含水率对竹胶合板力学性能的影响及纤维饱和点测定  

Effects of moisture content on mechanical properties of bamboo plywood and measurement of fiber saturation point

作　　者：彭亮[1] PENG Liang(Hunan Academy of Forestry,Changsha 410004,China)

机构地区：[1]湖南省林业科学院

出　　处：《湖南林业科技》2019年第5期28-32,共5页Hunan Forestry Science & Technology

基　　金：湖南省重点研发计划(2016NK2144)

摘　　要：通过设置含水率8%~60%均匀分布的胶合板,研究了七层等厚正交结构竹胶合板静曲强度和弹性模量受含水率影响的变化规律,采用Boltzmann曲线拟合和一元线性回归分析方法建立了数学模型,得出了竹胶合板力学性能转折点的纤维饱和点含水率平均值为21.72%。结果表明:胶合板含水率从8%增加到纤维饱和点时,静曲强度和弹性模量降幅50%左右,竹胶合板含水率达到纤维饱和点以后,随着含水率的增加胶合板力学性能保持稳定,与竹材本身的力学性能随含水率的变化趋势一致。By setting up plywood with 8%~60% moisture content uniformly distributed, the change rule of static bending intensity and modulus of elasticity of bamboo plywood with seven-layer orthogonal structure and equal thickness affected by moisture content was studied.The mathematical model was established by adopting Boltzmann curve fitting and linear regression analysis method, and the fiber saturation point at the turning point of mechanical properties of bamboo plywood was obtained at the average value 21.72%.The results showed that when the moisture content of plywood increased from 8% to the fiber saturation point, static bendingintensity and modulus of elasticity decreased by about 50%.After the moisture content of bamboo plywood reached the fiber saturation point, the mechanical properties of plywood remained stable with the increasing moisture content, which was consistent with the changing trend of the mechanical properties of bamboo with the moisture content.

关 键 词：竹胶合板 含水率 纤维饱和点 力学性能 

分 类 号：TU531.3[建筑科学—建筑技术科学]