Detection and localization of corrosion using the combination information of multiple Lamb wave modes
Ultrasonics. 2024 Jan 19;138:107246. doi: 10.1016/j.ultras.2024.107246. Online ahead of print.ABSTRACTThemulti-modeanddispersionnature of Lamb waves means that a variety of modes with individual mode structures and distinct dispersion behaviors would propagate in the structures simultaneously. The existence of a corrosion would result in thickness reduction, which means the frequency-thickness product under a specific excitation would also decrease. Due to dispersion diversity, the interaction of each individual Lamb mode at the corrosion may be distinct, i.e., the velocity varies in different extent and even in opposite t...
Source: Ultrasonics - February 3, 2024 Category: Physics Authors: Liping Huang Zhi Luo Liang Zeng Jing Lin Source Type: research
Generation of time-independent torque by ultrasonic guided waves
Ultrasonics. 2024 Jan 24;138:107250. doi: 10.1016/j.ultras.2024.107250. Online ahead of print.ABSTRACTThe excitation of acoustic waves by a unidirectional transducer, integrated in a piezoelectric cylindrical tube or disk, can lead to a time-independent torque. This phenomenon, demonstrated earlier in experiments and analyzed with coupling-of mode theory, is explained in detail, starting on the level of lattice dynamics of a piezoelectric crystal. Expressions are derived for the stationary torque in the form of integrals over the volume or surface of the piezoelectric, involving the electric potential and displacement fiel...
Source: Ultrasonics - February 2, 2024 Category: Physics Authors: I A Nedospasov P D Pupyrev A Sotnikov H Schmidt M Weihnacht A P Mayer Source Type: research
Convolutional neural network and level-set spectral element method for ultrasonic imaging of delamination cavities in an anisotropic composite structure
We present a computational approach that incorporates a convolutional neural network (CNN) for detecting internal delamination in a layered 2D plane-strain anisotropic composite structure of transient elastodynamic fields. The two-dimensional spectral element method (SEM) is utilized to simulate the propagation of elastic waves in an orthotropic solid sandwiched by isotropic solids and their interaction with the internal delamination cavity. This work generates training data consisting of input-layer features (i.e., measured wave signals) and output-layer features (i.e., element types, such as void or regular, of all eleme...
Source: Ultrasonics - February 2, 2024 Category: Physics Authors: Boyoung Kim Shashwat Maharjan Fazle Mahdi Pranto Bruno Guidio Christoph Schaal Chanseok Jeong Source Type: research
Think twice before f-numbering
Ultrasonics. 2023 Dec 15;138:107222. doi: 10.1016/j.ultras.2023.107222. Online ahead of print.ABSTRACTIn a 2021 paper, we delved into the details of delay-sum beamforming (DAS) in high-frame-rate ultrasound for medical imaging [1]. We also proposed a simple and fast method of determining an f-number, which is based on the directivity of the transducer elements. In their comment, Martin F. Schiffner and Georg Schmitz argue that we mistakenly link image quality enhancement to the reduction of measurement noise. They disapprove our proposed f-number, claiming it deteriorates the signal-to-noise ratio (SNR). Based on their pre...
Source: Ultrasonics - January 30, 2024 Category: Physics Authors: Damien Garcia Mohamed Tamraoui Fran çois Varray Source Type: research
Multi-mode coupled vibration analysis and radiation sound field investigation of a novel multidirectional piezoelectric ultrasonic transducer
Ultrasonics. 2024 Jan 18;138:107248. doi: 10.1016/j.ultras.2024.107248. Online ahead of print.ABSTRACTNowadays, expanding the operating range and realizing multifrequency operation have emerged as focal and imperative objectives in the design of ultrasonic transducers. Due to the limitations of structure and radial sizes, conventional Langevin transducers encounter challenges in meeting the increasingly stringent requirements across diverse ultrasonic applications. Hence, this paper proposes a multidirectional piezoelectric ultrasonic transducer (MPUT) consisting of a large-dimension sandwich piezoelectric transducer (LSPT...
Source: Ultrasonics - January 26, 2024 Category: Physics Authors: Cheng Chen Jianzhong Guo Shuyu Lin Source Type: research
Finite element modelling strategy for determining directivity of thermoelastically generated laser ultrasound
Ultrasonics. 2024 Jan 24;138:107252. doi: 10.1016/j.ultras.2024.107252. Online ahead of print.ABSTRACTLaser ultrasound (LU) is a contactless and couplant-free remote non-destructive (NDE) technique, which uses lasers for ultrasonic generation and detection rather than conventional piezoelectric transducers. For a transducer, an important characteristic is the directivity, the angle-dependent amplitude of the ultrasonic waves generated in the material. In the non-destructive thermoelastic regime, LU source has been widely modelled as a surface force dipole. However, the directivity of LU in more complex material, where ther...
Source: Ultrasonics - January 26, 2024 Category: Physics Authors: Xin L Tu Jie Zhang Alberto M Gambaruto Paul D Wilcox Source Type: research
In-situ sparse-array imaging for through-thickness cracks in plates with A < sub > 0 < /sub > Lamb waves and an efficient waveform inversion algorithm
Ultrasonics. 2024 Jan 17;138:107247. doi: 10.1016/j.ultras.2024.107247. Online ahead of print.ABSTRACTStructural health monitoring (SHM) requires efficient online crack detection and characterization to prevent structural failures, which mainly arise from fatigue cracks. Existing solutions for crack characterization involve analyzing sensed wave signals directly, but these approaches usually require onerous steps or many sensors to obtain sufficient and clear wave packets. An alternative strategy is a model-based inversion, which takes the full waveform into consideration and does not require analysis on a single wave pack...
Source: Ultrasonics - January 20, 2024 Category: Physics Authors: Shengyuan Zhang Jinglei Yang Wenjing Ye Source Type: research
Investigating the flexural behavior of nanomodified multi-delaminated composites using acoustic emission technique
This study aims to examine the effects of nano-additives, specifically carbon nanotubes and nanosilica, on the flexural behavior of glass/epoxy composites containing multiple embedded delaminations. The acoustic emission technique is employed to gain deeper insights into the damage mechanisms associated with flexural failure. Artificial delaminations of varying sizes, arranged in a triangular pattern, were introduced into four interlayers of a [(0/90)2]s oriented glass/epoxy composite. The findings reveal a notable reduction in flexural properties due to the presence of multiple delaminations. However, the addition of nano...
Source: Ultrasonics - January 19, 2024 Category: Physics Authors: Sajad Alimirzaei Reza Barbaz-Isfahani Arash Khodaei Mehdi Ahmadi Najafabadi Mojtaba Sadighi Source Type: research
Noninvasive assessment of pressure distribution and fractional flow in middle cerebral artery using microbubbles and plane wave in vitro
Ultrasonics. 2024 Jan 14;138:107244. doi: 10.1016/j.ultras.2024.107244. Online ahead of print.ABSTRACTFractional flow has been proposed for quantifying the degree of functional stenosis in cerebral arteries. Herein, subharmonic aided pressure estimation (SHAPE) combined with plane wave (PW) transmission was employed to noninvasively estimate the pressure distribution and fractional flow in the middle cerebral artery (MCA) in vitro. Consequently, the effects of incident sound pressure (peak negative pressures of 86-653 kPa), pulse repetition frequency (PRF), number of pulses, and blood flow rate on the subharmonic pressure ...
Source: Ultrasonics - January 18, 2024 Category: Physics Authors: Xiaoyang Qiao Ruiyan Zhang Jianjun Yu Yadi Yan Ayache Bouakaz Xiao Su Jiacheng Liu Yujin Zong Mingxi Wan Source Type: research
Artificial intelligence-based speckle featurization and localization for ultrasound speckle tracking velocimetry
Ultrasonics. 2024 Jan 11;138:107241. doi: 10.1016/j.ultras.2024.107241. Online ahead of print.ABSTRACTDeep learning-based super-resolution ultrasound (DL-SRU) framework has been successful in improving spatial resolution and measuring the velocity field information of a blood flows by localizing and tracking speckle signals of red blood cells (RBCs) without using any contrast agents. However, DL-SRU can localize only a small part of the speckle signals of blood flow owing to ambiguity problems encountered in the classification of blood flow signals from ultrasound B-mode images and the building up of suitable datasets requ...
Source: Ultrasonics - January 17, 2024 Category: Physics Authors: Hyo Seung Lee Jun Hong Park Sang Joon Lee Source Type: research
Carbon nanofibers/liquid metal composites for high temperature laser ultrasound
Ultrasonics. 2024 Jan 13;138:107245. doi: 10.1016/j.ultras.2024.107245. Online ahead of print.ABSTRACTAs the demand for clean energy becomes greater worldwide, there will also be an increasing demand for next generation nuclear power plants that incorporate advanced sensors and monitoring equipment. A major challenge posed by nuclear power plants is that, during normal operation, the reactor compartment is subjected to high operating temperatures and radiation flux. Diagnostic sensors monitoring such structures are also subject to temperatures reaching hundreds of degrees Celsius, which puts them at risk for heat degradati...
Source: Ultrasonics - January 17, 2024 Category: Physics Authors: Nicholas Garcia Howuk Kim Kaushik Vinod Abinash Sahoo Michael Wax Taeyang Kim Tiegang Fang Venkat Narayanaswamy Huaiyu Wu Xiaoning Jiang Source Type: research
Nondestructive corrosion degradation assessment based on asymmetry of guided wave propagation field
Ultrasonics. 2024 Jan 9;138:107243. doi: 10.1016/j.ultras.2024.107243. Online ahead of print.ABSTRACTThe article presents the results of numerical and experimental investigation of guided wave propagation in steel plates subjected to corrosion degradation. The development of novel procedures allowing for the assessment of the corrosion degradation level is crucial in the effective diagnostics of offshore and ship structures that are especially subjected to aggressive environments. The study's main aim is to investigate the influence of surface irregularities on wave propagation characteristics. The paper investigates wavef...
Source: Ultrasonics - January 13, 2024 Category: Physics Authors: Beata Zima Emil Roch Jochen Moll Source Type: research
A comprehensive study of ultrasonic-assisted gas metal arc welding of high-strength steel
Ultrasonics. 2024 Jan 7;138:107242. doi: 10.1016/j.ultras.2024.107242. Online ahead of print.ABSTRACTThe present study investigated longitudinal ultrasonic vibrations applied uniformly perpendicular to the weld line as an efficient approach in the ultrasonic-assisted gas metal arc welding (U-GMAW) of high-strength steel. The penetration depth, microstructure, microhardness, mechanical properties, and corrosion of welded joints produced from GMAW and U-GMAW were experimentally explored at different welding conditions to evaluate their performance. The experimental findings show that welded joints produced by U-GMAW have a m...
Source: Ultrasonics - January 11, 2024 Category: Physics Authors: Abbas Pak Hamid Shams Hamid Reza Rezaei Ashtiani Yahya Choopani Source Type: research
In vivo exposure of the bladder using a non-invasive high intensity focused ultrasound toroidal transducer
Ultrasonics. 2024 Jan 3;138:107239. doi: 10.1016/j.ultras.2024.107239. Online ahead of print.ABSTRACTA toroidal high-intensity focused ultrasound (HIFU) transducer was used to expose normal bladder wall tissues non-invasively in vivo in a porcine model in order to investigate the potential to treat bladder tumors. The transducer was divided into 32 concentric rings with equal surface areas, operating at 2.5 MHz. Eight animals were split into two groups of 4. In the first group, post-mortem evaluation was performed immediately after ultrasound exposure. In the second group, animals survived for up to seven days before post-...
Source: Ultrasonics - January 11, 2024 Category: Physics Authors: Victor Delattre Sophie Cambronero Yao Chen Gail Ter Haar Ian Rivens Gerry Polton Cyril Lafon David Melodelima Source Type: research
Characterization on vermicular graphite rate and tensile strength in vermicular graphite cast iron based on nonlinear ultrasonic technique
This study explores the feasibility of using the nonlinear ultrasonic technique (NUT) to characterize the vermicular graphite rate and tensile strength. Based on the longitudinal critically refracted (LCR) wave detection model, an experimental study to detect the vermicular graphite rate and tensile strength of vermicular graphite cast iron is carried out using the nonlinear ultrasonic harmonic method, and compared with the ultrasonic velocity method. The experiment results show that the relative nonlinear parameter of the LCR wave decreases along with the increase of vermicular graphite rate and increases along with the i...
Source: Ultrasonics - January 10, 2024 Category: Physics Authors: Yan Tang Hanying Mao Chunhua He Hanling Mao Yiwen Bi Zhengfeng Huang Xinxin Li Yongchuan Lin Source Type: research
