Penggunaan Kaedah Dinamik Ultrasonik bagi Menentukan Pemalar Kenyal Kayu Tropika
This paper reports the determination of elastic constants for 56 tropical wood species using the dynamic ultrasonic technique. Longitudinal waves (45 kHz) were used to measure the velocity in the radial (R), tangential (T) and longitudinal (L) anisotropic directions of each sample of wood. The di...
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| Main Authors: | , , |
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| Format: | Article |
| Language: | English Malay |
| Published: |
Universiti Putra Malaysia Press
1995
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| Online Access: | http://psasir.upm.edu.my/id/eprint/3836/1/Penggunaan_Kaedah_Dinamik_Ultrasonik_bagi.pdf http://psasir.upm.edu.my/id/eprint/3836/ |
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| Summary: | This paper reports the determination of elastic constants for 56 tropical wood
species using the dynamic ultrasonic technique. Longitudinal waves (45 kHz)
were used to measure the velocity in the radial (R), tangential (T) and
longitudinal (L) anisotropic directions of each sample of wood. The diagonal
elastic constants of each species of wood studied were estimated using the
values of ultrasonic wave velocities and their mean densities via the Christoffel
equations. The results show that there is a linear correlation between the elastic
constants in the L, Rand T directions and density of wood. Comparison
between the ultrasonic measurement and static measurement indicate that the
ultrasonic measurement technique is also capable of assessing the quality of
tropical medium and heavy hardwood. |
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