Abstract
In order to predict the bolt’s stress distribution under the pre-tightening state and the loosening process under the transverse load, a 3D model considering the bolt thread structure was established by finite element method (FEM). In this study, the looseness effect of transverse load amplitude, the friction coefficient of the bolt head load bearing surface and the thread contact surface are mainly studied. The result indicated that the stress under bolt pre-tightening is mainly concentrated on the contact part of the bolt’s head and bar. At the contact area of the load threads at one end and the transition part between the bolt bar and the thread, the stress and axial direction of the thread part are offset. Under the transverse displacement load, the sliding of the bolt can be divided into three stages: full contact, viscous contact, and full slip. The numerical model of bolt relaxation obtained in this paper can provide reference for the application, checking and prediction of threaded fasteners.
Highlights
The bolted connection has the advantages of convenient assembly, reliable connection and good economy
In a working environment such as an automobile chassis fastening system, the bolts are subjected to dynamic loads transmitted from the wheels, causing a drop in the clamping force, resulting in abnormal noise, looseness, severe breakage, and a safety accident.[1,2]
In order to simulate the stress distribution of the bolt under preload condition, the finite element model is imported into the ABAQUS for calculation, the outer surface of bolt head and outer surface of nut are completely fixed, and release tangential freedom of the vertical axis from the side to the outer surface of the clamped plate.[25]
Summary
The bolted connection has the advantages of convenient assembly, reliable connection and good economy. In order to simulate the stress distribution of the bolt under preload condition, the finite element model is imported into the ABAQUS for calculation, the outer surface of bolt head and outer surface of nut are completely fixed, and release tangential freedom of the vertical axis from the side to the outer surface of the clamped plate.[25] The friction coefficient of the threaded contact surface is 0.12, the friction coefficient of the clamped plate lower surface and the friction coefficient of the bolt head upper surface are 0.15. When the thread reaches the yield point due to preload or external load, the load and contact changes of the thread, and the decline of preload still need to be further studied
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