Dear experts,
I am new in modeling in LS-Dyna. In my master thesis, I must modeling solid particle erosion in metalling surface. In this modeling, solid particles impact a surface and make microcutting in the surface. In my model, I used Johnson-Cook material model with failure. When I run the model, solid particles impact surface and the element which in the surface are deleting. But I want to micro grading in the surface. So I do not want to delete the element on the surface. I want the elements to break in mesh regions. There is a video about micrograding at below. In the video the element broke in the mesh region but did not deleting.
https://www.youtube.com/watch?v=t3h4ElgOupc
Also there is one video again
https://www.youtube.com/watch?v=4pOmdq87VU8&t=311s
In that video, the element did not delete again but broke in the mesh region.
Bu these videos, What will I do? I used Johnson Cook. From D1 to D5 parameters in the Johnson-Cook, Which parameters I must use?
Thanks for yor helps.
Start with a simple model that you can corroborate with data that everyone agrees on, and then run it using different erosion models. At this stage, I wouldn't worry about -having- to use a particular one (e.g., Johnson-Cook), but I would want to find one that gives good results and that is workable / solveable. If you can solve that simple model with J-C and the results agree with the agreed-upon data, then you'll have your JC constants from that exercise. If you need additional help in deriving these constants, then I'd contact your tech-support person from LSTC, if that is available to you (sometimes there is only one person at the university that the software provider will work with - you'll have to ask around if that is true for your university). Hope that helps.
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