林业工程学报2017，Vol.2Issue(4)：30-33,4.DOI:10.13360/j.issn.2096-1359.2017.04.005
低温环境下桦木顺纹抗压强度的研究
Study on compression strength parallel to grain of birch wood at low temperature
摘要
Abstract
The objective of this study was to investigate the effect of low temperature (-196-0℃) on compression strength parallel to the grain (CSPG) of birch.The CSPG with five different moisture contents (MC) that were water-saturated,green,fiber-saturated,air-dried and oven-dried were analyzed from-196℃ to 0℃.The five moisture contents were 136％,67％,29％,12％ and near to 0％.All specimens with a dimension of 20 (R) x20 (T) x30 (L) mm were cut from one piece of board.Seven temperatures were-196℃ (liquid nitrogen),-160℃,-110℃,-70℃,-30℃,0℃ and 20℃,being used in the experiments.The results showed that,when the temperature was below 0℃,the CSPG of specimen increased with the decreasing temperature.When the temperature decreased from 20℃ to-196℃,the CSPG of the birch wood with five different moisture contents increased by 821.24％,718.05％,632.87％,223.75％ and 95.28％,respectively.The relationships between the CSPG and temperature could be described by a linear for the five MC levels of wood.The slope of the line increased with the increase of the MC,in other words,the higher the MC,the faster increase in CSPG at the same low temperature.One of the primary reasons was that the frozen ice in the wood cell walls and lumens increased the CSPG of wood at low temperatures.The MC of the oven dry wood was near to 0％.When the test temperature reduced,the fiber and fiber glue materials of wood cell hardening was the main reason for the increase of the CSPG.关键词
低温环境/桦木/顺纹抗压强度/含水率Key words
low temperature/birch wood/compression strength parallel to grain/moisture content分类
通用工业技术引用本文复制引用
江京辉,于争争,赵丽媛,吕建雄,赵有科..低温环境下桦木顺纹抗压强度的研究[J].林业工程学报,2017,2(4):30-33,4.基金项目
中央级公益性科研院所基本科研业务费专项资金项目(CAFINT2013C09). （CAFINT2013C09）
