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榫卯结构弯曲破坏时声发射衰减特性与源定位

赵小矛 焦亮亮 赵健 赵东

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. doi: 10.13332/j.1000-1522.20160150
引用本文: 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. doi: 10.13332/j.1000-1522.20160150
ZHAO Xiao-mao, JIAO Liang-liang, ZHAO Jian, ZHAO Dong. Acoustic emission attenuation and source location on the bending failure of the rectangular mortise-tenon joint for wood structures[J]. Journal of Beijing Forestry University, 2017, 39(1): 107-111. doi: 10.13332/j.1000-1522.20160150
Citation: ZHAO Xiao-mao, JIAO Liang-liang, ZHAO Jian, ZHAO Dong. Acoustic emission attenuation and source location on the bending failure of the rectangular mortise-tenon joint for wood structures[J]. Journal of Beijing Forestry University, 2017, 39(1): 107-111. 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

doi: 10.13332/j.1000-1522.20160150
基金项目: 

国家自然科学基金项目 11502022

详细信息
    作者简介:

    赵小矛,博士生,副教授。主要研究方向:家具设计及家具力学。Email: zhao_x_m@163.com  地址:100083  北京市海淀区清华东路35号北京林业大学工学院

    责任作者:

    赵东,博士,教授。主要研究方向:工程力学、农业机械。Email: Zhaodong68@bjfu.edu.cn  地址:同上

  • 中图分类号: S781.29; TU366.2

Acoustic emission attenuation and source location on the bending failure of the rectangular mortise-tenon joint for wood structures

  • 摘要: 由于木结构榫卯接合的部位属于隐藏部位,当其发生损伤时,肉眼无法观测。为了准确地预测榫卯结构的健康状况, 可以根据榫卯结构在破坏前,木材所释放出来的声发射能量传播特性进行信息源位置的判定。为此, 本研究提出并验证了木材的声发射信号符合能量衰减规律,并且利用能量衰减模型对榫卯结构的声发射源(破坏源)进行定位。首先,采用直径0.5 mm的铅芯为模拟声发射源,探讨了声发射波在木材中的传播和衰减特性,然后进行了榫卯结构弯曲破坏实验,实验中将目标声发射源限定于两个传感器之间,利用两点定位法确定破坏源的位置, 经比较计算值与实测值较一致。结果表明:基于AE信号能量衰减模型和两点定位法进行榫卯结构的损伤定位,能得到较准确的破坏源位置,而且外界环境对结果的影响较小。

     

  • 图  1  两点定位原理图

    Figure  1.  Two point location diagram

    图  2  接合构件的尺寸

    Figure  2.  Dimensions of joint members

    图  3  声发射实验示意图

    Figure  3.  Diagram of acoustic emission experiment

    图  4  木材AE信号能量衰减规律实验

    Figure  4.  Experiment of acoustic emission energy attenuation for wood

    图  5  榫结构弯曲破坏源定位实验

    Figure  5.  Source location experiment of bending fracture for tenon structure

    图  6  声发射能量随距离衰减折线图

    Figure  6.  Attenuation line chart of energy and acoustic source distance

    表  1  不同声源距离时的能量比值

    Table  1.   Experimental value of energy ratio of different acoustic source distance

    声源距离
    Acoustic source distance/mm
    1号传感器的能量值E1
    Energy value of sensor 1/(mV·ms)
    2号传感器的能量值E2
    Energy value of sensor 2/(mV·ms)
    能量比k12
    Energy ratio k12
    705 452.665 343.611.02
    905 563.855 230.011.06
    1105 442.855 116.271.06
    1305 616.424 717.801.19
    1505 598.534 534.811.23
    1705 623.693 824.111.47
    1905 536.393 495.231.58
    2105 445.063 111.461.75
    下载: 导出CSV

    表  2  能量衰减系数α

    Table  2.   Coefficient of energy attenuation α

    声源距离Acoustic source distance /mm7090110130150170190210
    能量衰减系数α Coefficient of energy attenuation α1.6311.5481.4821.4551.4191.4201.4051.397
    下载: 导出CSV

    表  3  木榫结构弯曲破坏源定位计算值与实测值

    Table  3.   Value of calculation and measurement of source location on the bending failure for mortise-tenon

    试件
    Specimen
    1号传感器的能量值E1
    Energy value of sensor 1 E1/(mV·ms)
    2号传感器的能量值E2
    Energy value of sensor 2E2/(mV·ms)
    能量比k12
    Energy ratio k12
    计算值
    Calculation value r(t)/mm
    实测值
    Measurement value r(t)/mm
    相对误差
    Relative error/%
    120 078.5316 846.561.1932.633.11.51
    215 703.8613 600.361.1532.132.71.83
    35 508.694 522.651.2232.933.72.37
    426 211.3925 233.371.0430.631.63.15
    58 252.227 291.551.1331.832.72.75
    平均值mean15 150.9413 498.891.1532.032.82.32
    下载: 导出CSV
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出版历程
  • 收稿日期:  2016-05-09
  • 修回日期:  2016-07-04
  • 刊出日期:  2017-01-01

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