&lt;title&gt;In-situ monitoring of acoustic linear and nonlinear behavior of titanium alloys during cycling loading&lt;/title&gt;

Frouin, J.; Matikas, Theodore E.; Na, Jeong K.; Sathish, Shamachary

doi:10.1117/12.339838

Cited by 24 publications

(14 citation statements)

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“…If the system itself has nonlinear behavior responding to an input signal, then the slope A 2 /A 1 2 would not be linear [37]. The results regarding the linearity of the experimental system used in this study are shown in Figure 8.…”

Section: Resultsmentioning

confidence: 93%

“…The nonlinearity parameter β was calculated based on the equalization A 2 = β 2 A 1 2 (for the second harmonic) as well as on A 3 = β 3 A 1 3 (for the third harmonic) [37,39,[45][46][47][48][49]. Based on the above acceptance, it is clear that the amplitude ratio, defamed as the nonlinearity parameter, A 2 /A 1 2 should have a single slope because other factors such as the length of the specimen and the ultrasonic frequency used remain constants throughout the experiment.…”

Section: Resultsmentioning

confidence: 99%

“…where α and δ are the expressions of the elastic constants for each term. It should be noted that the coefficient α is expressed in terms of second-order elastic constants only but δ is expressed in terms of both second-and third-order elastic constants [36,37]. Considering a perturbation solution to Equation (1) of the form u = u o + u' and by making appropriate substitutions, an approximated solution involving the second harmonic can be derived:…”

Section: Theoretical Backgroundmentioning

confidence: 99%

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Monitoring the Nonlinear Acoustic Behavior of Fresh Cementitious Materials during the Hardening Process Using Laser Doppler Vibrometry

et al. 2020

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A challenge in the field of material science and concrete technology is to associate material properties and behavior with changes in internal microstructure. A fundamental issue for planning, implementation, and quality control of construction projects is the fundamental understanding of the hardening process in freshly poured cement-based materials. Shortly after the mixing process, cementitious materials exhibit a substantial damping effect on ultrasonic wave propagation along with low-pulse velocity. The way a wave reflects and diffuses in the volume of a solid material can provide important information about internal heterogeneities. An important application of the wave propagation technique is the determination of layers within the material distinguished by unlike elastic properties. During the hardening process, the ultrasonic wave propagation exhibits a noticeable sensitivity at the point of phase change of the material, that is, the critical point at which the state of the suspension transforms from liquid to solid state. After that point, there is a continuous increase of pulse velocity and ultrasonic signal amplitude. The solidification point is of practical importance since at this point the load-bearing capacity of the composite material and its long-term behavior are based on the connectivity of the solid phase. This study aims to develop a nondestructive tool to monitor freshly poured cement-paste composites at early stages, during the hydration process, by means of nonlinear elastic waves. The measurement setup combined a contact ultrasonic transducer with a noncontact optical detection system, in which the principle of operation is based on the Doppler effect. This methodology enabled us to assess the amplitudes of harmonic vibrations of an acoustic wave propagating through the material with a specific fundamental frequency. This enabled the evaluation of important material properties, such as minute changes in the internal microstructure of fresh concrete during hardening, the evolution of nonlinearity parameters that relate to higher-order elastic constants of the material, as well as the ultrasonic wave velocity.

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Section: Resultsmentioning

confidence: 93%

Section: Resultsmentioning

confidence: 99%

Section: Theoretical Backgroundmentioning

confidence: 99%

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Monitoring the Nonlinear Acoustic Behavior of Fresh Cementitious Materials during the Hardening Process Using Laser Doppler Vibrometry

et al. 2020

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“…16 Even if all physical reasons are not well-known, most researchers agree that internal crack initiation is due to the very high number of fatigue cycles applied at a very low stress level. 19,20 Several authors have shown that acoustic measurements allow to monitor damage accumulation in fatigue specimens [21][22][23] . 19,20 Several authors have shown that acoustic measurements allow to monitor damage accumulation in fatigue specimens [21][22][23] .…”

Section: Introductionmentioning

confidence: 99%

“…17,18 As a matter of fact, internal crack initiation in the VHCF regime has been observed at lower loading frequencies (10-100 Hz). 19,20 Several authors have shown that acoustic measurements allow to monitor damage accumulation in fatigue specimens [21][22][23] . During ultrasonic fatigue tests, the piezoelectric converter produces the ultrasonic stationary wave, which generates the cyclic loading 19 .…”

Section: Introductionmentioning

confidence: 99%

In situ synchrotron ultrasonic fatigue testing device for 3D characterisation of internal crack initiation and growth

Messager

Junet

Palin‐Luc³

et al. 2019

Fatigue Fract Eng Mat Struct

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This work presents a new ultrasonic fatigue testing device for studying the initiation and propagation mechanisms of internal microstructurally short fatigue cracks using in situ synchrotron tomography. Its principle is described as well as the method used for automatically detecting crack initiation and its subsequent growth. To promote internal crack initiation, specimens containing internal casting defects were tested between the high cycle and very high cycle fatigue regimes (10 7 -10 9 cycles). Preliminary results show the ability of this new device to initiate an internal microstructurally short crack in a reasonable testing time and monitor its growth.

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Acoustics based assessment of a composite material under very high cycle fatigue loading

Venkat

Starke

Boller

2018

Fatigue of Materials at Very High Numbers of Loading Cycles

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<title>In-situ monitoring of acoustic linear and nonlinear behavior of titanium alloys during cycling loading</title>

Cited by 24 publications

References 0 publications

Monitoring the Nonlinear Acoustic Behavior of Fresh Cementitious Materials during the Hardening Process Using Laser Doppler Vibrometry

Monitoring the Nonlinear Acoustic Behavior of Fresh Cementitious Materials during the Hardening Process Using Laser Doppler Vibrometry

In situ synchrotron ultrasonic fatigue testing device for 3D characterisation of internal crack initiation and growth

Acoustics based assessment of a composite material under very high cycle fatigue loading

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