Nonlinear Scattering by a Partially Closed Surface Breaking Crack

Poznić, Milan; Pecorari, Claudio

doi:10.1063/1.1916658

Cited by 3 publications

(2 citation statements)

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“…α and β are the incident angle and scattered direction as given in figure 1. f n represents the harmonic frequency component, i.e., f 1 represents fundamental excitation frequency, while f 2 and f 3 represents second and third higher harmonic frequencies, respectively. For instance, if the incident wave frequency is at 100 kHz, then C S0−A0 (30,150,200) represents the second harmonic frequency (200 kHz) scattering coefficient of mode converted A0 waves in 150°direction resulted from an oblique 30°S0 incident wave; C A0−SHS0 (0, 180, 300) designates the scattering coefficient of mode converted fundamental symmetric shear horizontal mode (SHS0) at the third harmonic in 180°d irection due to the 0°incident A0 mode incidence at the damage. Details about the definition and derivation of WDICs can be found in [44,45].…”

Section: Small-size Lisa Model For Guided Wave Scattering Analysismentioning

confidence: 99%

“…To fully capture the 3D nonlinear dynamics, FEM for contact-impact problems has been widely investigated, maturing over the years [28]. The nonlinear scattering of bulk waves from closed cracks has been investigated, such as the time domain boundary integral equation given by Hirose and the nonlinear spring analytical model given by Poznic and Pecorari [29,30]. A recent contribution is from Blanloeuil et al using FEM and extended analytical approach [31,32].…”

Section: Introductionmentioning

confidence: 99%

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Nonlinear features of guided wave scattering from rivet hole nucleated fatigue cracks considering the rough contact surface condition

Shen

Wang

2018

Smart Mater. Struct.

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This article presents the investigation of nonlinear scattering features of guided waves from rivet hole nucleated fatigue cracks considering the rough contact surface condition. A small-size numerical model based on the local interaction simulation approach is developed, enabling the efficient analysis of the contact acoustic nonlinearity during the wave crack interactions. The study starts with an idealized breathing crack model possessing smooth, perfectly kissing contact surfaces. Then, the nature of rough crack surfaces is considered with randomly distributed initial openings and closures. Several distinctive aspects of the nonlinear scattering phenomenon are discussed: (1) the amplitude effect, which renders significantly different nonlinear response under various levels of excitation wave amplitudes; (2) the directivity and mode conversion features, which addresses the scattering direction dependence of the fundamental and superharmonic wave mode components; (3) the nonlinear resonance phenomenon, which maximizes the nonlinear response during the wave crack interactions at certain excitation frequency ranges. This study demonstrates that these nonlinear features are substantially influenced by the crack surface condition and differ much between an idealized breathing crack and a rough crack in most practical cases. Fatigue tests on a thin aluminum plate with a rivet hole is conducted to induce cracks in the specimen. An active sensor array surrounding the crack zone is implemented to generate and receive ultrasonic guided waves in various directions. Current work emphasizes on using a highly efficient numerical model to explain the nonlinear features of scattered waves from fatigue cracks considering the rough crack surface condition. These special features may provide insights and guidelines for nonlinear guided wave based nondestructive evaluation and structural health monitoring system design. The paper finishes with discussion, concluding remarks, and suggestions for future work.

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Section: Small-size Lisa Model For Guided Wave Scattering Analysismentioning

confidence: 99%