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Proceedings Paper

Piezoelectric sensor for in situ measurement of stress intensity factors
Author(s): D. Bäcker; C. Häusler; M. Kuna
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Paper 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 KI - factor as well as the position of the crack tip could be determined with sufficient accuracy but not the KII- 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.

Paper Details

Date Published: 14 April 2011
PDF: 10 pages
Proc. SPIE 7981, Sensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems 2011, 79812T (14 April 2011); doi: 10.1117/12.881094
Show Author Affiliations
D. Bäcker, Technische Univ. Bergakademie Freiberg (Germany)
C. Häusler, Technische Univ. Bergakademie Freiberg (Germany)
M. Kuna, Technische Univ. Bergakademie Freiberg (Germany)


Published in SPIE Proceedings Vol. 7981:
Sensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems 2011
Masayoshi Tomizuka, Editor(s)

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