Acoustic emission signals resulting from the drying induced fractures of Phyllostachys Pubescens bamboo, Evidence of scale free phenomena

TL;DR

This study investigates acoustic emission signals during bamboo drying, revealing scale-free phenomena and crack dynamics, with experimental evidence showing power-law distributions and asymmetrical signal shapes.

Contribution

It provides the first experimental evidence of scale-free behavior in drying-induced fractures of bamboo through acoustic emission analysis.

Findings

Squared voltage distributions follow a power law with exponent -1.16

Average signal shape is asymmetrical across different time spans

Evidence of an initial large crack at the start of drying process

Abstract

I have performed experimental measurements of acoustic emission signals resulting from the drying process of Phyllostachys Pubescens bamboo. The emphasis was on identifying individual events, and characterize them according to their time span and energy release. My results show a histogram of experimental squared voltage distributions nicely fit into a power law with exponent of $-1.16$, reminiscent of scale free phenomena. I have also calculated the average signal shape, for different time spans of the system, and found an asymmetrical form. The experimental evidence points to the system having an isolated large crack at the beginning of the simulation.