A fretting test apparatus for measuring friction hysteresis of bolted joints. (November 2020)

• Record Type: Journal Article
• Authors: Li, Dongwu; Xu, Chao; Botto, Daniele; Zhang, Zhishu; Gola, Muzio
• Is Part Of: Tribology international. Volume 151(2020)
• Publication Date: 2020-11
• Subjects: Fretting tests -- Bolted joints -- Friction hysteresis -- Contact stiffness; Tribology -- Periodicals; 621.89
• DOI: 10.1016/j.triboint.2020.106431
• Languages: English
• ISSNs: 0301-679X

Abstract

Abstract: This paper focuses on an experimental investigation of the mechanical behavior of bolted joints. A new test apparatus to measure friction hysteresis was designed to provide a reliable experimental database for the calibration of contact models. This apparatus uses a piezoelectric actuator to provide the contact interfaces with stable oscillatory relative displacement. The friction force and the bolt preload were continuously measured during the test, using a load cell and a force washer, respectively. The relative motion between the interfaces was measured using a single laser vibrometer. The influence of the bolt preload and excitation amplitude on friction hysteresis was investigated. A numerical model was developed to extract the tangential contact stiffness from the measured data. Graphical abstract: Image 1 Highlights: A fretting test apparatus is developed for studying friction hysteresis of bolted joints. The tangential contact force and the relative displacement are measured using a load cell and a laser vibrometer with a prism, respectively. The bolt preload is recorded using a force washer. A numerical analysis is conducted to evaluate the accuracy of the measurement.