Acoustic Emission Activity Induced by Delamination and Fracture ofWood Structure

Bucur, V 2011, 'Acoustic Emission Activity Induced by Delamination and Fracture ofWood Structure' in Voichita Bucur (ed.) Delamination in Wood, Wood Products and Wood-Based Composites, Springer Science & Business Media, Dordrecht, The Netherlands, pp. 287-306.

Document type: Book Chapter
Collection: Book Chapters

Title Acoustic Emission Activity Induced by Delamination and Fracture ofWood Structure
Author(s) Bucur, V
Year 2011
Title of book Delamination in Wood, Wood Products and Wood-Based Composites
Publisher Springer Science & Business Media
Place of publication Dordrecht, The Netherlands
Editor(s) Voichita Bucur
Start page 287
End page 306
Subjects Materials Engineering not elsewhere classified
Acoustics and Acoustical Devices; Waves
Summary Delamination and fracture phenomena in wood can be monitored non-destructively, continuously and in real time with acoustic emission technique. The conventional classical parameters of acoustic emission are: hit, counting/ring-down count/emission count, amplitude, duration, rise time, energy, average frequency, initial frequency, reverberation frequency, frequency centroid, peak frequency, rise time divided by amplitude called RA value, RMS (root mean squared values), the threshold voltage (ISO 12716). The approaches in analysing AE signals are: parameter-based techniques and signal-based quantitative techniques. The parameter-based techniques are the most popular for wood material studies. Acoustic emission technique operates using resonant or wideband transducers in ultrasonic frequency range (100 kHz-1 MHz). The most appropriated technique for wood is with piezoelectric transducers between 100 and 200 kHz. Acoustic emission is highly sensitive to the initiation and growth of delamination in wood and has advantages over conventional ultrasonic and radiographic methods. Transverse failure is one of the most important damage mechanisms controlling the loss of stiffness in wood which may be lifetime limiting in for structural members. Factors such as species, grain angle orientation, annual ring structure, moisture content, tension wood, etc effects the acoustic emission activity related to crack propagation, delamination and fracture phenomena. Acoustic emission technique provides a sensitive approach for real time detection of cracking, and also an unique view into the micromechanics of crack initiation and growth of delamination. The damage processes in the material under test can be observed during the entire load history without any deterioration of the specimen.
Copyright notice © Springer Science+Business Media B.V. 2011
DOI - identifier 10.1007/978-90-481-9550-3_15
ISBN 9789048195503
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