Acoustic Emissions at High and Low Frequencies During Compression Tests in Brittle Materials
Acoustic Emissions at High and Low Frequencies During Compression Tests in Brittle Materials
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DOI：
10.1111/j.1475-1305.2010.00745.x
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发表时间：
2011-12
期刊：
影响因子：
2.1
通讯作者：
A. Schiavi;G. Niccolini;P. Tarizzo;A. Carpinteri;G. Lacidogna;A. Manuello
中科院分区：
文献类型：
--
作者：
A. Schiavi;G. Niccolini;P. Tarizzo;A. Carpinteri;G. Lacidogna;A. Manuello
摘要：通过检测由于微裂纹和宏观裂纹生长而传播的弹性波，研究了单轴压缩试验混凝土试件的损伤过程。除了高频声发射 (AE) 之外，在样本失效之前还检测到 1 至 10 kHz 的低频弹性发射 (ELE) 的存在。 ELE 的频谱分析是通过使用校准传感器测量样品表面的局部加速度来进行的。由此获得关于释放能量方面的宏观裂纹效应的定量信息。此外，通过分析 AE 和 ELE 信号的幅度分布来跟踪损伤的演变，这些信号根据 Gutenberg-Richter (GR) 统计数据进行分布。
Abstract: The damage process in a concrete specimen subjected to uniaxial compression test is investigated by detection of the propagating elastic waves because of micro‐ and macrocrack growth. Besides the high‐frequency acoustic emissions (AEs), the presence of low‐frequency elastic emissions (ELEs), from 1 to 10 kHz, is detected just before the specimen failure. A spectral analysis of the ELEs is performed by measuring with a calibrated transducer the local acceleration of the specimen surface. Quantitative information about the macrocrack effects in terms of released energy is thus obtained. Furthermore, the evolution of damage is followed through the analysis of the amplitude distribution of AE and ELE signals, distributed according to the Gutenberg–Richter (GR) statistics.