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  1. compositesFEAguru

    Cohesive (zero thickness): NODE NUMBERING MIDE NOT BE CORRECT

    For your cohesive layer, first create the part with a thickness and mesh using cohesive elements (COH3D8). Second, assign the stack direction to the part with thickness so you can pick surface easily. Third, without converting to an orphan mesh, use the edit mesh tool to offset nodes from one...
  2. compositesFEAguru

    Cohesive (zero thickness): NODE NUMBERING MIDE NOT BE CORRECT

    Steven - I do this type of modeling quite a bit but have never converted the part to an orphan mesh. You can modify the nodes on a meshed part that is associated with a part without converting to an orphan mesh (might complicate things?). Also, check that stack direction is consistent across...
  3. compositesFEAguru

    orthotropic lamina properties

    Mike - This calculation gets rather complex and probably can't be expressed too easily in a single equation. I would look into obtaining a composite laminate analysis software package. Firehole Composites www.firehole.com
  4. compositesFEAguru

    THE *FAIL STRESS OPTION CAN ONLY BE USED WITH PLANE STRESS ELEMENTS?

    @Mohcine - You can connect with me on LinkedIn by clicking on the link on the right side of our blog (http://info.firehole.com/blog). You are most welcome! Firehole Composites www.firehole.com
  5. compositesFEAguru

    Viewing delamination/ matrix cracking in Abaqus?

    You should be able to view just the damaged elements by creating a Display Group (Tools - Display Group). Select Elements under Item and Result value under Method. You can then adjust the type of ranges you want to see (for example all elements with DMICRT >= 1). Firehole Composites...
  6. compositesFEAguru

    Export Abaqus model

    I did not see .odb on your list. You will need this file to view your results, unless you plan on re-running the analysis on your laptop. In my opinion, you should transfer everything, you will never know when you'll need the other files. Also you may be running a newer version of Abaqus on...
  7. compositesFEAguru

    Viewing delamination/ matrix cracking in Abaqus?

    Glad to help! Good luck with the rest of your project, I would be interested to hear about how your results turn out. Firehole Composites www.firehole.com
  8. compositesFEAguru

    Viewing delamination/ matrix cracking in Abaqus?

    Try specifying DMICRT instead of the HSN--- output variables. Firehole Composites www.firehole.com
  9. compositesFEAguru

    Viewing delamination/ matrix cracking in Abaqus?

    Copy and paste the following keywords from your input file that did not run: *Damage Initiation Everything under **Output Requests (I'm assuming you created this input file using CAE) Firehole Composites www.firehole.com
  10. compositesFEAguru

    Viewing delamination/ matrix cracking in Abaqus?

    If you want to use the Puck failure criterion you have two options: 1. Write (or obtain) a VUMAT. The output variables you view would be defined within the VUMAT and would have a SDV1, SDV2, etc. label. 2. Use a 3rd party software product for composite material analysis with Abaqus that...
  11. compositesFEAguru

    Viewing delamination/ matrix cracking in Abaqus?

    How are you attempting to use the Puck failure criterion right now? As far as I know, it is not available in Abaqus...? Firehole Composites www.firehole.com
  12. compositesFEAguru

    Viewing delamination/ matrix cracking in Abaqus?

    Section 31.5.6 in the Abaqus Analysis User's Manual will help. You will want to output MAXSCRT and QUADSCRT and see when those values reach a value of >=1.0 (failure initiation). Firehole Composites www.firehole.com
  13. compositesFEAguru

    Issue with time scaling

    That all seems correct. I'm not sure why you would be getting the message "results for the current deformed variable are not available for one or more nodes contained in the model. deformations at such nodes are assumed to be zero". Look for any additional errors/warnings in your .dat, .sta...
  14. compositesFEAguru

    Issue with time scaling

    Copy and paste your *Amplitude and *Dynamic keywords so I can look at how you are defining your amplitude. Firehole Composites www.firehole.com
  15. compositesFEAguru

    Issue with time scaling

    You need to apply the displacement BC with an amplitude curve. Firehole Composites www.firehole.com
  16. compositesFEAguru

    Issue with time scaling

    Hi Nick, Try applying a finite displacement boundary condition with a ramped amplitude curve (default in Explicit is step) instead of a velocity. Using the same time step, see if everything looks correct, then move on to velocity. It may be easier to resolve contact, density, etc. potential...
  17. compositesFEAguru

    Viewing delamination/ matrix cracking in Abaqus?

    Hi Mohcine, Share some more details on how you are modeling this impact simulation: - How are you modeling the composite plies? Solid or Shell? Layered elements (multiple plies in one element using a composite layup) or 1 element per ply? - How are you using the Puck failure criterion? I...
  18. compositesFEAguru

    THE *FAIL STRESS OPTION CAN ONLY BE USED WITH PLANE STRESS ELEMENTS?

    Didn't know you were using Explicit. Sorry but I am unfamiliar with Explicit and the errors associated with it. Firehole Composites www.firehole.com
  19. compositesFEAguru

    THE *FAIL STRESS OPTION CAN ONLY BE USED WITH PLANE STRESS ELEMENTS?

    Hi Mohcine, Are you modeling progressive damage using the Hashin failure criterion? Do you have nonlinear geometry turned on (NLGEOM=YES) in *STEP card? Both of these things could be causing element distortion errors. You may not be seeing it for 3D solids because you are not modeling...
  20. compositesFEAguru

    Difference Between Composite Section in (assign section) and Composite Layup in ABAQUS

    Hi Isyhadh, Section 2.4 in this document may be useful: http://www.firehole.com/documents/HeliusMCT-Tutorial-1-Abaqus.pdf Regards Firehole Composites www.firehole.com

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