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Found 125 results

  1. 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
  2. Hi all, I would like your opinion for a quassi static analysis I am performing that includes 3d contact between a rectangular plate with a bolt hole fitted, a bushing that will be inserted with an interference fit into the plate's bolt hole and an external load. I am thinking to perform the analysis in two steps: First, calculate the stresses from the interference fit of the bushing (no external load). Second (continued from the first step) apply the external load (can be a force, or a pressure load). The question is: what kind of boundary condition will be applied on the bushing during the second step to "lock" it in place to ensure that the bushing will not move in the vertical plane or exhibit a rotation of some kind? Do we need to apply any BC to the bushing? Thank you for advance for your assistance.
  3. Hello everyone, I would like to learn the duty of "clearance" in PCONT card. In Hypermesh help it says: "Prescribed initial gap opening between master and slave, irrespective of the actual distance between the nodes."; but that does not explain anything for me. Could anybody tell me in a detailed way, what happens when i use clearance section in PCONT card for contacts. Thanks in advance.
  4. Hi everybody, There is someone here who has tried to implement (code) new contact laws in OptiStruct ? Best regards, Farouk M,
  5. Hi everyone, Anyone here working on the modelling of the roughness / wear on macro-scale FEM model ? Best regards, Farouk
  6. Hi, I would like to know, how to get the script to get the elements in contact (spotweld/tied) in dyna by giving only a node as input. The command file does not give clear steps except for *findmark elements 1 1 1 etc.. or findfaces for getting the solid weld element faces. I tried it manually but beyond getting the solid elements, I'm not getting the 2D elements which are defined in contact spotweld. What must I do to get them too ??.
  7. Hello, When NO clearance is specified in contacts, what is Optistruct criterion to differentiate of an open and close contact? Thank you!
  8. Hi, I want to find the theory manual about interface type 24. Where is it? Thanks
  9. Dear all, Lately I am having some problems solving a problem that might seem "trivial", however I am still having problems getting some meaningful results. As seen from the files attached, the problem consists of two aluminium plates connected with a steel bolt and a bushing. There is a press fit of 0,2mm (if I remember well) between the bushing and the two plates. The upper plate has one of its sides fixed and a compressive force of 90 kN is acted on the lower plate. Although I have simulated the contact* between all components (plates, bolt, bushing) and ran a quassi static NL analysis, I keep getting extremely high stresses at the area seen on the attached picture. It is probably some mistake with the contact there but I cannot find it. Please have a look on the attached .hm file. There are no contacts defined to allow you to use your own approach to the problem. You can use any of the latest HM versions to setup the problem. Thank you in advance for your kind assistance. *: a number of approaches used: friction, no friction, slide, freeze etc. bolt_coupon.hm
  10. Hi All, by selecting 2 components , can we find surface area of both component close to each other with some tolerance to create contact. is there any direct API? any one having any idea regarding this? @tinh @Imoto @vipin Regards, PD
  11. Hi everybody Is there anyone here who has tried to model and run contact simulation using rough surface (see the picture ) ?? Cheers,
  12. Hi, I want to know if what I thought is correct. The interface setting of two shells is as follows. Top shell is 1T and bottom shell is 3T. Distance between two shells is 2mm. -> No initial penetration Igap determines how the size of the gap is calculated. Igap = 1 Then, in my model, Variable Gap = 2 And then my question is as follows. In this model, if Gapmin is 1.5 , contact force is applied when distance between two shells is 1.5 below figure?? (when 1.5 < distance between two shells, contact force is not applied??? ) Thanks
  13. Hi, I learned that when initial penetration is too deep, Fpenmax is applied. 'The node stiffness is deactivated if the Penetration ≥ Fpenmax * Gap, whatever the value of Inacti.' In above sentence, 'Penetration' is only initial penetration or any penetration? Thanks.
  14. Hi, I use /TH/INTER to obtain the contact force. In Radioss help, variable group is as follows. However, In Radioss, variable group is below. Which variable is absolute value? Thanks.
  15. Hi, In RADIOSS theory manual, Interfaces solve the contact and impact conditions between two parts of a model. In RADIOSS, It seems like that types of interface consider impact. I want to model the interface except impact. (only consider stick, slide) How can I do that? Thanks
  16. I am using HM 17.2 (Optistruct) and have no Radioss. My problem is using Contact in Optistruct. Somehow I can't get the result I am expecting because of the problems I have in my model. The contact doesn't seem to function the way I want it to be. There are errors that I don't get. Some errors are: *** INFORMATION # 4739 The structure of surface-to-surface contact element is quite different than that of node-to-surface contact element. No internal CGAP/CGAPG elements are created for surface-to-surface contact. *** INFORMATION # 3433 MUMPS solver is used by default for nonlinear analysis at subcase 1. I have only 1 version of HM and have only Optistruct too. Educate me please JDN_Loading_Beam_Rev_B2.hm
  17. Hi, I've a problem with my 3PB model of a sandwich structure (honeycomb core). Contact between sandwich structure and supports isn't realistic. I set contact in "SLIDE" but the result is wrong. So I obtained a displacement of 177 mm with a force of about 15000N, not real. I can't also view the results of CFAILURE, but I've set it in output requests. Can you take a look to my model? Thanks in advance. Hearing from you. Regards. 3PB_1.hm
  18. Hi everybody, I was running a test with optistruct using two simple cubes. They are both fixed at opposite ends. Their faces are separated by 0.1 mm and can, if pushed, become engaged in a contact (type SLIDE). Type of analysis: nonlinear quasistatic. Issue: Even if I fixed both cubes at their bases and there is no applied force and no contact is engaged (shcdist=0.001 and the solver warns me that no contact elements have been defined during the analysis), the cubes translate of 2 mm as if they are moving like rigid bodies. I have already tried to constrain some more nodes, to no avail. Any explanation for this thing by anyone? Thank you in advance. Find attached my .fem file to check SHRCTOL001.fem
  19. Hi all, 1、For a problem with large deformation, the contact status between two objects will change. Some location will come into contact while some other location will separate. What's more, relative sliding may also exist. How to choose the proper parameter values in contact property card for this problem? 2、If a linear static analysis is chosen, could the contact status change during deformation process? Roy
  20. Hi all, I was running a model in Optistruct 13.0 dealing with a two step non linear quasi-static analysis of two plates coming into contact. In the first step my goal is to make sure the two plates don't come into contact; let's say my initial gap is 5 mm, one plate is pushed down by a force of 100 N, the other one is fixed at the base. At the end of this step the two plates should have minimum gap between them, in other words no load should be transferred from one to another. After the second step in which I apply a force of 1000 N, the two plates obviously come into contact, resulting in a load transfer to the spcf applied at the base of the fixed plate, since friction between the plates is activated. I tried using a gap element in order to simulate the problem but no matter how I change the values into the pgap card (for example I first put a value of Kb equal to 25 N/mm to make sure the pushed plate didn't reach 5 mm of displacement with a force of 100 N.... didn't work, then I put it equal to 0 and I obtained the same result ), at the end of the first step the gap of 5 mm is always reached, resulting in load transfer. How can I avoid this situation in order to make it work properly? I'll attach the .hm file so you can check it. Thanks for any replies, hope someone will help me with this matter! model_with_gap.hm
  21. 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
  22. Dear everyone, I have some problems about setting up contacts for two bodies with zero Gap at initial time. Type 7 was used, and two brick solid components were set for slave and master. An error message was received as follows: INTERFACE NUMBER. . . . . . . . . . . . . . 2 INTERFACE TYPE. . . . . . . . . . . . . . . 7 GAP MIN = 0.3000000000000 POSSIBLE IMPACT NUMBER: 77 (<= 1 *NSN) ** INITIAL PENETRATION = 0.3000000E+00 IMPOSSIBLE TO CALCULATE NEW COORDINATES OF SLAVE NODE 380483 ERROR ID : 612 ** ERROR IN INITIAL PENETRATION IN INTERFACE DESCRIPTION : -- INTERFACE ID : 2 -- INTERFACE TITLE : DiPao_WaLengZhi INACTI = 0 SLAVE NODE 380483 IS ON THE MASTER SURFACE ** INITIAL PENETRATION = 0.3000000E+00 IMPOSSIBLE TO CALCULATE NEW COORDINATES OF SLAVE NODE 377618 How to deal with this problem? Could anyone give some advice? Thank you!
  23. Hello, 1. I try to simulate a high detailed model of a screw with OptiStruct. Currently the screw will be pretensioned with the pretension function and in the next LoadStep it will be rotated. Now in the following LoadSteps i want to add enforced displacements on the Contact Surface of the screw head. My main problem is the sequence with the enforced displacements. How can every single Loadstep use the results of the previous Loadstep (Stress, Displacement, Contact...)? For the pretension Loadstep i use the function STATSUB(PRETENS), but i dont know if the displacements will be freezed for the next Loadstep and i use CNTNLSUB to consider the contact. 2. The next poblem is, how can i enable/disable contacts between severally LoadSteps without using MODCHG (Older Version of OptiStruct than 14.210)? Thanks!
  24. Hi, What is the best contact type generally? if the answer is type7, what is the best properties of type7 contact?
  25. Dear All, @Prakash Pagadala in attached image green- housing yellow - shaft blue- ball ball makes a contact with shaft at 2 points and with housing at 2 points. at every contact there is an interference of 3 microns. housing is fixed and shaft is allowed to translate axially. i tried contact with static coefficient of friction and and clearance value but still groove surface of shaft and housing is penetrating the ball and vice versa. can anyone suggest how can i work on this??
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