Monitoring of surface-fatigue crack propagation in a welded steel angle structure using guided waves and principal component analysis

Mingyu Lu, Yongwei Qu, Ye Lu, Lin Ye, Li Min Zhou, Zhongqing Su

Research output: Chapter in book / Conference proceedingConference article published in proceeding or bookAcademic researchpeer-review

2 Citations (Scopus)

Abstract

An experimental study is reported in this paper demonstrating monitoring of surface-fatigue crack propagation in a welded steel angle structure using Lamb waves generated by an active piezoceramic transducer (PZT) network which was freely surface-mounted for each PZT transducer to serve as either actuator or sensor. The fatigue crack was initiated and propagated in welding zone of a steel angle structure by three-point bending fatigue tests. Instead of directly comparing changes between a series of specific signal segments such as S0 and A0 wave modes scattered from fatigue crack tips, a variety of signal statistical parameters representing five different structural status obtained from marginal spectrum in Hilbert-huang transform (HHT), indicating energy progressive distribution along time period in the frequency domain including all wave modes of one wave signal were employed to classify and distinguish different structural conditions due to fatigue crack initiation and propagation with the combination of using principal component analysis (PCA). Results show that PCA based on marginal spectrum is effective and sensitive for monitoring the growth of fatigue crack although the received signals are extremely complicated due to wave scattered from weld, multi-boundaries, notch and fatigue crack. More importantly, this method indicates good potential for identification of integrity status of complicated structures which cause uncertain wave patterns and ambiguous sensor network arrangement.
Original languageEnglish
Title of host publicationThird International Conference on Smart Materials and Nanotechnology in Engineering
Volume8409
DOIs
Publication statusPublished - 1 Dec 2012
Event3rd International Conference on Smart Materials and Nanotechnology in Engineering - Shenzhen, China
Duration: 5 Dec 20118 Dec 2011

Conference

Conference3rd International Conference on Smart Materials and Nanotechnology in Engineering
Country/TerritoryChina
CityShenzhen
Period5/12/118/12/11

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering

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