Zobrazeno 1 - 10
of 35
pro vyhledávání: '"Gaofeng Sha"'
Autor:
Gaofeng Sha, Albdulaziz I. Albannai
Publikováno v:
e-Journal of Nondestructive Testing, Vol 29, Iss 6 (2024)
The scattering and attenuation of high frequency ultrasonic wave in polycrystalline materials such as metal and ceramics have implication of material microstructures. Many studies have recently developed sophisticate forward models that corelate ultr
Externí odkaz:
https://doaj.org/article/37156e06d6474d9d86d38b34eaa07945
Autor:
Gaofeng Sha
Publikováno v:
Acoustics, Vol 2, Iss 1, Pp 51-72 (2020)
This study extends the second-order attenuation (SOA) model for elastic waves in texture-free inhomogeneous cubic polycrystalline materials with equiaxed grains to textured polycrystals with ellipsoidal grains of arbitrary crystal symmetry. In term o
Externí odkaz:
https://doaj.org/article/0aadf608c91147358a0ca11f6eea6c44
Autor:
Gaofeng Sha, Cliff J. Lissenden
Publikováno v:
Sensors, Vol 21, Iss 23, p 7971 (2021)
Ultrasonic guided waves provide unique capabilities for the structural health monitoring of plate-like structures. They can detect and locate various types of material degradation through the interaction of shear-horizontal (SH) waves and Lamb waves
Externí odkaz:
https://doaj.org/article/8125f3c7a9904bc8bc613391a2a36cd8
Autor:
Gaofeng Sha, Cliff J. Lissenden
Publikováno v:
Lecture Notes in Civil Engineering ISBN: 9783031073212
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::0508ff1ccd823a841e04e3309dced441
https://doi.org/10.1007/978-3-031-07322-9_26
https://doi.org/10.1007/978-3-031-07322-9_26
Publikováno v:
The Journal of the Acoustical Society of America. 149:2377-2394
This work develops a second-order approximation (SOA) model and a three-dimensional (3D) finite element (FE) model to calculate scattering-induced attenuation for elastic wave propagation in polycrystals with elongated grains of arbitrary crystal sym
Publikováno v:
The Journal of the Acoustical Society of America. 148:3645-3662
The phase velocity dispersion of longitudinal waves in polycrystals with elongated grains of arbitrary crystallographic symmetry is studied in all frequency ranges by the theoretical second-order approximation (SOA) and numerical three-dimensional fi
Impact of nuclear reactor radiation on the performance of AlN/sapphire surface acoustic wave devices
Publikováno v:
Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms. 481:35-41
The performance of an AlN/sapphire surface acoustic wave (SAW) delay line device was characterized in real time under irradiation inside a nuclear reactor. Both its resonant frequency and transmission efficiency were observed to respond to a change i
Publikováno v:
Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms. 472:46-52
In-situ measurement of LiNbO3 based surface acoustic wave (SAW) crystal resonator device under irradiation was demonstrated and used to characterize the impact of radiation on physical properties of this material. The resonant frequency of the SAW de
Autor:
Gaofeng Sha
Publikováno v:
Mathematics and Mechanics of Solids. 25:1155-1171
Modeling the scattering-induced attenuation of elastic waves in heterogeneous polycrystals has practical applications in seismology and non-destructive evaluation. However, attenuation modeling for polycrystals with preferred crystallographic orienta
Autor:
Cliff J. Lissenden, Gaofeng Sha
Publikováno v:
Sensors (Basel, Switzerland)
Sensors, Vol 21, Iss 7971, p 7971 (2021)
Sensors; Volume 21; Issue 23; Pages: 7971
Sensors, Vol 21, Iss 7971, p 7971 (2021)
Sensors; Volume 21; Issue 23; Pages: 7971
Ultrasonic guided waves provide unique capabilities for the structural health monitoring of plate-like structures. They can detect and locate various types of material degradation through the interaction of shear-horizontal (SH) waves and Lamb waves