Nonlinear Laser Ultrasonic Measurements of Localized Fatigue Damage

Blackshire, James L.; Sathish, Shamachary; Na, J.; Frouin, J.

doi:10.1063/1.1570305

Cited by 15 publications

(15 citation statements)

References 10 publications

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“…Exceptions are the work of Deng et al [5] who observe cumulative second harmonic generation of Lamb-wave propagation and the research of Barnard et al [6] and Blackshire et al [7] who are considering Rayleigh surface waves. Exceptions are the work of Deng et al [5] who observe cumulative second harmonic generation of Lamb-wave propagation and the research of Barnard et al [6] and Blackshire et al [7] who are considering Rayleigh surface waves.…”

Section: Introductionmentioning

confidence: 99%

Generation and Detection of Higher Harmonics in Rayleigh Waves Using Laser Ultrasound

Herrmann¹,

Jacobs²,

Qu³

et al. 2006

AIP Conference Proceedings

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Articles you may be interested inOptical excitation of narrowband Rayleigh surface waves for second harmonic generation AIP Conf. Proc. 1511, 375 (2013); 10.1063/1.4789072Interaction of guided wave modes in isotropic weakly nonlinear elastic plates: Higher harmonic generation Experimental characterization of fatigue damage in a nickel-base superalloy using nonlinear ultrasonic waves ABSTRACT. This research studies higher harmonics of Rayleigh surface waves propagating in nickel base superalloys. Rayleigh waves are used because they carry most of the energy and travel along the surface of a specimen where fatigue damage is typically initiated. The energy concentration near the free surface leads to stronger nonlinear effects compared to bulk waves. An ultrasonic piezoelectric transducer together with a plastic wedge is used for the experimental generation of the Rayleigh wave. The detection system consists of a laser heterodyne interferometer. Measurements are performed to detect the fundamental wave as well as the second harmonic. The amplitude ratio is related to the nonlinearity parameter β which is typically used to describe changes in microstructure and investigate fatigue damage.

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Section: Introductionmentioning

confidence: 99%

Generation and Detection of Higher Harmonics in Rayleigh Waves Using Laser Ultrasound

Herrmann¹,

Jacobs²,

Qu³

et al. 2006

AIP Conference Proceedings

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show abstract

“…Cantrell은 수직 투과 종파 를 이용하여 재료 내부의 전위와 초음파 비선형 파라미터와의 관계를 연구하였다 [4][5][6]. 그리고 Blackshire는 피로에 의한 재료의 표면손상을 평가 하기 위하여 표면파의 음향 비선형 특성을 이용 하였다 [7]. 하지만 이러한 기법들은 접촉식 탐촉자 를 이용한 전통적인 방식으로써, 피검사체에 탐촉 자 접근을 위한 환경과 접촉매질에 의한 오차 등 은 기술의 적용성 측면에서 많은 제한이 있다.…”

Section: 서 론unclassified

Assessment of Plastic Deformation in Al6061 Alloy using Acoustic Nonlinearity of Laser-Generated Surface Wave

Kim¹,

Nam²,

Choi³

et al. 2012

Journal of the Korean Society for Nondestructive Testing

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The objective of this study is to assess plastic deformation in aluminium alloy by acoustic nonlinearity of laser-generated surface waves. A line-arrayed laser beam made by high-power pulsed laser and mask slits is utilized to generate the narrowband surface wave and the frequency characteristics of laser-generated surface waves are controlled by varying the slit opening width and slit interval of mask slits. Various degrees of tensile deformation were induced by interrupting the tensile tests so as to obtain aluminum specimens with different degrees of plastic deformation. The experimental results show that the acoustic nonlinear parameter of a laser-generated surface wave increased with the level of tensile deformation and it has a good correlation with the results of micro-Vickers hardness test and electron backscatter diffraction (EBSD) test. Consequently, acoustic nonlinearity of laser-generated surface wave could be potential to characterize plastic deformation of aluminum alloy.

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“…In-service nondestructive evaluation (NDE) is an effective and practical method for detecting and assessing material degradations [6][7][8][9][10]. The most extensively used method in NDE is ultrasonic testing, which is effective because it has high mobility and high feasibility with a relatively simple instrumentation and uncomplicated configuration [6,7,10,11].…”

Section: Introductionmentioning

confidence: 99%

Nondestructive Evaluation of Thermal Aging in Al6061 Alloy by Measuring Acoustic Nonlinearity of Laser-Generated Surface Acoustic Waves

Jun

Seo

Jhang

2019

Metals

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The structures in high-temperature environments are prone to undergo hardening and embrittlement as a result of thermal aging; this can cause variations in their mechanical properties. Because these changes occur at the microstructural level, it is difficult to evaluate them through linear ultrasonic techniques. In this work, a surface acoustic wave (SAW) was used to measure and compare the acoustic nonlinearity and mechanical properties of Al6061 alloys heat-treated at 220 °C for different durations (0 min, 20 min, 40 min, 1 h, 2 h, 10 h, 100 h, 1000 h). The SAW was generated by a pulsed laser and then received by an interferometer. Moreover, the yield strength, ultimate strength, and elongation to failure were measured by tensile tests. The results demonstrate that the critical variations in the mechanical properties can be detected by monitoring the variation features in the acoustic nonlinearity. Transmission electron microscopy images were captured to observe the microstructural changes, which shows that the acoustic nonlinearity varied according to the change in the precipitation phase. This supports the acoustic nonlinearity measurement using the laser-generated SAW being an effective technique for the fully noncontact nondestructive evaluation of material degradations as well as changes in mechanical properties.

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Nonlinear Laser Ultrasonic Measurements of Localized Fatigue Damage

Cited by 15 publications

References 10 publications

Generation and Detection of Higher Harmonics in Rayleigh Waves Using Laser Ultrasound

Generation and Detection of Higher Harmonics in Rayleigh Waves Using Laser Ultrasound

Assessment of Plastic Deformation in Al6061 Alloy using Acoustic Nonlinearity of Laser-Generated Surface Wave

Nondestructive Evaluation of Thermal Aging in Al6061 Alloy by Measuring Acoustic Nonlinearity of Laser-Generated Surface Acoustic Waves

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