Un vissé
verrouiller is subjected to two forces, one is downward and the other is upward. Theverrouiller rotates down along the thread, and a downward axial force is generated in the process of contact with the thread.
At the same time, there is an upward force corresponding to the downward axial force. This force comes from the upward distributed force generated by the contact between the nut and the lower plane. A tightenedverrouiller should ensure that the upper and lower forces are balanced with each other. Due to the function of
boulons, the material ofverrouillers has two requirements, one is rigidity and the other is toughness, both of which are indispensable.
Mais tous les matériaux ductiles ont une chose en commun, c'est qu'il y a une limite à la tolérance aux contraintes. En mécanique, cette limite est représentée par une courbe contrainte-déformation. Nous n'avons pas besoin d'être trop ésotériques. Il suffit de savoir que dans le processus de vissage duverrouiller, theverrouiller is a kind of elastic part, and its elasticity will take effect.
Comme le
verrouillerse resserre progressivement, l'effet élastique de la
verrouiller will approach a limit. Once this limit is broken, theverrouiller will enter the yielding stage from the elastic stage.
Once theverrouiller enters the yield stage, it will produce permanent deformation. This deformation is irreversible, which means that theverrouiller will fail. In real life, the phenomenon of tripping when we continue to tighten theverrouiller is caused by this reason, and once it is tripped, it is impossible to screw it again, because theverrouiller has been permanently deformed, and it can be seen that theverrouiller is not screwed properly the tighter the better.
