Research on Self-Loosening Behavior of Bolted Joints under Eccentric Excitation

doi:10.3901/JME.2018.14.074

Abstract

Abstract: Based on a new bolt loosening test rig, the loosening tests of bolted joints subjected to eccentric excitation are carried out under various experimental parameters. According to the evolution curves of the axial force of the bolt, the self-loosening behavior of bolted joints under eccentric excitation is investigated. After the tests, the damage of threads is analyzed using OM (optical microscope), SEM (scanning electron microscope) and EDX (energy dispersive X-ray). The influences of fretting behavior (micro-slip and fretting wear) between the contact threads on self-loosening of bolted joints are discussed in depth, and the self-loosening mechanism of bolted joints is revealed in details. The results show that the axial force of the bolt decreased obviously, while the breakaway torque has no obvious change. The self-loosening process of a bolted joint can be divided into two stages:Firstly, the axial force of the bolt drops rapidly due to the removal of asperities on the contact surfaces and the plastic deformation. Secondly, because of the ratcheting of material, plastic deformation increases slowly, and fretting wear between contact surfaces is the main reason of the decrease of the axial force of the bolt. The main wear mechanisms of the contact surfaces between threads were delamination, abrasive wear and adhesive wear. In addition, numerical simulation was performed using ABAQUS, and the FE results are agreement with the experimental observations.

Key words: bolted joints, eccentric excitation, fretting wear, self-loosening mechanism

CLC Number:

O322
TH117

DU Yongqiang, LIU Jianhua, LIU Xuetong, CAI Zhenbing, PENG Jinfang, ZHU Minhao. Research on Self-Loosening Behavior of Bolted Joints under Eccentric Excitation[J]. Journal of Mechanical Engineering, 2018, 54(14): 74-81.

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