I am modelling an impact on a Ti64 block. The impacting particles are rigid and the Johnson-Cook material has been used for the block.
I am wondering how to calculate erosion; I want to analyze the effect of impact angle, and I know it from experiments, where the erosion increases as the angle increases and reaches a peak in around 40 degrees and then it begins to decrease as the angle increases. But, using SPH, it just increases and reaches its peak around 90 degrees; as a matter of fact it behaves like a brittle material rather than a ductile matterial. I use Vol Fail in post processing to calculate erosion, giving the Effective plastic strain a threshold of 0.14. But the results do not correspond to those of experiments. Is there another way to calculate erosion or the problem is with the modelling?
You may want to use the damage parameters in Johnson Cook model instead of defining only the plastic strain as the failure criteria.
Dear Mohammad Ali,
Here is an example of the erosion test and its description using LS-DYNA, please check this link.
https://www.dynaexamples.com/introduction/examples-manual/contact/eroding
Also take a look at links and attached file on topic.
https://pdfslide.net/documents/mat-add-erosion-mat-mat-add-erosion-ls-matadderosion-mat-ls-dyna-version.html
Book Urban habitat constructions under catastrophic events
Best regards
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