Analysis on Microstructure and Mechanical Properties of Birch Laminated Veneer Lumber

Abstract:

In this paper, four different nondestructive testing (NDT) methods and the static bending test were conducted on the birch (Betula platyphylla Suk.) laminated veneer lumber (LVL). The NDT methods included the longitudinal transmission method, longitudinal vibration method, in-plane and out-plane flexural vibration method. The effects of the compression ratio on the static bending (MOE) and bending strength (MOR) of LVL with vertical load were investigated. There were four compression ratios for different ply numbers of LVL, 8.1% for eight-ply samples, 18.3% for nine-ply samples, 26.5% for ten-ply samples, 33.1% for eleven-ply samples, respectively. The microscopic structure of the LVL was analyzed with a scanning electron microscope (SEM). The results showed that the MOE and MOR of LVL were increased with increasing compression ratio, and there was a strong correlation between each dynamic Young’s modulus and the static MOE.

• Periodical: Advanced Materials Research (Volumes 113-116)
• Pages: 2035-2038
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.113-116.2035
• Online since: June 2010
• Authors: Bing Xue, Ying Cheng Hu
• Keywords: Compression Ratio, Laminated Veneer Lumber (LVL), Mechanical Property, Microstructure

References

[1] S. Çolak, G. Çolakoğlu, I. Aydin: Building and Environment. Vol. 42(2007), p.93.

[2] T. Llaufenberg: Forest Products Journal. Vol. 32 (1982), p.42.

[3] A. Özçifçi: Forest Products Journal. Vol. 42 (2007), p.1510.

[4] Y.C. Hu, T. Nakao, T. Nakai, J.Y. Gu and F.H. Wang: J. Wood Sci. Vol. 51(2005), p.7.

[5] Y.C. Hu, F.H. Wang, J.Y. Gu, Y.X. Liu and T. Nakao: Wood Sci. Tech. Vol. 39 (2005), p.439.

[6] Y.C. Hu, T. Nakao, T. Nakai, J.Y. Gu and F.H. Wang: J. Wood Sci. Vol. 51 (2005), p.13.

[7] Y.X. Liu: Wood-based Resource and Materials (China Forestry Press, Beijing 2004).

[8] M.H. Guo: J. Forest. Res. Vol. 17 (2006), p.157.