Parameters of acoustic emission test of concrete under static uniaxial tension
Parameters of acoustic emission test of concrete under static uniaxial tension
复制标题
混凝土单轴静拉声发射试验参数
DOI：
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发表时间：
2011
期刊：
影响因子：
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通讯作者：
Shen, De-Jian1
中科院分区：
文献类型：
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作者：
Wu, Sheng-Xing1;Wang, Yan1;Li, Jia1;Shen, De-Jian1
通过试验对声发射采集系统的硬件参数、滤波参数、声发射参数的设置及其相互关系进行了系统的研究，进行了11组悬式铅芯断裂试验和13个混凝土试件的单轴拉伸试验，采用数字参数存储器存储了3种传感器在试验过程中采集的声发射信号的特征参数和波形。波形采集系统，采用参数结合波形法和波形后提取技术对测试数据进行分析，结果表明：滤波器的增益、阈值、采样率、采样长度和带通滤波器的参数都有合理的取值;幅值、计数、持续时间、声发射信号能量、绝对能量和信号强度适合于评价混凝土单轴拉伸阶段性损伤特征;研究结果为利用声发射技术研究混凝土破坏过程提供了参考。
Setting of hardware parameters,filtering parameters for acoustic emission(AE) acquiring system,and AE parameters as well as their correlations were studied systematically with tests,11 groups of pensile lead break tests and 13 concrete specimens loaded in uniaxial tension were carried out.Feature parameters and waveforms of AE signals acquired by 3 kinds of sensors during the processes of tests were stored using a digital parameter-waveform collecting system.The test data were analyzed using the parameter combined with waveform method and the post-extracting technique for waveforms.The results showed that there are reasonable values for gain of preamplifier,threshold,sampling rate,sampling length and parameters of band pass filter;amplitude,count,duration,AE signal energy,absolute energy and signal strength are suitable for evaluating the phased damage feature of concrete under uniaxial tension loading;the significant correlations among amplitude,count,duration,rise time and signal strength are found.The study results provided a reference for studying on concrete failure process using AE technology.