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Brittle Failure damaging material model in Abaqus

Hello everybody i m working on a project Fem erosion analysis of brittle ceramic material using Abaqus/Explicit . I know for brittle material especially Jhonson Holmquist model is best suited , but unfortunately its not available in abaqus . So finally i decided to go  with brittle cracking criteria . Can Anybody helpme to use this criteria of brittle cracking

I need parameter of this criteria like

1 .Brittle Cracking >> Type GFI>>1 . Failure Stress 2. Mode I fracture energy

2. Suboptions>> Brittle Shear>> 1. Shear retention factor 2. crack opening strain

3. Suboptions>> Brittle Failure>>Direct Cracking Failure Strain or Displacement.

For Materials like Al2O3(Alumina) SiC(Silicon Carbide)

I tried much to get the data for these materials but still i dont have the success..

plz im in great need i hav to complete my PG project to pass.,

 Or here on Imechanica who can write subroutine For Jhonson Holmquist JH-2 model

i have all equations for the JH-2 model along with the data to be used for this  model

 

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