Location

Williamsburg, VA

Start Date

1-1-1986 12:00 AM

Description

Acoustic emission refers to the ultrasonic signals (elastic waves) emitted by materials undergoing microscopic changes of stress state. This naturally generated ultrasound is distinctly related to the source process (dislocation motion, fracture, and some phase changes). For example, the waveform of an acoustic emission from a crack propagation increment contains information about the location, growth distance, velocity, and orientation of the crack. Acoustic emission then is of interest as a naturally occurring phenomenon for the characterization of deformation and fracture mechanisms. It is also of interest as a possible passive monitoring technique for detecting, locating, and characterizing defects in structures. The current state-of-the-art of these applications is reviewed here in the context of an emerging science base, and future trends discussed.

Book Title

Review of Progress in Quantitative Nondestructive Evaluation

Volume

5A

Chapter

Chapter 1: Conventional Methodologies

Section

Other

Pages

271-293

DOI

10.1007/978-1-4615-7763-8_29

Language

en

File Format

application/pdf

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Jan 1st, 12:00 AM

Acoustic Emission: Nature's Ultrasound

Williamsburg, VA

Acoustic emission refers to the ultrasonic signals (elastic waves) emitted by materials undergoing microscopic changes of stress state. This naturally generated ultrasound is distinctly related to the source process (dislocation motion, fracture, and some phase changes). For example, the waveform of an acoustic emission from a crack propagation increment contains information about the location, growth distance, velocity, and orientation of the crack. Acoustic emission then is of interest as a naturally occurring phenomenon for the characterization of deformation and fracture mechanisms. It is also of interest as a possible passive monitoring technique for detecting, locating, and characterizing defects in structures. The current state-of-the-art of these applications is reviewed here in the context of an emerging science base, and future trends discussed.