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Found 120 results

  1. Hi, I want to find the theory manual about interface type 24. Where is it? Thanks
  2. 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
  3. 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
  4. Hi everybody Is there anyone here who has tried to model and run contact simulation using rough surface (see the picture ) ?? Cheers,
  5. 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
  6. 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.
  7. 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.
  8. 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
  9. 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
  10. Hi there. I hope someone will help me finish my model. I am analyzing a beam that will move the entire wind tunnel support jacket. See first picture. This beam is placed on top of the SPMT truck. See second picture. My question is: A. How to I model the contact between the top of the long beam and bottom of the bracket (second picture denoted as A). I am getting an error "Undefined SET SSID on CONTACT 1" but I already defined it. I don't know what am I missing. B. The boundary condition will be placed at the wood locations. This will be in compression only condition. How do I model that? I am attaching my model (only half have been modeled yet). JDN_Loading_Beam_Rev_A.hm
  11. Hello I am using RADIOSS to simulate a crash test which I have previously done. The trajectory of the impactor before impact is complex and requires several linkages and mechanisms to set up. The area of interest is the post-impact behaviour (stress/strain) on the target component, as well as the trajectory of the impactor. When I run the impactor by itself, to see the launch trajectory, I get a reasonable run time of about an hour. When I run the impactor with a simplified initial velocity + the target with all the contact and failure cards defined, I get a reasonable run of about 3 hours. When I run the full model: impactor with the initial trajectory + the target with all the contact and failure cards defined, I get a run around 12 hours to reach the impact, and another 12-24 hours to get results from post impact trajectory. I believe this is partly due the finer mesh required for the target model. I was hoping there is a way I can split the analysis in two, using the results from a the first as an initial condition for the second. Consider the following scenario: Model A: Simple model with only what is required to set off the trajectory of the impactor. The target is not modeled. Run from T=0 to T=T_impact. The run is stopped at the moment where the impact would have occurred. Model B: The target, with finer mesh and contact and fail definition is introduced, and the analysis is "RESTART" picking up from where Model A left off. In other words the target (with finer mesh) only appears just before impact onwards. This should theoretically cut down the majority of the analysis time. Is there a way to set up a RESTART file with introduction of new elements / properties / fail cards, and linking it to a "Stopped" run? I hope the diagrams attached illustrates what I'd like to do. Please let me know if there is a way to do this. Thank you. Best Regards, MN
  12. Good morning, I'm running a transient analysis of 2 gears (one of them with a preload and the other one with an imposed rotation). When I run it with Optistruct I get 2 problems: *** ERROR # 4965 *** Maximum number of time increment cutbacks reached, analysis aborted. The biggest problem comes here, if I analysis the results, the contact status is 0 everytime. The gears rotate but they don't seem to have a good contact. Moreover, I get high normal contact forces at points where there should be any contact (see image attached). I also attach the .fem to make it quicker and the .out from the previous simulation Thanks!! 1107rem.out 1207manana.fem
  13. Good morning, I'm running a transient analysis of 2 gears (one of them with a preload and the other one with an imposed rotation). When I run it with Optistruct I get 2 problems: *** ERROR # 4965 *** Maximum number of time increment cutbacks reached, analysis aborted. The biggest problem comes here, if I analysis the results, the contact status is 0 everytime. The gears rotate but they don't seem to have a good contact. Moreover, I get high normal contact forces at points where there should be any contact (see image attached). I also attach the .fem to make it quicker and the .out from the previous simulation Thanks!! 1107rem.out 1207manana.fem
  14. Hi, I have two main questions (for now) 1) I have define an advance joints between two bodies and is there a way to define the contact force between these two bodies without using the 3D or 2D contact simulation? 2) what does it mean when i define output-force-body and how can i see the result in hypergraph or hyperview? thanks for the help!
  15. Hello, I want to simulate the following mechanism I need the orange pin to slide trhough the green slot when the green slot moves due to other machanism movement. This is the configuration of contact that I used: Nodes on the all arround the slot are the slave and all of the pin elements (membrane of a 3D) is the master. And the results are these: what do you suggest i can do? What is wrong with my contact card, or what other approach do you suggest? thank you for your itme.
  16. Hi, What's the difference between the contact properties (Normal force) in Motionview. i have tested Impact and Volume model and the contact force between the two are different. Which should i take/use for the Simulation. thanks in advance.
  17. Hi, I am trying to launch an optimization on Inspire but I am always getting this error about unrealized contact: # -------------------- Progress Tracker -------------------- hwfdmfeprocessor process id = 15200 # Opening Model # Model opened successfully Client = Inspire 18.3 10526 Name = ADCS_V9_Config5_Tests7_2 Maximiser la raideur Masse 25% Fmin 100 Hz (9) ModelName = Model stmodOffsetId = 2 # RunType: OPTIRUN_ANALYSIS = 1, OPTIRUN_TOPOLOGY = 2, OPTIRUN_TOPOGRAPHY = 4, OPTIRUN_SHAPE = 8, OPTIRUN_GAUGE = 16, OSSMOOTH_REANALYSIS = 128 RunType = 2 # Using CAE_HOME='C:/Program Files/Altair/2018/sTInspire2018.3/hwx/bin/win64/' # Time 17:17:59 RUN_STATE = 1 ## Run started # Time elapsed - '6' Seconds <==> Total time taken - '6' Seconds RUN_STATE = 3 ## Generating fresh mesh/Using old mesh #--------Generating fresh Mesh RUN_STATE = 7 ## Meshing completed successfully # Time elapsed - '1511' Seconds <==> Total time taken - '1517' Seconds RUN_STATE = 15 ## Realizing model #--------Unable to realize contact (Contact 50) as UdbSet for Primary features can not be created #--------Unable to realize RUN_STATE = 527 ## Synthesis run completed successfully # Time elapsed - '68' Seconds <==> Total time taken - '1585' Seconds # Error - Unable to ralize synthesis data RUN_STATE = 1551 ## Done # Time elapsed - '1' Seconds <==> Total time taken - '1586' Seconds # --------------------- END ----------------------- Could anyone explain me what the problem might be ? Because in my model the contacts seem ok (those are default contacts obtained after using boolean substractions of non-design spaces on a design space volume to avoid intersecting parts) Thank you in advance,
  18. hi, i have created a 2 3d rigid to rigid contact, but when i try to run the calculation, this message log Shows for the two contacts. i have checked the model in Hypermesh, there is no free edges or red line in the so called model or geometry.
  19. Hi guys, Lets say I have a design space modeled as a geometry file. I have a set of cylinders modeled as 1D Beam Elements which should all lie within the design space box. The idea is to use a contact adjustment calculation (=contact initializatio) between the cylinders and the design space. I tried to model it with a two contact surfaces but the elements (1D) are not valid.... is this even possible to do with Hypermesh? I wrote the problem with illustrations into the attached .pdf file. Any help is greatly appreciated! Thanks! Merula contactProblem.hm ContactProblem.pdf contactProblem1D.hm
  20. 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
  21. Dear All, I'm using HM as a pre-processor and optistuct as a solver. want to simulate following condition shaft of size =10.000 mm and housing = 9.999 mm(interference of 1 micron) when i'm trying to rotate shaft using motor by keeping fixed housing. 150 degree temp is generated. want to observe the effect of temp on contact pressure and deformation of housing ID and Shaft OD. model is setup is done as per NLQS. what extra i need to incorporate to observe above effect regards, Ganesh
  22. 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
  23. 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
  24. 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
  25. 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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