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Open AccessArticle

Orthotropic Tension Behavior of Two Typical Chinese Plantation Woods at Wide Relative Humidity Range

1
College of Materials Science and Engineering, Nanjing Forestry University, Nanjing 210037, China
2
Hunan Provincial Collaborative Innovation Center for High-Efficiency Utilization of Wood and Bamboo Resources, Central South University of Forestry and Technology, Changsha 410004, China
*
Author to whom correspondence should be addressed.
Forests 2019, 10(6), 516; https://doi.org/10.3390/f10060516
Received: 2 June 2019 / Revised: 13 June 2019 / Accepted: 18 June 2019 / Published: 19 June 2019
(This article belongs to the Special Issue Wood Properties and Processing)
Research Highlights: Orthotropic tension behaviors of poplar and Chinese fir were investigated at a wide relative humidity (RH) range. Background and Objectives: Poplar and Chinese fir are typical plantation tree species in China. Mechanical properties of plantation-grown wood varies from naturally-grown one. To utilize poplar and Chinese fir woods efficiently, fully understanding their moisture content (MC) and orthotropic dependency on tension abilities is necessary. Materials and Methods: Plantation poplar and Chinese fir wood specimens were prepared and conditioned in series RH levels (0–100%). Tensile modulus (E) and strength (σ) were tested in longitudinal (L), radial (R), and tangential (T) directions. Results: The E and σ results in transverse directions confirmed the general influence of the MC that decreased with increasing MC. However, both E and σ in L direction showed a trend that increased at first, and then decreased when MC increased. The local maximums of stiffness and strength may be associated with straightened non-crystalline cellulose, induced by the penetration of water into the wood cell wall. Using the visualization method for compliance, the tension abilities of poplar and Chinese fir exhibited clear moisture and orthotropic dependency. Conclusion: Both poplar and Chinese fir showed a significantly higher degree of anisotropy in the L, R, and T directions. The results in this study provided first-hand data for wooden construction and wood drying. View Full-Text
Keywords: orthotropic; tensile modulus; tensile strength; moisture content; relative humidity orthotropic; tensile modulus; tensile strength; moisture content; relative humidity
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MDPI and ACS Style

Kuai, B.; Wang, X.; Lv, C.; Xu, K.; Zhang, Y.; Zhan, T. Orthotropic Tension Behavior of Two Typical Chinese Plantation Woods at Wide Relative Humidity Range. Forests 2019, 10, 516.

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