Fatigue damage assessment by nonlinear ultrasonic materials characterization

Nagy, Péter B.

doi:10.1016/s0041-624x(97)00040-1

Cited by 419 publications

(239 citation statements)

References 13 publications

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“…However, it has been reported that these linear parameters (wave velocity and attenuation) of ultrasonic waves are not sufficiently enough to evaluate microdamages induced by creep and fatigue. 18,19) In addition, the nonlinearity of damaged materials exceeds significantly by the orders of magnitude high-order than the intrinsic nonlinearity of the intact materials and the higher-order elastic constants change by orders of magnitude during deformation. Therefore, the variation in high-order elastic properties is very attractive to investigate material degradation.…”

Section: Ultrasonic Nonlinearitymentioning

confidence: 99%

Creep Characterization in Advanced Heat-Resistant Steel Using Ultrasonic Nonlinearity Technique

Kim

2012

Mater. Trans.

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The creep of heat-resistant steel (12Cr3.45W alloy) is experimentally characterized to estimate damages using a nonlinear ultrasonic technique. The finite amplitude method has been used to measure the ultrasonic nonlinearity parameter in all creep damaged specimens by through transmitted longitudinal wave. The microstructure showed significant changes in precipitate size and dislocation density during creep. The normalized ultrasonic nonlinearity decreases significantly in stage I and decreases monotonously in stage II and stage III. However, the ultrasonic nonlinearity increase due to the formation of creep voids in the vicinity of the creep failure region. The correlation between the microstructural changes and ultrasonic nonlinearity is discussed.

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Section: Ultrasonic Nonlinearitymentioning

confidence: 99%

Creep Characterization in Advanced Heat-Resistant Steel Using Ultrasonic Nonlinearity Technique

Kim

2012

Mater. Trans.

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“…Since then, a number of researchers, e.g., [10][11][12][13][14], have pursued the use of nonlinear ultrasound as a tool for nondestructive material characterization. In recent years, there has been a resurgence of interest in nonlinear ultrasonic methods [15][16][17][18][19][20][21][22][23][24][25][26][27][28][29].…”

Section: Introductionmentioning

confidence: 99%

A micromechanics model for the acoustic nonlinearity parameter in solids with distributed microcracks

Zhao

Qiu

Jacobs³

et al. 2016

AIP Conference Proceedings

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A non-collinear mixing technique to measure the acoustic nonlinearity parameter of an adhesive bond from one side of the sample AIP Conference Proceedings 1806, 020011 (2017) Corresponding author: now with Tufts University, jianmin.qu@tufts.eduAbstract. As a longitudinal wave propagates through a linearly elastic solid with distributed cracks, the solid is subjected to cyclic tension and compression. During the tensile cycles, a crack might be open and its faces are traction-free. During the compressive cycles, a crack might be closed and its faces are in contact. Such contact may also be frictional because of crack face roughness. Such tension and compression asymmetry causes acoustic nonlinearity. This paper develops a micromechanics model that relates the crack density to the acoustic nonlinearity parameter. The model is based on a micromechanics homogenization of the cracked solid under dynamic loading. It is shown that the acoustic nonlinearity parameter is proportional to the crack density. Furthermore, the acoustic nonlinearity parameter also depends on the frequency of the wave motion, and the coefficient of friction of the crack faces. Unlike the second harmonic generated by dislocations, the amplitude of the second harmonic due to crack face contact is proportional to the amplitude of the fundamental frequency. To validate the micromechanics model, the finite element method is used to simulate wave propagation in solid with randomly distributed microcracks. The micromechanics model predictions agree well with the finite element simulation results.

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“…However, although nonlinear ultrasonic measurement has been a subject of considerable interest, most of the researches were about the nonlinear bulk and surface waves [9][10][11]. There is rarely investigation of nonlinear SH guided waves in plate-like structure.…”

Section: Introductionmentioning

confidence: 99%

Third Harmonic Generation of Shear Horizontal Guided Waves Propagation in Plate-like Structures

Li¹,

Xu²,

Cho³

2016

Journal of the Korean Society for Nondestructive Testing

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The use of nonlinear ultrasonics wave has been accepted as a promising tool for monitoring material states related to microstructural changes, as it has improved sensitivity compared to conventional non-destructive testing approaches. In this paper, third harmonic generation of shear horizontal guided waves propagating in an isotropic plate is investigated using the perturbation method and modal analysis approach. An experimental procedure is proposed to detect the third harmonics of shear horizontal guided waves by electromagnetic transducers. The strongly nonlinear response of shear horizontal guided waves is measured. The accumulative growth of relative acoustic nonlinear response with an increase of propagation distance is detected in this investigation. The experimental results agree with the theoretical prediction, and thus providing another indication of the feasibility of using higher harmonic generation of electromagnetic shear horizontal guided waves for material characterization. are not as easy as other guided wave modes for the reason that the particle displacements of SH

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Fatigue damage assessment by nonlinear ultrasonic materials characterization

Cited by 419 publications

References 13 publications

Creep Characterization in Advanced Heat-Resistant Steel Using Ultrasonic Nonlinearity Technique

Creep Characterization in Advanced Heat-Resistant Steel Using Ultrasonic Nonlinearity Technique

A micromechanics model for the acoustic nonlinearity parameter in solids with distributed microcracks

Third Harmonic Generation of Shear Horizontal Guided Waves Propagation in Plate-like Structures

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