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wave dispersion

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Series: ASM Handbook
Volume: 17
Publisher: ASM International
Published: 01 August 2018
DOI: 10.31399/asm.hb.v17.a0006475
EISBN: 978-1-62708-190-0
... for microwaves. It discusses the advantages and limitations of inspection with microwaves. The article discusses the physical principles, including reflection and refraction, absorption and dispersion, scattering, and standing waves. It provides a discussion on terahertz (THz) imaging for nondestructive...
Series: ASM Handbook
Volume: 8
Publisher: ASM International
Published: 01 January 2000
DOI: 10.31399/asm.hb.v08.a0003298
EISBN: 978-1-62708-176-4
... moderate strain level under constant, high-strain-rate loading. Some polymers exhibit no permanent plastic flow after substantial high rate straining, the strain recovery effect being time dependent. Stress-wave propagation through some polymers, such as polythene, is so dispersive that over...
Series: ASM Handbook
Volume: 8
Publisher: ASM International
Published: 01 January 2000
DOI: 10.31399/asm.hb.v08.a0003296
EISBN: 978-1-62708-176-4
... to the differences invoked when using a tensile Hopkinson bar in terms of loading technique, sample design, and stress-state stability, are discussed. high-strain-rate stress-strain response sample design stress-state stability split-Hopkinson pressure bar testing data reduction wave dispersion sample...
Series: ASM Handbook
Volume: 17
Publisher: ASM International
Published: 01 August 2018
DOI: 10.31399/asm.hb.v17.a0006461
EISBN: 978-1-62708-190-0
... distances is required ( Ref 6 ). Because the energy of Rayleigh waves is concentrated near the surface, these waves can propagate along large curvatures. Their velocity, however, is then defined by a frequency-radii criterion that describes dispersion, that is, a frequency-dependent velocity ( Ref 2...
Series: ASM Handbook
Volume: 17
Publisher: ASM International
Published: 01 August 2018
DOI: 10.31399/asm.hb.v17.a0006441
EISBN: 978-1-62708-190-0
... vary for different shapes and sizes of waveguide, and they have speeds that vary with frequency, sometimes dramatically. Figure 2 shows the speeds of guided waves that can propagate in a typical 150 mm (6 in.) diameter pipe. Fig. 2 Group velocity dispersion curves for guided waves in a 150 mm...
Series: ASM Handbook
Volume: 8
Publisher: ASM International
Published: 01 January 2000
DOI: 10.31399/asm.hb.v08.a0003300
EISBN: 978-1-62708-176-4
... lubrication, it cannot be completely eliminated. In torsional testing, friction does not exist. Wave Dispersion in the Bars In the compression Kolsky bar, the elastic waves that travel in the bars undergo geometric dispersion because different frequency components in the compressive pulse have...
Series: ASM Handbook
Volume: 17
Publisher: ASM International
Published: 01 August 2018
DOI: 10.31399/asm.hb.v17.a0006458
EISBN: 978-1-62708-190-0
... pulse that normally consists of slightly more cycles than there are periods in the MC. One main reason for defining this MC wavelength becomes apparent when dispersion curves and coupling to guided waves is subsequently introduced. Fig. 3 (a) Schematic diagram of a permanent magnet...
Series: ASM Handbook Archive
Volume: 10
Publisher: ASM International
Published: 01 January 1986
DOI: 10.31399/asm.hb.v10.a0001751
EISBN: 978-1-62708-178-8
... it appears in the spin wave dispersion relation: (Eq 10) є = D q 2 where D = 2(γ A ℏ/ M ). Application of Eq 9 provides a direct measure of A (or D ) for immediate comparison with data obtained by inelastic neutron scattering. The latter has the advantage of being conducted in zero...
Series: ASM Handbook
Volume: 21
Publisher: ASM International
Published: 01 January 2001
DOI: 10.31399/asm.hb.v21.a0003436
EISBN: 978-1-62708-195-5
...Abstract Abstract This article introduces the principal methodologies and some technologies that are being applied for nondestructive evaluation of composite materials. These include ultrasonic testing (UT), air-coupled UT, laser UT, ultrasonic spectroscopy, leaky lamb wave method, acousto...
Series: ASM Handbook
Volume: 17
Publisher: ASM International
Published: 01 August 2018
DOI: 10.31399/asm.hb.v17.a0006478
EISBN: 978-1-62708-190-0
..., matrix macrocracks, and voids in composite structures. The ultrasonic method itself uses longitudinal, shear, Lamb, Rayleigh, or guided waves for various measurements on composite materials. Wave parameters, including acoustic attenuation and speed, can be used to determine materials properties...
Series: ASM Handbook
Volume: 17
Publisher: ASM International
Published: 01 August 2018
DOI: 10.31399/asm.hb.v17.9781627081900
EISBN: 978-1-62708-190-0
Series: ASM Handbook
Volume: 8
Publisher: ASM International
Published: 01 January 2000
DOI: 10.31399/asm.hb.v08.a0003299
EISBN: 978-1-62708-176-4
... of the bar is comparable to the wavelength of the dominant frequency component (or when the period of the pulse is comparable to the transit time of the bar wave across the diameter of the bar), dispersion effects become extremely severe, and the use of surface measurements at distances farther away from...
Series: ASM Handbook
Volume: 10
Publisher: ASM International
Published: 15 December 2019
DOI: 10.31399/asm.hb.v10.a0006644
EISBN: 978-1-62708-213-6
..., reduces the total diffracted beam intensity. Fig. 34 Dispersion surface construction showing the tie points excited by an incident wave in (a) the Laue geometry, where one tie point in each branch (“A” on branch 1 and “B” on branch 2) is excited, and (b) the Bragg geometry, where two tie points...
Series: ASM Handbook
Volume: 8
Publisher: ASM International
Published: 01 January 2000
DOI: 10.31399/asm.hb.v08.a0003304
EISBN: 978-1-62708-176-4
... solution schemes under two-dimensional states of deformation. In-material stress measurements, with embedded manganin gages, are used to obtain axial and lateral stress histories. Stress decay, pulse duration, release structure, and wave dispersion are well defined in these plate and rod experiments...
Series: ASM Handbook
Volume: 17
Publisher: ASM International
Published: 01 August 2018
DOI: 10.31399/asm.hb.v17.a0006460
EISBN: 978-1-62708-190-0
... becomes on the order of the Rayleigh wavelength or less than it, dispersion effects of plate waves should be taken into account. When a line source is used, emission can be strongly enhanced by sweeping the laser line over the surface of the sample (for example, by reflecting the laser beam off of a fast...
Series: ASM Handbook
Volume: 9
Publisher: ASM International
Published: 01 December 2004
DOI: 10.31399/asm.hb.v09.a0009081
EISBN: 978-1-62708-177-1
... types of composite failure mechanisms such as thermoplastic-matrix composite failure mechanisms, untoughened thermoset-matrix composite failure mechanisms, toughened thermoset-matrix composite failure mechanisms, dispersed-phase and rubber-toughened thermoset-matrix composite failure mechanisms...
Series: ASM Handbook
Volume: 5
Publisher: ASM International
Published: 01 January 1994
DOI: 10.31399/asm.hb.v05.a0001295
EISBN: 978-1-62708-170-2
... and measured values. Differences between the results of an analysis and reality are more often due to an oversimplified model than to limitations in the capability of the measuring instrument. Basic Theory For general information on electromagnetic waves and optics, the reader should refer to textbooks...
Series: ASM Handbook
Volume: 12
Publisher: ASM International
Published: 01 January 1987
DOI: 10.31399/asm.hb.v12.9781627081818
EISBN: 978-1-62708-181-8
Series: ASM Handbook
Volume: 8
Publisher: ASM International
Published: 01 January 2000
DOI: 10.31399/asm.hb.v08.a0003295
EISBN: 978-1-62708-176-4
... of necking, which occurs in tension tests, and barreling, which occurs in compression tests, thus, do not occur in shear and torsion testing. Furthermore, due to the Poisson ratio effect, radial expansion or contraction of stress waves during the initial phase of axial high-speed tests is opposed by a radial...
Book Chapter

Series: ASM Desk Editions
Publisher: ASM International
Published: 01 December 1998
DOI: 10.31399/asm.hb.mhde2.a0003235
EISBN: 978-1-62708-199-3
...Abstract Abstract Microwaves (or radar waves) are a form of electromagnetic radiation with wavelengths between 1000 cm and 1 mm in free space. One of the first important uses of microwaves in nondestructive evaluation was for components such as waveguides, attenuators, cavities, antennas...