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Proceedings Article

Piezoelectric sensor for in situ measurement of stress intensity factors

[+] Author Affiliations
D. Bäcker, C. Häusler, M. Kuna

Technische Univ. Bergakademie Freiberg (Germany)

Proc. SPIE 7981, Sensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems 2011, 79812T (April 14, 2011); doi:10.1117/12.881094
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From Conference Volume 7981

  • Sensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems 2011
  • Masayoshi Tomizuka
  • San Diego, California, USA | March 06, 2011

abstract

A method for monitoring fatigue cracks in thin-walled shell-structures using piezoelectric polyvinylidene fluoride (PVDF) films is presented. By means of a spatially resolved measurement, it allows the simultaneously localization of the crack tip and determination of the K - factors by solving the resulting inverse problem. In previous publications [1], [2] only the K I - factor as well as the position of the crack tip could be determined with sufficient accuracy but not the K II- factor. Therefore, the concept will be tested and verified using the example of a crack in an infinite plate. From that we deduce some recommendations for the electrode placement and the solution of the inverse problem. In addition, a first experiment of a cracked aluminum specimen is reported.

© (2011) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Citation

D. Bäcker ; C. Häusler and M. Kuna
"Piezoelectric sensor for in situ measurement of stress intensity factors", Proc. SPIE 7981, Sensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems 2011, 79812T (April 14, 2011); doi:10.1117/12.881094; http://dx.doi.org/10.1117/12.881094


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