Topic
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: Theoretical relationships have been drawn between acoustic emission (AE) and the metal cutting process parameters by relating the energy content of the AE signal to the plastic work of deformation which generates the emission signals as mentioned in this paper.
Abstract: Theoretical relationships have been drawn between acoustic emission (AE) and the metal cutting process parameters by relating the energy content of the AE signal to the plastic work of deformation which generates the emission signals The RMS value of the emission signal is expressed in terms of the basic cutting parameters Results are presented for 6061-T6 aluminum and SAE 1018 steel over the range of speeds 252 to 372 sfm (0128 to 19 m/s) and rake angles 10 to 40 deg Good correlation has been found between predicted and experimental signal energy levels In addition, AE generation from chip contact along the tool face is studied and the AE energy level reflects the existence of chip sticking and sliding on the tool face, and indicates the feasibility of utilizing AE in tool wear sensing
155 citations
TL;DR: In this paper, an experimental method was developed for detecting flexural waves in plates by the use of piezoelectric films, and the recorded signals were analyzed by a wavelet transform to determine arrival times of waves at different frequencies.
154 citations
TL;DR: In this article, the authors investigated the effect of water content on quasi-static fracture behavior of sandstone and found that both the fracture toughness and crack propagation velocity observably decreased with the increase of water contents.
154 citations
TL;DR: In this article, a column covering method is proposed to analyze the fractal property of the spatial distribution of acoustic emissions during the rock damage and failure process, which is consistent with the theoretical analysis.
154 citations
TL;DR: In this article, an electrical resistance cartridge heater, placed in a central vertical borehole, was used to cycle the sample to progressively higher peak temperatures between 75°C and 175°C.
Abstract: Concurrent ultrasonic tomography and acoustic emission monitoring were employed to study thermally induced microfracturing in an unconfined, 15-cm cube of Lac du Bonnet granite from Atomic Energy of Canada Limited's Underground Research Laboratory. An electrical resistance cartridge heater, placed in a central vertical borehole, was used to cycle the sample to progressively higher peak temperatures between 75°C and 175°C. Tomography data were collected, at room temperature, before and after each thermal cycle. Acoustic emission monitoring proceeded during both heating and cooling phases of each thermal cycle. Microfractures opened above 80°C and eventually coalesced into a macroscopic fracture plane. The macroscopic fracture originated at the outer edges of the sample and then extended inward, parallel to the fast velocity direction, and eventually intersected the borehole. Both acoustic emission locations and slowness difference tomography clearly delineated the fracture plane. We attribute the development of the macroscopic fracture to a thermal gradient cracking mechanism acting upon a brittle, anisotropic medium.
154 citations