Mode I fracture and acoustic emission of softwood and hardwood |
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Authors: | A Reiterer S E Stanzl-Tschegg E K Tschegg |
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Institution: | Institut für Meteorologie und Physik der Universit?t für Bodenkultur, Wien und Christian-Doppler-Laboratorium für Grundlagen der Holzbearbeitung, Türkenschanzstra?e 18, 1180 Wien, Institut für Angewandte und Technische Physik der Technischen Universit?t Wien, Karlsplatz 13, 1040 Wien,
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Abstract: | The Mode I fracture behaviour of two softwoods (spruce and pine) and three hardwoods (alder, oak and ash) was studied in
the RL crack propagation system using the splitting test in combination with monitoring acoustic emission (AE) activity. Test
parameters measured included notch tensile strength, specific fracture energy, characteristic length and AE cumulative counts,
AE amplitudes as well as parameters characterizing the frequency spectra of the emitted acoustic emission events. The notch
tensile strength was found to correlate with density. The specific fracture energy and characteristic length showed the different
crack propagation process between the softwoods and hardwoods. The softwoods fractured in a more ductile way and the hardwoods
showed a more linear elastic behaviour. This finding was supported by the AE measurements showing much less cumulative counts
for the hardwoods indicating that less microcracks were formed and that processes like fiber bridging were not so effective.
Differences in the frequency domain of the AE signals between softwoods and hardwoods could not be detected.
Received 13 January 1999 |
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