基于悬臂振动原理的薄板木质材料动态黏弹性检测  

Detection on the dynamic viscoelasticity of thin wood composites based on cantilever beam free vibration

作　　者：周卢婧 张厚江[1] 闫海成[1] 廖春晖[1] 

机构地区：[1]北京林业大学工学院,北京100083

出　　处：《南京林业大学学报（自然科学版）》2014年第2期26-30,共5页Journal of Nanjing Forestry University：Natural Sciences Edition

基　　金：国家林业公益性行业科研专项项目(201304512)

摘　　要：为了快速检测薄板木质材料动态黏弹性这一表征其力学性能的重要指标,以刨花板、中密度纤维板、高密度纤维板和木塑板等4种材质的薄板木质材料为研究对象,利用自行研制的薄板木质材料力学性能检测分析仪,测量出试件在悬臂自由振动时的第一阶固有频率,以及振动过程中的对数减幅系数,进而获得材料的动态黏弹性性能,包括储能模量和损耗模量。并将测量结果与传统的强迫振动动态黏弹性检测方法的测量值进行对比分析。结果表明:两种测量结果之间有显著的线性关系,基于悬臂梁自由振动原理的薄板木质材料动态黏弹性检测方法是可行的。For the purpose of detecting the dynamic viscoelasticity of wood composites which is one of several important indicators to characterize mechanical properties, five sets of commercially purchased thin wood composites having four different fiber types were selected as experimental materials. Using a mechanical property analyzer which was newly self-developed , the first order frequency of the specimen cantilever vibrating and logarithmic decrement of the vibration wave-form were measured to calculate the dynamic viscoelasticity including the storage modulus and loss modulus. The dynamic viscoelasticity of the same specimens was also detected by the conventional method based on forced vibration. The results showed that there was a very significant linear correlation between them. It was feasible that the detection method of the dynamic viscoelasticity of the thin wood composites based on the principle of cantilever-beam free vibra-tion.

关 键 词：薄板木质材料 悬臂自由振动 动态黏弹性 储能模量 损耗模量 

分 类 号：TS653.5[轻工技术与工程]