复配碱液处理榆木顺纹压缩应力-应变本构关系.pdfVIP

业 学 林 科 Vo I. 48 , No.11 第 48 卷第 11 期 SCIENTIA SILVAE SINICAE 2012 年 11 月 Nov. ,2012 复配碱液处理榆木顺纹压缩应力-应变本构关系牢 张燕宋魁彦佟达 (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) 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榴皱。 关键词: 榆木; J吸纹压缩;幼龄材;成熟材;应力应变规律 中圈分类号:578 1. 2 文献标识码:A 文章编号: 1001 -7488(2012)11- ∞83 -04 Stress-Strain Constitutive Relations of Longitudinal Compressed Elm Wood with Compound Alkali Liquor Processing Zhang Yan Song Kuiyan Tong Da (Key Laboratory 01 Bio-Bαsed ldaterial 8cu町e and Technlogy 0/ Ministry 0/ Educat四n Nðrtheast Fo-re3try Un.i.:ψersicy Harb如 150040) Abstract: The elasticity and elastopìasticity variation laws of longitudinal compressing elm wood study could enhance wood one-way bending performance in order to achieve wood multi-dimensional bending. luvenile and mature elm wood was longitudinal cornpressed after compound alkali liquor processîng , then stress-straÎn constítutive relatíons were establíshed. The results showed that at the beginning of cornpressing , the curves of stress and straÎn accorded with linear Hooke s Law , similarly , they satisfied a linear mechanic relationship in the elastoplasticity regíon. During longitudinal compressing , why juvenile elm wood has high variability , longitudinal compressive modulus of elasti