Frame Shapes for Aircraft Fuselage

[AF1307]

Hi, I'm trying to look into the benefits and disadvantages of different types of frame configurations for an aircraft fuselage assignment. The three options I have at the moment
1) is a mechanically fastened C+L Frames,
2)a Z Frame with some local pad ups on the web and
3)a one piece C+L Frame.

All parts are to be made from CFRP.

Structurally options 1 and 2 should be the most appropriate as the have a significant moment of inertia component. Whereas the 2nd option is not as structurally sound however, would be easier to manufacture. Option 1 would allow for ease of manufacturing but assembly time would increase. Whilst option 3 would be a little more difficult to manufacture and if the part fails to confirm and needs to be redone the material wastage is higher.

Are the points above valid and are there any other significant points I should consider?

Please see attached for diagrams.

Thanks

 

[Andries]

Hi,

Aircraft Engineering is the more appropriate forum in this case.

Andries

 

[drawoh]

AF1307,

What kind of airplane?

Design is a process of looking at all sorts of solutions and finding something that meets as many of your requirements as possible. Cargo space? Battle damage? Must look cool? Minimum mass? Minimum cost?

--
JHG

 

[dhengr]

AF1307:
I agree with Drawoh’s last para., as regards engineering design. Thank goodness, someone is finally going to invent the airplane frame and fuselage. Boeing and Airbus will certainly be able to use this study when they finally come along.

 

[JStephen]

AF1307,
"Structural" in this forum means buildings, bridges, that kind of thing, steel and concrete and wood and all.
"Airplane Structures" presumably goes somewhere else as mentioned above. But thus the dearth of useful replies.
Although the question seems rather general, so you may not find much more useful replies elsewhere, either.

Reading the question reminded me of this cool video that I saw a while back...won't answer your questions, but still cool.

https://www.youtube.com/watch?v=hpgK51w6uhk

 

[oldrunner]

I know that air frame structural questions are not quite appropriate for this forum, but when I was a young engineer, an aeronautic structural design textbook was in a very advanced structural engineering firm's office in SF. But I think that the focus was more on shells. We did get shells in school and when I graduated lots of shell design was being done. This was in the early 1960's.(Toroja, Candela and Nervi)

 

[MotorCity]

If you want us structurals to weigh in on the structural implications of your fuselage thingy, you're going to have to help us out and give us some photos or sketches of what you're talking about.

Whats a C + L frame?