Cyclic loading of marble:Correlating the attenuation of the electric and acoustic activities and highlighting criticality indices in terms of natural time  

作　　者：Dimos Triantis Ilias Stavrakas Ermioni D.Pasiou Stavros K.Kourkoulis 

机构地区：[1]University of West Attica,Department of Electrical&Electronics Engineering,Electronic Devices and Materials Laboratory,Ancient Olive Grove Campus,Athens 12244,Greece [2]National Technical University of Athens,School of Applied Mathematical and Physical Sciences,Department of Mechanics,Laboratory for Testing and Materials,Athens 15773,Greece

出　　处：《International Journal of Mining Science and Technology》2025年第2期159-174,共16页矿业科学技术学报(英文版)

摘　　要：The attenuation of the acoustic activity in marble specimens under uniaxial compressive loadingunloading loops is quantified in juxtaposition to that of the electric activity.In parallel,the existence of"pre-failure indiceso"warning about entrance into a critical stage,that of impending fracture,is explored.The acoustic activity is quantified in terms of the normalized number of acoustic hits,their average rate of production and their cumulative energy,and,the cumulative counts and their average rate of change.The electric activity is studied in terms of the pressure stimulated currents and the electric charge released.The analysis revealed that the acoustic and electric activities are linearly correlated to each other,suggesting that they are different manifestations of the same damage mechanisms.In addition,Kaiser's effect,governing the acoustic activity,is found to govern,also,the electric activity.Moreover,it is concluded that entrance into the critical stage is safely predicted by means of a simple criterion,based on the evolution of the average rate of change of the normalized cumulative counts in the natural time domain.These predictions are almost identical with those of the criterion based on the "varianceo" and the "entropies" of the time series of acoustic events in this domain.

关 键 词：Marble cyclic loading Acoustic emissions Kaiser's effect Pressure stimulated currents Criticality indices Natural time 

分 类 号：TD313[矿业工程—矿井建设]