In-situ acousto-ultrasonic monitoring of crack propagation in Al2024 alloy

Prashanth A. Vanniamparambil, Ivan Bartoli, Kavan Hazeli, Jefferson Cuadra, Eric Schwartz, Raghavendra Saralaya, Antonios Kontsos

Research output: Chapter in Book/Report/Conference proceedingConference contribution

4 Scopus citations


A data fusion technique implementing the principles of acoustic emission (AE), ultrasonic testing (UT) and digital image correlation (DIC) was employed to in situ monitor crack propagation in an Al 2024 alloy compact tension (CT) specimen. The specimen was designed according to ASTM E647-08 and was pre-cracked under fatigue loading to ensure stable crack growth. Tensile (Mode I) loads were applied according to ASTM E1290-08 while simultaneously recording AE activity, transmitting ultrasonic pulses and measuring full-field surface strains. Realtime 2D source location AE algorithms and visualization provided by the DIC system allowed the full quantification of the crack growth and the cross-validation of the recorded non-destructive testing data. In post mortem, waveform features sensitive to crack propagation were extracted and visible trends as a function of computed crack length were observed. In addition, following a data fusion approach, features from the three independent monitoring systems were combined to define damage sensitive correlations. Furthermore a novelty detector based on the Mahalanobis outlier analysis was implemented to quantify the extent of crack growth and to define a more robust sensing basis for the proposed system.

Original languageEnglish (US)
Title of host publicationHealth Monitoring of Structural and Biological Systems 2012
StatePublished - 2012
Externally publishedYes
EventHealth Monitoring of Structural and Biological Systems 2012 - San Diego, CA, United States
Duration: Mar 12 2012Mar 15 2012

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
ISSN (Print)0277-786X


OtherHealth Monitoring of Structural and Biological Systems 2012
Country/TerritoryUnited States
CitySan Diego, CA


  • Acoustic emission
  • Crack monitoring
  • Data fusion
  • Digital image correlation
  • Guided ultrasonic waves
  • Novelty detector
  • Structural health monitoring

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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