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Screwing is an assembly process that enables two or more parts to be joined together in a dismountable manner, using fasteners. These elements consist of a screw and a nut, and possibly one or two washers. The nut can be formed by one of the two parts of the assembly, which is then threaded. An assembly consisting of a screw and a nut is called a bolt.
These elements act by pressure on the parts, this pressure being the result of the elastic deformation exerted on the element during clamping.
Screws are manufactured from cylindrical steel wires. Depending on their dimensions and the type of steel, screws are shaped by forging (plastic deformation) or screw machining (material removal).
Threads are produced by deformation (rolling) or machining (metal removal). A rolled thread is more resistant than a cut thread,...
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Principle
Resistance mechanism of a joint colléGlued joint
Bonding involves placing an adhesive between two parts. We usually distinguish between glues, which are traditional products of plant or animal origin, and adhesives, which are synthetic products for applications involving high mechanical stress (known as structural adhesives). The strength of a bonded joint is the result of two mechanisms:
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