榆木顺纹压缩率和PDR的变化规律研究  

Variation Laws of Longitudinal Compressive Ratio and PDR of Elm Wood

作　　者：张燕[1] 宋魁彦[1] 佟达[1] 

机构地区：[1]东北林业大学生物质材料科学与技术教育部重点实验室,哈尔滨150040

出　　处：《森林工程》2013年第2期51-53,共3页Forest Engineering

基　　金：国家自然科学基金(31070489)

摘　　要：对不同质量分数氢氧化钠碱液软化处理的榆木幼龄材和成熟材试材分别进行顺纹压缩试验,对其顺纹压缩率和永久变形率(PDR)的变化规律以及顺纹压缩后的恢复情况进行分析,试验结果表明:NaOH的质量分数为6%～7%,改性剂的质量分数为10%～15%时,获得最大顺纹压缩率和PDR值;相同顺纹压缩率时,溶液浓度和PDR值呈正相关,且幼龄材的PDR值大于成熟材;顺纹压缩后的恢复曲线分为弹性变形恢复阶段、弹塑性变形恢复阶段和塑性变形阶段;幼龄材的恢复速率小于成熟材。Longitudinal compressed juvenile and mature wood treated with sodium hydroxide solution of different mass fraction were tested. Longitudinal compressive ratio and PDR values as well as the rebounding condition after longitudinal compression were analyzed. Results showed that the longitudinal compressive ratio and PDR reached the maximum in 6-7 % mass fraction of sodium hydroxide and 10-15 % mass fraction of modifier. The PDR values increased with the increasing of solution concentration and the juvenile PDR values were higher than those of the mature in the same longitudinal compressive ratio. Longitudinal compressive rebounding curve was separated into three phases, namely elastic deformation rebounding, plastic-elastic deformation rebounding, and plastic de- formation phase. The rebounding rate of juvenile wood was smaller than that of mature wood.

关 键 词：碱液处理 顺纹压缩 PDR 顺纹压缩率 压缩恢复 

分 类 号：S781.23[农业科学—木材科学与技术]