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  • Users: polak7
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  1. polak7

    ECAP - material flows between the punch and the die?

    Hello. I have a problem with modelling of ECAP (Equal Channel Angular Pressing) process. The problem is, that the mesh distorts heavily – it looks like the material (billet) flows between the punch and the die during the processing: The assembly is given below: The ECAP canal has 10 x 10...
  2. polak7

    Steel rolling process with large deformation - implementing ALE adaptive meshing

    I am simulating a rolling process of steel. The model is 3D with symmetry planes in Y and Z directions. I am using Abaqus Explicit for this. The height reduction of the material is high - around 80%. The simulation runs successfully, however mesh elements deform heavily, so I want to use...
  3. polak7

    Volumetric locking in CPE3T elements - possible?

    Is it possible, that volumetric locking will occur during compression of CPE3T elements, if the material is elastic (without plastic behaviour)? The Poisson ratio of the material is 0.3.
  4. polak7

    Time Increment in DFLUX subroutine

    How can I get the time increment in DFLUX subroutine? There is no variable DTIME there. I thought about using some kind of substraction equation where I substract a variable containing total time at the end of the previous increment from the actual total time TIME(2). Do you have any idea how...
  5. polak7

    Different mesh density on the individual part

    Hello, Look at the figure: Here are two parts TIE'ed together and the mesh densities on them are different. Is it possible to obtain the same results using one part with partitions? I tried to do that, but I can only change the number of elements on the thickness of partitions.
  6. polak7

    Separation of two bodies

    Hello Lets say, that I have the situation as in figure below: There are two elastic parts. They are subjected to compression and tension as the arrows indicate. There is some friction between the parts and the substrate. Now, normally parts will separate from each other at some point. I want...
  7. polak7

    Matching the meshes of two parts

    I do not know how to much two meshes of different parts together. I want to have nodes from surfaces of these parts in the same positions (at edge at which these surfaces are in contact). Below is the screenshot from Abaqus: I tried changing node global sizes and local seeds, using different...
  8. polak7

    Ball bounce from the material

    How can I model ball bounce of the rigid body from elastic-plastic material? I am using Abaqus/Explicit. There is a ball, which initial speed (predefined field) is 20 m/s. A ball is moving towards the fixed on the upper side steel plate as can be seen below: But after the contact was...
  9. polak7

    XY Data - Abaqus gives me many stress values for identical time step

    When I extract the stress values from the results by XY Data option, it gives me something like this: Step time Stress 0 0 0.01 0 0.02 0 0.035 0 0.057499997 0 0.091249995 0 0.141874999 0 0.200000003 0 0.200000107 0 0.200000212 0 0.200000197 0 0.210000202...
  10. polak7

    MPC - indestructible link - Video

    I have to create link between two bodies. When one of the bodies moves, then the link must pull the second body. I have created such model. It is presented on the video below: https://www.youtube.com/watch?v=Aasnl-tQuSA&feature=youtu.be Next, I fixed one body in all axis directions...
  11. polak7

    Friction at the beginning of the analysis

    Here is my assembly before the analysis: There is a friction coefficient defined between bodies A and bodies B. When the simulation starts, the assembly moves to the right, but the bodies A stay in the place, in which they were at the beginning: There is no deformation at the initial stages...
  12. polak7

    Symmetry on discontinuous surface

    Can I define in some way symmetry on discontinuous surface? Here is the figure: I want to define Y-symmetry, but it should reflect all assembly. So, can I define continuous symmetry on discontinuous surface? I want to have red color (symmetry) on the entire length.
  13. polak7

    My elements disappear?

    I am doing multilevel modeling (submodeling), which connect macro model with meso model (rolling process, the inner part of the material is analysed). The nodes are transferred from macro model to the meso model. I did macro-level simulation, and I have problem with the latter. At the beginning...
  14. polak7

    Rolling - no increase in strip's length

    I have developed the rolling process in 2D. The slab's geometry before the rolling was: -length: 120 milimeters -height: 2 milimeter After the rolling process: -length: 120 milimeters -height: 0.9 milimeter Relative displacement in 1 direction: 8.82149e-005 milimeters Why there is no...
  15. polak7

    Moving Heat Flux (laser) - From the simplest example - DFLUX subroutine

    Hello, I have to write the DFLUX subroutine for moving heat flux (laser, described by Gaussian equation). It should be "volumetric heat flux". I am novice in writing subroutines. It is first in my life. Here is the equation: And here is the figure of substrate, on which the heat flux is...
  16. polak7

    Problem with visualisation without background

    I have problem with a results visualisation: Here is a print screen from my results: The white line in the middle of the specimen is the problem. I do not want to have it there. Now, look at the same results but with background: There is also white line, but it is less visible. It means...
  17. polak7

    Element reactivation and heat exchange

    I have a problem to solve, but I do not know how to do it. I will describe it: This is the coupled temp-displacement analysis. The assembly contains two tied parts, part "A" and part "B": Next, I mesh them: I define the temperature values. Part "A" = 1500°C, part "B" = 20°C And then, after...
  18. polak7

    Variable in a subroutine - definition

    I have a question related to the UEXPAN subroutine. The example from Abaqus Verification Manual is given below: c c user subroutine uexpan subroutine uexpan(expan,dexpandt,temp,time,dtime,predef,dpred, $ statev,cmname,nstatv,noel) c include 'aba_param.inc' c...
  19. polak7

    Plane strain elements work incorrectly in rolling process

    When I use plane stress elements in simulation all works great. The picture below shows the results from my analysis with the use of that elements: But when I change the type of elements to plane strain, the results are terrible. Look: The only change I did is different element type. And...

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