Open Access
ARTICLE
Influence of Aspect Ratio on Rolling Shear Properties of Fast-Grown Small Diameter Eucalyptus Lumber
Tao Gui1, Shichen Cai1, Zhiqiang Wang1,*, Jianhui Zhou2,*
1 College of Materials Science and Engineering, Nanjing Forestry University, Nanjing, 210037, China
2 Integrated Wood Engineering, University of Northern British Columbia, Prince George, V2L 1R7, Canada
* Corresponding Authors: Zhiqiang Wang. Email: ; Jianhui Zhou. Email:
(This article belongs to this Special Issue: Recent Developments on Biobased Materials and Composites)
Journal of Renewable Materials 2020, 8(9), 1053-1066. https://doi.org/10.32604/jrm.2020.011645
Received 21 May 2020; Accepted 19 June 2020; Issue published 03 August 2020
Abstract
Eucalyptus is a major fast-grown species in South China, which has the
potential for producing structural wood products such as cross-laminated timber
(CLT). Aspect ratio (board width
vs. board thickness) of eucalyptus lumbers is
small due to the small diameter of fast-grown eucalyptus wood. To evaluate its
rolling shear modulus and strength for potential CLT applications, three-layer
hybrid CLT shear block specimens with different aspect ratios (2,4,6), were tested
by planar shear test method. Digital image correlation (DIC) was employed to
measure the rolling shear strain distribution and development during the planar
shear tests. The mean values of rolling shear modulus and strength of eucalyptus
lamination were 260.3% and 88.2% higher than those of SPF(
Spruce-pine-fir)
lamination with the same aspect ratio of 4, respectively. The rolling shear properties of eucalyptus laminations increased as the aspect ratio increased. Aspect ratio
had a significant influence on rolling shear modulus compared to rolling shear
strength. The high shear strain regions were primarily found around the gaps
between segments of cross layer. The quantity of high shear strain regions
increased as the aspect ratio of lamination decreased. Other high shear strain
regions also occurred around the pith and along the glue line. The sudden failure
of specimen occurred in the high strain region. In conclusion, the rolling shear
strength and modulus of fast-grown eucalyptus laminations exceed the respective characteristic values for softwoods in the current standard by roughly
factors of 3 and 8, indicating great potential for fast-grown eucalyptus wood
cross-layers in CLT.
Keywords
Cite This Article
Gui, T., Cai, S., Wang, Z., Zhou, J. (2020). Influence of Aspect Ratio on Rolling Shear Properties of Fast-Grown Small Diameter Eucalyptus Lumber.
Journal of Renewable Materials, 8(9), 1053–1066. https://doi.org/10.32604/jrm.2020.011645
Citations