Can Inventor Nastran Explicit dynamic analysis do the collision analysis
Accepted solution
Note that Explicit Analysis in Inventor Nastran is still a Tech Preview. The help file contains 2 other tutorials.
There's no information in the help about Element Deletion settings. I don't have any information about that either. The video below shows you how to setup and run the Explicit Dynamic analysis.
TLDR; see attached example if you just want "something that runs" to try out explicit analysis. It's not an accurate model but it should work.
So... Just in case anyone else is having the same problem I was.....
I have tried to do impact analysis several times since the explicit solver was released. The results always looked terrible and I assumed I was doing something wrong with the simulation setup. I eventually realised that the mistake was not with the simulations, they were mostly running just fine as it turns out. The mistake was with the plotting. For some inexplicable reason, the default is to deform the model based on the first field available in the results, in this case acceleration. Once I changed it to deform the model based on the DEFORMATION it worked perfectly.
Perhaps I'm just unimaginative, but I can't think of any circumstance where I would want to deform an explicit analysis based on anything other than the deformation results! Why this is even an option is beyond me, but the default option?! Also I think 1:1 actual deformation should be the default for all simulations, especially explicit. Please stop confusing new users!!!
Two very silly defaults
And the very silly plot they produce VS The plot every new user wants to see
Hi @ambrose, question from your results. If the Nodes are this distorted, how would you know what's the deformation in particular Location? Looking at color coding and approximation is the best option?
Also, second question. If your plate was a weldment, do I need to give bonded solver contact as well like in Ansys? But, It's not resolving/solving anything if I do that. Adding you as well, @Roelof.Feijen @John_Holtz. If you can help. I'm trying to do a drop test of 340 KG load from 62 inches on a weldment. So Vf=221 in/s. Interested to find out deformation of weldment items in drop direction/Towards floor. Attaching file below.
It has both separation and bonded solver contact but the load seems to be passing through the weldment and all the Von-mises are showing negative mostly.
Also, if I Auto generate the bonded contacts and manually give separation for load and weldment it's not solving at all. Basically no errors but doesn't generate any results. @John_Holtz
Hi @apatel4FM8K, to view the displacement at a particular location you can add a probe. Click on "probes" while viewing the results and then click on the location you want to inspect.
I am not the best person to answer your other questions. Hopefully someone else can help.