Abstract
In order to monitor the crack growth of the wood material better and reduce failure risks, this paper studied the attenuation characteristics of acoustic emission signals in wood through pencil lead breaking (PLB) tests, in the aim of estimating the true amplitude value of the acoustic emission source signal. The tensile test of the double cantilever beam (DCB) specimens was used to simulate the crack tip growth within wood material, monitoring acoustic activity and location of crack tips within wood material using acoustic emission technology and digital image correlation (DIC). Results showed that the attenuation degree of acoustic emission signals increased exponentially as the propagation distance increased, and the relationship between relative amplitude attenuation rate and the propagation distance of the acoustic emission signal was established by the regression method, which provides the input parameters for the establishment of the crack instability prediction model in the next step. Based on a thermodynamic approach, a theoretical model for predicting crack instability was established, and the model was verified by DCB tests. The model uses acoustic emission parameters as the basis for judging whether the crack is instable. It provides theoretical support for the application of acoustic emission technology in wood health monitoring.
Highlights
Under the environment of global warming and energy shortages, wood is widely used as a renewable material in civil engineering structures and other fields [1]
Diakhate et al [24] performed a double cantilever tensile test on wood specimens monitored with acoustic emission technology in the aim of understanding the characteristics of crack tip growth. These results indicated that acoustic emission events with peak frequencies less than 100 kHz and amplitudes greater than 50 dB are related to the growth of crack tips, and when the wood material reaches the limit of the stored stain energy, the first acoustic emission event occurs
The propagation characteristics of acoustic emission signals within Chinese fir and the energy conversion of a mode I fracture within Chinese fir were studied
Summary
Under the environment of global warming and energy shortages, wood is widely used as a renewable material in civil engineering structures and other fields [1]. The safety monitoring of wood during long-term use is very important. In this context, the acoustic emission method can provide an effective solution. As a nondestructive testing method, acoustic emission technology (AET) is characterized by its integrity, passive detection, and high sensitivity. It has applications in damage localization [2,3,4], signal processing [5,6,7], and damage recognition [8,9,10]. The literature published by Bucur et al [11] proposed that acoustic emissions could be used as an analytical tool for monitoring the nucleation and growth of cracks, because the crack nucleation and growth causes sudden changes of energy within a material
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