Article provided by: Dyson Corporation
In military aeronautics, the structure of an aircraft consists of a variety of parts manufactured from sheets, profiles, tubes, and other components that are joined together to form subsets, which together will build the aircraft.
A critical factor in the construction of these aircraft are the military fasteners. These clamping elements allow the union and interaction of the different pieces of manufacture. The first classification of these joints is in permanent unions and removable unions. In the first, there is no possibility of separating the sections, unless one of them breaks. In the latter, the disassembly can be done without damaging any of the parts involved (for maintenance or replacement) and then reassemble.
Another way to classify them is in rigid or elastic. The rigid ones produce an assembly of pieces that do not allow any movement between them, and they behave as a single element. The elastic or power joints will enable the possibility of a relative displacement between some of the parts of the assembly, which occurs when you apply a force at some point of the piece. Once the effect disappears, the piece returns to its original position.
There are also different methods of fixation. For permanent joints, you can use procedures such as welding, direct threading, clamping, or stapling. In the case of non-permanent unions, various military fasteners are available, such as bolts, screws, rivets, and specialized glues.
In the case of metal pieces for the military industry, their alloy is different from the fasteners used for other types of structures, such as anchors, bridges, and constructions. The aircraft bears particular pressures and stresses, and the strength and elasticity of the alloy must withstand such work. Also, exposure to elements such as seawater makes the manufacturer use methods to prevent rust and corrosion, and thus ensure the useful life of the piece.
The ideal in aeronautics is to generate unique pieces of the same material. However, the technology of today still does not allow it, and for that reason, several pieces must be elaborated to build each part of the airplane (wings, fuselage, tail). That is why military fasteners are critical elements in construction since they partly determine the success of the development of an airplane.
In general, these are the main aspects that must be taken in mind when designing a union of aeronautical parts, to avoid structural failures:
Eccentricities and their effect on the union, and on nearby pieces. It is essential to study the structure as a whole because, at the moment of occurrence of the eccentricity, adjacent structures support the moments and loads.
Have a uniform criterion in the use of fasteners. If you use a combination of elements (screws and rivets, for example), the distribution of loads will not be uniform, and this will produce overload on the most resistant components.
- The efficiency of the union. You must consider both sides of the structure. The idea is not to create a perfect union on one side, penalizing the other one. The final design must have a uniform load distribution.
Once you determine the design, Dyson Corp is ready to make the necessary fasteners to make your military structure. With our more than 125 years of experience assisting the manufacture of military machinery, we can produce fasteners, forgings and bar to MIL, ASTM, and SAE specifications for any government or military Project. Contact us, our team of experts is ready to meet your requirement.
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