Observation of two stage dislocation dynamics from nonlinear ultrasonic response during the plastic deformation of AA7175-T7351 aluminum alloy

Rao, V.V. Bapeswara; Kannan, Elankumaran; Prakash, Raghu V.; Balasubramaniam, Krishnan

doi:10.1016/j.msea.2009.01.029

Cited by 43 publications

(19 citation statements)

References 20 publications

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“…Results showed an increase in β, where the increase was much greater in the initial stages of applied stress in monotonic loading. Rao et al [141] measured β in Al-7175 samples that were deformed under strain-controlled tensile tests, and compared results to X-ray diffraction measurements. Results showed that β was location-dependent along the gauge length.…”

Section: Fatigue-and Dislocation-based Monitoringmentioning

confidence: 99%

Review of Second Harmonic Generation Measurement Techniques for Material State Determination in Metals

et al. 2014

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This paper presents a comprehensive review of the current state of knowledge of second harmonic generation (SHG) measurements, a subset of nonlinear ultrasonic nondestructive evaluation techniques. These SHG techniques exploit the material nonlinearity of metals in order to measure the acoustic nonlinearity parameter, β. In these measurements, a second harmonic wave is generated from a propagating monochromatic elastic wave, due to the anharmonicity of the crystal lattice, as well as the presence of microstructural features such as dislocations and precipitates. This article provides a summary of models that relate the different microstructural contributions to β, and provides details of the different SHG measurement and analysis techniques available, focusing on longitudinal and Rayleigh wave methods. The main focus of this paper is a critical review of the literature that utilizes these SHG methods for the nondestructive evaluation of plasticity, fatigue, thermal aging, creep, and radiation damage in metals.

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Section: Fatigue-and Dislocation-based Monitoringmentioning

confidence: 99%

Review of Second Harmonic Generation Measurement Techniques for Material State Determination in Metals

et al. 2014

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“…It is also reported that the existence of fundamental relationship between the material plasticity and nonlinear ultrasonic parameter is independent of wave type. Recently, Rao et al (2009) reported that formation of dislocation cellular structure during the tensile deformation of AA7175-T7351 aluminum alloy has a significant influence on the nonlinear behavior of the material. However, attempts to apply the NLU technique to nondestructively evaluate mechanical properties are scarce.…”

Section: Introductionmentioning

confidence: 99%

Nondestructive assessment of tensile properties of cold worked AISI type 304 stainless steel using nonlinear ultrasonic technique

Viswanath

Rao

Mahadevan

et al. 2011

Journal of Materials Processing Technology

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“…To overcome this technical limitation, various nonlinear ultrasonic techniques have been proposed. Nonlinearity in an ultrasonic signal is sensitive to clapping of closed fatigue cracks, micro-plastic deformations, and dislocations [ 5 ]. Typical approaches for observing nonlinear ultrasonic characteristics can be classified into three groups: (i) Super-harmonic, (ii) sub-harmonic, and (iii) mixed-frequency methods.…”

Section: Introductionmentioning

confidence: 99%

Self-Sensing Nonlinear Ultrasonic Fatigue Crack Detection under Temperature Variation †

Kim

Jang

2018

Sensors

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This paper proposes a self-sensing nonlinear ultrasonic technique for fatigue crack detection under temperature variations. Fatigue cracks are identified from linear (α) and nonlinear (β) ultrasonic parameters recorded by a self-sensing piezoelectric transducer (PZT). The self-sensing PZT scheme minimizes the data acquisition system’s inherent nonlinearity, which often prevents the identification of fatigue cracks. Also, temperature-dependent false alarms are prevented based on the different behaviors of α and β. The proposed technique was numerically pre-validated with finite element method simulations to confirm the trends of α and β with changing temperature, and then was experimentally validated using an aluminum plate with an artificially induced fatigue crack. These validation tests reveal that fatigue cracks can be detected successfully in realistic conditions of unpredictable temperature and that positive false alarms of 0.12% occur.

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Observation of two stage dislocation dynamics from nonlinear ultrasonic response during the plastic deformation of AA7175-T7351 aluminum alloy

Cited by 43 publications

References 20 publications

Review of Second Harmonic Generation Measurement Techniques for Material State Determination in Metals

Review of Second Harmonic Generation Measurement Techniques for Material State Determination in Metals

Nondestructive assessment of tensile properties of cold worked AISI type 304 stainless steel using nonlinear ultrasonic technique

Self-Sensing Nonlinear Ultrasonic Fatigue Crack Detection under Temperature Variation †

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