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[jacopo <question671364@xxxxxxxxxxxxxxxxxxxxx>]

Question #671364 on Yade changed:
https://answers.launchpad.net/yade/+question/671364

    Status: Answered => Open

jacopo is still having a problem:
Ok Thanks. Now i 'm using The stl file as a text . I mean , i create a
file.txt holding all the aircraft facets positions. In this way i could
rotate And traslate their positions easily ( The original file.stl/gts
had a wrong orientation) . Now i need To give movement To The aircraft.
I have To use The traslation engine. I think To create a list of facets,
use The translation engine On this list, And set the contacts between
soil( spheres bodies) And aircraft.

-> do i have To clump the facets creating a rigid body? Becouse now i
don t know if they will stay togheter during the impact .

-> do i have to reconvert My file.txt in a file.gts? In this way you
told me the aircraft Will act a rigid body. I would like To see the
aircraft deformations, And register the forces acting on the aircraft
center of gravity.

-> I know the facet-facet contact doeSn t exist. How can i do?

I know IT S a long project, But i would like To know which Is the best way to follow Becouse i have many ideas about IT, But i don t know if Are possible To do. Thanks for your attention
________________________________
Da: bounces@xxxxxxxxxxxxx <bounces@xxxxxxxxxxxxx> per conto di Robert Caulk <question671364@xxxxxxxxxxxxxxxxxxxxx>
Inviato: giovedì 9 agosto 2018 18:37:39
A: Jacopo Varriale
Oggetto: Re: [Question #671364]: aircraft crash test

Your question #671364 on Yade changed:
https://answers.launchpad.net/yade/+question/671364

    Status: Open => Answered

Robert Caulk proposed the following answer:
Hello,

>>
but in this way, the model would not reproduce exacly the real aircraft
>>

I do not believe there is an easy way to assign "material" properties to
different parts of an STL import. However, in my opinion, you've already
made bigger simplifications to this "aircraft impact scenario" that will
overshadow any improvement in accuracy that might be gained from
assigning individual material properties to different parts of the STL
import. For example, the STL import will behave as a rigid body no
matter what with the current version of Yade and I suspect you are using
soil comprised of beachball sized soil particles :-).

Cheers,

Robert

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