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Mutual Nonlinear Interaction of Ultrasonic Guided Waves in Plate with Applications for NDE.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Mutual Nonlinear Interaction of Ultrasonic Guided Waves in Plate with Applications for NDE./
作者:	Hasanian, Mostafa.
出版者:	Ann Arbor : ProQuest Dissertations & Theses, : 2019,
面頁冊數:	153 p.
附註:	Source: Dissertations Abstracts International, Volume: 80-12, Section: B.
Contained By:	Dissertations Abstracts International80-12B.
標題:	Applied physics. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=13917912
ISBN:	9781392318454

Mutual Nonlinear Interaction of Ultrasonic Guided Waves in Plate with Applications for NDE.
Hasanian, Mostafa.

Mutual Nonlinear Interaction of Ultrasonic Guided Waves in Plate with Applications for NDE. - Ann Arbor : ProQuest Dissertations & Theses, 2019 - 153 p.

Source: Dissertations Abstracts International, Volume: 80-12, Section: B.

Thesis (Ph.D.)--The Pennsylvania State University, 2019.

Ultrasonic methods have an essential role in Nondestructive Evaluation (NDE) and Structural Health Monitoring (SHM) of infrastructure. Early damage in the structure can be diagnosed in microstructural scales whereas conventional NDE methods are less effective. The unique sensitivity of nonlinear ultrasonic waves to microstructural damage has intrigued scholars to search for how to fulfill its potential to prognose early damage in materials. The distorted ultrasonic wave packet, due to the material's nonlinearity, can generate higher harmonics that are associated with incipient damage. The primary benefit of guided waves is that, relative to bulk waves, they can propagate long distances and interrogate inaccessible domains. However, the complex phenomenon of nonlinear guided waves makes the study more difficult. Ultrasonic higher order harmonics are generated due to the interaction of ultrasonic waves in the nonlinear material. Second order harmonics due to self-interactions are often corrupted by electronic nonlinearities. This has complicated the measurement of second harmonics associated with the material's nonlinearity. The mutual interaction of ultrasonic waves generates sum and difference frequencies that are separated from higher harmonics generated by instrumentation. This significant characteristic of mutual interactions is incredibly helpful for the evaluation of microstructure since material nonlinearities are distinguishable from instrumentation nonlinearities. This dissertation is dedicated to the development of the mutual interactions of guided waves in a plate.The general theory of nonlinear guided wave mixing in plate is developed in this dissertation. Two guided waves with different frequencies, wave numbers, and propagation directions interact in a plate. Herein, by vector-based calculations, the internal resonance criteria are formulated and evaluated for waves propagating in arbitrary directions in a plate. The non-zero power flux analysis reveals that non-collinear guided wave interactions transfer power to secondary guided wave modes that is impossible for collinear interactions, which is completely analogous to bulk wave interactions. The phase matching condition, the resonance of nonlinear waves at sum/difference combinations of primary wavevectors, is incorporated to find the wave combinations having cumulative behavior. A list of the most feasible and interesting wave triplets (i.e., two primary waves and one secondary wave) is suggested based on prescribed conditions, and a few of them are studied. In contrast with the current theory that includes interaction of continuous wave packets, an analytical model is introduced for finite-sized interactions and used to demonstrate the effect of group velocity mismatch on the generation of secondary wave fields. Finite element results are compared to the analytical model observations, which gives insight into secondary wave formation. Furthermore, non-collinear mixing of two shear horizontal guided wave is studied by finite element simulation.Shear Horizontal guided waves in the fundamental mode (SH0) are nondispersive and readily generated by magnetostrictive transducers. The interaction of two SH0 primary waves generates secondary Symmetric Lamb waves. Moreover, the different polarization of SH0 waves and secondary Lamb wave fields provides a unique opportunity to isolate material nonlinearity from most of the electronic distortions. The codirectional and counter-propagating interaction of SH0 waves are investigated through finite element simulations and experiments. SH0 waves are generated by magnetostrictive transducers, and secondary symmetric Lamb waves are measured by an angle beam and air-coupled sensors. The results indicate that the material nonlinearities can be isolated from system nonlinearities. Thus, the mutual interaction of guided waves can significantly enhance the quality of nonlinear measurements for material evaluation.

ISBN: 9781392318454Subjects--Topical Terms:

3343996
Applied physics.

Mutual Nonlinear Interaction of Ultrasonic Guided Waves in Plate with Applications for NDE.
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245 1 0 $a Mutual Nonlinear Interaction of Ultrasonic Guided Waves in Plate with Applications for NDE.
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520 $a Ultrasonic methods have an essential role in Nondestructive Evaluation (NDE) and Structural Health Monitoring (SHM) of infrastructure. Early damage in the structure can be diagnosed in microstructural scales whereas conventional NDE methods are less effective. The unique sensitivity of nonlinear ultrasonic waves to microstructural damage has intrigued scholars to search for how to fulfill its potential to prognose early damage in materials. The distorted ultrasonic wave packet, due to the material's nonlinearity, can generate higher harmonics that are associated with incipient damage. The primary benefit of guided waves is that, relative to bulk waves, they can propagate long distances and interrogate inaccessible domains. However, the complex phenomenon of nonlinear guided waves makes the study more difficult. Ultrasonic higher order harmonics are generated due to the interaction of ultrasonic waves in the nonlinear material. Second order harmonics due to self-interactions are often corrupted by electronic nonlinearities. This has complicated the measurement of second harmonics associated with the material's nonlinearity. The mutual interaction of ultrasonic waves generates sum and difference frequencies that are separated from higher harmonics generated by instrumentation. This significant characteristic of mutual interactions is incredibly helpful for the evaluation of microstructure since material nonlinearities are distinguishable from instrumentation nonlinearities. This dissertation is dedicated to the development of the mutual interactions of guided waves in a plate.The general theory of nonlinear guided wave mixing in plate is developed in this dissertation. Two guided waves with different frequencies, wave numbers, and propagation directions interact in a plate. Herein, by vector-based calculations, the internal resonance criteria are formulated and evaluated for waves propagating in arbitrary directions in a plate. The non-zero power flux analysis reveals that non-collinear guided wave interactions transfer power to secondary guided wave modes that is impossible for collinear interactions, which is completely analogous to bulk wave interactions. The phase matching condition, the resonance of nonlinear waves at sum/difference combinations of primary wavevectors, is incorporated to find the wave combinations having cumulative behavior. A list of the most feasible and interesting wave triplets (i.e., two primary waves and one secondary wave) is suggested based on prescribed conditions, and a few of them are studied. In contrast with the current theory that includes interaction of continuous wave packets, an analytical model is introduced for finite-sized interactions and used to demonstrate the effect of group velocity mismatch on the generation of secondary wave fields. Finite element results are compared to the analytical model observations, which gives insight into secondary wave formation. Furthermore, non-collinear mixing of two shear horizontal guided wave is studied by finite element simulation.Shear Horizontal guided waves in the fundamental mode (SH0) are nondispersive and readily generated by magnetostrictive transducers. The interaction of two SH0 primary waves generates secondary Symmetric Lamb waves. Moreover, the different polarization of SH0 waves and secondary Lamb wave fields provides a unique opportunity to isolate material nonlinearity from most of the electronic distortions. The codirectional and counter-propagating interaction of SH0 waves are investigated through finite element simulations and experiments. SH0 waves are generated by magnetostrictive transducers, and secondary symmetric Lamb waves are measured by an angle beam and air-coupled sensors. The results indicate that the material nonlinearities can be isolated from system nonlinearities. Thus, the mutual interaction of guided waves can significantly enhance the quality of nonlinear measurements for material evaluation.
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