces in nodes where the contact force is higher than a fixed value? Thank you
  19. Contact Verification

    Dear All, Could you help me to verify, is my simulation valid or not? I do not know because this is first time I use contact in hyperworks my material is steel, with mechanical properties : 1. E = 205000 MPa 2. Poisson Ratio = 0.29 3. Density = 7.85E-6 kg/mm3 4. Yield Strength = 490 MPa 5. UTS = 686 MPa The .hm files is in attachment. Thanks and Best regards, Iron_Man Contact_001.hm
  20. Hello, I have been having issues with a model containing contacts and friction. The model is relatively straight forward, a multiple mast model with wearpads and contacts between pad faces and adjacent mast sections. When the contact is set to property type slide N2S, the analysis demands around 47GB for In-Core Solution. However when the type is set to static friction coeff = 0.15, the in-core demand becomes 80GB. The model on my pc then typically fails because MUMPS demands significantly more RAM. I've tried adjusting the search distance and using a PCONT card to define friction with little impact on MUMPS demand. Any suggestions? I currently have one PARAM card... PARAM,EXPERTNL,CNTSTB
  21. Contact in MSc Nastran profile

    How to define a contact between two surface of shell elements in Nastran profile? Which card image i should use? I created slave and master elements using contact surface collector . Am doing linear static and normal mode analysis.
  22. 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
  23. I am trying to simulate a quasi-static (NLSTAT) contact problem using Optistruct. I apply a constant displacement on a rigid cylinder which is set apart from a deformable body. The deformable body starts to deform from the beginning of the simulation without contact. As soon as there is contact, the simulation stops without an error message before the prescribed displacement is achieved. What possibly am I doing wrong? Can I use a composite (PCOMPP) as the deformable body in this case? I don`t remember exactly the message but I received an error saying that I could not use it. Also, as i understand from the manual, SLIDE is used for small sliding condition. What should I use if I have finite sliding? Thanks
  24. TH/INTERFACE Output Forces

    Please let me know the difference between NF-Resultant Normal Force and Resultant Force. Also what is difference between FX-X Total Force and FNX-Normal Force. I got this values from Radioss Interface output forces. Please let me your comments. Thanks and Regards, Yuvaraj
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