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thread calculation

thread calculation

thread calculation

(OP)
Hi all

for a research project, I want to calculate the stress in the root zone of some threaded elements. I am trying to find the best way to do this. I used spring elements between mating thread surfaces (in combination with non-linear material), but i want to try this using slide line contact, as I assume this is more realistic. However, I get an error and as i never used this elements before or performed this kind of non-linear analysis, I don;t know what i am doing wrong.
can anyone suggest what i am doing wrong?

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