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ACOUSTIC EMISSION SIGNAL RESPONSE OF PIEZOELECTRIC FIBER COMPOSITES

ACOUSTIC EMISSION SIGNAL RESPONSE OF PIEZOELECTRIC FIBER COM...

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2015全国压电和声波理论及器件技术研讨会

作者： Fan LU Xiu-juan Lin Bo GENG Yang LI Shi-feng HUANG Shandong Provincial Key Lab.of Preparation and Measurement of Building Materials University of Jinan Department of Qualify Assurance Faw Jiefang Qingdao Automobile Co.Ltd.

Piezoelectric fiber composites（PFCs）were fabricated by cutting-filling methods to be used as acoustic emission（AE）sensors.The AE sources were simulated by pencil lead broken,the AE signals were collected in the test plate and the linear localization of sound source was measured based on acoustic emission technology.The results showed that the obtained AE signal amplitudes and voltages of PFCs exhibited dependence on the measuring distances and angles.The AE signal amplitudes were different in the orthogonal direction which indicated that the PFCs exhibited well orthotropic property.The attenuation curves showed that the trend of signal attenuation gradually slowed down as the distance increased.The lead broken signals were acquired by the sensors for each time and the accuracy of linear positioning was above a percentage of 95,which indicated that the PFCs possessed good sensitivity and good signal responses to achieve the purpose of positioning and had high accuracy in the process of linear localization.

关键词： Piezoelectric fiber Acoustic emission orthotropic property Signal response Linear localization

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STUDY ON THE 1-3 orthotropic POLMER/CEMENTBASED PIEZOELECTRIC COMPOSITE

STUDY ON THE 1-3 ORTHOTROPIC POLMER/CEMENTBASED PIEZOELECTRI...

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2016年全国压电和声波理论及器件应用研讨会

作者： Su-hui ZHAI Yong-chen WANG Bo GENG Hong-chao XU Shi-feng HUANG Shandong provincial Key Lab.of Preparation and Measurement of Building Materials University of Jinan

Background, Motivation and Objective Cement-based piezoelectric composites as sensing elements has been drawing broad attention in health monitoring of civil engineering for its unique advantages, while the traditional piezoelectric element cannot effectively detect the stress wave from different directions for its transverse isotropy. The 1-3orthotropic polymer/cement based piezoelectric composite(OPCM) demonstrate high sensitivity and sensing property, additionally, the 1-3 OPCM can identify the tress wave from different directions due to its special interdigitated electrode structure, which make it possible to predicate and positioning the crack and damage in concrete structure. Statement of Contribution/Methods The OPCM was fabricated using PZT-51 as functional part and epoxy resin/cement as matrix via twice cutting-filling methods. The OPCM was reversibly fixed on the surface of concrete block by vaseline as coupling agent. The acoustic emission signal was collected by pencil lead-break as signal source on the concrete surface and the linear location test of signal source was carried by Acoustic emission(AE) technique. The relationship between distance and amplitude could be got from attenuation curve so that OPCM can realize the accurate positioning of concrete crack and damage. Results The signal amplitudes and voltages generated by pencil lead-break of the OPCM on the surface of concrete block were obtained. As shown in the figures, the signal amplitudes and voltages both varied slightly from distance and angle. The amplitude and voltage have maximum values at the direction of 0°and 180°, the minimum values were at 90°and 270°, the AE signal curve tended to be a cosine shape. The attenuation curve was acquired as the increasing distance between OPCM and pencil lead-break signal source, besides, the signal amplitudes and voltages decreased exponentially with distance increase. The linear location test was carried out on the concrete surface with the OPCMs at fixed position, in which the pencil lead-break s

关键词： Cement-based piezoelectric composite orthotropic property Acoustic emission Linear location

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