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  • Users: rmettier
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  1. rmettier

    How can I avoid intersecting parts?

    Here's some background into the model I'm trying to run: This is a fairly large scale geological setting, done in 2D using Abaqus Explicit (6.8-3)and CAE. See attached file for a zoomed out view of the relevant bits. At this step, the parts are just settling under their own weight, and jostling...
  2. rmettier

    Random variations of material properties in CAE?

    Hi I'm using Explicit to model some geodynamic stuff, and I've reached the point where perfectly homogeneous materials are becoming a problem. What I'd like to do is have an elastic definition for, say, granite with (E=53GPa, v=0.28) and then add a small random deviation to Youngs modulus...
  3. rmettier

    ODB Postprocessing - Coordinates relative to a node?

    I have a model step over which i need to plot the motion of a part of my model. The step has 100 timesteps, and I have COORD set as a field output. So I'm using the 'create field data' tool, and creating a new field from existing fields as "s3f100_COORD-s3f0_COORD". So far, it's working, but...
  4. rmettier

    Changes in friction having no effect?

    I'm experiencing some very weird behaviour in ABAQUS Explicit 6.7 (+CAE) I'm running a 2D model with quite complex geometry; 19 parts moving slightly against each other. Basically, push on one part and see how that moves the others. You'd expect the friction between the parts to have some...
  5. rmettier

    Use deformed shape as new part sketch?

    I'm running a series of models, where it's necessary to first gradually 'unload' gravity from a shape obtained from field measurements, then to reload it with slightly different material. So I'm running a first model that applies 'negative gravity' upwards, while holding the bottom of the shape...
  6. rmettier

    From ODB, show difference in deformation?

    Hi all, I'm back with a new problem. I have the odb of a successfully completed restart run. I'd like to visualize the deformation in the final step, relative to the deformation at the start of the restarted model run, instead of relative to the initial step of the full (non-restart) model...
  7. rmettier

    Rebuilding an odb for restart? - ABQ Explicit

    I've been playing around with reading odb files through the python interface recently, as well as with restarted analyses in Explicit (CAE). I'm wondering if it would be possible to do the following: run a first simple analysis step extract the results from the odb analyze and modify them in...
  8. rmettier

    Some scripting help? re: reading coords form odb

    I'm trying to extract some deformed coordinates form an odb file, using 'abaqus python extract.py' The odb is call 'unload.odb' the relevant step is called 'Settle' I want the data from the last frame. Here's my code so far: ------------------------------------------ from odbAccess import *...
  9. rmettier

    Isotropic strain failure?

    I'm trying to define strain based failure criteria for an isotropic elastic material, using CAE. The suboption 'Fail Strain' gives me a table with five values: Tensile and Compressional failure strain for directions parallel and transverse to fibres, plus shear strain failure. But as my material...
  10. rmettier

    Remove distorted Elements? Using CAE, maybe?

    Is there a way (preferably in CAE) to let ABAQUS remove an element once it becomes distorted past a certain limit, based on the elements geometry? I have a nice little model going, that abort due to excessive distortion in a certain region. However, the distorted elements have already passed...
  11. rmettier

    Viscoelastic material, prony series?

    I'm studying a model that I got as an example from a former co-worker. She used a viscoelastic material, defined through a time-domain prony series. The three parameters are: g_i= 0.99 k_i= 0 tau_i= 1000 I'm trying to understand what that series does. I've fiddled with the three parameters and...
  12. rmettier

    Writing older .inp versions from CAE?

    Hi I have a fairly simple question this time :) When I tell CAE to write the .inp file for a certain job, is there a way to have it write an .inp file that is compatible with an older ABAQUS solver version? I'm using 6.7 CAE on a local machine, but would like to run the more extensive models...
  13. rmettier

    gravity load, vector components. A bug maybe?

    I'm trying to model some viscoelastic deformation under gravity load. I'm using an explicit dynamic timestep. The units I'm using are kilometers and years, so 1 standard gravity comes to 9.75e12 km/a^2. If I used SI units and provide the vecotr components of the define gravity load a (0 /...
  14. rmettier

    Damping, parameters

    I'm modelling some effects of changing acceleration on sandstone, and I'd like to add the damping effect listed in the mechanical properties of the CAE material dialogue. The parameters are alpha, beta, structural and composite. I've done some web research and can't seem to find a formulation...
  15. rmettier

    name 'side1Edges1side1Edges1' is not defined

    Some wierd behaviour in CAE (or maybe I'm just to dumb to understand what it's on about). I have a 2D polygonal part, and I'm trying to define a surface, conisting of all the lines making up the polygon. Because this part is in contact with others, I need to deactivate the 'Select entity closest...
  16. rmettier

    Reading unknown data from odb?

    I'm currently using a script derived from the one in "8.5.10 An example of reading field data from an output database" to extract the nodal coordinates for the deformed parts in an odb, in order to process them further in Matlab. It's working fairly well, but it's annoying that you can only...
  17. rmettier

    Simplest possible breaking model?

    Hi I'm still very much of a newbie to ABAQUS, and am currently getting to know my way around ABAQUS CAE. I've done some simple little elastic deformation models so far, but nothing very complex. What I'm trying to do now, is set up a very simple 2D concept model of a piece of material (think...
  18. rmettier

    Do you have any nice output you'll like to share?

    I've been asked to give a short presentation about Abaqus at our weekly geology/tectonics seminar next week. I'll mainly be focussing on flexibility, especially scripting and interaction between i.e. Matlab and Abaqus. Of course, some nice spectacular examples of models would be great to pique...
  19. rmettier

    Writing the inp file?

    Hi A seemingly simple question this time, but the manual isn't being helful today: I have a script that imports some geometry into Abaqus CAE, generates the necessary meshes, materials, interactions, etc. Generally right down to the point where I only have to submit the job. Now I'd like the...
  20. rmettier

    findAt could not find a geometric entity

    Hi, I've run into another scripting problem. Maybe someone can give me a hint. I'm using the following formulation to select all edges of a part instance as a surface for an interface: --------------------------------------------------------...

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