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  1. ebdoep22

    How to model a tendon contracting

    Currently I am working with a unique actuator which under the simplest explanation is like a small rope which we can control the contraction of. This actuator can easily be cast in flexible polymers and then used to control the shape/motion of the cast structure. In the past the FE models have...
  2. ebdoep22

    tie-Contact problems with Abaqus

    Those material properties seem fine, but the material needs to have an orientation defined everywhere it is used. When you do your section assignments for each part or each partitioned region you will be in the "Property Module". This is where you need to assign the orientation of the material...
  3. ebdoep22

    Update surface pressure based in next step

    I currently have a model which applies a varying surface pressure based on a analytic field which varies in all three directions. I would like to apply a load in Step-1 then in Step-2 have the model update the surface pressures based on the new deflected coordinates. Currently I have the...
  4. ebdoep22

    Displacement dependent surface pressure/traction

    Are there any free compilers that work with Abaqus? Any help is appreciated.
  5. ebdoep22

    Displacement dependent surface pressure/traction

    So after doing some more research is does look like DLOAD or DSLOAD is my best option. But what I can't figure out is where do I find the correct FORTRAN compiler, apparently everyone is saying Abaqus is really picky about it, I am using 6.12.
  6. ebdoep22

    Displacement dependent surface pressure/traction

    Is there an example of this somewhere? I know some about CAE and the Abaqus Python script but nothing about Fortran. I find it a little hard to believe with all that CAE can do, you can't setup a simple displacement dependent pressure force. This is kind of a first order effort at a fluid...
  7. ebdoep22

    Displacement dependent surface pressure/traction

    So I see that DLOAD does contain COORDS which seem to update to the current position in a nonlinear analysis, this is what I need. However is there a way to do this in CAE? I know I can apply a pressure load and specify User-Defined in CAE, which it then says that a DLOAD routine must be...
  8. ebdoep22

    Displacement dependent surface pressure/traction

    I need to be able to model pressure loads on a surface which change with displacement. As a simple example imagine a cantilever beam with tip load which does not change pushing down. This motion is resisted by a pressure load on the bottom surface which is a function of displacement in the...
  9. ebdoep22

    Find model weight

    Worked, got it. Thanks
  10. ebdoep22

    Find model weight

    Been having an issue solving this for a while. I need to find the weight of my structure. I have included the density of all materials. The model is a 2D plane strain model. When I used .inp files for my studies I would load the nodes and element connectivity matrix in Matlab, find the area of...
  11. ebdoep22

    Mesh Convergence Issue

    Anyone have any ideas?
  12. ebdoep22

    Mesh Convergence Issue

    Using several orthotropic materials (CFRP and honeycomb) and have large deflections. Also the materials have extremely different modulus. The honeycomb has a 0.0 Poisson's in two directions. The model is of a morphing trailing edge for an aircraft. Looking at the cross section, the flexiable...
  13. ebdoep22

    Mesh Convergence Issue

    I have a 2D model made using CPE8 and CPE6 elements in a non-linear analysis. The model was running fine, but before I moved any further I wanted to do a mesh conv study. What I found I can't explain. Attached is a plot with the X axis being mesh seed size (finer mesh to the left courser to the...
  14. ebdoep22

    Finding mass using .inp

    I have everything setup through input files and have assigned a density to each material. Any idea on how to find the mass of the model? Preferably printed to a .dat file.
  15. ebdoep22

    Finding mass using .inp

    Everything I find about finding mass just says "use the query tool", but I am trying to do this with .inp files and read the mass from the .dat file in a completely automated system. Any thoughts?
  16. ebdoep22

    Abaqus/Matlab Parameterized Design

    After working some with the Delaunay Triangulation in Matlab I have discovered that it can cause all sorts of problems with poorly formed elements; meaning triangles with high aspect ratios. I guess with more work I can sort some of this out in Matlab, but I have Abaqus which has been designed...
  17. ebdoep22

    Abaqus/Matlab Parameterized Design

    Thanks, the leading me towards delaunayTriangles was the key. It took a while but I got it. The way I did it was in Matlab layout all my nodes, making sure to place them along the borders of the materials. Run the Matlab delaunayTriangulation routine making sure to specify borders so that it...
  18. ebdoep22

    Abaqus/Matlab Parameterized Design

    I will describe this problem using some simple geometry though the actual model is more complicated. The problem is limited to 2D planar. Ultimately this will be a shape optimization problem, but right now I just want to do a parameter study. --Setup I have a square plate with a circular region...
  19. ebdoep22

    New to Abaqus - What is the different between scripting (.py) and input files (.inp)

    Thanks that helps. It was just confusing because it seemed like there were two different systems being discussed. It also helped to know to look for a keyword glossary and not a command glossary. I am sure I will be back with questions, but off to a better start now.
  20. ebdoep22

    New to Abaqus - What is the different between scripting (.py) and input files (.inp)

    I have found examples. But most seem to be on python scripting for .py files. The person on the project before me (who is no longer here) wrote .inp files. It seem that the two are not the same or compatible. I can't type the .inp commands into the python script box at the bottom of the CAE...

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