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Found 92 results

  1. Is it possible to create contact between two surfaces edges in Optistruct? does it require a special interface type? I tried creating a contact interface with an element set for master and a node set for slave, but it doesn't work. The solver outputs this error: *** ERROR # 1762 *** Incorrect SET type for MSID This video explains how to do what I'm trying to do in the Ansys profile. I would like to know how to do it in Bulk data format. https://www.youtube.com/watch?v=Bx6JFiqeCmM Thanks in advance!
  2. Hello Sir, I'm working on bullet penetration into steel plate. At first contact works beetwen bullet and plate, but next it doens't work so good (picture 1). Finally, contact again work (picture 2) and I don't know where is a problem. On top of that, the speed of the projectile doesn't decrease (picture 3). Contact settings: Type 7 Istf: 4 Igap: 2 Fric: 0.2 Gapmin: 0.1 Inacti: 6 I tried a lot of contact setting, among others: Type 7 Istf: 4 Igap: 2 Idel: 2 Fpenmax: 0,8 Stmin: 1000 Fric: 0,1 Gapmin: 0,04 Inacti: 6 Iform: 2 but still doesn't work. Thanks for helping me. test21.hm
  3. Sp108

    Bearing Analysis

    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
  4. Dawnblade

    Contact in composites

    Dear Sir, I want to do a three point bending test of carbon fiber laminate in Hypermesh with Radioss. I found something puzzle when i create the contact between components after i had defined materials, properties (CFK using M25_COMPSH and property with it using P17_STACK), plies, laminate and some of boundary conditions. I chose TYPE 7 as the card image to let laminate be a slave entity and impactor be a mater entity but i found i cannot select my laminate component in the option(i can only see other component) Is there any mistake in my operation? Here are some pics under. I am exactly green hand in radioss, my apology... and I hope someone can help me on this.
  5. For Modal and Stiffness(torsional and bending) of ladder frame chassis, is there any significant difference in results when I use stick contact between frame and cross-members or when I use shell/rigid weld elements to connect cross-members and long members?
  6. 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.
  7. Hello to all, I'm trying to model a wheel that rotates on a plane without slipping, but that can lift off the floor when it's needed. I used the contact command and Poissoin's algorithm, but I wonder if there is another way to do it. Is it necessary to write a subroutine? thank you
  8. Ganesh Munge

    enforced displacement

    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
  9. I've been recently working on a Knee joint model . I need to find the contact force vector between two particular components. I have been getting a lot of errors and unable to run the model. All the contact pairs and properly defined and I am able to generate all typical outputs except for contact output. please help me out. The output blocks defined so far are node and element outputs for all 8 components defined. Thanks in advance!
  10. Ganesh Munge

    error id 55

    Dear All, how can i resolve it. im having all solid elements in my model. gap between two part is 0.2mm friction is 0.05 what additional parameters i need to choose in type 24. i'm doing failure analysis with JC material model regards, Ganesh m
  11. Dear All, Please help me out with mentioned errors.
  12. 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
  13. Vitte-pks

    Autocontact in Radioss

    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
  14. Hello, I have set a Nonlinear quasi static analysis (type NLSTAT) with two consequent load steps (using CNTNLSUB option). In my model two parts are gradually getting in contact (something similar as roller - plane contact), where also friction is taken into account. In the first step a radial force is pushing the roller towards the plane and in the second step additional lateral force is applied. Everything works fine, the results seem meaningful. Now I would like to set a first load step with contact type SLIDE and the second (continuous) load step with friction in contact. Is this possible in Optistruct? Thanks for your help! Best regards, Matej
  15. 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
  16. gopal_rathore

    radioss to optistruct conversion

    Hi, I am having a radioss bus structure file with min. element size of 5 mm used for crash simulation and now I want to use the same file for static and non-linear quasistaic analysis in optistruct If I go to optistruct will all contacts be detected as it is in radioss and is recommended this way or generate separate file for it. As the structure size is large, meshing will take more time and thus wanted to avoid making new file. Thank you
  17. 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
  18. Hi together, i try to visualize the contact forces (normal and tangential) of a type 2 interface in radioss. Is there a engine keyword to visualize the contact force as Animation, so that one can see it in hyperview ? I use Interface type 2 with spotflag 20. This means, that a contact force is calculated in order to compare the result to the rupture criterium. I would like to visualize this contact force. Thanks in advance! Greetings, Sebastian
  19. Eugen

    Contact surfaces

    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!
  20. ank

    Type of Contact

    Which contact type is to be used for these body they are not welded only one is kept on other ?
  21. 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)
  22. Enrico

    Irregular contact force

    Good morning, I am modeling a rotor composed by three components: shaft, magnet and surrounding fiber. I would like to evaluate the effect of thermal expansion, simulating the contact between the three components. I have some difficulties with contacts (the contact force is not constant, as expected). Differences are quite small, but I would like to ask you if there are any errors in my model or if there are any possibilities to obtain better results (I have already tried with s2s option in contact definition and with expertnl param). Thank you so much for your kindness Enrico
  23. 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
  24. frzti

    Contact definition and Type 7

    Hi all I was watching a video on youtube , where the contact creation brings the user to choose among the Contact Type 7 or Type 11, but what I see in lower versions is just CONTACT, GROUND, CONVECTION ,...etc I would like to know how to choose the Contact type in versions 13 and lower
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