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Unexpected penetration of striker (Charpy Test) in SPH Form 12 Specimen – LS-DYNA

- October 7, 2020 at 1:41 am
  
  ssagar
  Subscriber
  
  Hi,
  
  I am performing the Charpy Impact test on a Nickel Based Superalloy Inconel 718. I used SPH Form 0 initially in LS-DYNA however, the specimen fractured based on tensile instability. So I decided to use Form 12 which is expected to take care of Tensile Instability.
  
  Using Form 0, there is no penetration of the 5 m/s striker, however with the Form 12, the striker is going through the specimen.
  
  Can you kindly indicate where I am going wrong. The picture shows the difference.
  
  Thank you,
  
  S
- October 8, 2020 at 4:36 pm
  
  Chris Quan
  Ansys Employee
  
  Make sure the material model of the Nickle Alloy has damage or failure criterion. If not, use *Mat_Add_Erosion to add material failure model to the Nickle so its material strength will not be over-predicted. n
- January 22, 2021 at 3:35 am
  
  ssagar
  Subscriber
  
  Thank you very much. I used the Johnson Cook Failure Criterian

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