Week - 9 Material Modeling from Raw Data

Aim: Use the diagram of the true stress-strain curve of graphite iron casting. Two curves are there for different material structures. Students need to pick any one of them and use the data to create either a MAT_024 or MAT_018 material model and then validate it.

Procedure:

In this problem, the experimental data is given, which has to be applied to the material card in the LS_DYNA tool, so that it can be used for complex structures during structural analysis.

1)Initially, from the image the data points have to be extracted. The data points represent engg stress and engg strain.

2)LS-DYNA requires effective stress and effective plastic strain values.

3)So, using proper formulas we should convert the engg stress to effective stress and engg strain to effective plastic strain.

4)A proper curve fitting has to be considered

5)Now, add this data to the material card to validate the data.

6)Provide all the required B.C’s and control keywords.

Conclusion:

MAT_024 is used for simulation.

Simulated Stress vs strain %