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Recent content by rm447

  1. rm447

    Extremely large viscous dissipation in Abaqus/Explicit

    Here is a figure of the strange viscous dissipation values: http://files.engineering.com/getfile.aspx?folder=4daa0ba3-933a-4539-8219-d6ed31116450&file=Energy_Output-RUN-1_PNL_CONTACTDAMP.png Thanks...
  2. rm447

    Extremely large viscous dissipation in Abaqus/Explicit

    Hello, I am interested in studying energy dissipation under impact loading. To start, I created an axisymmetric model similar to the example problem pl3d_erode_ale (where a rigid projectile impacts a plate, deforms it, and then bounces back) and gave the plate LINEAR ELASTIC properties. When I...
  3. rm447

    Initiating contact by applying force to rigid body

    Hi, I am modeling creep indentation of a material with a rigid flat punch modeled as a rigid analytical surface, and the analysis doesn't converge if I apply the load right away (as also discussed in thread799-293302). Instead I tried displacing the indenter by a small amount (step 1) to bring...
  4. rm447

    Impact analysis of a fluid-filled porous structure in Abaqus EXPLICIT

    Hello all, I am interested in modeling high strain rate impact of a fluid filled porous structure. Previously I always used Abaqus Standard since I wasn't studying "impact". For this analysis Abaqus standard has the *soils card with which the coupled displacement-pore pressure analysis of a...
  5. rm447

    Zero state variables passed by USDFLD

    An additional note: All the ARRAYS in general are zero-valued in USDFLD when I write them to .dat file: CALL GETVRM('SINV',ARRAY,JARRAY,FLGRAY,JRCD, $ JMAC,JMATYP,MATLAYO, LACCFLG) C stress invariants (MISES, TRESC, PRESS, INV3) JERROR = JERROR + JRCD...
  6. rm447

    Zero state variables passed by USDFLD

    Hi, I am trying to use some quantities in my UMAT such as pore pressure, strain energy, coordinates, etc., so in order to get access to them I am using USDFLD which calls GETVRM to get those values at the integration points, and assign them to solution dependent state variables STATEV. But these...
  7. rm447

    zero deformation passed into UMAT :( no updates.

    Hi there, I had posted a similar question before but I stoped working on this problem and now I'm back to it and stuck with the same issue!! I hope some one can help with this. I have written a UMAT for a time/stress adaptive material. In my UMAT I derive the elasticity tensor, stress, etc...
  8. rm447

    Problem with redefining BC's in variuos steps

    Hi there! I have a strange problem with switching boundary conditions between step 1 and 2 in ABAQUS/standard. Here is a quick description of what I'm trying to do: Imagine two objects with one being made of a soft material enclosing the other which is made of a different material (like a fruit...
  9. rm447

    Extract nodal displacements from initial and final shapes

    Hi! Has any body ever had to deal with a similar problem as follows? I have two stl files, one is of an object in an unstressed state, and one is of the same object after some deformations were applied to it through manipulation by some unknown forces. I need to find the resulting stress field...
  10. rm447

    Pick elements on the inside of a hollow object

    Hi everyone, I have a hollow object which is filled with another material in its cavity. I would like to model contact between the outer surface of the cavity and the inside of the outer object (TIED contact in ABAQUS). I am using Patran for pre-processing but I can't figure out how to pick the...
  11. rm447

    Constrain a surface in the direction of its normals at each node

    Hello, I wish to apply BCs to a surface that I have defined in ABAQUS. I would like to constrain each node in this node set in the direction of the normal to the surface at that point. Does any one know if there is a way to do this? Obviously it wouldn't make sense to define a new local...
  12. rm447

    Patran solid mesh :(

    Hi Onda, thanks for your response :)
  13. rm447

    Imoprting an assembly and defining contact

    Hi francoislambert11, thanks for your response :)
  14. rm447

    Imoprting an assembly and defining contact

    Hello! I have several parts in stl format which I can assemble together using either Geomagic or Pro/E. I wish to import these geometries into Patran and define the contact between each of the two parts. The ultimate goal is to run the model in ABAQUS. I don’t have the license for the Pro/E –...
  15. rm447

    Patran solid mesh :(

    Hello, I have some geometries in STL and IGES format that were created using a medical image procesing program from MRI scans. Patran does not recognize them as solids so I can not do a solid mesh. How do you get around this problem? Thanks!
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