Journal ArticleDOI
Nonlinear self-modulation and subharmonic acoustic spectroscopy for damage detection and location
TLDR
In this article, a self-modulation mode of nonlinear acoustic vibrations of cracked defects has been analyzed and observed experimentally and attributed to the sum-frequency type resonance in a multi-degree of freedom system and include a subharmonic spectrum as a particular case.Abstract:
A self-modulation mode of nonlinear acoustic vibrations of cracked defects has been analyzed and observed experimentally. Spectral patterns of the self-modulation are attributed to the sum-frequency type resonance in a multi-degree-of-freedom system and include a subharmonic spectrum as a particular case. Both the subharmonic and self-modulation modes demonstrate a high localization around the defect and provide opportunities for early detection and recognition of damaged areas.read more
Citations
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Journal ArticleDOI
Damage characterization in plates using singularity of scale mode shapes
TL;DR: In this paper, a scale fractal complexity spectrum is created to reveal mode shape singularities by eliminating noise and interference, which can indicate the abnormality of the mode shape, clearly indicating damage.
Journal ArticleDOI
Nonequilibrium phenomena in damaged media and their effects on the elastic properties
TL;DR: Experimental results indicating that nonlinearity of damaged concrete is memory-dependent will be presented and the implications of such findings in the development of physical models, with relevant outcomes for the characterization of hysteretical features, will be discussed.
DissertationDOI
Frequenzkonversion aufgrund nichtlinearer akustischer Phänomene: Grundlagen und Anwendung zur defektselektiven zerstörungsfreien Prüfung
TL;DR: In this paper, Hoherharmonischer et al. present a nichtlineare Verhalten von Kontaktstellen in Defekten (Ermudungsbruche, Delaminationen, Impacts, etc.) fuhrt bei einer sinusformigen Anregung des Prufobjektes zu einer pulsartigen Veranderung der KontAKtsteifigkeit.
Journal ArticleDOI
Combined Photoacoustic–Acoustic Technique for Crack Imaging
TL;DR: In this article, a nonlinear imaging of a crack by combination of a common photoacoustic imaging technique with additional acoustic loading has been performed, and different physical mechanisms of the nonlinearity contributing to the contrast in linear and nonlinear photoacoustical imaging of the crack are discussed.
Proceedings ArticleDOI
Non-destructive testing techniques based on nonlinear methods for assessment of debonding in single lap joints
TL;DR: In this paper, the nonlinear content of the structural response of a single lap joint subjected to ultrasonic harmonic excitation is both numerically and experimentally evaluated to identify and characterize the defects within the bonded region.
References
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BookDOI
Review of Progress in Quantitative Nondestructive Evaluation
TL;DR: The Review of Progress in Quantitative NDE (ROPQN) as mentioned in this paper is the world's leading conference in reporting annually new research and development results in quantitative NDE and promotes communication between the research and engineering communities and emphasize current reporting of work in progress.
Journal ArticleDOI
Ultrasonics of non-linear contacts: propagation, reflection and NDE-applications
TL;DR: The results of experimental investigation of acoustic non-linear phenomena on contact boundaries are presented in this article, where simulation experiments demonstrated a threshold nonlinear distortion due to "clapping" and "kissing" mechanisms, multiple bifurcations and chaos development for contact vibrations.
Journal ArticleDOI
Instability, chaos, and "memory" in acoustic-wave-crack interaction.
Igor Yu. Solodov,B. A. Korshak +1 more
TL;DR: A new class of nonlinear acoustic phenomena has been observed for acoustic wave interactions with cracked defects in solids, and acoustic-wave impact on a crack is shown to exhibit amplitude hysteresis and storage for parametric and non linear acoustic effects.
Journal ArticleDOI
Sensitive imaging of an elastic nonlinear wave-scattering source in a solid
TL;DR: In this paper, the nonlinear response of a solid by modulation of a high by a low-frequency wave, and employing moving-window, synchronous detection is used to locate isolated nonlinear scattering source(s) in solids.
Journal ArticleDOI
Self-induced hysteresis for nonlinear acoustic waves in cracked material.
TL;DR: The proposed theoretical models attribute the phenomenon to hysteresis in transition of the acoustically forced oscillation of cracks from a nonclapping regime to a regime of clapping contacts.