Solid bullet impacting a shell plate, with the plate failing using Johnson-Cook material model. Having trouble with eroding contacts. Tried this same model using automatic surface to surface contacts and it works well enough until the shell starts failing, then I get massive spikes in internal eroding energy which massively alters the total energy of my material, followed by negative volume problems. So I tried eroding contacts and that has the problem of elements failing before contact is made. I am not sure what wrong.
When you say eroding contacts, what card are you using specifically? You can use *Mat_Add_Erosion to a part and define a cutoff strain value where the element will erode.
Hi !
I have the same problem trying to simulate an impact of a cyliner in Mat_NULL (solid elements) on a plate in MAT_PIECIWISE_LINEAR_PLASTICITY (shell elements). I don't know where the issue comes from. The contact is ERODING_NODES_TO_SURFACE.
What are you trying to replicate specifically? Do you just want the elements to erode when they contact the plate? The issue you are probably having is that *Mat_Null doesn’t carry stress so there is no way for it to erode maybe? Try using an Elastic material as a test instead for the cylinder.
OK !!! I will try using the ELASTIC_FLUID so !
I was also trying different contacts for the same lagrangian simulation, but it seems I don't know which one work well... Do you have any suggestion ? (CONTACT that I can use with MAT_NULL and MAT_ELASTIC_FLUID )
Thks
Well it's a fluid cylinder hitting a metallic and bounded plate.
And you want the fluid elements to erode when they impact the wall?
Why don't you try an SPH simulation? That seems more reasonable for what you are looking to accomplish. Below is an example that seems an a lot like what you are trying to simulation which you can use as a guide for your sim.
https://www.dynaexamples.com/sph/bar-v
There's also this example comparing lagrangian and sph