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Acoustic emission
About: Acoustic emission is a research topic. Over the lifetime, 16293 publications have been published within this topic receiving 211456 citations.
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TL;DR: In this article, the authors apply the theory of the superposition of infinitesimal deformations on finite deformations in an isotropic elastic material to the study of the propagation of a plane wave of small amplitude in an infinite body of the material which is subjected to a static, pure homogeneous deformation.
Abstract: In the present paper, we apply the theory [1] of the superposition of infinitesimal deformations on finite deformations in an isotropic elastic material to the study of the propagation of a plane wave of small amplitude in an infinite body of the material which is subjected to a static, pure homogeneous deformation. It is seen that the secular equation for the determination of the square of the velocity of propagation in a given direction has three real eigen-values and correspondingly three real mutually perpendicular eigen-directions. Provided these three eigen-values are all positive, travelling waves may be propagated in the body in the direction considered with linear polarisations along each of these eigen-directions. If one or more of the eigen-values is negative for any direction of propagation, the body is inherently unstable in the state of pure homogeneous deformation considered.
82 citations
26 Aug 2014-Materials Science and Engineering A-structural Materials Properties Microstructure and Processing
TL;DR: In this article, the effect of graphite for improving the properties of Al6061-TiB2 composite using the high-energy stir casting method was investigated with X-ray diffraction, energy dispersive spectrum and scanning electron microscope.
Abstract: The present work includes the effect of addition of graphite for improving the properties of Al6061–TiB2 composite using the high-energy stir casting method. The characterization was performed with X-ray diffraction, energy dispersive spectrum and scanning electron microscope. The thermal and mechanical behaviors such as thermo gravimetric analysis/differential thermal analysis, hardness, tensile strength using acoustic emission and fatigue behaviors were investigated. The composite of composition Al6061–20% TiB2 with 2% graphite shows the greatest improvement in mechanical behavior. An Acoustic Emission system was employed in all the tests to monitor the acoustic energy release during the whole deformation process and some useful conclusions were drawn.
82 citations
TL;DR: In this article, the correlation between stress and acoustic emission (AE) data was calculated using fractal theory methods and Grassberger-Procaccia (G-P) algorithms to evaluate the damage and degree of flaw in coal and rock materials under multilevel dynamic loading (MDL).
82 citations
TL;DR: In this paper, acoustic emission (AE) parameters are analyzed for five levels of damage, which are formation of hair line crack, visible crack in UHPC overlay, yielding of main bars and finally crushing of composite beams.
82 citations
TL;DR: In this article, uniaxial compression tests were conducted on the composite samples of coal and oil shale characterised by high strength and low elastic modulus, and their fracturing and failure propagation processes were monitored by an acoustic emission (AE) device and a digital video camera.
82 citations