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Recent content by ysg519

  1. ysg519

    Import Data from excel sheet

    cibachrome, I have attached a sample file to show the kind of data I have in it. I want to import this data into a matrix in matlab. Once imported into a matrix say A, I would like to access the elements of this matrix irrespective of it being a number or a string. I hope that is clearer now...
  2. ysg519

    Sequentially Coupled Analysis

    mizzjoey, Thanks for your suggestion. Unfortunately I don't have access to Hypermesh so I guess I am stuck with Abaqus :(
  3. ysg519

    Sequentially Coupled Analysis

    Thanks Corus, Yesterday I changed the step to initial and it worked and your message confirms it. I continue to get negative eigen value errors. Is contact a problem even with linear tetra elements like C3D4? My model is a little complex I tried meshing with hex elements but partitioning the...
  4. ysg519

    Sequentially Coupled Analysis

    Corus, as per your advice I will use C3D10M for stress/displacement elements and DC3D10 for thermal analysis. Right now since I think there are problems with overclosures I am trying to get the structural analysis part right by applying simple pressure load. I have constrained a surface in all...
  5. ysg519

    Sequentially Coupled Analysis

    Right now I am trying to simplify the model and do only a static analysis of the assembly. In the message file I get this error ***WARNING: SOLVER PROBLEM. NUMERICAL SINGULARITY WHEN PROCESSING NODE CEBAF_ASM-3-1.166 D.O.F. 1 RATIO = 2.71455E+13. I have tried a few options in the interactions...
  6. ysg519

    numerical singularity problem

    brendanpeach, Please let me know how you resolved this problem. Did xerf's advice on changing time to 1.e-9 help? My error is shown below. Thanks ***NOTE: SEVERE CONTACT OVERCLOSURES EXIST. CONVERGENCE IS JUDGED UNLIKELY. INCREMENT 1 STARTS. ATTEMPT NUMBER 5, TIME INCREMENT 3.906E-03...
  7. ysg519

    Sequentially Coupled Analysis

    Initially the model would not give me any details of error except "Abaqus exited with error". But when I deleted the boundary conditions I get this error. ***NOTE: SEVERE CONTACT OVERCLOSURES EXIST. CONVERGENCE IS JUDGED UNLIKELY. I think the model which is an assembly of 4 parts has issues...
  8. ysg519

    Sequentially Coupled Analysis

    I am simulating a sequentially coupled thermal analysis. I am working with an assembly. I have completed a thermal analysis and then modified the input file for element type, predefined field, boundary conditions(after saving under a different name). I keep getting an error that "abaqus exited...
  9. ysg519

    Convective Heat Transfer

    I have come across the convective heat transfer coeff value for air as between 10 - 100 (W/m2K) . That range seems like a big range any ideas as to how to narrow down that range?
  10. ysg519

    Convective Heat Transfer

    I am setting up a convective heat transfer interaction in abaqus. My model has a flat Alumina surface at a certain temperature (greater than ambient temp) exposed to atmosphere. I am not sure as to 1. what value to input for the Film Coeffecient (Flat Alumina surface) 2. What expression should...
  11. ysg519

    Partitioning

    I have posted this question as a separate thread but didnt get any response. I was wondering if you could take a look and please give me some input. I am repeating it here for convenience. THERMAL CONTACT PROPERTIES I am defining contact properties for conducting surfaces. In the boxes where I...
  12. ysg519

    Partitioning

    Thanks rstupplebeen and brep. And Mr.Stupplebeen will forgive brep for the "Mt" I think he meant "Mr" :)
  13. ysg519

    Thermal Conductance Properties

    I am defining contact properties for conducting surfaces. In the boxes where I am required to mention the conductance at zero clearance, what goes in there is it the thermal conductivity of the slave or the master surface. Also what goes in the clearance box for zero conductivity? In my case the...
  14. ysg519

    Partitioning

    Thanks corus the tet elements worked! Thanks brep.
  15. ysg519

    Partitioning

    I am analyzing a part after importing it as a .stp file. I have created seed points along edges successfully.When I try to mesh I get a message saying that areas in magenta cannot be meshed and should be partitioned. I have tried to partition it using options such as 3 point plane and normal to...
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