Acoustic emission by steel fiber reinforced concrete under tensile damage

作者：Yan, Wang^*; Lu, Ge; Jie, Chen Shi; Li, Zhou; Ting, Zhang Ting

来源：Materialprufung, 2017, 59(7-8): 653-660.

DOI：10.3139/120.111048

• Concrete composite
• acoustic emission analysis
• wavelet analysis
• acoustic emission spectral analysis

In order to study the uniaxial tensile damage characteristics of steel fiber reinforced concrete at medium loading rate, tests at different steel fiber contents up to 1.5 % are performed and the acoustic emission wavelet energy spectrum is analyzed. Within the 20 to 40 kHz band, the peak frequency decreases with the increase of the steel fiber content at all damage stages. The peak frequency is affected by the size and the number of cracks, while the latter has a stronger effect. With the accumulation of damage, the amplitude and the energy of the waveform increase, the energy proportion in the low frequency bands also shows the same trend, but the peak frequency decreases. Thus, a nondestructive means for identifying the damage stage is provided.

• 出版日期2017-7
• 单位河海大学