Control of influence of a thread on a bending of screws

[摘要] The influence of the threads and the bending of screw on their moments of inertia of the cross section considered. This problem is actual since existing methods exclude from calculations the influence of supporting the thread, using as the basic geometrical parameter such as the internal diameter of the thread (diameter of cavities). Fundamental difference of a bend of the screw from a bend of a smooth rod consists that moment of inertia of the screw is a variable. It is shown that the change in cross-section moment of inertia along the length of the screw are essential and have periodic character. Analytical interrelation of the bending of the screw and the decreasing of moment of inertia of its cross section is established and equation describing this phenomenon is suggested. The greatest decrease of the moment of inertia occurs in the middle of the screw length, and the lowest - at its ends. Function and approximate coefficients for the main types of thread are proposed, which take into account this change.

[发布机构] Tula State University, Lenina ave., 92, Tula; 300012, Russia^1;Omsk State Technical University, Mira ave., 11, Omsk; 644050, Russia^2

[效力级别] 物理学 [学科分类] 力学，机械学

[关键词] Internal diameters;Moment of inertia;Moments of inertia;Periodic characters