General Mechanical

General Mechanical

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

    • 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

    • 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
    • ssagar
      Subscriber
      Thank you very much. I used the Johnson Cook Failure Criterian
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