MAT295 is not implenmented for SPH section

- October 18, 2023 at 5:13 am
  
  hansenli
  Subscriber
  
  Hi,
  I received this error when I tried to use MAT295 for an SPH section:
  Error 30281 (INI+281)
  SPH initialization
  Material number 1
  material type 295 is not implemented
  Is that this model is not compatible with SPH section? Do you have other methods to incooperate the volumetric effect into a hyperelastic model for bio related material?
  
  Thanks!
- October 18, 2023 at 2:15 pm
  
  Ram Gopisetti
  Ansys Employee
  
  Hi Hansenli,
  Check the following link for compatible material model for SPH
  https://lsdyna.ansys.com/dynamat/
  *MAT_176 can be the potential candidate.
  Cheers, Ram
- October 18, 2023 at 3:41 pm
  
  Jim Day
  Ansys Employee
  
  Hyperelastic materials and SPH typically don’t go together very well. SPH suffers from tensile instability, which means the material will have a tendency to break apart instead of deforming in tension. And as Ram mentioned, dynamat (based on information at the beginning of the *MAT section of the LS-DYNA User's Manual) indicates that SPH can't be used for MAT_295. If you're intent on using MAT_295, you could instead try EFG or SPG.
- October 19, 2023 at 4:12 am
  
  hansenli
  Subscriber
  
  Thank you for your advice! SPG cannot be used for MAT_295 either. Is there an update about this in the latest version. We are currently using R12 version.
- October 19, 2023 at 2:44 pm
  
  Jim Day
  Ansys Employee
  
  I'm unable to say with any certainty. To best answer that question, download version R14.0.0 and try it.

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