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[Fernando Torres]

Hi Dear Community, 
I want to 'TiE' these solid layers down (1,2,3 as shown in picture) and study their collective response to a low velocity impact. I have used Tie contact(s) option but I'm not sure if I have used the correct options as after solution there comes an abrupt decline in stress values (to almost zero), which doesn't make any sense.
Thanks a lot!!

[Aniket]

Need some insights to tie shells with solid this is the same question, right?

-Aniket

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[Fernando Torres]

Well, partially yes. Only difference between both questions is that this one hs solid top and bottom layers, while other has top and bottom layers made of shells (with a proper space allocated for the thickness of the shells)...

[pedram.samadian]

Hi,

Did you use *CONTACT_TIED_SURFACE_TO_SURFACE?

Thanks,

Pedram

[Fernando Torres]

Hi Pedram, yeah actually I tried a bunch of options and they "worked" (worked in terms of taking the solution to termination time) but the stress behavior was strange as in a couple of time steps it suddenly decreases down to zero and I'm assuming here that there is something not right with the contacts as other provided data seems ok (material prop(s), bc(s), ic(s) etc) 

[Fernando Torres]

In order to further clarify...here is the graph. Yellow shows the "issue" where as the green line is "assumed" right...

[pedram.samadian]

 

 

Hi,

Thanks for providing more information. Which element has this stress history?Do you have any damage model or failure criteria in terms of the stress or strain level in your simulation? If the input hardening curves are accurate, the stress going to zero means the element deletion.

Pedram

 

 

[Dennis Chen]

@Fernando Torres are you willing to share your k file with me?