Learning Forum

[JASH RANA]

Hi I am trying to run a particle impact on substrate simulation, but I am running into an issue where my particle goes straight through my substrate. My particle has a 20 micron diameter and is travelling at 600 mm/ms. Im using mm, kg, and GPa for my units. I am using a surface to surface contact, with the Johnson cook material model. I have included a images of my contact set-up and material model parameter. Any help would be greatly appreciated. Thank you!

 

[Jim Day]

For high velocity impact, you may need to reduce the time step as the default time step does not take into account initial velocity.   Distance traveled will be 

x = v dt

Let v be the initial velocity, x be some small fraction of your element size, say 1/100th the element size, and dt be the time step size you should not exceed.   You can use a curve (variable LCTM in *CONTROL_TIMESTEP) to set a cap on the time step size.