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  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

    ...to go back to its original shape (after the projectile has already bounced off) it gets larger and almost reaches ETOTAL. This was without using *Bulk Viscosity, so then I entered zero for both linear and quadratic parameters under *Bulk Viscosity thinking that it would decrease viscous...
  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

    ...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 porous medium is possible and very straight forward. The problem is...
  5. rm447

    Zero state variables passed by USDFLD

    ...$ JMAC,JMATYP,MATLAYO, LACCFLG) C stress invariants (MISES, TRESC, PRESS, INV3) JERROR = JERROR + JRCD FIELD(1)=ARRAY(1) FIELD(2)=ARRAY(3) WRITE(6,*),"MISES - ARRAY(1)",ARRAY(1) WRITE(6,*),"PRESS - ARRAY(3)",ARRAY(3)
  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.

    ...a CPE4 with its two lower nodes pinned, and the upper two constrained in x direction. I then tried to compress the square once using a moving BC: *NODE,NSET=NALL 1,0.,0.,0. 2,2.,0.,0. 3,2.,4.,0. 4,0.,4.,0. *ELEMENT,TYPE=CPE4,ELSET=umat 1,1,2,3,4 *SOLID SECTION,ELSET=umat,MATERIAL=umat...
  8. rm447

    Problem with redefining BC's in variuos steps

    ...start from the final locations at the end of step 1? I will greatly appreciate your response!! Thanks! PS: I have found out that I can use either *Restart, READ, or the *Import card and break down the analysis into two separate steps. But I still have the same problem of everything starting...
  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!
  16. rm447

    How do you choose the X axis in ABAQUS CAE?

    Hi, I am trying to plot stress vs. strain values in ABAQUS CAE but ABAQUS keeps plotting them versus "time". How can I choose my own X axis? I don't seem to be able to figure this out even though it must be very trivial!! I will appreciate your help!! Thanks :)
  17. rm447

    Read an txt.file from ABAQUS

    Hi Paulis, Can you tell me how you extract a text file from ABAQUS? The need just came up and I was trying to use Fortran to read the results but if they can be written to a text file which can be read by Matlab then that will make life so much easier!! Please let me know! Thanks :)
  18. rm447

    Modeling stress relaxation in ABAQUS

    Hi, I am trying to model a stress relaxation experiment in ABAQUS. I am using cartilage material in the test and for modeling that I am using the soil analysis. The displacement of the indenter for each step is a ramp rising at constant velocity for t0 seconds and then constant over some...
  19. rm447

    Healing Surfaces

    Hey guys, thanks for your replies. Okay, so I have a very simple question so don't laugh at me because I am not too good with Pro/E. How do you cut one object into two parts using a surface, so that you can save the two resulting pieces separately? What I am trying to use is Sweep/Cut. But Pro/E...
  20. rm447

    Healing Surfaces

    Thanks for your reply, but that is not free anymore apparently. What I am trying to do is import my parts into Pro/E as a solid so that it is easy to manipulate. I have been working with STL's so far, but now I need to cut one object into two parts using a cutting surface and save them as two...

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