| Diagnosing Malfunctions in Transformers by Acoustic Emission |
SEP 91 |
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| Authors:
Gordon L. Schneider; allen t. green
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 | Acoustic emission is used to detect and prevent catastropic failure of instrument transformers. (NTIAC/gta). |
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| Acousto-Ultrasonic Measurement of Internal Bond Strength in Composite Wood Products |
MAY 91 |
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| Authors:
John M. Rodgers; allen t. green; Stephen W. Borup
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| The acousto-ultrasonic method is extremely useful in studying the effects of defects in various materials. Acousto-ultrasonic measurement parameters are generally correlated with the material's mechanical properties, such as the ultimate tensile and shear strength. This article describes an on- line application of acousto-ultrasonics to examine bond integrity. (G.P. Singh). |
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| CORRELATION OF INTERNAL BOND STRENGTH OF PARTICLEBOARD WITH ACOUSTO ULTRASONICS |
JUN 89 |
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| Authors:
allen t. green
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| utilizing a nondestructive test we have been able to develop an on- line, internal bond strength measurement of particle board. internal bond strength typically has been obtained through a destructive physical test procedure on specimens taken from a sampling of boards. this paper describes the nondestructive technique used to obtain the correlation between internal bond strength and acousto-ultrasonic readings. (author) |
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| EVALUATION OF COMPOSITE STRUCTURES BY STRESS-WAVE-FACTOR AND ACOUSTIC EMISSION |
81 |
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| Authors:
allen t. green
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| the development of acoustic emission and stress-wave-factor methods for the evaluation of composite materials and structures is discussed. reference to existing work and on-going programs shows the direction for the use of both methods. acoustic emission measurements rely on the self-originating signals created during deformation whilst the stress-wave-factor method utilizes an externally stimulated impulse and properties within the material which perturb the signal. promising results are shown for both methods. ... |
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| acoustic emission nde for advanced composite structures |
DEC 79 |
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| Authors:
allen t. green; robert j. landy
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| this paper presents a brief review of acoustic emission and its application to the nondestructive evaluation of composite structures. considering that only fifty of two thousand references on ae refer to composite materials, one might ask why is ae of importance? we hope to answer this question by describing some of the practical applications currently in use and also some of the research uses of ae in composite structures. a ... |
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| acoustic emission technology 1979 |
AUG 79 |
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| Authors:
allen t. green
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| this is a brief survey article of the applications of acoustic emission. included is a discussion of work concerned with the acoustic emission signals generated in ferromagnetic materials when the level of an applied field is varied. (ntiac) |
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| acoustic emission for ndt of adhesive-bonded structures |
79 |
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| Authors:
allen t. green
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| acoustic emission methods have been significantly advanced during the past fifteen years, and now appear to be a possible source of evaluating adhesively-bonded structures. while much work remains to be accomplished, that which has been conducted to date shows strong promise. first, as a means of nondestructively assessing efficiency of new adhesive bonding materials and then through application to structural geometries, ae methods may find suitable use from laboratory studies ... |
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| ACOUSTIC EMISSION FLAW DETECTION IN TURBINE COMPRESSOR BLADES |
OCT 77 |
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| Authors:
allen t. green; Richard Fricker; Donald B. Weir
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| failures in operational aircraft turbine blades have been attributed to alpha case cracks, forging laps, and cracks propagating from leading edge damage. a current inspection for leading edge crack detection in installed blades is to rub the edge with the thumb(nail). this method gives no assurance that cracks which do not grossly disrupt the smooth leading edge contour will be detected. therefore, the entire body of the blade (other than ... |
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| Acoustic Emission Testing for Structural Applications. |
MAR 1976 |
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| Authors:
Kanji Ono; allen t. green; CALIFORNIA UNIV LOS ANGELES DEPT OF MATERIALS
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| General introduction of acoustic emission testing is given. While little practical experience has been accumulated in many applications involving civil engineering structures, the potential of this technique in structural integrity assessment has been well demonstrated in aerospace and nuclear fields. Further developmental efforts should aid in realizing the full benefit of this method. (Author) |
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