Scribd
Upload
75 views1 page

Acoustic Emission

Acoustic emission is the phenomenon of elastic waves radiating in solids due to irreversible internal structural changes, such as crack formation or plastic deformation from aging, temperature gradients, or external forces. These structural changes rapidly release localized elastic energy, generating small surface displacements and elastic waves that can be detected. Acoustic emission is commonly used in structural health monitoring to detect, locate, and characterize damage by analyzing the transient elastic waves released within materials. The major applications of acoustic emission techniques are source location, evaluating material performance, and health monitoring of structures.

Uploaded by

Alzaki Abdullah
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as DOC, PDF, TXT or read online on Scribd
75 views1 page

Acoustic Emission

Acoustic emission is the phenomenon of elastic waves radiating in solids due to irreversible internal structural changes, such as crack formation or plastic deformation from aging, temperature gradients, or external forces. These structural changes rapidly release localized elastic energy, generating small surface displacements and elastic waves that can be detected. Acoustic emission is commonly used in structural health monitoring to detect, locate, and characterize damage by analyzing the transient elastic waves released within materials. The major applications of acoustic emission techniques are source location, evaluating material performance, and health monitoring of structures.

Uploaded by

Alzaki Abdullah
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as DOC, PDF, TXT or read online on Scribd
You are on page 1/ 1

Acoustic emission

Acoustic emission (AE) is the phenomenon of radiation of acoustic (elastic) waves in


solids that occurs when a material undergoes irreversible changes in its internal
structure, for example as a result of crack formation or plastic deformation due to
aging, temperature gradients or external mechanical forces. In particular, AE is
occurring during the processes of mechanical loading of materials and structures
accompanied by structural changes that generate local sources of elastic waves.

This results in small surface displacements of a material produced by elastic or stress


waves generated when the accumulated elastic energy in a material or on its surface is
released rapidly. The waves generated by sources of AE are of practical interest in the
field of structural health monitoring (SHM), quality control, system feedback, process
monitoring and others. In SHM applications, AE is typically used to detect, locate and
characterise damage.

AE is commonly defined as transient elastic waves within a material, caused by the


rapid release of localized stress energy. Hence, an event source is the phenomenon
which releases elastic energy into the material, which then propagates as an elastic
wave. Acoustic emissions can be detected in frequency ranges under 1 kHz, and have
been reported at frequencies up to 100 MHz, but most of the released energy is within
the 1 kHz to 1 MHz range. Rapid stress-releasing events generate a spectrum of stress
waves starting at 0 Hz, and typically falling off at several MHz

The three major applications of AE techniques are:

1) Source location - determine the locations where an event source occurred

2) Material mechanical performance - evaluate and characterize materials/structures


and

3) Health monitoring - monitor the safety operation of a structure, i.e. bridges,


pressure containers, and pipe lines, etc.

You might also like