Internal decay assessment in standing beech trees using ultrasonic velocity measurement |
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Authors: | Saeed Kazemi-Najafi Ali Shalbafan Ghanbar Ebrahimi |
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Affiliation: | (1) Wood and Paper Science and Technology Department, Natural Resources and Marine Sciences Faculty, Tarbiat Modares University, Noor, Iran;(2) Wood and Paper Science and Technology Department, Faculty of Natural Resources, Tehran University, Karaj, Iran |
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Abstract: | Ultrasonic wave timing inspection was used to detect the internal decay in standing Iranian beech trees (Fagus orientalis). To evaluate the influence of internal decay on ultrasonic velocity, healthy round sections of freshly cut fallen beech trees were selected. Holes [as heart or internal decay indicator and with different shapes (circular and slot) and locations] were manually created and progressively enlarged in the wood section disks, and ultrasonic wave velocity was measured by using a commercial ultrasonic tester (Sylvatest Duo). The results showed that ultrasonic wave velocity linearly and significantly decreased by increasing hole dimensions, and location of holes had no influence on the extent and trend of velocity decrease. Although slots covered a small volume fraction of disks, they had a greater effect on ultrasonic velocities reduction as compared with circular holes. |
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Keywords: | Nondestructive testing Standing trees Beech Internal decay Ultrasonic velocity |
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