Piezoelectric sensor for in-situ measurement of stress intensity factors

被引：3
|
作者：
Baecker, D. [1 ]
Haeusler, C. [1 ]
Kuna, M. [1 ]
机构：
[1] Tech Univ Bergakad Freiberg, D-09596 Freiberg, Germany
来源：
SENSORS AND SMART STRUCTURES TECHNOLOGIES FOR CIVIL, MECHANICAL, AND AEROSPACE SYSTEMS 2011 | 2011年 / 7981卷
关键词：
fatigue crack growth; fracture mechanical sensor; K - factor sensor; structural health monitoring; PVDF; PVDF-FILMS; CRACKS;
D O I：
10.1117/12.881094
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
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 - factors 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.
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页数：10
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