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Title: Effect of Temperature and Moisture State Changes on Modulus of Elasticity of Red Pine Small Clear Wood

Source: In: Gen. Tech. Rept. FPL-GTR-226. Madison, WI: U.S. Department of Agriculture, Forest Service, Forest Products Laboratory. p. 442-450.

Author(s)Gao, Shan; Wang, Xiping; Wang, Lihai

Publication Year: 2013  View PDF »

Category: Conference Proceedings
Associated Research Project(s):   FPL-4714-1B

Abstract: This study examined the response of dynamic and static modulus of elasticity (MOE) of red pine small clear wood to a temperature change from -40 to 40 °C. The 25.4×25.4×407 mm red pine specimens used in this study were selected from those used in a previous laboratory investigation of acoustic properties. The moisture content (MC) of the specimens ranged from 0% to 118.3%. The dynamic MOE was calculated based on measured acoustic velocity and the wood density at the time of acoustic measurement. The static MOE was measured by conducting a static bending test in a laboratory-controlled environment chamber with wood temperature changing from -40 to 40 °C. Our results indicated that both static and dynamic MOE of wood were affected by temperature and the state of moisture in wood. Above freezing point, MOE decreased linearly at a slow rate as wood temperature increased. Below freezing point, MOE increased at a rapid rate as wood temperature dropped. We found that MC of wood had a significant compounding effect on the MOE-temperature relationships. Temperature effect was much more significant in green wood than in dry wood. Mathematical models were developed to predict the percentage change of MOE relative to the standard temperature of 20 °C for wood temperature below and above freezing point. It is concluded that dynamic MOE of wood based on acoustic measurements can be used as a good predictor of static MOE for nondestructive evaluation of wood under a range of wood temperatures.

Keywords: acoustic velocity, dynamic modulus of elasticity (MOE), static MOE, small clear wood, temperature, moisture content, freezing point

Publication Review Process: Non-Refereed (Other)

File size: 514 kb(s)

Date posted: 10/24/2013
RITS Product ID: 66551
Current FPL Scientist associated with this product
Wang, Xiping
Research Forest Products Technologist
  

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