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Marie

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  1. Hi, What part of the model will be deleted when nodal time step becomes smaller than ΔTsca,del*ΔTmin,del if I use se /DT/NODA/DEL?
  2. Hi, thanks for the reply. I did not use the kinematic relaxation together with mass scaling. But using /KEREL or applying a higher density to the elements leads to similar results. Could this mean that because I impose a much higher imposed displacement velocity, it would be better to use one of these two options instead of just using the correct density? In other words, are the results shown in the above green and red force displacement curves probably more correct than the ones in the blue curve?
  3. Hi again, I also noted that if I use the correct density but in addition I add the kinetic energy relaxation card (/KEREL), the FORCE-DISPLACEMENT curve becomes similar to the one obtained with the wrong density.
  4. Hi, Thanks a lot for the fast replies. I did not apply mass scaling so far, thus the time step was set by the solver. The only difference between the models is the density of the material, but this difference was very large. It should be a quasi-static model.
  5. Hello, I am simulating a pull out test of a screw from an elastoplastic material ( MAT_LAW2, PLAS_JOHNS). The imposed displacement velocity that I apply on the screw is a lot higher than in reality. Before I used an elastoplastic material with a much higher density (probably like an excessive mass scaling) than the real one because it speeded up the simulation and the results did not change a lot. When I now perform the simulation with the correct density, I obtain curves which have sudden drops after the maximum force (see figure attached) is reached and from the .h3d file it seems that this is caused by a simultaneous deletion of many elements on one side of the screw. I do not think that this latter behavior is correct and I wanted to know if someone has a suggestion on why this is happening. Can it be due to dynamic effects? What is the role of the density in the computations?
  6. Hi, is it correct that the values in the compression and tension yield stress curves of MAT LAW 66 are true stress and true strain?
  7. Hi Prakash,  I will check it, thanks
  8. Hi Prakash, my material behaves differently in compression and tension, so how can I model this?
  9. Hi Prakash, thanks, but I was looking for a specific example using the pressure dependent function fct_IDp. I only have the stress-strain functions of the material for compression and tension and I do not know how to calculate the pressure function based on them
  10. Hi, I'd like to model an elasto-plastic material with a softening and stiffening region. This material behaves differently in compression and tension, thus I would like to input a fct_IDp for Mat LAW 36. Is there an example on how to define this pressure dependent function? Thanks for the help
  11. Hi, I defined the material in the following way:
  12. Has somebody an idea about why the material behaves like this?
  13. Marie

    Material law

    Thanks for the help!
  14. Marie

    Material law

    Thanks for the fast reply. I wasn't really able to implement my material behavior (see image) with the suggested law 36. The elements are solids. Do you have an idea of what I could do?
  15. Hello, I would like to define a material which behaves as follows: there is an initial linear elastic behavior (with a defined E-modulus). Then there is a perfectly plastic region at a maximal stress until the plastic strain reaches a determined value. Next, there is a strain softening phase with a plastic modulus and ultimately an indefinite perfectly plastic phase begins when a stress(min) is reached. How can I implement such a material behavior? Thanks in advance for the help
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