Download or read book On the Nature of Acoustic Emission and Its Application to the Study of Deformation Mechanisms in Metals written by Jack Peter Toronchuk and published by . This book was released on 1974 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Acoustic Emission Under Applied Stress written by B. H. Schofield and published by . This book was released on 1963 with total page 38 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report concerns specific investigation undertaken to assess the role of the surface oxide layer in the generation of acoustic pulses in metals, i.e., acoustic emission. Experiments were conducted on single crystals of aluminum of different crystallographic orientation. The specimens were pulled in tension both in atmosphere and exposed to etchant solutions. Results demonstrated the oxide layer is not itself an emission source and that the emission characteristics are significantly modified as a result of the influence of the oxide on the deformation behavior of the specimens. Specific observations suggest the operative mechanism of emission generation and the importance of the role played by the surface condition in the deformation of metals.
Download or read book Acoustic Emission Produced by Deformation of Metals and Alloys written by C. R. Heiple and published by . This book was released on 1987 with total page 88 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Acoustic Emission written by Thomas F. Drouillard and published by Springer. This book was released on 1979-03 with total page 814 pages. Available in PDF, EPUB and Kindle. Book excerpt: The purpose of this bibliography is to list all of the known literature on acoustic emission in a single volume. The bibliography is intended to serve as a reference to the literature for those interested in the acoustic emission phenomenon, for those engaged in materials research, and for those interested in applying acoustic emission as a nonde structive testing method. It provides an invaluable reference to source materiaf for both undergraduate and graduate students interested in the subjects of acoustic emission, microseismic activity, and nondestructive testing. In addition, it provides a vaIuable desk-top reference for engineers and scientists in the fields of pressure vessel design and maintenance, stress analysis, mechanical engineering, welding engineering, nuclear engineering, metallurgy, and quality control. In compiling the bibliography every effort was made to search the literat ure for all the publications and obtain copies, index them, and publish a complete, com prehensive bibliography of the literature on acoustic emission. This bibliography is the most complete ever published. It includes essentially all of the literature on acoustic emission that has ever been published up through the first quarter of 1977. Publications listed are in the form of technical reports and memoranda, journal articles, technical presentations, proceedings, doctoral, master, and bachelor theses, patents, bound volumes, translations, and newspaper articles. Some references, however, are not technical articles, but consist of editorials or staff-written journal articles which are included because they represent apart of the literature.
Download or read book ACOUSTIC EMISSION UNDER APPLIED STRESS written by and published by . This book was released on 1961 with total page 1 pages. Available in PDF, EPUB and Kindle. Book excerpt: A series of tests were conducted on aluminum single crystals of the so-called 0.5 orientation. The data obtained to date were studied relative to the physical behavior of the 0.5 specimens and also with regard to that previously obtained on (100) specimens. Various characteristics are presented of the emission and the physical parameters. Again, the data shows a very definite correlation between the emission phenomenon and deformation behavior. It is clear from the information obtained up through the present, that the emission is a consequence of, and is produced by, a particular phenomenological characteristic of the deformation prosess. Several observations were undertaken to determine the particular aspect of the deformation process acting as the source of this emission energy. (Author).
Download or read book AN ACOUSTIC EMISSION STUDY OF THE DEFORMATION MECHANISMS OF POLYCRYSTALLINE ALUMINUM AND COPPER written by Robert Charles Bill and published by . This book was released on 1970 with total page 163 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Relationship of Acoustic Emission and Ultrasonic Velocity to Deformation Mechanisms and Dilatancy During the Ductile Deformation of Marble written by Theodore Allen Koelsch and published by . This book was released on 1979 with total page 248 pages. Available in PDF, EPUB and Kindle. Book excerpt: The purpose of the present study is to investigate in some detail the relationship of macroscopic deformation to the microscopic mechanisms. Of particular concern is the relative importance and possible interrelationship of cataclastic and plastic events. The nature of acoustic emissions is such that their use promises to provide a useful tool for monitoring internal deformation behavior. The nature of emissions generated by cataclastic and non-cataclastic mechanisms will be examined, first to determine if they are distinguishable, then to correlate them with source mechanisms. The probable nature of the mechanism giving rise to the emissions will be determined by the simultaneous measurements of linear stress-strain, dilatancy, and axial compressional wave velocity during deformation as a function of confining pressure and grain size. The acoustic emissions will be examined by means of frequency spectrum analysis as well. The correlations will be substantiated by direct thin section observations ... Samples with three different grain sizes were used, in order to elucidate the grain size effects on the deformational behavior. The samples were deformed in triaxial tests under various confining pressures, in the range of 50 to 200 MPa.
Download or read book Use of Acoustic Emission in Nondestructive Testing written by Julian Ross Frederick and published by . This book was released on 1972 with total page 92 pages. Available in PDF, EPUB and Kindle. Book excerpt: A model based on the activation of dislocation sources was developed for predicting the effect of microstructure on acoustic emission. The model predicts a minimum dislocation source length and slip distance below which no emission will be detected. Experimental results obtained on various metals and alloys having different microstructures substantiate the model. The effect of grain size on the acoustic emission from 99.99% aluminum and 99.9% copper suggests that macroscopic yielding in these metals occurs with the help of dislocation pile-ups that have been held up by grain boundaries and that the emission results from the activation of dislocation sources near the grain boundaries. Experimental results obtained under conditions of very low background noise level show that some metals produce acoustic emission when the applied load is removed. The amount of emission that is observed correlates with the magnitude of the Bauschinger effect in the metal. In those metals that show an 'unload' acoustic emission effect there is the possibility of using it to investigate the magnitude of the residual stress in a specimen. Creep and fatigue phenomena can also be studied by the use of acoustic emission. (Author Modified Abstract).
Download or read book Acoustic Emission written by Zinoviy Nazarchuk and published by Springer. This book was released on 2017-01-23 with total page 294 pages. Available in PDF, EPUB and Kindle. Book excerpt: This monograph analyses in detail the physical aspects of the elastic waves radiation during deformation or fracture of materials. It presents the methodological bases for the practical use of acoustic emission device, and describes the results of theoretical and experimental researches of evaluation of the crack growth resistance of materials, selection of the useful AE signals. The efficiency of this methodology is shown through the diagnostics of various-purpose industrial objects. The authors obtain results of experimental researches with the help of the new methods and facilities.
Download or read book Magnetoelastic Acoustic Emission written by Valentyn Skalskyi and published by Springer Nature. This book was released on 2024-01-17 with total page 356 pages. Available in PDF, EPUB and Kindle. Book excerpt: The book presents theoretical and experimental studies to establish the relationship between volume jumps of the 90° domain wall in a ferromagnetic material and the magnitude of the half-space surface displacement caused by it. A method of evaluating the influence of the external magnetic field on the stress intensity factor at the tip of the crack-like defects in ferromagnets is discussed. The influence of hydrogen on the generation of magneto-elastic acoustic emission signals of ferromagnets is described. The features of magneto-elastic acoustic emission due to the presence of plastic deformation, structural changes, and volumetric damage in such structural materials are shown.
Download or read book Nuclear Science Abstracts written by and published by . This book was released on 1974 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
- Author : J. T. Glass
- Publisher :
- Release : 1981
- ISBN :
- Pages : 60 pages
Acoustic Emission Determination of Deformation Mechanisms Leading to Failure of Naval Alloys Phase I
Download or read book Acoustic Emission Determination of Deformation Mechanisms Leading to Failure of Naval Alloys Phase I written by J. T. Glass and published by . This book was released on 1981 with total page 60 pages. Available in PDF, EPUB and Kindle. Book excerpt: The purpose of the present research is to use innovative optical techniques and superior signal capture and processing systems to determine the waveforms, frequency spectra, and propagational behavior of the acoustic emission signals generated by the various mechanical deformation mechanisms leading to failure of metal alloys of prime importance to naval structures. The ultimate goal of this research is to absolutely determine the degree to which precise characterization of the acoustic emission signals can serve to remotely assess the severity of mechanical damage and give early warning of impending failure. Experiments were performed using a modified piezoelectric transducer, a Fizeau type interferometer, and a modified Michelson interferometer. Acoustic emission events were generated by pulling microtensile specimens in an extremely quiet microtensile machine and by the brittle, step unloading fracture of glass capillary tubes on the surface of test specimens possessing different geometries. All acoustic emission event waveforms were recorded by a high speed transient recorder and stored on magnetic mini-diskettes for analysis on a high speed digital computer and for future propagational behavior and waveform analysis. Specimens which were pulled on the microtensile machine were examined under optical and scanning electron microscopes to determine a point by point correlation between acoustic emission events and microstructural changes.
Download or read book Use of Acoustic Emission to Study Deformation of Mild Steel in Hydrogen and Nitrogen Environments written by John C. Fanning and published by . This book was released on 1987 with total page 124 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Acoustic Emission Generated by Dislocation Mechanisms During the Deformation of Metals written by and published by . This book was released on 1978 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Acoustic emission is a transient elastic wave generated by the rapid release of energy within a material. A wide variety of mechanisms have been proposed as possible sources of acoustic emission. Proposed mechanisms have included crack propagation, precipitate fracture, twin formation, martensite formation, dislocation motion and/or multiplication. This paper is concerned with acoustic emission generated by dislocation mechanisms operating during plastic deformation. Twinning and martensitic phase transformations are excluded even though dislocation motion is involved in the nucleation and growth of twins and the growth of martensite.
Download or read book An Investigation of the Effects of Metallurgical And or Testing Variables on the Acoustic Emission from Crystalline Materials written by Steve H. Carpenter and published by . This book was released on 1982 with total page 79 pages. Available in PDF, EPUB and Kindle. Book excerpt: The goal of this investigation was to characterize and correlate the acoustic emission measured during deformation with the responsible deformation mechanisms. Two separate and distinct classes of materials have been investigated. The materials were chosen for the important fundamental information they could provide concerning the relationship between acoustic emission and the parameters involved and because of their practical importance to Air Force programs and objectives. The materials investigated were: one, a selection of precipitation strengthened metals and alloys, and two, a selection of metals and alloys having a hexagonal close packed structure. For both classes of materials the acoustic emission has measured during deformation for different metallurgical and testing parameters. The data have been analyzed and models and/or deformation mechanisms responsible for the measured emission have been identified.
Download or read book Proceedings of the International Conference on Information Engineering Management and Security 2015 written by Vignesh Ramakrishnan and published by Association of Scientists, Developers and Faculties (ASDF). This book was released on 2015-08-13 with total page 359 pages. Available in PDF, EPUB and Kindle. Book excerpt: ICIEMS 2015 is the conference aim is to provide a platform for researchers, engineers, academicians as well as industrial professionals from all over the world to present their research results and development activities in Engineering Technology, Industrial Engineering, Application Level Security and Management Science. This conference provides opportunities for the delegates to exchange new ideas and application experiences face to face, to establish business or research relations and to find global partners for future collaboration.
