0.069725036621091195188FPLFPLPublished to Web1Publication1Formally Refereed1Scientific Journal (JRNL)<![CDATA[Variations in orthotropic elastic constants of green Chinese larch from pith to sapwood]]> 20192019Full sets of elastic constants of green Chinese larch (<em>Larix principis-rupprechtii</em> Mayr) with 95% moisture content at four different cross-section sampling positions (from pith to sapwood) were determined in this work using three-point bending and compression tests. Variations in the material constants of green Chinese larch from pith to sapwood were investigated and analyzed. The results showed that the sensitivity of each elastic constant to the sampling position was different, and the coefficient of variation ranged from 4.3% to 48.7%. The Poisson’s ratios <sup><em>ν</em></sup>RT measured at four different sampling positions were similar and the differences between them were not signifcant. The coefficient of variation for Poisson’s ratio νRT was only 4.3%. The four sampling positions had similar Poisson’s ratios<sup><em> ν</em></sup>TL, though the coefficient of variation was 11.7%. The Poisson’s ratio <sup><em>ν</em></sup>LT had the greatest variation in all elastic constants with a 48.7% coefficient of variation. A good linear relationship was observed between the longitudinal modulus of elastic <sup><em>E</em></sup>L, shear modulus of elasticity <sup><em>G</em></sup>RT, Poisson’s ratio<sup><em> ν</em></sup>RT, and sampling distance. EL, GRT, and νRT all increased with sampling distance R. However, a quadratic relationship existed with the tangential modulus of elasticity ET, radial modulus of elasticity ER, shear modulus of elasticity GLT, and shear modulus of elasticity GLR. A discrete relationship was found in the other fve Poisson’s ratios. The results of this study provide the factual changes in the elastic constants of green wood from pith to sapwood for numerical modelling of stress wave propagation in trees or logs10.3390/f10050456https://www.fpl.fs.fed.us/documnts/pdf2019/fpl_2019_liu001.pdf2.0 MBhttps://www.fs.usda.gov/treesearch/pubs/58691586910Forests. 10(5). 16 p.010516T0Liu, Fenglu ; Zhang, Houjiang ; Jiang, Fang ; Wang, Xiping ; Guan, Cheng ; 13-SEP-2019 13:55:2719-SEP-2019 08:02:06AY19-SEP-2019 08:02:06Liu, Fenglu 001Zhang, Houjiang 002Jiang, Fang 003Wang, Xiping FPL4714xwang119114Guan, Cheng 005Liu, Fenglu 001Zhang, Houjiang 002Jiang, Fang 003Wang, Xiping FPL4714xwang119114Guan, Cheng 0054RUResource Management and Usehttp://www.fs.fed.us/research/resource-management/FPL-4714-2BDevelop information on the engineering properties and performance of wood based structural productsFPL-4714-MBPublic serviceThis article was written and prepared by U.S. Government employees on official time, and is therefore in the public domain.

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