Results 331 to 340 of about 302,242 (373)
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An Introduction to Acoustic Emission
1972A brief introduction to the field of acoustic emission is presented. The basic mechanisms of acoustic emission and a brief historical survey of the technology, along with some of its application to materials research and structural evaluation programs, are discussed.
C.A. Tatro, D.O. Harris, R.G. Liptai
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Acoustic emission for the 1990s
IEEE 1991 Ultrasonics Symposium, 2002An overview of recent results which provide new directions for acoustic emission (AE) technology during this decade is given. The 1990s will see new quantitative acoustic emission test methods develop as new technology takes advantage of progress in understanding AE practice. New aspects of AE described herein include different theoretical perspectives,
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Acoustic emission and microcrack correlation
Philosophical Magazine B, 1998Abstract One peculiarity of acoustic emission (AE) is the scale invariance of some characteristic statistical quantities, which suggests that similar critical dynamics could rule the elastic relaxation process in different circumstances. In the present paper, after reporting some findings from recent experiments.
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Acoustic emission properties of callus
Medical & Biological Engineering & Computing, 198111 New Zealand white rabbits with 45 degree midshaft oblique osteotomies were stressed in shear while monitoring acoustic emission events. The ringdown counting method demonstrated a reasonably reproducible pattern when counting events against load; that is, each fracture remained essentially quiet until over 50% of load to failure had been applied ...
Berg E, Nicholls Pj, Nicholls Pj
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The Journal of the Acoustical Society of America, 1992
An acoustic emission waveguide (10) for holding a test sample (29) in a hostile environment and guiding ultrasonic waves to a transducer (34) disposed in a non-hostile environment. The waveguide (10) includes a flattened test sample attachment end (15) having a flat bar clamp (22) to hold test specimens (29) thereto.
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An acoustic emission waveguide (10) for holding a test sample (29) in a hostile environment and guiding ultrasonic waves to a transducer (34) disposed in a non-hostile environment. The waveguide (10) includes a flattened test sample attachment end (15) having a flat bar clamp (22) to hold test specimens (29) thereto.
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2002
The quantity “acoustic emission” can only be defined in a qualitative way. An excellent formal definition can be found in [Miller and Mclntire 1987]: “Acoustic emission is the class of phenomena where transient elastic waves are generated by the rapid release of energy from localized sources within a material, or the transient waves so generated ...
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The quantity “acoustic emission” can only be defined in a qualitative way. An excellent formal definition can be found in [Miller and Mclntire 1987]: “Acoustic emission is the class of phenomena where transient elastic waves are generated by the rapid release of energy from localized sources within a material, or the transient waves so generated ...
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A cochlear model for acoustic emissions
The Journal of the Acoustical Society of America, 1988Variability in cochlear emission properties among different species, particularly humans and small mammals, and within individuals in the same species, is modeled by a cochlear nonlinear transmission line. The difference between humans and animals is largely explained by a lower cochlear input impedance in human ears than in cats, gerbils, or ...
M. Lapid, Miriam Furst
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2008
Wood, like many heterogeneous materials, provides many interesting AE challenges. It is a biological material that has evolved to perform many functions. It is anisotropic, and it is heterogeneous over a very wide range of length scales. It is hydroscopic, and its mechanical properties are extremely sensitive to moisture content.
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Wood, like many heterogeneous materials, provides many interesting AE challenges. It is a biological material that has evolved to perform many functions. It is anisotropic, and it is heterogeneous over a very wide range of length scales. It is hydroscopic, and its mechanical properties are extremely sensitive to moisture content.
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The Journal of the Acoustical Society of America, 1986
Acoustic emission monitoring is a non-destructive testing technique that ects ultra-high frequency sound that stressed metal emits. In straightening a gun tube the workpiece is at first under no stress, is elastically deformed (with total springback when pressure is released), is plastically deformed (with some springback upon release of pressure), or
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Acoustic emission monitoring is a non-destructive testing technique that ects ultra-high frequency sound that stressed metal emits. In straightening a gun tube the workpiece is at first under no stress, is elastically deformed (with total springback when pressure is released), is plastically deformed (with some springback upon release of pressure), or
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The Journal of the Acoustical Society of America, 1997
The invention relates to an acoustic emission transducer and a coupling method. The acoustic emission transducer (1) forms an assembly unit and is intended specially for measuring high-frequency acoustic emissions (up to about 2 MHz). It consists of a piezoelectric measuring element (9), an acoustic transmission base (8) with a circumferential coupling
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The invention relates to an acoustic emission transducer and a coupling method. The acoustic emission transducer (1) forms an assembly unit and is intended specially for measuring high-frequency acoustic emissions (up to about 2 MHz). It consists of a piezoelectric measuring element (9), an acoustic transmission base (8) with a circumferential coupling
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