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  • Articles  (19)
  • NDE  (19)
  • Springer  (19)
  • American Meteorological Society
  • American Physical Society (APS)
  • De Gruyter
  • International Union of Crystallography
  • Springer Nature
  • Wiley
  • 2000-2004
  • 1995-1999
  • 1980-1984  (19)
  • 1935-1939
  • 1930-1934
  • 2004
  • 2003
  • 2000
  • 1984  (19)
  • 1959
  • 1937
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  • 1935
  • Electrical Engineering, Measurement and Control Technology  (19)
  • Philosophy
  • Geosciences
  • Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Collection
  • Articles  (19)
Source
Keywords
Publisher
  • Springer  (19)
  • American Meteorological Society
  • American Physical Society (APS)
  • De Gruyter
  • International Union of Crystallography
    • +
Years
  • 2000-2004
  • 1995-1999
  • 1980-1984  (19)
  • 1935-1939
  • 1930-1934
Year
Topic
  • Electrical Engineering, Measurement and Control Technology  (19)
  • Philosophy
  • Geosciences
  • Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
  • Mathematics  (19)
  • 1
    Electronic Resource
    Electronic Resource
    Numerical modelling of the scattering of elastic waves in plates (1984)
    Springer
    Journal of nondestructive evaluation 4 (1984), S. 89-106 
    Details
    ISSN: 1573-4862
    Keywords: scattering ; elastic waves ; Lamb waves ; shear waves ; finite difference methods ; NDE
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Mathematics
    Notes: Abstract This paper describes the application of finite difference methods to the calculation of the scattering of elastic waves. The emphasis is on cracklike defects in plates, and it is shown that a common numerical technique can span a range of wavelengths from Lamb waves to ultrasonic waves with many reflections from the surfaces of the plate. Quantitative results are given for the scattering of Lamb waves and ultrasonic shear waves from surface-breaking cracks.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00566400
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  • 2
    Electronic Resource
    Electronic Resource
    Some computational considerations in eddy-current NDE (1984)
    Springer
    Journal of nondestructive evaluation 4 (1984), S. 39-42 
    Details
    ISSN: 1573-4862
    Keywords: Eddy current ; computer analysis ; numerical methods ; NDE
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Mathematics
    Notes: Abstract Theoretical calculations of eddy-current phenomena often involve the numerical evaluation of various integral expressions. A discussion of some of the possible evaluation methods and of the factors to be considered in choosing a method is presented.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00711099
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  • 3
    Electronic Resource
    Electronic Resource
    Ultrasonic reflection from a stressed interface (1984)
    Springer
    Journal of nondestructive evaluation 4 (1984), S. 3-12 
    Details
    ISSN: 1573-4862
    Keywords: Ultrasonic ; stress measurements ; interfacial stress ; NiTi ; NDE
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Mathematics
    Notes: Abstract In seeking to develop an NDE technique for verifying the serviceability of NiTi couplers for plumbing unions, it was found that the reflection coefficient for a normally incident ultrasonic wave correlated with the stress level at the NiTi-tubing interface. Current theory pertaining to interface reflection is not complete but, even at present status, there is semiquantitative accord between theoretical predictions and normalized data for reflection coefficient versus stress level. These results are at fixed frequency and with comparable surface roughness. Variation of either frequency or surface roughness further affects the reflection coefficient. Current studies are being pursued to define this effect.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00711095
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  • 4
    Electronic Resource
    Electronic Resource
    The radiographic edge scattering distortion (1984)
    Springer
    Journal of nondestructive evaluation 4 (1984), S. 75-88 
    Details
    ISSN: 1573-4862
    Keywords: object scattering ; edge scattering ; knife edge ; neutron radiography ; buildup factor ; NDE
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Mathematics
    Notes: Abstract Previously described scattering based edge distortions in optical density scans obtained from a neutron radiographic knife-edge image have been here confirmed using analog Monte Carlo simulation. In an attempt to estimate the effects of additional object scatter on such artifacts, the effect on the edge response of diffusely incident neutrons has been determined both empirically and by Monte Carlo simulation. The diffuse neutron incidence has been found to diminish the relative magnitude of the distortion, offering explanation for the infrequent observation of the corresponding edge scattering halo artifacts. The potential of this edge distortion as a diagnostic indicator of the buildup factor in radiography is suggested and examined.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00566399
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  • 5
    Electronic Resource
    Electronic Resource
    Separation and characterization of stress levels and texture in metal sheet and plate: I. Principles and preliminary experiment (1984)
    Springer
    Journal of nondestructive evaluation 4 (1984), S. 157-163 
    Details
    ISSN: 1573-4862
    Keywords: Residual Stress ; ultrasonics ; metals ; EMATs ; NDE
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Mathematics
    Notes: Abstract An approach is proposed for obtaining separate measures of stress anisotropy and texture in metal sheet or plate. The approach is based on the propagation characteristics ofSH n modes of ultrasonic waves. Experimental work has established that differences betweenSH 0 modes with orthogonal directions of propagation provide a measure of stress anisotropy that is insensitive to texture, with the restriction that the pseudosymmetry of the polycrystalline matrix of the sheet or plate is orthorhombic or higher. In the present work, it is argued that the differences between elastic constants associated with orthogonal directions of propagation of higher order modes should provide a meaningful measure of texture. The only requirement is that the texture be sufficiently well developed so that the following inequality is obeyed: ∣C′44−C′55∣〉0.002 $$\bar C$$ with $$\bar C$$ =1/2 (C′44+C′55). HereC′44 andC′55 are the effective shear moduli for planes normal to the sheet or plate surface and at right angles to each other. They are measurable by observing the differences between the phase velocities of theSH 0 and theSH n〉0 modes in the principal directions. By using Electromagnetic Acoustic Transducers (EMATs), the phase velocities can be deduced from the frequencies at which an SH mode of fixed wavelength is optimally excited. This approach has the advantage of being independent of specimen geometry and dimensions other than thickness.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00566221
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  • 6
    Electronic Resource
    Electronic Resource
    Application of ferromagnetic resonance probes to the characterization of flaws in metals (1984)
    Springer
    Journal of nondestructive evaluation 4 (1984), S. 51-58 
    Details
    ISSN: 1573-4862
    Keywords: eddy current testing ; magnetic particle testing ; magnetic sensor ; ferromagnetic resonance ; microwave frequency ; surface flaws ; NDE
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Mathematics
    Notes: Abstract This article presents some results obtained in the characterization of surface flaws by means of probes using ferromagnetic resonance of yttrium iron garnets (FMR probes). These experiments on artificial flaws show that FMR probes operate like eddy current probes for nonmagnetic materials and like magnetic field sensors for magnetic ones. Consequently, the working distance is larger for magnetic materials (1000–1500 µm) than for nonmagnetic ones (100–300 µm). FMR probes have good sensitivity to narrow flaws, good spatial discrimination, and are sensitive to flaw width and depth. Vector analysis allows the separation of distance and flaw effect by phase analysis on nonmagnetic materials. On magnetic materials this phase separation does not exist and another procedure is suggested. These results, and in particular those obtained on ferromagnetic materials, point to the possibility of replacing some eddy current or magnetic particle inspections by tests with ferromagnetic resonance probes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00566396
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  • 7
    Electronic Resource
    Electronic Resource
    Concrete crack depth meter using nonlinear ADC (1984)
    Springer
    Journal of nondestructive evaluation 4 (1984), S. 127-131 
    Details
    ISSN: 1573-4862
    Keywords: Concrete NDT ; NL-ADC ; crack depth measurement ; NDE
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Mathematics
    Notes: Abstract This paper introduces the design and construction of an electronic hybrid signal processing meter that develops an output voltage proportional to the depth of a concrete crack. The circuit employs multiplication, squaring, and square-rooting functions by means of a special nonlinear ADC and counting scheme.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00566217
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  • 8
    Electronic Resource
    Electronic Resource
    Transform techniques for analysis of thermal wave propagation in anisotropic composite materials (1984)
    Springer
    Journal of nondestructive evaluation 4 (1984), S. 149-155 
    Details
    ISSN: 1573-4862
    Keywords: NDE ; thermal waves ; anisotropy ; composites
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Mathematics
    Notes: Abstract A general formulation for solving the three-dimensional thermal diffusion equation in anisotropic media is presented. The method is based on two-dimensional Fourier transform techniques and can provide a physical insight into the problem. The analysis can easily be adapted to take into account arbitrary spatial variations of the excitation beam (i.e., a laser or an electron beam). Results obtained from propagation of thermal waves in composites are presented and followed by simulations for cases where the source function is defined. Propagation through an anisotropic slab is formulated and applied to specific cases.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00566220
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  • 9
    Electronic Resource
    Electronic Resource
    Analytical solution for impedance change due to flaws in eddy current testing (1984)
    Springer
    Journal of nondestructive evaluation 4 (1984), S. 197-202 
    Details
    ISSN: 1573-4862
    Keywords: Eddy current ; impedance ; flaw ; Green's function ; Born's limit ; NDE
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Mathematics
    Notes: Abstract Green's function is used in order to derive the analytical solution for the change in impedance due to a presence of the flaws in a conductor. This solution is applied to a cylindrical flaw and a spherical flaw whose radii are much smaller than the radius of the test coil. For both cases, the change in impedance is obtained within Born's limit.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00566224
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  • 10
    Electronic Resource
    Electronic Resource
    The interaction of ultrasound with contacting asperities: Applications to crack closure and fatigue crack growth (1984)
    Springer
    Journal of nondestructive evaluation 4 (1984), S. 203-212 
    Details
    ISSN: 1573-4862
    Keywords: Acoustic diffraction ; acoustic transmission ; asperity contact ; crack closure ; fatigue cracks ; mode conversion ; NDE ; stress intensity factor
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Mathematics
    Notes: Abstract The partial contact of two rough fatigue crack surfaces leads to transmission, reflection, diffraction, and mode conversion of an acoustic signal at those contacts. This paper reviews recent experimental and theoretical efforts to understand and quantify such contact on actual fatigue cracks in greater detail. It is shown that the size and density of individual contacts, or asperities, can be estimated from acoustic measurements. Furthermore, it is shown that this information is useful to provide the static stress across a partially closed crack as well as the “effective” stress intensity range which activates fatigue crack propagation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00566225
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