Journal ArticleDOI
The dependence of acoustic emission on strain rate in 7075-T6 aluminum: The aim of this experimental investigation was to determine the effect of strain rate on the acoustic emission from a polycrystalline metal
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The dependence of RMS acoustic-emission output on strain rate was determined during tensile tests on 7075-T6 aluminum over a range of strain rates from 0.015 min−1 to 0.230 min− 1 as mentioned in this paper.Abstract:
The dependence of RMS acoustic-emission output on strain rate was determined during tensile tests on 7075-T6 aluminum over a range of strain rates from 0.015 min−1 to 0.230 min−1. A special normalization technique was developed to eliminate the inherent differences in the acoustic emission from supposedly identical specimens tested under identical conditions. It was found that the RMS acoustic-emission output increases approximately linearly with strain rate, and that the slope of the linear dependence decreased with increased plastic strain. The effect of pinned dislocation breakaway on the acoustic-emission output vs. plastic-strain relationship is the subject of a preliminary theory.read more
Citations
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The origin of acoustic emission during deformation of aluminium and an aluminium–magnesium alloy
TL;DR: In this article, the acoustic emission power during deformation of pure aluminium single crystals and polycrystals, and specimens of A1 1·3wt% Mg, has been measured.
Journal ArticleDOI
Tool condition monitoring in metal cutting: A neural network approach
TL;DR: The application of supervised and unsupervised neural network paradigms to pattern recognition of sensor signal features supports the premise that, despite excellent classification accuracy by both networks, the unsuper supervised system holds greater promise in a real world setting.
Journal ArticleDOI
A study of acoustic emission generated during orthogonal metal cutting—1: Energy analysis
Sabbir Rangwala,David Dornfeld +1 more
TL;DR: In this article, the authors studied the dependence of the acoustic emission signal energy on orthogonal machining variables such as cutting velocity, uncut chip thickness and the chip-tool contact length.
Journal ArticleDOI
The measurement and significance of energy in acoustic-emission testing
D. O. Harris,R. L. Bell +1 more
TL;DR: In this paper, a technique for measuring the energy sensed at an acoustic-emission transducer that utilizes a squaring circuit and digital integrator was presented, and the theoretical relationship between energy and other more conventional acoustic emission parameters, such as counts and RMS voltage, were derived for certain idealized cases.
Journal ArticleDOI
Strain‐rate dependence of acoustic‐emission power and spectra in aluminum alloys
TL;DR: In this paper, the authors investigated the dependence of acoustic emission power and spectra for deformation of aluminum alloys over a wide frequency range of 100 kHz to 4 MHz, and found that acoustic emissions were proportional to the first power of the plastic strain rate times the gauge length of the specimen.
References
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Journal ArticleDOI
Fracture analysis by use of acoustic emission.
TL;DR: In this paper, the authors present results of acoustic emission studies on flawed and unflawed specimens of aluminum and beryllium and show that acoustic emission from the flawed specimens is found to begin at stress levels far below the general yield stress.
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Relationship between Acoustic Emission and Dislocation Kinetics in Crystalline Solids
TL;DR: In this article, sounds emitted from single crystals of irradiated LiF, annealed LiF and NaCl during constant-strain-rate compressive deformation were recorded and analyzed, and it was suggested that some 105−106 segments of dislocation line were involved in a cumulative fashion due to the stimulating effect of the moving acoustic wave on bowed dislocation segments.
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Phonon Viscosity and Its Effect on Acoustic Wave Attenuation and Dislocation Motion
TL;DR: In this paper, it was shown that good agreement with available measurements is obtained if the dislocations are damped by phonon viscosity, which contributes directly to the acoustic attenuation and indirectly produces a damping for dislocation motion.
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Microplasticity detected by an acoustic technique
R. M. Fisher,J. S. Lally +1 more
TL;DR: In this paper, an apparatus was built to detect the formation of small slip events within a crystal by monitoring small longitudinal oscillations of the test specimen which occur when the load is momentarily relaxed.