question about crack softening failure and Fracture energy

- March 27, 2018 at 8:43 am
  
  azdeen
  Subscriber
  
  Hi Dear friends
  
  I need your help. Just one question.
  
  I modeling SFRC beam under impact load using ANSYS v15 Dynamic Explicit. When I added the crack softening failure to run the solution with different values of Fracture energy input parameter Gf but unfortunately all out solution were similar.I think there's something wrong.
  
  Could you help me please.
- March 27, 2018 at 11:13 am
  
  peteroznewman
  Subscriber
  
  Can you share your model? If so create an archive by using File, Archive in Workbench to create a .wbpz file which you can attach to your reply. The file size limit for attaching is 120 MB. If your file is over the limit, you have to Clear Generated Data from the Model (or Mesh), Save (or Save As to a new name), and then File, Archive to create a smaller file.
- March 27, 2018 at 4:33 pm
  
  azdeen
  Subscriber
  
  Thanks for reply dear peteroznewman ... you find attached the my model file. I hope that you help me to get finally hammer time velocity charts with different values of input parameter Fracture Energy Gf using AUTODYN RHT Explicit Dynamic in ANSYS v15.0.
- March 27, 2018 at 5:07 pm
  
  azdeen
  Subscriber
  
  Send me please your E-mail because I'm not able to attach it here!
- April 3, 2018 at 3:43 am
  
  peteroznewman
  Subscriber
  
  Hello Azdeen,
  
  I ran your ANSYS 15.0 model and have some observations.
  
  1) Analysis Settings Maximum Energy Error is set to 99999. That means the error in your solution can be huge. You should use a default value.
  
  2) Analysis Settings, Erosion Controls, you have Yes for On Geometric Strain Limit and Yes On Material Failure. It would be best to only rely On Material Failure.
  
  3) Analysis Settings, Output Controls, Number of points is 50. It would be better to have a much higher number like 500 or more.
  
  4) Mesh is too coarse. I will refine it.
  
  5) End Time is too long. I will shorten it.
  
  Question
  
  A) Do you have the papers referred to in the material model? Can you explain how this material model works?
  
  Riedel et al."Penetration of Reinforced Concrete" ISIEMS'99 pp315. Riedel W. "Beton unter dynamischen Lasten" Ed. Frauhhofer EMI, IRB-Verlag, 2004, ISBN 3-8167-6340-5
  Riedel, et al. "Numerical Assessment for Impact Strength" IJIE 36 (2009) pp283.
  
  Why do you expect Fracture Energy Gf to have an effect in this simulation?
  
  Attached is an ANSYS 15.0 archive of your original model. When I get some improvement, I will post with an update to the model.

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