Publication: Penggunaan ujian tanpa musnah ke atas struktur kayu
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Date
2004-03-01
Authors
Tan, Poh Soon
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Abstract
The Non-Destructive Testing (NDT) methods such as rebound hammer and ultrasonic pulse velocity technique are used to study the suitability of these NDT
methods to assess the structural integrity of timber elements. Two types of timber with different strength were selected from Table 3: Strength groups of timber in MS 544: Part 2: 2001, “Code of Practice for Structural Use of Timber: Part 2: Permissible Stress Design of Solid Timber”, Malaysian Standard to be assessed. Five samples from each type of timber were prepared to obtain the mean value of each test and to differentiate between both tests. Moisture content in each sample of timber was measured throughout both tests which been carried out. Rebound number across the grain is bigger than rebound number along the grain for both types of timber. The value of rebound number increased with the increasing of the strength of tested timber. Ultrasonic pulse velocity along the grain is faster than ultrasonic pulse velocity across the grain for both types of timber. Ultrasonic pulse velocity also increased with the increasing of the strength of tested timber. Ultrasonic pulse velocity along the grain gave a good correlation with compression strength parallel to grain for both types of timber. Rebound Number across the grain gave a good correlation with compression strength parallel to grain. The combination of detail information from rebound hammer
and ultrasonic pulse velocity is required to predict the compression strength parallel to grain of timber.