Journal of Wood Science

, Volume 64, Issue 4, pp 329–337 | Cite as

Within-stem variations in mechanical properties of Melia azedarach planted in northern Vietnam

  • Doan Van Duong
  • Junji MatsumuraEmail author
Original Article


Within-stem variations in the mechanical properties of 17–19-year-old Melia azedarach planted in two sites in northern Vietnam were examined by destructive and nondestructive methods. Wood samples were collected from 10, 50, and 90% of the radial length from pith on both sides (North and South) at 0.3, 1.3, 3.3, 5.3, and 7.3 m heights above the ground. The mean values in whole trees of wood density (WD), modulus of rupture (MOR), modulus of elasticity (MOE), and dynamic modulus of elasticity (Ed) at 12% moisture content were 0.51 g/cm3, 78.58 MPa, 9.26 GPa, and 10.93 GPa, respectively. Within the stem, the radial position was a highly (p < 0.001) significant source of variation in mechanical properties. MOR, MOE, and Ed increased from pith to bark. WD had a strong positive linear relationship with both MOR (r = 0.85, p < 0.001) and MOE (r = 0.73, p < 0.001). This suggests that it is potentially possible to improve mechanical properties through controlling WD. MOR had also a strong linear relationship with Ed (r = 0.84, p < 0.001). This indicates that Ed is a good indicator to predicting the strength of wood if the density of measured element is known. Besides, the stress wave method used in this study provides relatively accurate information for determining the stiffness of Melia azedarach planted in northern Vietnam.


Melia azedarach Mechanical properties Nondestructive evaluation Radial position 



The first author was funded by Vietnam government for a Doctor course at Graduate School of Bioresource and Bioenvironmental Sciences, Kyushu University, Fukuoka, Japan.

Compliance with ethical standards

Conflict of interest

The authors declare no conflict of interest.


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Copyright information

© The Japan Wood Research Society 2018

Authors and Affiliations

  1. 1.Faculty of Agriculture, Graduate School of Bioresource and Bioenvironmental SciencesKyushu UniversityFukuokaJapan
  2. 2.Faculty of ForestryThai Nguyen University of Agriculture and ForestryThai NguyenVietnam
  3. 3.Laboratory of Wood Science, Faculty of AgricultureKyushu UniversityFukuokaJapan

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