复配碱液处理榆木顺纹压缩应力-应变本构关系  

Stress-Strain Constitutive Relations of Longitudinal Compressed Elm Wood with Compound Alkali Liquor Processing

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：《林业科学》2012年第11期83-86,共4页Scientia Silvae Sinicae

基　　金：国家自然科学基金项目(31070489);黑龙江省攻关课题(GA09B202-07)

摘　　要：采用复配碱液处理榆木后,对榆木的幼龄材和成熟材顺纹压缩,通过建立的榆木顺纹压缩应力-应变本构关系得出:在榆木顺纹压缩初始阶段,符合线形的弹性虎克定律;在弹塑性阶段,也基本符合线形的力学关系。分析榆木幼龄材在顺纹压缩中体现出较大的差异性、顺纹压缩弹性模量和应力、应变的原因是木材化学组分的降解和抽出;得出复配碱液处理后木材顺纹压缩弹性、弹塑性变化的基本规律,木材在弹塑性阶段呈一段平滑的曲线,细胞壁在此阶段形成褶皱。The elasticity and elastoplasticity variation laws of longitudinal compressing elm wood study could enhance wood one-way bending performance in order to achieve wood multi-dimensional bending.Juvenile and mature elm wood was longitudinal compressed after compound alkali liquor processing,then stress-strain constitutive relations were established.The results showed that at the beginning of compressing,the curves of stress and strain accorded with linear Hooke＇s Law,similarly,they satisfied a linear mechanic relationship in the elastoplasticity region.During longitudinal compressing,why juvenile elm wood has high variability,longitudinal compressive modulus of elasticity,stress and strain,which attribute to the degradation and extractive of elm wood chemical component after compound alkali liquor processing,were analyzed.Then basic variation laws of elasticity and elastoplasticity were found.In the elastic-plastic region,stress-strain curves displayed smoothly,in which folds were formed on wood cell walls.

关 键 词：榆木 顺纹压缩 幼龄材 成熟材 应力应变规律 

分 类 号：S781.2[农业科学—木材科学与技术]