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acoustic properties

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Series: ASM Handbook
Volume: 1A
Publisher: ASM International
Published: 31 August 2017
DOI: 10.31399/asm.hb.v01a.a0006324
EISBN: 978-1-62708-179-5
... Abstract This article discusses the influence of microstructure and chemical composition on the physical properties of cast iron. The physical properties include density, thermal expansion, thermal conductivity, specific heat, electrical conductivity, magnetic properties, and acoustic...
Book: Casting
Series: ASM Handbook
Volume: 15
Publisher: ASM International
Published: 01 December 2008
DOI: 10.31399/asm.hb.v15.a0005322
EISBN: 978-1-62708-187-0
... provides a detailed account on thermal properties, conductive properties, magnetic properties, and acoustic properties of cast iron. It also examines heat treatment, namely, stress relieving, annealing, normalizing, through hardening, and surface hardening. The article presents a discussion on the welding...
Series: ASM Handbook
Volume: 17
Publisher: ASM International
Published: 01 August 2018
DOI: 10.31399/asm.hb.v17.a0006470
EISBN: 978-1-62708-190-0
.... For example, ultrasonic waves are almost completely reflected at metal-gas interfaces. Partial reflection occurs at a metal-liquid interface or at an interface between a metal and another solid, with the specific percentage of reflected energy depending mainly on the ratios of certain acoustic properties...
Book Chapter

Series: ASM Desk Editions
Publisher: ASM International
Published: 01 December 1998
DOI: 10.31399/asm.hb.mhde2.a0003236
EISBN: 978-1-62708-199-3
... at a characteristic velocity that depends on the properties of that medium. Ultrasonic beams, like light beams, are reflected from surfaces and are refracted when they cross boundaries between two media that have different acoustic velocities. Depending on the mode of particle motion, ultrasonic waves are classified...
Series: ASM Handbook
Volume: 17
Publisher: ASM International
Published: 01 August 2018
DOI: 10.31399/asm.hb.v17.a0006466
EISBN: 978-1-62708-190-0
... of acoustic microscopy development, it was envisioned that the highest frequencies would dominate the applications. However, because of the high-attenuation properties of materials, the lower frequency range of 10 to 100 MHz is extensively used. Acoustic microscopy is recognized as a valuable tool...
Series: ASM Handbook
Volume: 17
Publisher: ASM International
Published: 01 August 2018
DOI: 10.31399/asm.hb.v17.a0006454
EISBN: 978-1-62708-190-0
... to the last. It is directly reported in microseconds. This signal feature depends on the source and also on the acoustic properties and reverberant nature of the specimen and sensor. Some source processes take a long time to complete, and this shows in the long durations of the AE signals that they produce...
Image
Published: 01 February 2024
Fig. 16 Comparison of quenching properties of aqueous polyalkylene glycol polymer quenchant (concentration 20% at 20 °C, or 70 °F) obtained at different acoustical frequencies. The top curve is the cooling-rate curve, and the lower two curves, A5 and A136, are the corresponding acoustical More
Series: ASM Handbook
Volume: 17
Publisher: ASM International
Published: 01 August 2018
DOI: 10.31399/asm.hb.v17.a0006446
EISBN: 978-1-62708-190-0
... frequencies allowed by the inherent attenuation of the material and external technical limitations of ultrasonic inspection. Therefore, linear acoustic material properties, such as velocity, attenuation, anisotropy, reflection, and scattering, are usually not sensitive enough to such microscopic material...
Series: ASM Handbook
Volume: 4F
Publisher: ASM International
Published: 01 February 2024
DOI: 10.31399/asm.hb.v4F.a0006999
EISBN: 978-1-62708-450-5
... Abstract This article discusses an experimental setup and a measuring setup for capturing acoustic emission during quenching. It presents the procedure for sound-emission measurement and an analysis of the acoustic spectrum obtained during quenching. acoustic emission quenching sound...
Series: ASM Handbook
Volume: 14B
Publisher: ASM International
Published: 01 January 2006
DOI: 10.31399/asm.hb.v14b.a0009152
EISBN: 978-1-62708-186-3
... emission signals is observed, which indicates tool breakage. Acoustic emission sensors can also be used to detect changes in friction properties, lubrication conditions, stick-slip phenomenon, and galling ( Ref 20 ). Fig. 16 Force and acoustic emission signals for a breaking punch. Source: Ref 2...
Series: ASM Handbook
Volume: 4B
Publisher: ASM International
Published: 30 September 2014
DOI: 10.31399/asm.hb.v04b.a0005935
EISBN: 978-1-62708-166-5
... Abstract This article focuses on the heat removal stages involved in quenching, and on the experimental setup used for measuring temperature and detecting sound signals with the help of illustrations and curves. The quenching process generates acoustic signals, which are the consequences...
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
... Abstract This article provides an overview of the characteristics of Rayleigh waves plus methods for generation and detection of waves, including using piezoelectric transducers or noncontact techniques such as lasers, electromagnetic acoustic transducers, or air-coupled ultrasonics. It reviews...
Series: ASM Handbook
Volume: 8
Publisher: ASM International
Published: 01 January 2000
DOI: 10.31399/asm.hb.v08.a0003315
EISBN: 978-1-62708-176-4
... material must possess appropriate high-temperature strength. The elastic properties of the material should be determined for the temperature of the desired test. Some properties of materials used for acoustic extension horns are presented in Table 2 . Typical 20 kHz resonance properties for acoustic...
Image
Published: 01 August 2018
Fig. 25 Scanning acoustic microscopy surface-mode image at 400 MHz of a manganese-zinc ferrite sample that was polished metallurgically but not chemically etched. The elastic property differences between the various phases of this material are responsible for the contrast shown in this image More
Series: ASM Handbook
Volume: 6A
Publisher: ASM International
Published: 31 October 2011
DOI: 10.31399/asm.hb.v06a.a0005578
EISBN: 978-1-62708-174-0
... in the acoustic, thermophysical, and thermomechanical properties between the alloys. This technique may prove useful for determining the phase balance of the weld region after welding and for predicting weld quality in situ. Control Over the past 50 years, friction welding machine tools have seen...
Image
Published: 01 August 2018
Fig. 15 (a) Data curve showing variation of acoustic pressure with distance ratio for a circular search unit. Distance ratio is the distance from the crystal face, d , divided by the length of the near field, N . (b) Image of a transducer pressure field, with Y 1 associated with distance More
Series: ASM Handbook
Volume: 17
Publisher: ASM International
Published: 01 August 2018
DOI: 10.31399/asm.hb.v17.a0006471
EISBN: 978-1-62708-190-0
..., although most applications still use frequencies below 1 MHz. Air-coupled Lamb waves are used in plate characterization and for measurement of the elastic and/or viscoelastic properties for mostly softer materials (lower acoustic impedance contrast). Items considered have included historic paintings...
Image
Published: 01 August 2018
-frequency (RF) magnetic field produced by a current through the MC is chosen to provide maximum transducer efficiency and is determined by the magnetic properties of the steel. The SH-wave propagation direction is parallel to the RF magnetic field produced by the MC. EMAT, electromagnetic acoustic More
Book Chapter

Series: ASM Desk Editions
Publisher: ASM International
Published: 01 December 1998
DOI: 10.31399/asm.hb.mhde2.a0003240
EISBN: 978-1-62708-199-3
... evaluation. It also discusses the types of acoustical holography, including liquid-surface acoustical holography and scanning acoustical holography. The article concludes by comparing liquid-surface and scanning systems. acoustical holography liquid-surface acoustical holography nondestructive...
Image
Published: 01 August 2018
Fig. 12 Magnetic field dependence of the amplitude of the first antisymmetric Lamb mode generated by a tangential field meander coil electromagnetic acoustic transducer in steel (a hot rolled iron plate). The solid broken line is a theoretical prediction based on the measured magnetostrictive More