scholarly journals Passive monitoring of nonlinear relaxation of cracked polymer concrete samples using acoustic emission

2019 ◽  
Vol 146 (4) ◽  
pp. EL323-EL328 ◽  
Author(s):  
Xiaoyang Yu ◽  
Mourad Bentahar ◽  
Charfeddine Mechri ◽  
Silvio Montrésor
Keyword(s):  
Acoustic Emission ◽  
Polymer Concrete ◽  
Passive Monitoring ◽  
Nonlinear Relaxation

Acoustic Emission for Corrosion Detection

2006 ◽  
Vol 13-14 ◽  
pp. 231-236 ◽  
Author(s):  
P.T. Cole ◽  
J.R. Watson
Keyword(s):  
Acoustic Emission ◽  
Storage Tank ◽  
Crack Formation ◽  
Industrial Plant ◽  
Reinforced Concrete Structures ◽  
Passive Monitoring ◽  
Corrosion Detection ◽  
Process Plant ◽  
Acoustic Methods ◽  
Evaluation And Monitoring

Corrosion is the major cause of structural degradation in industrial plant and structures; the consequences of not identifying its presence and status can be severe, leading to a myriad of methods for its evaluation and monitoring. Amongst these there are a large number based on acoustic methods, and this paper concentrates on three variations involving passive monitoring with the aim of summarizing their usual area of applications and limitations. Passive monitoring involves listening to the process of corrosion itself, which usually causes acoustic emission as a result of the fracture and de-bonding of expansive corrosion products, localised yielding, or micro-crack formation. This method is applied to reinforced concrete structures, storage tank floors, and process plant whilst in service.

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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