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  • Users: kumara123
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  1. kumara123

    Pile is moving upwards after the downward loading ends

    Hello, I am trying to model a pile penetrate into soil media. I modeled the problem with Abaqus and ran with no errors. I used Axisymmetric elements (CAX4R) to model both pile and soil also introduced the contract between soil and pile. An impact load was applied on top of the pile which lasts...
  2. kumara123

    Why the pile moving upward after the loading ends?

    Hello, I am trying to model a pile penetrate into soil media. I modeled the problem with Abaqus and ran with no errors. I used Axisymmetric elements (CAX4R) to model both pile and soil also introduced the contract between soil and pile. An impact load was applied on top of the pile which lasts...
  3. kumara123

    Applying gravity as "body force" in Explicit step in Abaqus

    Hello, I am working with Abaqus Explicit to simulate ground wave propagation. Before applying dynamic step I want to establish initial in-situ stress of the soil. Can I use the explicit step to input gravity as a body force to the model? If I use a geostatic step, I can not use the explicit step...
  4. kumara123

    the effective mass of the frequency analysis is more than the total mass of the model for some cases

    Hi, I ran a frequency analysis in Abaqus to find the first natural frequency and frequency related 95% model mass. The obtained participation factors are very much low and also effective mass (e.g - 6.74E9) for the rotation components are larger than the total mass of the model (4.27E7). Can...
  5. kumara123

    Effective mass of the frequency analysis shows more than the model mass

    Hi, I ran a frequency analysis in Abaqus to find the first natural frequency and frequency related 95% model mass. The obtained participation factors are very much low and also effective mass (e.g - 6.74E9) for the rotation components are larger than the total mass of the model (4.27E7). Can...
  6. kumara123

    How to find frequency related to 95% model mass?

    Hi, I am conducting a frequency analysis in abaqus to find the 1st frequency and frequency related to 95% model mass of model. I need these values to calculate the Rayleigh damping parameters. Can you tell me how to find this model mass participation factor in Abaqus? Thanks...
  7. kumara123

    How to find frequency related 95% model mass?

    Hi, I am conducting a frequency analysis in abaqus to find the 1st frequency and frequency related to 95% model mass of model. I need these values to calculate the Rayleigh damping parameters. Can you tell me how to find this model mass participation factor in Abaqus? Thanks...
  8. kumara123

    Meshing an irregular part in Abaqus

    Hi, I want to model a pile penetrate into soil media and have a problem with meshing the model. I always get an error saying the elements contained in element set ErrElemExcessDistortion-Step1 have distorted excessively. Previous researchers used a special method by using special shape as shown...
  9. kumara123

    Meshing an irregular part in Abaqus

    Hi, I want to model a pile penetrate into soil media and have a problem with meshing the model. I always get an error saying the elements contained in element set ErrElemExcessDistortion-Step1 have distorted excessively. Previous researchers used a special method by using special shape as shown...
  10. kumara123

    What is VUMAT?

    Hi, I want to model geofoam as infilled material in a ground barrier. I came to know that I have to use VUMAT for that purpose but I don't have an idea how to use it. Can anyone recommend me a reference material to learn about VUMAT? Thanks
  11. kumara123

    How t use VUMAT in abaqus?

    Hi, I want to model geofoam as infilled material in a ground barrier. I came to know that I have to use VUMAT for that purpose but I don't have an idea how to use it. Can anyone recommend me a reference material to learn about VUMAT? Thanks.
  12. kumara123

    Are the Newmark-beta parameters and mass and stiffness parameters of Rayleigh damping same?

    Hi, I have a confusion Newmark-beta parameters and mass and stiffness parameters. The literature says that Newmark-beta parameters used for the numerical attenuation while Rayleigh damping (stiffness and mass damping parameters) used for material damping in Numerical simulations. I'm not sure...
  13. kumara123

    How to include shear wave velocity in abaqus?

    Hi, I want to take into account the change of impedance and shear wave velocity with different layers of soil. Can anyone explain to me how to incorporate shear wave velocity and impedance into different materials in abaqus? Thanks
  14. kumara123

    How to model infinite part for axisymmetric elements in Abaqus?

    Hi, I am trying to model an infinite boundary for 2D soil media with different layers in Abaqus. I want to add an infinite part to the axisymmetric elements. I tried that with defining acoustic elements (ACAX4) and then convert into infinite elements (CINPE4) in .inp file. But it was done by...
  15. kumara123

    Element Type CIN2D4 in Abaqus

    Hi, I am trying to model an infinite boundary for 2D soil media in Abaqus. First, I create the infinite part with Acoustic elements (AC2D4) then try to replace with CIN2D4 in .inp file. But it says that "Element type "CIN2D4" is not supported" It normally works with ACAX4 to CINAX4 and AC3D8 to...
  16. kumara123

    What does mean by "half-space of soil"?

    can anyone explain what does mean by "half-space" of soil... Thanks...

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