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    • Rahul Ponginan

      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 7 results

  1. Hi, I m working with beam analysis. The beam consists of three small assembled sections. I have created contacts in Optistruct profile and exported in Nastran profile (.dat file) because I have to do analysis in MSC Nastran (client requirment) but the contacts were not exported in the .dat file. Is there any way to exported these contacts in .dat file? Nastran profile doesn't supports contact formation.
  2. Can anybody help me with creating contacts in hypermesh NASTRAN profile? Previously I have tried to export .dat file from hyermesh to MSC NASTRAN but got excessive pivot ratios error.By using PARAM,BAILOUT,-1command i got the results but the beam was broken from the contacts.
  3. Contact Forces split up

    Hi guys, I am currently trying to solve a problem with my 3 point bending setup. I designed a hybrid composite structure with 3D elemtents as core and 2D elems as Laminate. To apply the load I have modelled a 2D Impactor which moves down and translates the forces into the laminate via contacts. (MORIENT: Norm, S2S, TRACK: finite) Everything works fine exept my results... if I view the contact forces Optistruct would give me the result as shown in the picture. Has anyone had this problem before? I have already tried using CNTSTB and defining the SRCHDIS. Changing Master and Slave or N2S and S2S did not help either. At some values the two lines of contact forces would move closer to each other but never close enough. Greetings from Germany Lars
  4. Hi, I am using hypermesh v13 and optistruct v13 for bolt pretension analysis (Non linear Quasistatic analysis) for 4 cylinder inline engine. Components consist Cylinder head , head bolts , gasket and Cylinder block. Head bolts are inserted and they pass through cylinder head--gasket--cylinder block. Internal threads are present in block and external threads on bolt. will you please tell which type of contact should be used for contact between cylinder head bolt and cylinder block for optistruct solver ? There must be relative motion between them...right ? please give explaination too so that I can understand.
  5. Optistruct Contact - Fatigue

    Hi Everyone, I am working on project to carry out contact stress and later to do fatigue analysis. I am using Optistruct for this analysis. Image_01 shows how parts are assembled to each other. Image_02 & 03 shows that area of contacts I am interested in. I have attached .hm file for review. Can someone please guide me for how to define contacts between, 1. Inner diameter of housing to Outer diameter of Bush (Press fitted Bush) 2. Inner Diameter of Bush to Shaft diameter. (Shaft rotates on Bush ID) 3. Face of Shaft collar to Face of the Housing. Model is constrained at the Bolt location and Load of 200 Nm is applied at the center of Shaft. Aim is to Study the contact stress at Press fit area, Bush ID and Side face of collar of the Shaft. For Fatigue analysis, I would like to check if 200 Nm Load is applied at interval of every 2 sec, what would be the life of the Bush? Regards, Jagdish Shaft_bushing.hm

    i am doing linearstatic analysis in optistruct.i am facing problem in giving contacts.i tried in several ways like set 1 as node set 2 as elememts.and another combination like set 1 as element set 2 as elemets similarly both set1 and set 2 nodes.we are getting same error for every combination below shown. *** ERROR # 1762 *** Incorrect SET type for MSID on CONTACT 1. . please find the alternate solution to resolve this problem.
  7. Hello! I am currently working on the analysis of a two piece wheel hub for a wheel hub drive. The model contains apart from the mesh a few contacts (some of them with a negative clearance for bolt pretension) and springs to modell the stiffness of the wheel bearings. My problem is that the analysis does converge pretty well but there are no results attached. I already tried to define several ouputs with different options but I never got results. If I just change the load step to "linear static" and run the analysis there are results. Did someone have the same problem already or does someone have an idea what could be my fault? I am working with HW 13 and Optistruct. Many thanks in advance! Regards, Max