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  1. danieljgalles

    Drucker-Prager Cap UMAT

    Hi, I was wondering if someone has a Drucker-Prager Cap UMAT subroutine for ABAQUS. I know this routine is already available in the ABAQUS library, but I'd like to make some slight modifications to the subroutine. Thanks, Daniel
  2. danieljgalles

    How to measure volume change on old triaxial setup

    Ron, I considered that, but I question the accuracy of a sight glass for small volume changes. Also, a sight glass would be considerably more difficult to install (in my setup) than something inline.
  3. danieljgalles

    How to measure volume change on old triaxial setup

    Hi, I'm about to start running some drained triaxial tests on dense sand. For my research, it's very important that I measure the dilation in the sand specimen. However, the triaxial test machine I'll be using cannot measure volume change. Instead of a pressure/volume controller, my setup only...
  4. danieljgalles

    error after multiple restarts in ABAQUS

    I'm running a standard/explicit co-simulation in ABAQUS. I've been having problems with excessive distortion at the co-simulation interface, so I'm trying to reduce my step size. Unfortunately, the co-simulation technique can only be used in one step for each analysis. So what I'm doing is...
  5. danieljgalles

    Mechanical properties for dense sand

    I am running FEA simulations in Abaqus - I want to model dense, dry silica sand with grain diameters of approximately 0.3 mm. I'm using the Drucker Prager Cap model to simulate deformation. Does anyone know where I can find some triaxial test data to determine the parameters? I've been looking...
  6. danieljgalles

    Passing a node set into VUFIELD subroutine in Abaqus

    I'm trying to write a VUFIELD user subroutine in Abaqus. From what I've read in the documentation, blocking is set to "NO" by default. When this is the case, you simply pass a node set into the user subroutine to be assigned values. This is the syntax I'm using: *FIELD, USER allNodes, where...
  7. danieljgalles

    Import .odb results using *Amplitude

    I would like to use the temperature results from a .odb file as input into a new simulation. I can do this by specifying *Temperature, file=<path for .odb>, bstep=<step in the .odb to read the temperatures> Then, I just create a step at each time I want to import another temperature field...
  8. danieljgalles

    Signal 11 error when attempting multiple restarts of a co-simulation

    That could be my problem - I'm importing temperatures from another software package. I could try to import the temperatures from a previous ABAQUS simulation. Thanks!
  9. danieljgalles

    Signal 11 error when attempting multiple restarts of a co-simulation

    I need to use co-simulation in ABAQUS to solve my problem. Additionally, my simulation contains many (approximately 200) steps. Since co-simulation can only be used in a single step, I'm using the restart option to restart the simulation at the beginning of each step. When I began my third...
  10. danieljgalles

    Load-controlled triaxial test simulation in ABAQUS using clay plasticity material model

    I am attempting to simulate a triaxial test in ABAQUS/Standard using the clay plasticity model in the ABAQUS material database. I am using a 3-D cylindrical specimen which contains a single element (3D stress - C3D10) . For my initial BCs, I applied a zero-displacement BC in the vertical...

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