摘要
To investigate the acoustic emission(AE)characteristics of quasi-brittle materials like rock and concrete,and to further analyze their damage and failure mechanism under seismic and other dynamic loads,the uniaxial tension test of granite cylinder specimens within the strain rate range of 10^-7-10^-4 s^-1 was monitored by AE technology,and the typical AE characteristic parameters were analyzed using statistical and correlation analysis.The experimental results show that,with the increase of strain rate,the peak of AE hit rate appears earlier and increases;the proportion of AE hits with higher duration or amplitude increases significantly,the b-value shows a decreasing trend,and the distribution of AE frequency-amplitude is increasingly discrete.In addition,the obvious characteristic of double dominant frequency bands was observed in AE waveforms by using spectrum analysis,with the increase of strain rate,the percentage of A-type waveforms corresponding to low dominant frequency band increases,while that of D-type waveforms corresponding to high ones decreases accordingly,which is significance for the further study of the damage and failure mechanism of quasi-brittle materials.
作者
王岩
WANG Na
WANG Zhaozhu
CHEN Yuzhi
WANG Yao
ZHAO Haitao
WANG Yan;WANG Na;WANG Zhaozhu;CHEN Yuzhi;WANG Yao;ZHAO Haitao(College of Civil and Transportation Engineering,Hohai University,Nanjing 210024,China;School of Architecture and Civil Engineering,Jinling Institute of Technology,Nanjing 211169,China)
基金
Funded by the National Natural Science Foundation of China(No.51878245)
the Fundamental Research Funds for the Central Universities(No.2019B13114)。