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Ultrasonics

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https://www.readbyqxmd.com/read/28427015/apparent-anisotropy-of-adhesive-bonds-with-weak-adhesion-and-non-destructive-evaluation-of-interfacial-properties
#1
Emmanuel Siryabe, Mathieu Rénier, Anissa Meziane, Jocelyne Galy, Michel Castaings
The present research attempts to non-destructively characterize mechanical properties, which are representative of the interfacial adhesion and bond line cohesion of adhesively bonded assemblies, using an ultrasonic method. Eight bonded samples made of two aluminium substrates and of an epoxy-based adhesive layer were manufactured: four in which the adhesive is fully cured (100%) and four in which crosslinking is partial (80%). For each level of curing, four different surface treatments were applied to the aluminium substrates before assembling, in order to vary the quality of adhesion...
April 9, 2017: Ultrasonics
https://www.readbyqxmd.com/read/28412656/design-optimization-of-embedded-ultrasonic-transducers-for-concrete-structures-assessment
#2
Cédric Dumoulin, Arnaud Deraemaeker
In the last decades, the field of structural health monitoring and damage detection has been intensively explored. Active vibration techniques allow to excite structures at high frequency vibrations which are sensitive to small damage. Piezoelectric PZT transducers are perfect candidates for such testing due to their small size, low cost and large bandwidth. Current ultrasonic systems are based on external piezoelectric transducers which need to be placed on two faces of the concrete specimen. The limited accessibility of in-service structures makes such an arrangement often impractical...
April 9, 2017: Ultrasonics
https://www.readbyqxmd.com/read/28411436/acoustic-source-localization-in-an-anisotropic-plate-without-knowing-its-material-properties-a-new-approach
#3
Won Hyun Park, Pawel Packo, Tribikram Kundu
Acoustic source localization (ASL) in a highly anisotropic plate is a challenging task. The basic assumption in many of the currently available techniques is that the wave propagates along a straight line from the source to the receiving sensor. However, waves in anisotropic solids propagate along curved lines and form non-circular wave fronts. As a result, for a highly anisotropic solid the acoustic source localization techniques that assume straight line propagation of waves from the source to the receiver are bound to produce a significant error...
April 7, 2017: Ultrasonics
https://www.readbyqxmd.com/read/28407564/processing-of-acoustic-signals-via-wavelet-choi-williams-analysis-in-three-point-bending-load-of-carbon-epoxy-and-glass-epoxy-composites
#4
Nima Beheshtizadeh, Amir Mostafapour
In this article, acoustic emission method was used for monitoring of flexural loading of GFRP (Glass fiber/epoxy composite) and CFRP (Carbon fiber/epoxy composite) via one acoustical sensor. In order to signal processing, various methods were employed such as wavelet transform, Short time Fourier transform, Choi - Williams transform and etc. Using two signal processing methods, wavelet transform and Choi - Williams transform, for monitoring of GFRP and CFRP specimens, determines strengths and weaknesses of each method and appointed the best analysis for signal processing of three point bending load of this type of composites...
April 5, 2017: Ultrasonics
https://www.readbyqxmd.com/read/28408049/ultrasound-responsive-nipam-based-hydrogels-with-tunable-profile-of-controlled-release-of-large-molecules
#5
Chueh-Hung Wu, Ming-Kuan Sun, Jay Shieh, Chuin-Shan Chen, Chang-Wei Huang, Chi-An Dai, Shu-Wei Chang, Wen-Shiang Chen, Tai-Horng Young
Episodic release of bioactive compounds plays an important role in biological systems. "On-demand" release systems which based on polymeric materials and activated by external stimuli may provide the necessary functionality. Here we describe an ultrasound-responsive hydrogel based on N-isopropylacrylamide (NIPAM) and N,N'-methylenebisacrylamide (MBAm), which is suitable for triggered release of two large molecules: bovine serum albumin (BSA, 66kDa) and dextran (3-5kDa). It is shown that the release amount of these two large molecules increased with increasing hydrogel temperature, and the application of ultrasound further increased the release...
April 2, 2017: Ultrasonics
https://www.readbyqxmd.com/read/28395212/acoustic-field-structure-simulation-in-quasi-collinear-acousto-optic-cells-with-ultrasound-beam-reflection
#6
S N Mantsevich, V Ya Molchanov, K B Yushkov, V S Khorkin, M I Kupreychik
Ultrasound wave reflection from one of the crystal faces is the convenient way to arouse the acoustic beam with a desired propagation direction in acousto-optic cells with collinear and quasi-collinear interaction geometries. The reflection process effects on the ultrasound field amplitude and phase structure. The method to simulate the reflected finite ultrasound beam structure in the case of acoustically anisotropic media is presented in this paper. The investigation is carried on the example of two quasi-collinear acousto-optic cells fabricated on the base of tellurium dioxide crystal...
April 2, 2017: Ultrasonics
https://www.readbyqxmd.com/read/28389013/ultrasound-attenuation-and-phase-velocity-of-micrometer-sized-particle-suspensions-with-viscous-and-thermal-losses
#7
Hayato Mori, Tomohisa Norisuye, Hideyuki Nakanishi, Qui Tran-Cong-Miyata
The attenuation coefficient and the phase velocity of micrometer-sized polydivinylbenzene particles in water were investigated by ultrasound spectroscopy equipped with 10-30MHz longitudinal wave transducers. While the surrounding liquid could be assumed to be inviscid for large particles with the size comparable to the wavelength of longitudinal ultrasound, the viscous and thermal waves were considered to have important roles with decreasing the particle size because the particle size becomes comparable with those wavelengths...
March 30, 2017: Ultrasonics
https://www.readbyqxmd.com/read/28404320/influence-of-extrinsic-operational-parameters-on-salt-diffusion-during-ultrasound-assisted-meat-curing
#8
Elena S Inguglia, Zhihang Zhang, Catherine Burgess, Joseph P Kerry, Brijesh K Tiwari
The present study investigated the effect of geometric parameters of the ultrasound instrument during meat salting in order to enhance salt diffusion and salt distribution in pork meat on a lab scale. The effects of probe size (∅2.5 and 1.3cm) and of different distances between the transducer and the meat sample (0.3, 0.5, and 0.8cm) on NaCl diffusion were investigated. Changes in the moisture content and NaCl gain were used to evaluate salt distribution and diffusion in the samples, parallel and perpendicular to ultrasound propagation direction...
March 27, 2017: Ultrasonics
https://www.readbyqxmd.com/read/28351747/improved-contrast-for-high-frame-rate-imaging-using-coherent-compounding-combined-with-spatial-matched-filtering
#9
Yang Lou, Jesse T Yen
The concept of high frame rate ultrasound imaging (typically greater than 1000 frames per second) has inspired new fields of clinical applications for ultrasound imaging such as fast cardiovascular imaging, fast Doppler imaging and real-time 3D imaging. Coherent plane-wave compounding is a promising beamforming technique to achieve high frame rate imaging. By combining echoes from plane waves with different angles, dynamic transmit focusing is efficiently accomplished at all points in the image field. Meanwhile, the image frame rate can still be kept at a high level...
March 20, 2017: Ultrasonics
https://www.readbyqxmd.com/read/28347509/sonochemical-growth-of-nanomaterials-in-carbon-nanotube
#10
M Jesionek, M Nowak, K Mistewicz, M Kępińska, D Stróż, I Bednarczyk, R Paszkiewicz
Recent achievements in investigations of carbon nanotubes (CNTs) filled with ternary chalcohalides (antimony sulfoiodide (SbSI) and antimony selenoiodide (SbSeI)) are presented. Parameters of sonochemical encapsulation of nanocrystalline semiconducting ferroelectric SbSI-type materials in CNTs are reported. This low temperature technology is convenient, fast, efficient and environmentally friendly route for producing novel type of hybrid materials useful for nanodevices. Structure as well as optical and electrical properties of SbSI@CNTs and SbSeI@CNTs are described...
March 18, 2017: Ultrasonics
https://www.readbyqxmd.com/read/28347508/ultrasonic-assisted-extrusion-of-zk60mg-alloy-micropins-at-room-temperature
#11
Yan Lou, Xiao Liu, Jinsong He, Min Long
A new model of ZK60 magnesium micropins formed through ultrasonic-assisted extrusion at room temperature was developed. The billet was transmitted by the ultrasonic wave during the micropin-forming process. A self-designed apparatus was applied for the ultrasonic-assisted extrusion experiments. The effects of amplitude on the load-displacement curve, load reduction, temperature, microstructure, diameter after extrusion, microhardness, and compressibility of micropins were investigated. The results showed that the punch was always in contact with the billet when the displacement of the punch was larger than the amplitude...
March 18, 2017: Ultrasonics
https://www.readbyqxmd.com/read/28342322/ultrasonic-field-modeling-in-anisotropic-materials-by-distributed-point-source-method
#12
Samaneh Fooladi, Tribikram Kundu
DPSM (distributed point source method) is a modeling technique which is based on the concept of Green's function. First, a collection of source and target points are distributed over the solution domain based on the problem description and solution requirements. Then, the effects from all source points are superimposed at the location of every individual target point. Therefore, a successful implementation of DPSM entails an effective evaluation of Green's function between many pairs of source and target points...
March 16, 2017: Ultrasonics
https://www.readbyqxmd.com/read/28342323/computer-aided-tumor-diagnosis-using-shear-wave-breast-elastography
#13
Woo Kyung Moon, Yao-Sian Huang, Yan-Wei Lee, Shao-Chien Chang, Chung-Ming Lo, Min-Chun Yang, Min Sun Bae, Su Hyun Lee, Jung Min Chang, Chiun-Sheng Huang, Yi-Ting Lin, Ruey-Feng Chang
The shear wave elastography (SWE) uses the acoustic radiation force to measure the stiffness of tissues and is less operator dependent in data acquisition compared to strain elastography. However, the reproducibility of the result is still interpreter dependent. The purpose of this study is to develop a computer-aided diagnosis (CAD) method to differentiate benign from malignant breast tumors using SWE images. After applying the level set method to automatically segment the tumor contour and hue-saturation-value color transformation, SWE features including average tissue elasticity, sectional stiffness ratio, and normalized minimum distance for grouped stiffer pixels are calculated...
March 15, 2017: Ultrasonics
https://www.readbyqxmd.com/read/28334635/ultrasonic-subwavelength-phase-conjugated-mirror-with-a-layer-of-bubbles
#14
O Lombard, C Barrière, V Leroy
A single layer of gas bubbles in a yield-stress fluid is experimentally shown to behave as a phase-conjugated (PC) mirror with a thickness 250 times smaller than the wavelength (0.14mm-diameter bubbles for phase-conjugation at 40kHz). A high amplitude pump wave at frequency 80kHz interacts with a lower amplitude probe wave centered at 40kHz. A PC-reflection coefficient of 0.15 is obtained for a 50kPa pump. A perturbative second-order theory is shown to quantitatively describe the experimental observations.
March 15, 2017: Ultrasonics
https://www.readbyqxmd.com/read/28371650/applications-of-a-nanocomposite-inspired-in-situ-broadband-ultrasonic-sensor-to-acousto-ultrasonics-based-passive-and-active-structural-health-monitoring
#15
Menglong Liu, Zhihui Zeng, Hao Xu, Yaozhong Liao, Limin Zhou, Zhong Zhang, Zhongqing Su
A novel nanocomposite-inspired in-situ broadband ultrasonic sensor previously developed, with carbon black as the nanofiller and polyvinylidene fluoride as the matrix, was networked for acousto-ultrasonic wave-based passive and active structural health monitoring (SHM). Being lightweight and small, this kind of sensor was proven to be capable of perceiving strain perturbation in virtue of the tunneling effect in the formed nanofiller conductive network when acousto-ultrasonic waves traverse the sensor. Proof-of-concept validation was implemented, to examine the sensor performance in responding to acousto-ultrasonic waves in a broad frequency regime: from acoustic emission (AE) of lower frequencies to guided ultrasonic waves (GUWs) of higher frequencies...
March 14, 2017: Ultrasonics
https://www.readbyqxmd.com/read/28347871/acoustic-emission-source-localization-in-thin-metallic-plates-a-single-sensor-approach-based-on-multimodal-edge-reflections
#16
A Ebrahimkhanlou, S Salamone
This paper presents a new acoustic emission (AE) source localization for isotropic plates with reflecting boundaries. This approach that has no blind spot leverages multimodal edge reflections to identify AE sources with only a single sensor. The implementation of the proposed approach involves three main steps. First, the continuous wavelet transform (CWT) and the dispersion curves of the fundamental Lamb wave modes are utilized to estimate the distance between an AE source and a sensor. This step uses a modal acoustic emission approach...
March 14, 2017: Ultrasonics
https://www.readbyqxmd.com/read/28324776/microstructural-evolution-of-ti6al4v-in-ultrasonically-assisted-cutting-numerical-modelling-and-experimental-analysis
#17
Wei Bai, Ronglei Sun, Jürgen Leopold, Vadim V Silberschmidt
This paper aims to elucidate the effect of ultrasonically assisted cutting (UAC) on microstructure in a machined surface and a chip of Ti6Al4V alloy. To investigate microstructural evolution, a FE-based cutting model with an enhanced material formulation and temperature dependent material properties was developed. A Johnson-Mehl-Avrami-Kolmogorov (JMAK) model for the Ti6Al4V alloy was employed to simulate dynamic recrystallization and predict a resultant grain size. Due to a specific thermomechanical load in UAC, the distributions of strains, strain rates and temperatures in a workpiece in the machining process were investigated...
March 9, 2017: Ultrasonics
https://www.readbyqxmd.com/read/28324775/investigation-of-the-ultrasonic-attenuation-in-anisotropic-weld-materials-with-finite-element-modeling-and-grain-scale-material-description
#18
P E Lhuillier, B Chassignole, M Oudaa, S O Kerhervé, F Rupin, T Fouquet
A finite element modeling approach of ultrasonic propagation combined with a description of the microstructure at the scale of the grains has been implemented. The simulations seek to determine the contribution of scattering to the ultrasonic attenuation in polycrystalline materials. The approach is applied to anisotropic microstructures exhibiting both elongated grains and transversely isotropic crystallographic texture which can be found in multipass welds. The ultrasonic propagation is computed with the 2D finite element code ATHENA 2D...
March 8, 2017: Ultrasonics
https://www.readbyqxmd.com/read/28324777/a-feasibility-study-of-a-novel-spectral-method-using-radiofrequency-ultrasound-data-for-monitoring-laser-tissue-ablation
#19
Enrico Vannacci, Simona Granchi, Luca Breschi, Elena Biagi
This paper presents preliminary results of a new non-invasive ultrasound monitoring method called TUV (Thermotherapy Ultrasonic View) able to investigate structural tissue modifications caused by minimally invasive percutaneous laser ablation. The method, based on the spectral analysis of the raw ultrasound radiofrequency signal, develops spectral parameters in a multidimensional space and its N dimensions are represented by the central frequencies of the sub bands the signal spectrum is decomposed into. Signal processing has been performed on the data related to 7 laser treatments performed on 4 samples of removed prostatic glands which underwent laser ablation at power of 3W, 4W and 5W and energy of 1800J...
March 6, 2017: Ultrasonics
https://www.readbyqxmd.com/read/28319820/evidence-of-a-broadband-gap-in-a-phononic-crystal-strip
#20
Etienne Coffy, Sébastien Euphrasie, Mahmoud Addouche, Pascal Vairac, Abdelkrim Khelif
We experimentally demonstrate a very large ultrasonic band gap in a one-dimensional phononic crystal. The structure consists of periodic tungsten pillars fixed to a tailored silicon strip with a layer of epoxy. Combining local resonances and Bragg scattering, the gap ranges from 450kHz to 1250kHz, which corresponds to a gap-to-midgap ratio of 94%, and the attenuation exceeds 35dB with only three periods. Numerical calculations with the Finite Element Method are performed to support the analysis and provide a better understanding of the behavior of the structure...
March 6, 2017: Ultrasonics
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