Elastic wave propagation in thick-walled hollow cylinders for damage localization through inner surface sensing

Yuanman Zhang; Shengbo Shan; Li Cheng

doi:10.1016/j.ultras.2023.107027

Elastic wave propagation in thick-walled hollow cylinders for damage localization through inner surface sensing

Ultrasonics. 2023 Aug:133:107027. doi: 10.1016/j.ultras.2023.107027. Epub 2023 Apr 29.

Authors

Yuanman Zhang¹, Shengbo Shan², Li Cheng³

Affiliations

¹ Department of Mechanical Engineering, The Hong Kong Polytechnic University, Kowloon, Hong Kong; The Hong Kong Polytechnic University Shenzhen Research Institute, Shenzhen 518057, China; Hong Kong Branch of National Rail Transit Electrification and Automation Engineering,Technology Research Center, The Hong Kong Polytechnic University, Kowloon, Hong Kong.
² School of Aerospace Engineering and Applied Mechanics, Tongji University, Shanghai 200092, China. Electronic address: shanshengbo@tongji.edu.cn.
³ Department of Mechanical Engineering, The Hong Kong Polytechnic University, Kowloon, Hong Kong; The Hong Kong Polytechnic University Shenzhen Research Institute, Shenzhen 518057, China; Hong Kong Branch of National Rail Transit Electrification and Automation Engineering,Technology Research Center, The Hong Kong Polytechnic University, Kowloon, Hong Kong. Electronic address: li.cheng@polyu.edu.hk.

PMID: 37150121
DOI: 10.1016/j.ultras.2023.107027

Abstract

Thick-walled hollow cylinders (TWHCs) are widely used in engineering structures and transportation systems, exemplified by train axles. The real-time and online health monitoring of such structures is crucial to ensure their structural integrity and operational safety. While elastic-wave-based structural health monitoring (SHM) shows promise, the development of feasible methods strongly relies on a good understanding and exploitation of the wave propagation properties and their interaction with structural defects. TWHCs usually bear multiple wave modes, which is a less investigated and explored topic as compared with thin-walled structures. This work examines this issue and proposes a dedicated damage localization strategy by using the selected waves captured on the inner surface of a TWHC. It is shown that, alongside the quasi-surface-waves on the outer surface, longitudinal waves converted from the thickness-through shear bulk waves are generated to propagate along the inner surface. Their propagation characteristics are exploited for damage localization based on hyperbolic loci methods through inner surface sensing. Numerical studies are conducted to validate the method and assess different transducer configurations, alongside experimental verifications on a benchmark TWHC containing a notch-type defect. Studies provide guidance on damage detection in TWHCs and sensor network design.

Keywords: Damage localization; Mode conversion; Quasi-surface-wave; Thick-walled hollow cylinder.