Contact modellization

[MarcoMadrid]

Hello to everybody,

I am new with Abaqus, i am making a static analysis on a cylindrical fuselage of a rocket with a cover. The rocket is attached to a subwing pylon that transmits an important load to the cover (by the rocket release mechanism)at the launch (that's an UAV launched by catapult). Well, i made the analysis, no error. Sounds fine, but i have just a doubt about contact modellization. Contact between cover internal surface and the edge of the cavity under the cover.
Cover is fastened to the fuselage in four points.
I used:
10 nodes tet elements
slaves surfaces with a finer mesh than master region
tg behavior: frictionless
normal behavior: hard
and: allow separation after contact - yes

Any suggestion from your experience about this? I'm reading the manual, it explains such things, but i am not really sure of what is better.
Than You
Marco

 

[MarcoMadrid]

Hello there,

I have a question...i refined my model...and after analysis y see that deformed shape (at at the computed scale factor) shows a compenetration between fuselage board and the cover. I expected that forces and so desplacement would be trasmetted from one part to the other, in order to have the same grafic result. The fuselage, at taht point, in in "expansion", the cover is in compression, but they seem don't work togheter. I defined the contact as i said in the first post.
I appreciate every suggestion.

Thank You,

Marco

 

[portliner]

you better send some pics on the model

 

[MarcoMadrid]

Here some pics...

Another thing i noticed... ALLSD/ALLIE=11% isn't it a little bit too high?

Thanks guys

http://files.engineering.com/getfil...d93e7&file=Abaqus_analysis_cover_fuselage.JPG

http://files.engineering.com/getfil...&file=Abaqus_analysis_cover_fuselage_MPCs.JPG

http://files.engineering.com/getfil...s_cover_fuselage_displacement_constraints.JPG

 

[MarcoMadrid]

And here i leave a job monitor shot at the end of analysis...

http://files.engineering.com/getfil...c-424b-8a6c-0c5d23d8fde0&file=job_monitor.JPG

ML