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Hello
I have two geometry rectangular and hexagonal. I used same material and same mesh size for both.
why their time step is different.
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Hi,
the difference is because the characteristic element length is computed differently for shell and hexahedral elements:
-Quad Shell: The square root of the shell area
The critical length can vary with: • Shell formulation • Hourglass control parameters • Numerical damping • Membrane damping
-8-node Hexahedral: Volume / largest face area
I think the characteristic element length should be the same if element shape is close to ideal (square and cube), but could be different for distorted shapes.
Hi beytut
I recommend you to go through the RADIOSS ebook, Explicit analysis using Radioss (https://altairuniversity.com/free-ebooks-2/free-ebook-crash-analysis-with-radioss-a-study-guide/) where all the basics for explicit analysis including time step calculations are covered.
Thanks
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