Hi people,
I am here to inform that today I had good progress with this calculation.
I noticed that 2 major points are pretty important:
1-The correct specification of the SUPORT entry;
2-The request only for positive eigenvalues. For negative ones maybe some matrix turns ill-conditioned...
Thanks for all contributions... Didn't get any progress up to now, but I will keep you informed.
@BlasMolero: thank you, but flutter analysis is not the point here. Of course it will be performed, using ZAERO, but the point now is in fact buckling.
Regards.
@jhardy: That's true. I tried removing angular velocities and mode shapes are still weird (first 4 ones like rigid body). Looks like the solver can't split rigid bode modes from real buckling modes.
@rb1957: We are talking about a complete but simplified aircraft model. It is a composite...
Dear fellows,
I am writing to ask if anyone has any experience with buckling analysis considering inertia relief effects.
I ran some tests with small models to check if buckling modes considering inertia relief effects or SPC approach with fictional body loads should give the same result. It...
Hi all,
I was interested in knowing AL7050-T7451 mechanical properties after being heated to 180°C and cooled again to room temperature.
At MMPDS, I found a curve (Fig. 3.7.4.2.1), showed below:
At 180°C (356°F), strength is reduced, so I should have care about hot operation, but there is no...
Hello guys,
Please, I would like to know if is there a way to obtain a surface from a solid. I mean, I have an irregular solid and want to get just its outer face and make it into a surface.
I tried the "surface offset", but the resulted surface is dependant on the original solid (if I delete...
