文献类型：期刊文献

英文题名：Mechanical properties assessment of Cunninghamia lanceolata plantation wood with three acoustic-based nondestructive methods

作者：Yin, Yafang[1] Nagao, Hirofumi[2] Liu, Xiaoli[1,3] Nakai, Takashi[4]

第一作者：殷亚方

通信作者：Yin, YF[1]

机构：[1]Chinese Acad Forestry, Res Inst Wood Ind, Beijing 100091, Peoples R China;[2]Forestry & Forest Prod Res Inst, Tsukuba, Ibaraki 3058687, Japan;[3]Beijing Museum Nat Hist, Beijing 100050, Peoples R China;[4]Chinese Acad Forestry, Japan Int Cooperat Agcy, Beijing 100091, Peoples R China

年份：2010

卷号：56

期号：1

起止页码：33-40

外文期刊名：JOURNAL OF WOOD SCIENCE

收录：;EI(收录号：20100712719789);Scopus(收录号：2-s2.0-76649138592);WOS:【SCI-EXPANDED(收录号:WOS:000274467700006)】；

基金：This study was financially supported by the JICA research project on timber from man-made forestry in China and the project of the Chinese State Forestry Administration (No. 2005-4-73). The technical guidance from Professor X. M. Jiang and Associate Professor X. Q. Luo of Chinese Academy of Forestry is gratefully acknowledged. The authors also thank C. Lum, senior scientist of Canadian Forest Products Innovation, for his advice.

语种：英文

外文关键词：Nondestructive method; Modulus of elasticity; Modulus of rupture; Compressive strength parallel-to-grain; Cunninghamia lanceolata plantation

摘要：The objectives of this study were to establish the method of evaluating wood mechanical properties by acoustic nondestructive testing at standing trees and at logs of a Chinese fir (Cunninghamia lanceolata (Lamb.) Hook.) plantation, and to compare three acoustic nondestructive methods for evaluating the static bending modulus of elasticity (MOE), modulus of rupture (MOR), and compressive strength parallel-to-grain (sigma(c)) of plantation wood as well. Fifteen Chinese fir plantation trees at 36 years of age were selected. Each tree was cut into four logs, for which three values of dynamic modulus of elasticity, i.e., E (sw), of the north and south face based on stress waves to assume the measuring state of the standing tree, E (fr), longitudinal vibration, and E (us), ultrasonic wave, were measured in the green condition. After log measurements, small specimens were cut and air-dried to 12% moisture content (MC). Static bending tests were then performed to determine the bending MOE and MOR, and compressive tests parallel-to-grain were made to determine sigma(c). The bending MOE of small clear specimens was about 7.1% and 15.4% less than E (sw) and E (us), respectively, and 11.3% greater than E (fr). The differences between the bending MOE and dynamic MOE of logs as determined by the three acoustic methods were statistically significant (P < 0.001). Good correlation (R = 0.77, 0.57, and 0.45) between E (sw), E (fr), and E (us) and static MOE, respectively, were obtained (P < 0.001). It can be concluded that longitudinal vibration may be the most precise and reliable technique to evaluate the mechanical properties of logs among these three acoustic nondestructive methods. Moreover, the results indicate that stress wave technology would be effective to evaluate wood mechanical properties both from logs and from the standing tree.