Mechanical Properties of Compressed Wood with Various Compression Ratios

Buan Anshari, Akihisa Kitamori, Kiho Jung, Kohei Komatsu, Zhongwei Guan

Abstract


This paper investigates five groups of compressed wood (CF), four of them made from compressed Japanese cedar with four different compression ratios (CR) of 33%, 50%, 67% and 70% and one without compression (control). The specimens were conditioned in relative humidity (RH) of 60% with moisture content (MC) of 12%. Mechanical properties tested were shear modulus in LR, LT and RT planes by single cube test method, Young’s modulus in the L, R, T directions and poisson’s ratios in all planes. Results showed that in comparison with control specimen, the average improvement on density with CR improvement were 25%, 75%, 175% and 261% corresponding to CRs of 33%, 50%, 67% and 70% respectively. It was also found that Young’s modulus in the L and T directions increased significantly with the increase of CR. Shear modulus of RT plane increased with the rise of CR. Poisson’s ratios tended to decrease with increasing compression ratio of CW.

Keywords


Mechanical properties; compression ratio; compressed wood; Japanese cedar

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References


Dwianto, W., Norirnoto, M., Morooka, T.,Tanaka, F.,Inoue, M., and Liu, Y., 1998. Radial compression of sugi wood (Cryptomeria japonica D. Don). European Journal of Wood and Wood Products, 56(6): 403-411.

Hassel, B.I., Berard, P., Moden, CS., and Berglund, LA., , 2009. The single cube apparatus for shear testing - Full-field strain data and finite element analysis of wood in transverse shear. Composites Science and Technology 69(7-8): 877-882

Heger, F., Groux, M., Girardet, F., Wezbacher, C., Rapp, AO., and Navi, P., 2004. Mechanical and Durability Performance of THM-Densified Wood. Workshop COST Action E22’ Environmental Optimization of Wood Protection: 1-10.

Jung, K., Kitamori, A., and Komatsu, K., 2008. Evaluation on structural performance of compressed wood as shear dowel. Holzforschung 62(4): 461-467.

Kitamori, A., Jung, K., Mori, T., and Komatsu, K., 2010. Mechanical properties of compressed wood in accordance with the compression ratio. Mokuzai Gakkaishi 56(2): 67-78.

Kutnar, A., Kamke, FA., and Sernek, M., 2008. The mechanical properties of densified VTC wood relevant for structural composites. European Journal of Wood and Wood Products 66(6): 439-446.

Yoshihara, H. and Tsunematsu, S. 2007a. Bending and shear properties of compressed Sitka spruce. Wood Science and Technology 41(2): 117-131.

Yoshihara, H. and Tsunematsu, S., 2007b. Elastic properties of compressed wood Spruce with respect to its section obtained under various compression ratio. Forest Product Journal: 98-100.

Zhou, Y., Fushitani, M., Sato, K. and Ozawa, M., 2000. Bending creep behaviour of hot pressed wood under cyclic moisture change conditions. Journal of Wood Science 46: 423-430.




DOI: https://doi.org/10.51850/wrj.2016.7.1.1-5

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