THE EFFECT OF LOADING HISTORY ON ACOUSTIC EMISSION IN ROCKS: AN APPLICATION TO THE DISCUSSION ABOUT THE MECHANISM OF RESERVOIR IMPOUNDING EARTHQUAKES

1991 ◽  
pp. 65-72
Author(s):  
Chen Yong ◽  
Yu Xiaohong ◽  
Dai Hengchang ◽  
Yan Hong
Keyword(s):  
Acoustic Emission ◽  
Loading History ◽  
Reservoir Impounding

scholarly journals Effect of Consolidation Degree on the Failure Generated Acoustic Emission Response of Discontinuous Glass Fibre Mat-Reinforced Polypropylenes

2001 ◽  
Vol 10 (5) ◽  
pp. 096369350101000 ◽  
Author(s):  
Gabor Romhany ◽  
Tibor Czigany ◽  
Oleg I. Benevolenski ◽  
Jozsef Karger-Kocsis
Keyword(s):  
Acoustic Emission ◽  
Failure Mode ◽  
Glass Fibre ◽  
Loading History ◽  
Failure Behaviour ◽  
Pull Out ◽  
Mode Versus ◽  
Consolidation Degree

The failure behaviour of partially and fully consolidated discontinuous glass fibre (GF) mat-reinforced thermoplastic polypropylene (GMT-PP) of various densities but with the same GF content was studied using the acoustic emission (AE) technique. The AE amplitude histograms were used to trace changes in the failure mode versus loading history and consolidation degree. AE amplitudes were clustered in three groups representing fibre debonding, pull-out and fracture events the occurrence of which was substantiated by fractografic inspection.

Propagation of acoustic emission signals in metallic fuselage structure

2001 ◽  
Vol 148 (4) ◽  
pp. 169-177 ◽  
Author(s):  
R.P. Dalton ◽  
P. Cawley ◽  
M.J. Lowe
Keyword(s):  
Acoustic Emission

Comparison of random field strengths in (1-x)SrTiO3-xBiFeO3 and (1-x)SrTiO3-xBaTiO3 relaxor ferroelectrics by means of acoustic emission

2020 ◽  
Vol 92 (2) ◽  
pp. 20401
Author(s):  
Evgeniy Dul'kin ◽  
Michael Roth
Keyword(s):  
Acoustic Emission ◽  
Random Field ◽  
Electric Fields ◽  
Bias Field ◽  
Relaxor Ferroelectrics ◽  
External Bias ◽  
Field Strengths

In relaxor (1-x)SrTiO3-xBiFeO3 ferroelectrics ceramics (x = 0.2, 0.3 and 0.4) both intermediate temperatures and Burns temperatures were successfully detected and their behavior were investigated in dependence on an external bias field using an acoustic emission. All these temperatures exhibit a non-trivial behavior, i.e. attain the minima at some threshold fields as a bias field enhances. It is established that the threshold fields decrease as x increases in (1-x)SrTiO3-xBiFeO3, as it previously observed in (1-x)SrTiO3-xBaTiO3 (E. Dul'kin, J. Zhai, M. Roth, Phys. Status Solidi B 252, 2079 (2015)). Based on the data of the threshold fields the mechanisms of arising of random electric fields are discussed and their strengths are compared in both these relaxor ferroelectrics.

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