竹帘竹胶合板弹性常数的动态测试与分析  

Dynamic Test and Analysis of Elastic Constant of Bamboo Curtain Plywood

作　　者：兰昕苑 谷晓雨 陈清平 许斌 杨小军 王正 LAN Xin-yuan;GU Xiao-yu;CHEN Qing-ping;XU Bin;YANG Xiao-jun;WANG Zheng(College of Materials Science and Engineering,Nanjing Forestry University,Nanjing 210037,Jiangsu,P.R.China;Fujian Xinhengda Compartment Backplane Co.,Ltd.,Sanming 366035,Fujian,P.R.China)

机构地区：[1]南京林业大学材料科学与工程学院,江苏南京210037 [2]福建鑫恒达车厢底板有限公司,福建三明366035

出　　处：《林产工业》2023年第7期12-19,共8页China Forest Products Industry

基　　金：2021年江苏省现代农业产业单项技术研发项目[CX(21)3049]。

摘　　要：竹胶合板的弹性常数是决定其力学性能的重要指标。为了快速、简便、准确地检测竹帘竹胶合板的弹性模量、剪切模量和泊松比,采用自由板模态法和自由板瞬态激励法动态测试了竹帘竹胶合板的纵、横向板试件的弹性模量E和剪切模量G,采用悬臂板瞬态激励法动态测试了竹帘竹胶合板的泊松比μ;利用静态四点弯曲法试验验证了动态测试竹帘竹胶合板弹性模量、剪切模量和泊松比的准确性与可靠性;并对整板的质量等级、均质性和尺寸效应等进行了机理分析与评价。结果表明:竹帘竹胶合板的动态弹性模量、剪切模量和泊松比均值分别为0.7 GPa、1300 MPa和0.12,均符合GB/T13123—1991和LY/T 1575—2000中一等品规定要求;竹帘竹胶合板不满足G=E/2(1+μ)的关系式,为各向异性材料;动静态法测试得到竹帘竹胶合板试件弹性常数值一致,且动态测试法具有快速、简便、重复性好和精度高等优点。The elastic constant of bamboo curtain plywood is an important index to determine its mechanical properties.In order to detect the elastic modulus,shear modulus and Poisson's ratio of bamboo curtain plywood quickly,simply and accurately,the elastic modulus E and shear modulus G of longitudinal and transverse plate specimens of bamboo curtain plywood were tested by the free plate modal method and the free plate transient excitation method.The Poisson's ratioμwas tested by the cantilever plate transient excitation method.The static four-point bending method was used to verify the accuracy and reliability of dynamic testing of the elastic modulus,shear modulus,and Poisson's ratio of bamboo curtain plywood.The mechanism analysis and evaluation of the quality grade,homogeneity and size effect of the whole plate were carried out.The results showed that the dynamic elastic modulus,shear modulus,and Poisson's ratio of the bamboo curtain plywood were 0.7 GPa,1300 MPa and 0.12,respectively,which were in line with GB/T 13123—1991 and LY/T 1575—2000 product requirements.Since this kind of bamboo curtain plywood did not satisfy the relation of G=E/2(1+μ),it was an anisotropic material.The elastic constant values of the bamboo curtain plywood specimens obtained by the dynamic and static method were consistent,and the dynamic test method had the advantages of rapidity,simplicity,good repeatability,and high precision.

关 键 词：竹胶合板 弹性模量 剪切模量 泊松比 动态测试 四点弯曲法验证试验 

分 类 号：TS653[轻工技术与工程] TU366.2[建筑科学—结构工程]