| 足尺胶合板弹性模量的两对边简支振动检测研究 |
| |
| 引用本文： | 李焕,管成,张厚江,刘晋浩,周建徽,辛振波.足尺胶合板弹性模量的两对边简支振动检测研究[J].北京林业大学学报,2021,43(2):138-149. |
| |
| 作者姓名： | 李焕 管成 张厚江 刘晋浩 周建徽 辛振波 |
| |
| 作者单位： | 1.北京林业大学工学院，北京 100083 |
| |
| 基金项目： | 中央高校基本科研业务费专项资金资助;中国博士后科学基金面上资助项目;林业公益性行业科研专项 |
| |
| 摘 要： | 目的 研究足尺胶合板两个主要方向（即长度和宽度方向）弹性模量的两对边简支振动检测，为足尺胶合板两个主要方向弹性模量的在线无损检测提供一种新方法。 方法 以4种厚度共20块足尺胶合板为研究对象，采用有限元软件COMSOL Multiphysics和PULSE振动测试系统分别对两对边简支的足尺胶合板进行了模态灵敏度分析和试验模态分析；提出了一种两对边简支边界条件下的足尺胶合板弹性模量振动检测试验方法，运用此方法提取出足尺胶合板所需模态的频率，将其带入到编写的弹性模量检测算法中，用以计算足尺胶合板两个主要方向的动态弹性模量值；进行了三点弯曲静态试验检测足尺胶合板两个主要方向的静态弹性模量值，用以验证动态弹性模量检测结果的准确性。 结果 确定了用于计算足尺胶合板两个主要方向弹性模量的频率所对应的模态，分别为其自由振动前9阶模态中的第1阶模态（2, 0）和第7阶模态（2, 2）；厚度变化对足尺胶合板的前9阶模态的阶次排序没有影响；足尺胶合板两个主要方向的动态弹性模量均大于静态弹性模量，且同一厚度足尺胶合板的力学性能存在不均匀性；足尺胶合板长度和宽度方向的动态弹性模量与静态弹性模量间均具有显著的线性关系，决定系数分别为0.907和0.655。 结论 基于两对边简支振动和弹性模量振动检测算法检测足尺胶合板两个主要方向的弹性模量具有可行性。
|
| 关 键 词： | 足尺胶合板 两对边简支 弹性模量 振动检测 |
| 收稿时间： | 2020-10-06 |
Determining modulus of elasticity of full-size plywood panel simply supported on two opposite sides using a vibration method |
| |
| Li Huan,Guan Cheng,Zhang Houjiang,Liu Jinhao,Zhou Jianhui,Xin Zhenbo.Determining modulus of elasticity of full-size plywood panel simply supported on two opposite sides using a vibration method[J].Journal of Beijing Forestry University,2021,43(2):138-149. |
| |
| Authors: | Li Huan Guan Cheng Zhang Houjiang Liu Jinhao Zhou Jianhui Xin Zhenbo |
| |
| Institution: | 1.School of Technology, Beijing Forestry University, Beijing 100083, China2.Joint International Research Institute of Wood Nondestructive Testing and Evaluation, Beijing Forestry University, Beijing 100083, China3.University of Northern British Columbia, Prince George, British Columbia V2L 16R, Canada |
| |
| Abstract: | Objective]To provide a new method for the online non-destructive determination for modulus of elasticity(MOE)in two main directions of a full-size plywood panel,the vibration determination for MOE in two main directions of a full-size plywood panel simply supported on two opposite sides was studied.Method]20 pieces of full-size plywood panels with four different thicknesses were used as study objects.The modal sensitivity analysis and experimental modal analysis of full-size plywood panels simply supported on two opposite sides were performed using finite element software COMSOL Multiphysics and the PULSE vibration test system.The frequencies of needed modes were obtained by a vibration detection method for MOE of the full-size plywood panel proposed in this study,then incorporated into a vibration detection algorithm of the dynamic MOE in two main directions of a full-size plywood panel.In order to verify the accuracy of the dynamic MOE values measured,the static MOE values in two main directions of a full-size plywood panel were also obtained through three-point bending test.Result]The frequencies of free vibration modes(2,0)and(2,2)as the first and seventh modes in the first nine modes of the full-size plywood panel were conducted for calculation of MOE in the length and width directions of the panels,respectively.The results revealed that thickness variation had no effect on the ordering of the first nine modes for the full-size plywood panels.The dynamic MOE values were greater than the static ones of the full-size plywood panels,and there existed inhomogeneity of mechanical properties for the full-size plywood panels with the same thickness.Dynamic MOE had a strong correlation with static MOE in both length and width directions of the full-size plywood panels(R2=0.907 and 0.655,respectively).Conclusion]It is feasible for determining MOE of a full-size plywood panel based on two-opposite-side vibration and vibration detection algorithm for MOE. |
| |
| Keywords: | full-size plywood panel simply supported on two opposite sides modulus of elasticity(MOE) vibration test |
| 本文献已被 CNKI 维普 万方数据 等数据库收录！ |
| 点击此处可从《北京林业大学学报》浏览原始摘要信息 |
| 点击此处可从《北京林业大学学报》下载免费的PDF全文 |
|
