Qr code

Associate Professor
Supervisor of Doctorate Candidates
Supervisor of Master's Candidates

Alma Mater:The Hong Kong Polytechnic University
Degree:Doctoral Degree
School/Department:Dalian University of Technology,China
Discipline:Computational Mechanics. Aerospace Mechanics and Engineering. Flight Vehicle Design. Materials Physics and Chemistry. Polymer Materials
Business Address:411A, No.1 integrated experimental building, Dalian University of Technology, China
Contact Information:xuhao@dlut.edu.cn
Click: times

Open time:..

The Last Update Time:..

Current position: Home >> Scientific Research >> Paper Publications

Vibro-acoustic modulation (VAM)-inspired structural integrity monitoring and its applications to bolted composite joints

Hits : Praise

Indexed by:期刊论文

Date of Publication:2017-09-15


Included Journals:SCIE、EI、Scopus


Page Number:505-515

ISSN No.:0263-8223

Key Words:Composite bolted joint; Bolt loosening; Vibro-acoustic modulation; Contact acoustic nonlinearity; Structural health monitoring

Abstract:Vibro-acoustic modulation (VAM) - one of the prevailing nonlinear methods for material characterization and structural damage evaluation - is based on the effect of modulation of a low-frequency vibration (pumping vibration) on a high-frequency acoustic wave (probing wave). In this study, the contact acoustic nonlinearity (CAN), associated with changes in the solid-solid interface of a bolted joint under VAM, due to bolt loosening, is explored analytically and experimentally, on which basis a VAM-inspired approach is developed for monitoring structural integrity of bolted joints. Numerical simulation based on a theoretical model with structural nonlinear contact stiffness is implemented, to achieve insight into CAN induced by a loose bolt. A quantitative correlation between vibro-acoustic nonlinear distortion and degree of bolt loosening is ascertained. The developed approach is applied to detect bolt loosening in a composite bolted joint and to evaluate the residual torque of the loose bolt quantitatively. Take a step further, the VAM-based nonlinear approach is compared against an elastic wave-based linear method, underscoring a higher sensitivity to bolt loosening. From early awareness of bolt loosening to continuous evaluation of the bolt loosening progress, this VAM-based approach has provided a cost-effective framework for monitoring the health and integrity of a composite bolted joint. (C) 2017 Elsevier Ltd. All rights reserved.