北京林业大学学报2017，Vol.39Issue(1)：107-111,5.DOI:10.13332/j.1000-1522.20160150
榫卯结构弯曲破坏时声发射衰减特性与源定位
Acoustic emission attenuation and source location on the bending failure of the rectangular mortise-tenon joint for wood structures
摘要
Abstract
Since the mortise-tenon joints of wood structures are hidden members, the fracture location of the mortise-tenon joints could not be tested accurately by naked eyes. In order to predict accurately the health condition of the mortise-tenon joints, acoustic emission information location could be detected according to the propagation properties of acoustic emission energy released by wood before the mortise-tenon joints fracture. Energy attenuation law of the acoustic emission signal for wood was verified in this paper, and a new method was proposed to locate the damage of mortise-tenon joints based on energy attenuation model for wood. Firstly, using 0. 5 mm diameter pencil lead as artificial acoustic emission source, acoustic emission wave propagation and attenuation characteristics were discussed for wood. And then the bending failure experiments of the mortise-tenon joints were studied. In the process of the experiments, acoustic emission source was located between the two sensors, and two-point positioning method was used to determine the fracture location of the mortise-tenon joints. The calculation values of the fracture location agreed with the experimental ones. The results show that the positioning method could acquire accurate fracture location based on energy attenuation model of the AE signal and two-point method, and the results are less affected by the external environment.关键词
榫卯结构/声发射/能量衰减/定位/木结构Key words
mortise-tenon joint/acoustic emission/energy attenuation/location/wood structure分类
农业科技引用本文复制引用
赵小矛,焦亮亮,赵健,赵东..榫卯结构弯曲破坏时声发射衰减特性与源定位[J].北京林业大学学报,2017,39(1):107-111,5.基金项目
国家自然科学基金项目(11502022)。 （11502022）
