Fuselage Splicing

[Mkhairy]

I've seen many videos for fuselage construction of huge commercial airplanes . they build the fuselage into many small stiffened panels that are assembled together to form mail complete cylindrical sections . later 3-4 cylindrical sections are assembled together. so here is my question, how could they fix those section together though a very small area of the skin only i can't imagine that this will hold the huge bending stress on it. could anybody explain how this assembly is done

 

[KENAT]

Research longerons, frames, stringers, bulkheads... which are all structural components of the fuselage 'under the skin'.

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[rb1957]

splice joints are carefully designed to provide load continuity. the skin stiffeners (stringers) are joined (and this is most of the bending strength) with short splicing pieces. Sometimes the stringer joint is offset from the skin joint, but sometimes it's a clean break and join.

another day in paradise, or is paradise one day closer ?

 

[WKTaylor]

mkhairy...

Michael CY Niu Airframe Structural Design [Practical Design Information and Data on Aircraft Structures] Chapter 11 may have the examples You want to understand [fuselage joints]. This book is readily available for ~$60--100 on-line [used, new]... and is worth every penny for a new designer!

Michael CY Niu has two other books worth buying...

Airframe Stress Analysis and Sizing
Composite airframe structures: practical design information and data

Regards, Wil Taylor

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o We believe to be true what we prefer to be true. [Unknown]
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[Mkhairy]

So , is just splicing the skin and the stringers enough to hold the whole fuselage section ? another question if u don't mind.. are the longerons extended along the whole fuselage connecting all the fuselages section together or it's just extended through each section only ?

 

[Mkhairy]

WKTaylor

Wow Thank you , I really appreciate it .

 

[rb1957]

longerons are "just" heavy stringers. Typically they reinforce local areas (like door cut-outs). They'd be spliced at joints like anything else is. The spliced structure is capable to carry the load, it is the art of design to make these splices efficient.

another day in paradise, or is paradise one day closer ?