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  1. UWOVenky

    Would the geostatic step be considered correct if it converges in more than 1 increment?

    Abaqus manual has stated that usually geostatic step must converge in 1 increment. But would it be considered correct if geostatic step converges in more than 1 increment like 0.25, 0.5, 0.75 and 1 s? The displacements are very low and stresses are also correct at the end of analysis.
  2. UWOVenky

    Geostatic step on a half 3-d model- Boundary conditions

    Taking advantages of symmetry of loading acting on a circular foundation and soil, I have reduced to my model to half cylindrical (semicylindrical) model. Thus foundation and soil are both semi cylindrical. However, I do not get a successful geostatic step which I was getting in my complete 3-d...
  3. UWOVenky

    Help with geostatic analysis

    I am glad to know that. all the best.
  4. UWOVenky

    Meshing a simple cuboid shape of soil

    ok alright, thanks for the support everybody. The reason why I have kept the seed size at the centre such small is I am trying to mobilize the full frictional resistance between soil and foundation. previously I was using a seed size of 0.95 but I could not get the favorable results. I checked...
  5. UWOVenky

    Meshing a simple cuboid shape of soil

    ok let me try that. But from my literature study, I understood that C3D8R would be better to use instead tetrahedral elements. And hence I have been using them.
  6. UWOVenky

    Meshing a simple cuboid shape of soil

    Please see the model FM not HalfModel for editing mesh. Also ignore the jobs.
  7. UWOVenky

    Meshing a simple cuboid shape of soil

    You are right, the file size is too large to upload. I am uploading another file. This time it is a circular foundation. It shows the way in which partitioning and seed sizes have been given. With this, I am getting 125300 elements. Can you have look at the file and edit it to reduce the no of...
  8. UWOVenky

    Meshing a simple cuboid shape of soil

    Quarter symmetry may give me doubtful results. I have a moment acting about Y axis besides a vertical displacement and horizontal displacement. Therefore I believe I should not use quarter symmetry. Is there a problem with uploading files? I have been trying to upload the .cae file from...
  9. UWOVenky

    Meshing a simple cuboid shape of soil

    By symmetry are you saying that I must reduce the size of model to half? I can reduce the model to half the present size but after applying the X-symm boundary conditions on the exposed side of foundation and soil, the model does not seem to give right results. The sides are roller (U1=U2=0) and...
  10. UWOVenky

    Meshing a simple cuboid shape of soil

    Remember that the mesh quality is also important. I do not want to have lot of elements with face angle less than 35 or greater than 135 or aspect ratio greater than 10.
  11. UWOVenky

    Meshing a simple cuboid shape of soil

    Attached is the figure of a simple cuboid of soil which I want to mesh. I have been able to mesh this part successfully but by putting a question here my main aim is to reduce the number of elements without affecting the seed size at the centre. At the centre there are 3 circles which have a...
  12. UWOVenky

    Help with geostatic analysis

    Sorry I do not have 6.13 and so I cannot see your file. However I am attaching a Sample geostatic file. This is 6.10 version file but you can convert it to 6.13. The reverse is not possible. Here is the brief description about the file Soil is saturated undrained overconsolidated clay. So note...
  13. UWOVenky

    Help with geostatic analysis

    For a 2d model, choose plane strain elements. Define only elastic properties i.e. E and v. For boundary conditions, use roller (U1=0) for the sides and fixed for the bottom. Apply a body force as told before. Also use *Initial Conditions, Type= Stress, Geostatic by editing keywords file. Once...
  14. UWOVenky

    Help with geostatic analysis

    body force is specified in force per unit volume. So I applied a body force equal to the value of density of the soil. For example, if density is 2556 Kg/m3, then convert this to N/m3 which comes 19000 N/m3. So just write 19000 in component 2 direction. I am assuming here that the vertical...
  15. UWOVenky

    Changing x,y,z axis

    In the assembly module, you can use the option of ROTATE or TRANSLATE. By doing this, you change the local coordinates direction. I used this option to make + Z axis to - Z axis. Important to remember here is in the PART module, these directions do not change and only in ASSEMBLY module, the...
  16. UWOVenky

    Help with geostatic analysis

    I consider that your model is 2d, that's why you are saying S22 otherwise for 3d model, it would have been S33. I see that you have so many parameters, so to troubleshoot just simplify the model by removing the groundwater table and initial void ratio and keep density, linear elastic and...
  17. UWOVenky

    No tension interface elements between soil and foundation

    I want to create no tension elements between soil and foundation. To do this, I have created a thin circular layer of 0.01 m and assigned it the linear elastic properties of soil (for no tension, plastic propertes like mohr-coulomb model cannot be used). I also toggled on "No Tension" option in...
  18. UWOVenky

    Vertical-Horizontal loading on a foundation-soil system-Abaqus

    In Abaqus, I have an octagonal foundation resting on soil. I am required to produce a Vertical-Horizontal (VH) loading failure envelope for this system. A VH failure envelope for a circular footing resting on soil has been attached. I am describing briefly how this is achieved by using finite...
  19. UWOVenky

    Meshing Octagonal Part- Face Angle less than 45 degrees

    I was successful in removing the wedges by taking the partition cells off the geometry without affecting the shape of the octagon. With a seed size of 0.35 and partitioning in the form of triangle, I got warning for only 0.96% of elements. This is pretty good compared to my previous attempts...
  20. UWOVenky

    Meshing Octagonal Part- Face Angle less than 45 degrees

    I removed partition cell 2,4,5,6,7,8,9,10 to get rid of wedges and the base square. Let me work from here and see what happens.

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