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Improving the usability of piezoresistive bond lines in wood by using impedance measurements

  • Various studies on wood adhesives filled with conductive fillers for future application to structural monitoring showed a piezoresistive (resistance change with strain) response of the adhesive bond lines that is measurable under direct current. The results also showed a relatively high signal noise with low sensitivity. Using impedance spectroscopy as a measurement technique, the improvements in frequency-dependent piezoresistivity over DC (Direct Current) resistography of multifunctional bonded wood were studied. Beech specimens were bonded by one-component polyurethane prepolymer (1C-PUR) filled with carbon black and tested under shear load. The quality of the piezoresistive properties was described by calculating the signal-to-noise ratio (SNR) of the measured signal. A setup-specific frequency band with optimized SNR between 100 kHz and 1 MHz could be derived from the measurements. Several frequencies showed a signal with higher quality resulting in a higher SNR. Regardless of the variations in impedance spectra for allVarious studies on wood adhesives filled with conductive fillers for future application to structural monitoring showed a piezoresistive (resistance change with strain) response of the adhesive bond lines that is measurable under direct current. The results also showed a relatively high signal noise with low sensitivity. Using impedance spectroscopy as a measurement technique, the improvements in frequency-dependent piezoresistivity over DC (Direct Current) resistography of multifunctional bonded wood were studied. Beech specimens were bonded by one-component polyurethane prepolymer (1C-PUR) filled with carbon black and tested under shear load. The quality of the piezoresistive properties was described by calculating the signal-to-noise ratio (SNR) of the measured signal. A setup-specific frequency band with optimized SNR between 100 kHz and 1 MHz could be derived from the measurements. Several frequencies showed a signal with higher quality resulting in a higher SNR. Regardless of the variations in impedance spectra for all specimens, this frequency band provided several frequencies with improved signal quality. These frequencies give a more reliable signal with lower noise compared to the signal from DC resistography.show moreshow less
Metadaten
Author:Jesco SchäferORCiD, Christopher Jager, Ulrich Schwarz, Christoph WinklerORCiD
URN:urn:nbn:de:kobv:eb1-opus-1942
DOI:https://doi.org/10.1007/s00226-021-01311-8
ISSN:0043-7719
Parent Title (English):Wood Science and Technology
Publisher:Springer Nature
Document Type:Article
Language:English
Year of Completion:2021
Date of Publication (online):2021/09/10
Date of first Publication:2021/06/19
Publishing Institution:Hochschule für nachhaltige Entwicklung Eberswalde
Release Date:2021/09/10
Volume:55
Issue:4
Page Number:18
First Page:937
Last Page:954
Institutions / Departments:Fachbereich Holzingenieurwesen
Dewey Decimal Classification:6 Technik, Medizin, angewandte Wissenschaften / 62 Ingenieurwissenschaften
open_access (DINI-Set):open_access
Funding by the HNEE:Projekt DEAL
University Bibliography:University Bibliography
Zweitveröffentlichung
Peer-Review / Referiert
Licence (German):License LogoCreative Commons - CC BY - Namensnennung 4.0 International
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