Abstract
In order to design a reasonable thread connection structure, it is necessary to understand the axial force distribution of threaded connections. For the application of bolted connection in mechanical design, it is necessary to estimate the stiffness of threaded connections. A calculation model for the distribution of axial force and stiffness considering the friction factor of the threaded connection is established in this paper. The method regards the thread as a tapered cantilever beam. Under the action of the thread axial force, in the consideration of friction, the two cantilever beams interact and the beam will be deformed, these deformations include bending deformation, shear deformation, inclination deformation of cantilever beam root, shear deformation of cantilever beam root, radial expansion deformation and radial shrinkage deformation, etc.; calculate each deformation of the thread, respectively, and sum them, that is, the total deformation of the thread. In this paper, on the one hand, the threaded connection stiffness was measured by experiments; on the other hand, the finite element models were established to calculate the thread stiffness; the calculation results of the method of this paper, the test results, and the finite element analysis (FEA) results were compared, respectively; the results were found to be in a reasonable range; therefore, the validity of the calculation of the method of this paper is verified.
Highlights
The bolts connect the equipment parts into a whole, which is used to transmit force, moment, torque, or movement
Based on the Yamamoto method, Dongmei Zhang et al [1] propose a method which can compute the engaged screw stiffness by considering the load distribution, and the validity of the method was verified by finite element analysis (FEA) and experiments
This study provides a new method of calculating the thread stiffness considering the friction coefficient and analyzes the influence of the thread geometry and material parameters on the thread stiffness and analyzes the influence of
Summary
The bolts connect the equipment parts into a whole, which is used to transmit force, moment, torque, or movement. Motash [4] assumed that the pressure distribution on any plane perpendicular to the bolt axis had zero gradient at r = dh/2 and r = ro, where it vanishes They mainly use numerical methods to calculate the influence of different parameters on the stiffness of bolted connections. Based on the Yamamoto method, Dongmei Zhang et al [1] propose a method which can compute the engaged screw stiffness by considering the load distribution, and the validity of the method was verified by FEA and experiments. The friction coefficient of the contact surface of the thread connection has an influence on the distribution of the axial force of the thread and the stiffness of the thread. We propose a new method which can compute the engaged screw stiffness more accurately by considering the effects of friction and the load distribution.
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