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Wood Science and Technology

, Volume 50, Issue 3, pp 489–501 | Cite as

Acoustic emission signals resulting from the drying-induced fractures of Phyllostachys pubescens bamboo: evidence of scale free phenomena

  • Gabriel VillalobosEmail author
Original

Abstract

Acoustic Emission (AE) is a noninvasive tool for evaluation of damage and fracture. In this paper, results of AE study of the drying process of Phyllostachys pubescens bamboo are reported. The histogram of experimental squared voltage distributions follows a power law with an exponent of \(-1.16\). The histogram of maximum amplitudes \(V_\mathrm{max}\) usually studied in the AE literature also shows a power law with a slope of \(-2.4\) (b-value of 2.4). This is reminiscent of scale free phenomena. Another novel aspect for bamboo literature is the calculation of the average signal shape for different time spans of the system. The shape has an asymmetrical shape for both long- and short-span signals, but shows a symmetrical shape for middle-span signals. This is an indication of a reinforcing feedback process, known in the statistical mechanics of fracture as an avalanche.

Keywords

Acoustic Emission Acoustic Emission Signal Acoustic Emission Event Voltage Distribution Acoustic Emission Technique 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Notes

Acknowledgments

This work was funded partly by the “Departamento Administrativo de Ciencia, Tecnología e Innovación de Colombia (COLCIENCIAS)” (Convocatoria Doctorados Nacionales 2008) and by the Computational Physics for Building Materials, from Prof. Hans Herrmann at the Institute for Building Materials, ETH-Zürich. I want to thank José Daniel Muñoz, who introduced me to the subject of bamboo drying and to Ferenc Kun, with whom I learned a lot about statistical mechanics of fracture. This work could not have been done without the help of Miller Mendoza, Julian Schrenk and Nuno Araujo, with whom I had enlightening conversations about the system and the measurement process. They also helped me to transport the bamboo samples from Frederic Eberts’ forest in Chiavari, Italy (http://www.bambus.de).

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Copyright information

© Springer-Verlag Berlin Heidelberg 2016

Authors and Affiliations

  1. 1.Universidad de Bogotá Jorge Tadeo LozanoBogotáColombia
  2. 2.Computational Physics for Engineering MaterialsIfB, ETH ZürichZurichSwitzerland

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