Variation of stress wave velocity, wood density and static bending strength of 22-year-old planted Tectona grandis trees in northwest Vietnam

Van Duong, D. and Kanninen, M. (2024) Variation of stress wave velocity, wood density and static bending strength of 22-year-old planted Tectona grandis trees in northwest Vietnam. Journal of Tropical Forest Science (JTFS) (Malaysia), 36 (4). pp. 416-423. ISSN 0128-1283

We studied stress wave velocity and wood properties at different radial and axial levels of 22-year-old planted Tectona grandis trees growing in Northwest Vietnam. We measured stress wave velocity of logs (SWV˪) and small clear specimens (SWVₛ) obtained from the logs. In addition, we measured air-dry density (AD), modulus of rupture (MOR), and modulus of elasticity (MOE) at 12% moisture content. Within tree, radial position was not a source of variation of stress wave and wood properties, except for MOR. In contrast, the longitudinal variation was highly significant and the most important of variation in SWVₛ and MOE. There was statistically significant (0.1% level) but weak correlation (r = 0.36) between AD and MOE, while strong correlation was found between AD and MOR (r = 0.67). The increase of SWV˪ and SWVₛ may result in significant increase in dynamic modulus elasticity of log (E˪) and MOE, respectively. These results suggest that the stress wave technique could be applied for grading or segregation of the stiffness of timber in teak.

Full text available from: Official URL: https://jtfs.frim.gov.my/jtfs/article/view/2965/19...

Abstract

We studied stress wave velocity and wood properties at different radial and axial levels of 22-year-old planted Tectona grandis trees growing in Northwest Vietnam. We measured stress wave velocity of logs (SWV˪) and small clear specimens (SWVₛ) obtained from the logs. In addition, we measured air-dry density (AD), modulus of rupture (MOR), and modulus of elasticity (MOE) at 12% moisture content. Within tree, radial position was not a source of variation of stress wave and wood properties, except for MOR. In contrast, the longitudinal variation was highly significant and the most important of variation in SWVₛ and MOE. There was statistically significant (0.1% level) but weak correlation (r = 0.36) between AD and MOE, while strong correlation was found between AD and MOR (r = 0.67). The increase of SWV˪ and SWVₛ may result in significant increase in dynamic modulus elasticity of log (E˪) and MOE, respectively. These results suggest that the stress wave technique could be applied for grading or segregation of the stiffness of timber in teak.

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Item Type:	Article
AGROVOC Term:	Tectona grandis
AGROVOC Term:	wood
AGROVOC Term:	logs
AGROVOC Term:	type specimens
AGROVOC Term:	measurement
AGROVOC Term:	testing
AGROVOC Term:	wood density
AGROVOC Term:	modulus of elasticity
AGROVOC Term:	moisture content
AGROVOC Term:	clonal variation
Geographical Term:	Vietnam
Uncontrolled Keywords:	MOE, MOR, stress wave velocity, Tectona grandis, wood density
Depositing User:	Ms. Azariah Hashim
Date Deposited:	16 Jun 2026 01:28
Last Modified:	16 Jun 2026 01:28
URI:	http://webagris.upm.edu.my/id/eprint/3749

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