scholarly journals Acoustic Emission

2021 ◽  
pp. 175-217
Author(s):  
Dimitrios G. Aggelis ◽  
Markus G. R. Sause ◽  
Pawel Packo ◽  
Rhys Pullin ◽  
Steve Grigg ◽  
...  
Keyword(s):  
Acoustic Emission ◽  
Health Monitoring ◽  
Crack Nucleation ◽  
Irreversible Processes ◽  
Destructive Testing ◽  
Research And Practice ◽  
Non Invasive ◽  
Recent Trends ◽  
Non Destructive

AbstractAcoustic emission (AE) is one of the most promising methods for structural health monitoring (SHM) of materials and structures. Because of its passive and non-invasive nature, it can be used during the operation of a structure and supply information that cannot be collected in real time through other techniques. It is based on the recording and study of the elastic waves that are excited by irreversible processes, such as crack nucleation and propagation. These signals are sensed by transducers and are transformed into electric waveforms that offer information on the location and the type of the source. This chapter intends to present the basic principles, the equipment, and the recent trends and applications in aeronautics, highlighting the role of AE in modern non-destructive testing and SHM. The literature in the field is vast; therefore, although the included references provide an idea of the basics and the contemporary interest and level of research and practice, they are just a fraction of the total possible list of worthy studies published in the recent years.

Study of Initial Stages of Fatigue Process Using Non-Destructive Testing Methods

2013 ◽  
Vol 592-593 ◽  
pp. 553-556
Author(s):  
František Vlasic ◽  
Josef Volák ◽  
Libor Nohál ◽  
Pavel Mazal ◽  
Filip Hort
Keyword(s):  
Acoustic Emission ◽  
Crack Nucleation ◽  
Electrical Potential ◽  
Fatigue Loading ◽  
Non Destructive Testing ◽  
Testing Methods ◽  
Destructive Testing ◽  
Fatigue Process ◽  
Cyclic Damage ◽  
Non Destructive

This paper deals with the basic research of cyclic damage during the initial stages of fatigue process using the non-destructive testing methods. The acoustic emission method was used for monitoring of the microstructure changes during fatigue loading. The electrical potential measurements of specimen and microscopic observation were used mainly to detect the first short cracks and their propagation. The fatigue tests at room temperature were conducted on titanium alloy and creep-resistant steel specimens under bending and tension loading. The aim of the study was to compare the acoustic emission signal at different types of loading until fracture and to analyze in detail the signal changes in initial stages of fatigue process. This analysis was primarily based on the waveform similarity and division into classes. The results show the high sensitivity of the acoustic emission technology in the transition from the stage of surface relief evolution to the stage of crack nucleation and propagation.

scholarly journals The experimental comparison of parameters signals of acoustic emission during destructive test on composites based on cement

2018 ◽  
Vol 219 ◽  
pp. 03005
Author(s):  
Michaela Hoduláková ◽  
Dalibor Kocáb ◽  
Libor Topolář ◽  
Barbara Kucharczyková
Keyword(s):  
Acoustic Emission ◽  
Experimental Comparison ◽  
Non Destructive Testing ◽  
Material Behaviour ◽  
Destructive Testing ◽  
Testing Technique ◽  
Fine Grained ◽  
Non Invasive ◽  
Strength Tests ◽  
Non Destructive

The paper reports the analysis of acoustic emission signals captured during compressive strength tests of fine-grained cement-based composites of various composition. Acoustic emission monitoring belongs to a non-invasive and passive non-destructive testing technique. It is one of the most sensitive experimental techniques to monitor cracking of materials. While the acoustic emission phenomenon is directly associated with nucleation of cracks in materials based on cement, the measurement of these kinds of materials is readily applied to detect cracking activity. An understanding of microstructure–performance relationships is the key to true understanding of material behaviour.

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