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  • Users: mel08
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  1. mel08

    contact -too much penetration

    I have an issue with contact. I have a screw thread surrounded by highly porous bone, and I am trying to model tightening of the screw. I have run my model with a fully bonded contact condition & the model solves without convergence issues. I now am trying to simulate friction with a friction...
  2. mel08

    Direct Mesh Generation Workbench

    Hi, I wondered if it is possible to perform direct mesh generation in workbench 12.0? I have some external software which creates meshes based on medical image data. It uses a standard solid45 brick element for each voxel in the image and writes an input file for Ansys classic. I can read it...
  3. mel08

    Resume Batch mode

    Hi all, I had been running ansys in batch mode on a parallel processing system. The license server for ansys died and the IT just killed all the licenses and restarted the server (without telling me!!) So my batch run has stopped. Is there anyway I can restart this run from where it was. It's...
  4. mel08

    solid 45 vs solid 185

    Thanks!! Yeah, i've been reading a bit and that's my understanding too. From my analysis the results seem better with solid185 so I guess I'll stick to using that one. Thanks again!
  5. mel08

    nodal reaction forces

    hi thanks, I'm running my analysis in batch mode and need to get the sum during the run between load steps, so I couldn't use prrsol. But I have worked out how to do this. Thank you for your help!!
  6. mel08

    solid 45 vs solid 185

    Hello, could anyone tell me the main difference between solid45 and solid185, and when you would choose one over the other. Would you get the same results no matter which element you used?? thanks!!
  7. mel08

    nodal reaction forces

    Is there a quick way to determine the total or sum of all the nodal reaction forces? I tried to use etable to list them all and then just ssum, but I couldn't work it with etable..... thanks.
  8. mel08

    determining apparent stress

    Hi all, I have a structure, which is highly porous. I've attached an image to try to show the structure and mesh. I'm applying uniaxial compression by load displacement to only the top nodes (the bottom nodes are fully constrained). We want to look at localised stresses/strains with respect to...
  9. mel08

    convergence issues

    Thanks Jalil, yes, in my output i have a note that plastic strain exceeds 5% and then begins bisection. The solution eventually converged, but I think that this cutcontrol will be very helpful!!! Thanks!! Mel
  10. mel08

    convergence issues

    Hi, I'm modelling a structure using a bilinear material model. At yeild, the tangent modulus is set to 5% of initial modulus. I'm having problems with my solution converging. The force appears to converge, but not the displacement. I am guessing that this is because once my modulus is...
  11. mel08

    asymmetric material model ls dyna

    Thanks for the link, I'll have a look and see!! Thanks, Mel
  12. mel08

    asymmetric material model ls dyna

    Hello, I'm trying to model a material in ansys ls dyna. The material is essentially elastic plastic, but the yield strains are different in tension and compression. I was wondering if anyone could suggest a material model i could use. When modelling it in ansys classic the only model i could...
  13. mel08

    error message

    thank you. I found the problem. I had an error in defining the tension data of the material model. Thanks again.
  14. mel08

    asymmetric failure criteria.

    Hello, I would like to model a material that has a higher yield strain in compression than in tension. The linear region has the same modulus for both tension and compression. Post yield I wish to use kinematic hardening. Could anyone tell me what is the best material model to use for this...
  15. mel08

    error message

    Could anyone please explain why I would get this error?? Cast Iron tension local NR algorithm does not converge Thanks in advance.
  16. mel08

    bilinear constitutive material model

    ...all the variables used have been defined previously. But when i try to solve the problem i get the following error messages: *** ERROR *** CP = 22.312 TIME= 14:36:30 For material 1 at temperature 0, the initial slope (120.8223) of the stress-strain...
  17. mel08

    determining equivalent stress and strain

    I have a structure which is being uniaxially compressed. I can get the nodal stress and strains, but wondered if there was a way I could find the apparent/equivalent stress and strain of the whole structure. I was told this would be the summed average of the nodal stress in the component(ie...
  18. mel08

    Contact problem - negative or zero pivot

    Hi cbrn. I followed your advice and constrained the nodes of the plate in the x & y directions. I now can get a solution, but the plate does not stay stuck to the top of the bone, instead the plate moves through the bone, so I don't think that contact is actually ever detected. I think that my...
  19. mel08

    Contact problem - negative or zero pivot

    Thank you to both of you for your responses. Yes it is a static analysis. I will try placing displacement constraints onto x & y. The bone is essentially a cube, but it has a complex geometric structure of plates and rods, so I won't can't use any sort of symmetry for the model (would be...
  20. mel08

    Contact problem - negative or zero pivot

    ...set the keyopts as: keyopt,4,2,2 keyopt,4,5,3 keyopt,4,9,1 keyopt,4,10,5 keyopt,4,12,5 When i enter cncheck,status I get the following output: *** NOTE *** CP = 14.344 TIME= 13:31:24 Deformable-deformable contact pair identified by real constant set 3...

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