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- W2348773726 abstract "Using TAW-2000 servo testing machine and Germany VallenAMSY-6 acoustic emission signal acquisition system,the acoustic emission characteristics of marble under uniaxial compression,constant amplitude cyclic loading and unloading and tiered cyclic loading and unloading were studied. In addition,using Fast Fourier Transformation( FFT),the acoustic emission spectrum characteristics of marble under uniaxial compression and Kaiser points and Felicity points in the process of tiered cyclic loading and unloading were analyzed. Test results show that: Firstly,main frequency locate mainly in two areas,which are the regions less than 200 kHz and near 300 kHz,and the main frequency varies from low frequency to high frequency and the amplitude of main frequency declines on the whole with the increasing stress. Secondly,a new indicator to reflect acoustic emission waveform information,namely SF( secondary frequency)-by-MF( main frequency) ratio α,was put forward and in the process of uniaxial compression test SF( secondary frequency)-by-MF( main frequency) shows ascendant trend. Thirdly,the change of main frequency at Kai-ser point and Felicity point is not obvious and the SF( secondary frequency)-by-MF( main frequency) ratio at Felicity point is higher than the one at Kaiser point in the hierarchical cyclic loading and unloading process. At last,by regarding AE( Acoustic Emission) counts at the point of stress in the second cycle whose stress is equal to the peak stress of first cycle as the significant increasedscale of Kaiser effect,obvious Felicity effect is showed." @default.
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- W2348773726 date "2014-01-01" @default.
- W2348773726 modified "2023-09-23" @default.
- W2348773726 title "Experimental on acoustic emission characteristics of marble with different stress paths" @default.
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