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- W2185512777 abstract "Cavitation events in water-conducting elements of wood and dehydration cracks caused by wood-shrinkage processes induce acoustic emissions (AEs) in the high-frequency range. The aim of this study was to relate spectral features of AEs from dehydrating Norway spruce (Picea abies (L.) Karst.) trunkwood to shrinkage processes. Wood shrinkage in the radial direction was assessed by load cells. Resonant 150 kHz, 60 kHz and broadband transducers (operating range 50200 kHz, 35-100 kHz and 100-1000 kHz, respectively) were used to detect AEs at the same time on standard size samples (5 or 10 cm (length) x 6 mm (radial) x 6 mm (tangential)). Two different shrinkage processes were detected, where the first shrinkage period was termed “tension shrinkage”. Shrinkage caused by high tensions is a phenomenon observed also in field measurements and is practically used for drought stress measurements of living trees. The final shrinkage process started at relative water contents around the “fiber saturation point”, where most of the cell lumina contain no water, but walls are fully saturated with liquid. The onset of the rapid rise in tension shrinkage coincided with the decrease of the first rapid rise of the total AE rate (r = 0.99). The valley between the last two AE peaks was located at the onset of the final shrinkage process. Characteristics for AEs during the tension shrinkage period were higher proportions of AEs with very high amplitudes (> 60 dB) and lower frequency components. Therefore, the highest relative AE energies (pVs) were measured during this stage. AEs during the final shrinkage period showed lower amplitudes, lower energy values and higher frequency components." @default.
- W2185512777 created "2016-06-24" @default.
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- W2185512777 date "2007-01-01" @default.
- W2185512777 modified "2023-09-27" @default.
- W2185512777 title "CHARACTERISTICS OFACOUSTIC EMISSIONS FROM DEHYDRAT- ING WOOD RELATED TO SHRINKAGE PROCESSES" @default.
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