High velocity particle impact negative volume issue.

Ansys / LS-DYNA Help Forum

Last Post by Jash 11 months ago

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Jash

Topic starter

February 5, 2024 5:58 pm

(@jash)

Barista

Joined: 11 months ago

Hi,

I am currently running into an issue where I am getting negative volume errors for my impact simulation. My whole particle is being deleted. I want to see the full deformation of the particle on the substrate when it impacts.

Model Info:

I am trying to model the impact of a 20-micron-sized aluminum particle on an aluminum substrate at 1000 m/s.
*ERODING_SINGLE_SURFACE with SFSA = 100, EROSOP = 1, DEPTH = 2.
Johnson Cook material model.
Both particle and substrate as *SECTION_SOLID, with ELEFORM = 0
*HOURGRASS with all default values.
*CONTROL _TIMESTEP is also all default. My termination time is 1e-4 ms.