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  • Users: RGX124
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  1. RGX124

    E33 in plane stress problem with CPS4 elements

    Hello, Could you confirm that the plane stress formulation of Abaqus does not allow to obtain the out of plane strain E33? Is the plane stress problem well implemented in Abaqus, because I get always E33=0? This is opposite to the theory especially if Trace(Stress) differs from 0. Thanks in...
  2. RGX124

    what is the best way to apply a force (in Newtons) on a surface?

    Hi, I know that it is possible to apply a concentrated force on a point but how is it possible to apply a force on a surface (line in 2D, or surface in 3D)? I would like to give it in Newtons and not a distributed load or a pressure in N/mm^2. Is it possible with some constraints (tie...
  3. RGX124

    Non exactly zero stress at unload (elastic model)?

    Hello, For a linear isotropic elastic material, I applied a load defined by an amplitude (0,0;0.25,1;0.5,0;0.75,-1;1,0) to obtain uniaxial tension on a block. At steptime 0.25 and 0.75, the stress is OK (constant=to the applied load); at time 0.5 and 1, there is a very small negligible stress...
  4. RGX124

    RADIOSS or LS-Dyna?

    Hi, I am a new comer in Dynamics. In my lab, we are using mainly Abaqus Standard and Explicit and sometimes ANSYS. We are advanced users of ABAQUS (UMAT,VUMAT, Python scripts). For dynamical problems where fluid/structure interaction are needed, I'd like to have your opinions about RADIOSS...
  5. RGX124

    RADIOSS or LS-Dyna?

    Hi, I am a new comer in Dynamics. In my lab, we are using mainly Abaqus Standard and Explicit and sometimes ANSYS. We are advanced users of ABAQUS (UMAT,VUMAT, Python scripts). For dynamical problems where fluid/structure interaction are needed, I'd like to have your opinions about RADIOSS...
  6. RGX124

    Ouput Stress components in the GLOBAL coordinate system

    Hello, I am facing the problem where I model the behaviour of an agregate defined by different crystals. Each crystal has an elastic anisotropic behaviour defined with respect to its orientation (*Solid section, orientation=.., material=.. ). In Abaqus, the default outputs of tensors and their...
  7. RGX124

    Restart an Explicit simulation?

    Hello, An explicit simulation crashed after an electricity shutdown. I did a restart for explicit with the following command: abaqus job=toto recover toto being the same input file. Unfortunately, the simulation stops after 2 hours with the following error message: Abaqus JOB...
  8. RGX124

    Best Dell Server and configuration for Abaqus simulations

    Hi, We are about 5 to 8 people using Abaqus in our lab on an already installed PE1950. We would like to install another server only dedicated to FE simulation. I had a look at Dell computing servers. I d like to know if you have an idea of what is the best server and configuration to run...
  9. RGX124

    MATERIAL ORIENTATION KEYWORD

    Hi, When running a simulation with different material orientations in different sections (partitions) of a plate, I get this error message in the .dat file. elements have incorrect orientation. The third axis should be in the hoop direction. The elements have been identified in...
  10. RGX124

    How to avoid INTERNAL option in the input file?

    Hi, I d like to know how to avoid the internal option when the input file is obtained in CAE. Is there a way (Python script or command) for CAE not to use that option? *SURFACE, Name=surfacename, internal Thanks for your help Rgx
  11. RGX124

    PYTHON: Get the name of the odb file

    Hi, I would like to get the name of the odb file in a python script. What is the Python command to get it? The odb is already open, and the name as to be read. Thanks Rgx
  12. RGX124

    Mass proportional damping: which value shall I enter?

    Hi, In an Explicit model I d like to enter a mass proportional damping with parameter alpha R. The default value is 0. The units are 1/time What is the range of alpha R? 1e-5, 1, 10, 10000000? What is the effect on the CPU time of the simulation. Thanks for your help R
  13. RGX124

    Initial velocity not in the initial step?

    Hi, I would like to model the impact of a sphere on a plane, consequently to another loading. Is there a way to prescribe an initial velocity condition not in the initial step? without the restart procedure? Thanks for the advice. R
  14. RGX124

    Programming Initial Conditions (stress) with Python

    Hi, I would like to integrate an initial stress state in an Abaqus model via the Python subroutine. I know that Initial stress is not supported in Abaqus/CAE. (see below). However the input file supports it. Is it possible to find a way to program it via the Python interpreter? Thanks for your...
  15. RGX124

    Contact between a sphere (TET) and a plate (WEDGE)

    Hi, I am trying to simulate a sphere that is shot on a plate. The sphere is meshed with TET elements and the plate with WEDGES due to symetry BC. The contact between the sphere and the plate is a normal hard contact with Default constraint enforcement method and a tangential friction...
  16. RGX124

    Boundary conditions in two different coordinate systems

    Hi, I have a problem applying displacement boundary conditions in two differents planes with a common edge. The displacement normal to the planes have to be set two zero. I have created a local coordinate system. However, this causes a problem. When I create the input file, I obtain the...
  17. RGX124

    How to create a 3D polyhedron knowing the vertices?

    Hi, I would like to create a 3D Polyhedron in CAE or with a Python script. I know all the coordinates of the vertices. Extrusion is not possible. Is there a way to create the edges, then to add faces and finally create a cell? If possible please let me know. Thanks Rgx
  18. RGX124

    Meshing a Triangle with Tri elements

    Hello, I am trying to mesh a triangular shell (100x100x100) with tri elements. (see the images in the Zip file) 1. When I specify a size of 3.125 per edge (Free mesh control), the resulting mesh is uniform and structured. See image free-size3125.jpg 2. When I specify a size of 2.0 per edge...
  19. RGX124

    Label on line contour type

    Hi, I would like to know if it is possible to show by a label the value of each lines on a line contour type as proposed in Abaqus viewer. Contour Plot Options -> Contour type = line I have not found this option yet. Thank you for letting me know. Regis
  20. RGX124

    Plotting Stress along a path with discontinuities

    Hi, I have a model with different material layers. I have created a path that is crossing through the different layers. Due to the different behaviour of materials, the stress is discontinuous. At the discontinuity, the node output gives two different values. Do you have any idea how those...

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