TAGGED: -LS-DYNA-run-time, -quasi-static, implicit-dynamics
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September 20, 2024 at 6:50 am
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September 23, 2024 at 9:28 am
mohan.urs
Ansys EmployeeHey,
I noticed you have negative volume errors in about 20 elements. These errors in LS-DYNA usually occur when elements become excessively distorted during a simulation, leading to inversion and negative volume calculations. This can cause the solver to terminate if not addressed. Given the high strain rates in your flow forming simulation, I recommend the following adjustments:
- Mesh Density: Adjust the mesh density.
- TSSFAC (Time Step Scale Factor): In *CONTROL_TERMINATION, a higher time step means higher loads, leading to higher strain and distortions. Controlling this might help.
- ELFORM: Avoid fully integrated  brick element formulations; use 1-point Tetra element integrations for large distortions.
- Material Plasticity: Ensure the material properly captures plasticity and consider using mesh adaptivity.
- ERODE=1: Set ERODE=1 in *CONTROL_TIMESTEP or PSFAIL in *CONTROL_SOLID to delete highly distorted elements and obtain a solution.
- Hourglass Controls: Use better hourglass controls to avoid hourglass modes.
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