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Dynamic and Stability Analysis of Multibolt Plane Joints under Normal Forces

by Zhenyuan Li 1, Yimin Zhang 1,2,*, Changyou Li 1,* and Zhi Tan 3
1
School of Mechanical Engineering and Automation, Northeastern University, Shenyang 110819, China
2
Equipment Reliability Institute, Shenyang University of Chemical Technology, Shenyang 110142, China
3
Shenyang Machine Tool (Group) Co., Ltd., Shenyang 110142, China
*
Authors to whom correspondence should be addressed.
Appl. Sci. 2019, 9(24), 5521; https://doi.org/10.3390/app9245521
Received: 22 November 2019 / Revised: 7 December 2019 / Accepted: 12 December 2019 / Published: 15 December 2019
In this paper, a stiffness model of contact surfaces based on a modified three-dimensional fractal contact model is built, which is in accordance with the experiment results. Additionally, the static, dynamic, and stable behaviors of the bolt joint between the spindle box and the machine bed are analyzed. The mathematical relationship between fractal parameters of the surface topography and the stiffness of the system was established to accurately study its static behaviors. Asymmetric curves are observed from the load–deflection results and the nonlinear stiffness characteristic is also presented. It is shown that both the stress and the stiffness increase with the increase of the displacement near the static equilibrium position. Meanwhile, a simplified model without the consideration of roughness is compared with joint interfaces composed from milling, scraping, and grinding surfaces. Numerical calculation was employed to investigate effects of design parameters on the system under harmonic excitation when the processing method, excitation force, bolt pre-tightening force, topography parameters, and other structural parameters, i.e., nominal contact area, joint thickness and bolt number, are eventually regarded as the control parameters. The aim of the article is to analysis the influence of these parameters, including surface morphology, on nonlinear characteristics of the bolt interface with fractal contact surfaces andto provide some references to improve the characteristics. View Full-Text
Keywords: rough surface; bolt joint; nonlinear contact stiffness; dynamic behavior rough surface; bolt joint; nonlinear contact stiffness; dynamic behavior
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MDPI and ACS Style

Li, Z.; Zhang, Y.; Li, C.; Tan, Z. Dynamic and Stability Analysis of Multibolt Plane Joints under Normal Forces. Appl. Sci. 2019, 9, 5521.

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