文献类型：期刊文献

英文题名：Influence of Density and Equilibrium Moisture Content on the Hardness Anisotropy of Wood

作者：Peng, Hui[1] Jiang, Jiali[1] Zhan, Tianyi[1] Lu, Jianxiong[1]

第一作者：Peng, Hui

通信作者：Jiang, JL[1]|[a0005c4a974b7fbd344a8]蒋佳荔;

机构：[1]Chinese Acad Forestry, Res Inst Wood Ind, State Key Lab Tree Genet & Breeding, Beijing, Peoples R China

年份：2016

卷号：66

期号：7-8

起止页码：443-452

外文期刊名：FOREST PRODUCTS JOURNAL

收录：;EI(收录号：20170503313955);Scopus(收录号：2-s2.0-85010936392);WOS:【SCI-EXPANDED(收录号:WOS:000392048500008)】；

基金：This research was sponsored by the National Natural Science Foundation of China (31570548)

语种：英文

外文关键词：Anisotropy - Elasticity - Forestry - Moisture - Moisture determination - Ovens - Softwoods

摘要：The aim of this study was to investigate the anisotropic characteristics of Brinell hardness for six species (softwood, Chinese fir [Cunninghamia lanceolata (Lamb.) Hook.], Red pine [Pinus koraiensis Sieb. et Zucc.], Mongolian scotch pine [Pinus sylvestris L. var. mongolica Litv.]; hardwood, Manchurian walnut [Juglans mandshurica Maxim.], Asian white birch [Betula platyphylla Suk.], Mongolian oak [Quercus mongolica Fisch. et Turcz.]) with the equilibrium moisture content (EMC) obtained at four relative humidity (RH) levels (20 degrees C; 50%, 65%, 85%, and 95% RH). The results showed that the cross section of specimens presented higher Brinell hardness and lower elastic recovery than those tested on radial and tangential surfaces. Ovendried density was significantly positively correlated with Brinell hardness. With the exception of softwood on a tangential surface (r = 0.02), there was a statistically significant positive correlation of elastic recovery against ovendried density (at the 0.01 level). We found that a general increase in EMC significantly lowered the Brinell hardness for six species, irrespective of grain orientation. The decreased extent of relative Brinell hardness (HB/HB0) was highest for cross section samples, compared with radial and tangential surfaces. For three softwood species, the decreased extent of HB/HB0 on the radial surface was higher than that on the tangential surface, whereas the opposite relationship was found in three hardwood species. The results indicated that rays were probably the main factor controlling transverse anisotropy in hardwood, while the interaction of earlywood and latewood was more important for softwood. In addition, elastic recovery anisotropy was probably owing to different failure behavior in three directions, and it was difficult to establish a direct influence of EMC on elastic recovery.