Cut Approach - Sensibility
Hi,
I have an issue with cut approach (https://altairuniversity.com/learning-library/radioss-sub-modeling-cut-approach/).
I'm modeling an half of full vehicle with the cut approach above. From this sub-model, with hyperstudy I modify a little bit the geometry and study how the crash changes dynamic. I wonder how dynamics could vary among runs if the section-force imposes original displacements?
Many Thanks
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ok, let's suppose for instance that my changes were about thickness on the front rails for my vehicle. Thickness varies within few millimiters (about 3mm), but when It's thin, the car folds deeply against the wall, whereas if It's thick, the car folds a little and then has a rebound. With the cut approach I have imposed the displacement to the section force so that the car's dynamic is fixed, isn't it? In this way, I cant't appreciate differences due to the thickness changes, can I?
(Total mass isn't very affected from thickness changes (less than 1%), but stiffness might be)
Many thanks again for your reply
Hi,
if the geometry changes significantly it is possible the crash dynamic also varies from the original in:
It is difficult to estimate how much submodel affects the global model. This is why the reanalysis of the optimized global model is recommended.
RD-E: 5400 Cut Methodology Conclusion (from Radioss help):