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Found 123 results

  1. Dear All, Please help me out with mentioned errors.
  2. Hello every body here, this forum is really helpful, just keep the good work ! I know that in general contact problem is non linear BUT i would like to know if it is possible to perform "linear analysis" with optistruct when the contact interface type is set to freeze or tie ? Thanks a lot. Best regards, GAYE
  3. Hi there, Is it possible to define an initial contact between to surfaces in HyperCrash, while running RADIOSS, so that there isn't neither a gap nor an initial penetration? Thanks
  4. Hello, everyone! I am a beginner for Hyperwork and using Optistruct to solve some problems. I have a question to define the contact between rule and cylinder just like in the picture. Because of the load in the middle both side of the rule will go up. How could i define this simple support contact in Optistruct? Thank you very much!
  5. Hi everyone, I'm trying to model a cylindrical section being held between a grip that tightens around it. When I look at each jaw however, I have a contact pressure concentration in one area and I can't seem to find out why. I'm using Optistruct V13 and I use the auto-contact tool to create the contacts between each component. I have checked for penetration between these components and there is none (there is between two other pieces but I do not look at these). I have quite a fine mesh as I'm looking at this specific area (mesh size 0.5mm). Does anyone know what I could do to get rid of this point? Could it be that these nodes are slightly irregular and 'sticking out' slightly from the component? Thank you for any help you may be able to give me!
  6. hello, everyone ! can anyone share the related Gallery model file ? (optistruct 14.0 new feature)
  7. Sir, I have a component which is an assembly of 3 different parts. It's a torsional vibration damper consisting of inner mounting part and outer rim both composed of metal which bounded by a rubber part in between them. I want to perform a linear static analysis of the assembly with loads applied on the inner part and constraints applied on outer rim. I have meshed each part with perfect alignment with the adjacent part mesh at the contacting surfaces (so that the each node at the contacting surfaces will be commonly shared by the adjacent parts). The parts are meshed with solid mapping of 2nd order quad elements. Also I have checked that there are no free edges in between the parts contacting region. Being different parts (material), I have applied separate property collector to each one of them. What else should I need do to avoid an unconstrained linear static analysis simulation? I mean how do I convey the software (solver) that the inner and outer parts are bound mutually through the rubber?
  8. Dear all I post for the first time. I'm Takky, Yokohama National University in Japan. Could you please tell me how to output the load force of side members and the barrier surface in contact analysis? I need its graph. I can't output the load force data of the barrier nor side member. I once used the output block on each RBODY of the barrier surface and side member, but no data was output. On HyperGraph, only "Global Valuables" is available, but no other data in "T01-file". In this analysis, the bumper model crash into the rigid offset barrier surface in front, in initial velocity of 50km/h(13.9mm/s). The analysis sample on this image, I wanted to output the each load force of right and left member, but couldn't. In another analysis, I made one rigid body from two members and tried as equal, but couldn't. So, it's not because there are two rigid bodies in rear of bumper, I think. I sent its HM data together. Any ideas?? bumperA_inivel_2.zip
  9. Hello, I would like to have your expert opinion in one of the problems I am currently working on. Part of the simplified geometry is shown in the attached picture. As seen I have two cylindrical parts in contact with an interference fit of 0.001 inches. In addition to that a pin is installed and goes through (with a size to size connection) both cylindrical parts. I decided to perform a quasi static non-linear analysis, firstly by solving the interference fit and pin connection load case and then continuing with the load on the structure as a second load case. When I solved the press fit problem (without the pins), I had no problems, both the displacements and the stresses looked reasonable. But when the pins are included into the solution I am having a band of peak stresses (well beyond the material's yield point) where the pin contacts both cylinders (see red oval in the attached pic). This happened with almost every type of contact connection I tried between the pins and the cylinders (freeze, slide, friction etc). Same results when I replaced the 3D pins with 1D elements with RBE2 connections (to connect them with the cylinders). One solution is to ignore the pins and continue with my solution and then perform a detail stress analysis of the pins based on my results, but before doing so, I would like to know that I have tried all possible scenarios with the pins' contact. Any suggestions? Thank you in advance. pin.bmp
  10. 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.
  11. 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!
  12. 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
  13. 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?
  14. 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
  15. 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
  16. 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
  17. 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
  18. 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
  19. 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
  20. 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
  21. 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
  22. 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?
  23. 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.
  24. 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
  25. 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
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