A strain amplitude-based algorithm for impact localization on composite laminates

Cristobal Hiche, Clyde K. Coelho, Aditi Chattopadhyay

Research output: Contribution to journalArticlepeer-review

34 Scopus citations


Automated detection of damage due to low energy impacts in composite structures is very important for aerospace structural health monitoring applications. Low-velocity impact creates subsurface damage that can significantly reduce the stiffness of a component, yet show barely visible damage. This article proposes a novel methodology for impact localization based on the maximum strain amplitude measured by fiber Bragg grating (FBG) sensors during an impact event. The approach correlates the strain amplitude of each sensor pair to find the location of highest strain corresponding to the impact location. This approach requires minimal knowledge of the structure and fewer number of sensors as opposed to current localization methods. Both simulation and experimental data are used as proof of concept. Since FBG sensors measure strain in only one direction, the effect of sensor orientation on the performance of the algorithm is also studied. The algorithm is tested on graphite/epoxy composite plates and shows good localization results in all impact cases considered.

Original languageEnglish (US)
Pages (from-to)2061-2067
Number of pages7
JournalJournal of Intelligent Material Systems and Structures
Issue number17
StatePublished - Nov 2011


  • fiber Bragg gratings
  • impact localization
  • strain amplitude
  • woven composites

ASJC Scopus subject areas

  • General Materials Science
  • Mechanical Engineering


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