Ultrasonics最新文献

{"title":"Dirac cones and topological torsional modes in phononic nanowires using Su–Schrieffer–Heeger Model","authors":"Mohammed Elaouni ,&nbsp;Noura Ezzahni ,&nbsp;Soufyane Khattou ,&nbsp;Madiha Amrani ,&nbsp;Afaf Bouzidi ,&nbsp;Abdellatif Gueddida ,&nbsp;El Houssaine El Boudouti ,&nbsp;Bahram Djafari-Rouhani","doi":"10.1016/j.ultras.2026.107975","DOIUrl":"10.1016/j.ultras.2026.107975","url":null,"abstract":"<div><div>Topological materials have attracted significant attention due to their distinct edge states, known for their robustness to local perturbations. In the field of phononic crystals, these states manifest as topological surface or interface modes, offering promising applications in waveguiding and energy harvesting. This study explores the emergence and control of azimuthal symmetric torsional interface states in phononic nanowires (PNWs) composed of alternating cylindrical layers. In the framework of the Su–Schrieffer–Heeger (SSH) model, we use the Green’s function approach to derive analytical expressions of the dispersion relations to predict all Dirac-point positions and interface modes. The analytical results are confirmed by finite element method simulations performed using COMSOL Multiphysics. In PNWs with symmetric unit cells, band-structures and scattering calculations reveal tunable interface modes whose frequencies and propagation characteristics can be adjusted via geometrical parameters. We also demonstrate through Zak-phase, local density of states (LDOS), and transmission-spectrum analyses that these interface states remain fixed and topologically protected under variations of the dimerization parameter. These findings pave the way for exploiting topological interface states in PNWs, thus opening to innovative phononic devices and contributing to the advancement of the field of topological physics.</div></div>","PeriodicalId":23522,"journal":{"name":"Ultrasonics","volume":"162 ","pages":"Article 107975"},"PeriodicalIF":4.1,"publicationDate":"2026-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146079292","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Ultrasonic pulse transmission through an acoustic barrier using a metamaterial with input impedance matching","authors":"Junyong An ,&nbsp;Chankyu Kim ,&nbsp;Wonju Jeon","doi":"10.1016/j.ultras.2025.107927","DOIUrl":"10.1016/j.ultras.2025.107927","url":null,"abstract":"<div><div>This study proposes an input impedance-matching metamaterial to enable the transmission of ultrasonic pulses by attaching to only one side of a barrier. The metamaterial facilitates ultrasonic pulse transmission through the barrier by mitigating the mismatch between the characteristic impedance of the incident medium and the input impedance at the incident boundary of the barrier. The problem of designing the metamaterial is divided into two sub-problems by introducing a virtual intermediate layer with artificial material properties. In these sub-problems, two meta-layers constituting the metamaterial are designed through topology optimization and simplified to ensure fabrication feasibility. Numerical simulations demonstrate that the simplified metamaterial exhibits high transmittance exceeding 0.5 within 21.2% bandwidth relative to the center frequency, whereas it remains below 0.06 without the metamaterial. In water tank experiments, the transmitted pulse energy is enhanced by 6.83-fold by attaching the metamaterial to the barrier.</div></div>","PeriodicalId":23522,"journal":{"name":"Ultrasonics","volume":"162 ","pages":"Article 107927"},"PeriodicalIF":4.1,"publicationDate":"2026-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146053956","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Particle levitation in tone-burst-excited half-wavelength ultrasonic standing waves in cylindrical microresonator","authors":"Nahae Kim,&nbsp;In-Hwan Yang","doi":"10.1016/j.ultras.2026.107968","DOIUrl":"10.1016/j.ultras.2026.107968","url":null,"abstract":"<div><div>Electrical signals driving piezoelectric transducers in acoustofluidic applications are crucial for acoustic manipulation efficiency, as sinusoidal wave excitation at the resonance frequency determines the acoustic radiation force in application systems. In this study, particle levitation in half-wavelength ultrasonic standing wave fields generated by both continuous-wave and tone-burst excitations of a cylindrical microresonator was investigated by measuring the average velocity of levitating particles and their equilibrium positions. The dependence of these parameters on the characteristics of the sinusoidal voltage amplitude applied to the resonator was examined by evaluating the net force exerting on spherical fluorescent microparticles, including the time-averaged effect of tone-burst excitation. A semi-empirical correlation was proposed to predict the average energy density of the established standing wave field in the resonator. By incorporating a correction factor that quantitatively accounts for the time-averaged effect over the tone-burst repetition period, the model allows one to evaluate the average energy density of half-wavelength ultrasonic standing wave fields generated by continuous-wave and tone-burst voltage amplitudes. The predicted values in good agreement, within less than 18 % of the experimental measurements.</div></div>","PeriodicalId":23522,"journal":{"name":"Ultrasonics","volume":"162 ","pages":"Article 107968"},"PeriodicalIF":4.1,"publicationDate":"2026-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146079331","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Experimental and numerical simulations of ultrasonic wave- multi-phase matter interactions in cement-based composites","authors":"Sukanya Basu ,&nbsp;Saptarshi Sasmal","doi":"10.1016/j.ultras.2026.107971","DOIUrl":"10.1016/j.ultras.2026.107971","url":null,"abstract":"<div><div>In the case of concrete, the predominant damages develop at the microscale level, mostly at a length lesser than the size of inclusions. Again, if the vibrational energy induced by the dynamic loading does not get effectively dissipated by cement-based materials, it may prolong the original micro-defects that strike down the structural durability and safety. Such nontrivial and sensitive investigations require detailed inspection. The incoherent diffuse ultrasonic wave energy carries essential information about the material microstructure. Analysis based on statistical diffusion theory derives two parameters- diffusivity (D) and dissipation (σ), where, D reflects the material microstructure and σ indicates the material’s viscoelastic property and damping effect. Initially, a numerical study is performed for understanding on wave-matter interaction in two scales of heterogeneity (concrete, cement paste) using diffusion-based analysis, so that role of inclusion (in cementitious matrix) on diffusion can be brought out in an uncoupled manner. The diffusivity parameters depend on tortuosity of wave path, transmission modes and the corresponding excitation frequencies. For experimental purpose, prismatic specimens are cast in two scales; ultrasonic measurements are taken with two excitation frequencies (200 and 300 kHz) under three transmission modes (direct, semi-direct, indirect). Signal processing in the Time-Frequency domain is performed to find the characteristic differences in the material microstructures at the same age of hydration (28 days) for both samples. The Spectral Energy Density of the signals provides information on spectral energy over the time window for a particular wave field. In this study, the influence of microstructure in wave propagation is explicitly demonstrated, and theoretical explanations are quantitatively validated with the actual experimental measurements.</div></div>","PeriodicalId":23522,"journal":{"name":"Ultrasonics","volume":"162 ","pages":"Article 107971"},"PeriodicalIF":4.1,"publicationDate":"2026-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146024101","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Evaluation of early-stage corrosion damage using quasi-static component pulse generated by longitudinal critically refracted (LCR) wave","authors":"Meng Qinghang ,&nbsp;Gu Bin ,&nbsp;Yuan Weifeng ,&nbsp;Deng Mingxi ,&nbsp;Ding Xiangyan ,&nbsp;Hu Ning ,&nbsp;Wang Jishuo","doi":"10.1016/j.ultras.2026.107953","DOIUrl":"10.1016/j.ultras.2026.107953","url":null,"abstract":"<div><div>The nonlinear ultrasonic technique is an effective method for characterizing early-stage damage, such as initial corrosion, plastic deformation, and creep. However, the nonlinear response signal induced by micro-damage is typically one or two orders of magnitude weaker than the fundamental wave. This low signal-to-noise ratio is one of the main factors limiting the broader application of nonlinear ultrasonic technology. To address this issue, this study systematically investigates the quasi-static component pulse (QSCP) generated during the propagation of the longitudinal critically refracted (LCR) wave. The feasibility of assessing early corrosion damage in 7075 aluminum alloy was evaluated using the QSCP, a signal feature resulting from the interaction between corrosion-induced microcrack and LCR wave. Both numerical simulation and experimental results demonstrate a positive correlation between the QSCP-based acoustic nonlinearity parameter (ANP) and the extent of corrosion-induced microcrack, which is attributed to the increase in microcrack. Simulation results show that the ANP increases monotonically with the number of microcrack. This trend is experimentally validated, with the ANP showing a significant increase of approximately 54.8% by the fourth stage of corrosion compared to the baseline. These findings confirm the effectiveness and feasibility of the QSCP-based ANP method for detecting early-stage corrosion damage, offering a promising nondestructive approach with high sensitivity for assessing incipient corrosion in critical metallic structures.</div></div>","PeriodicalId":23522,"journal":{"name":"Ultrasonics","volume":"162 ","pages":"Article 107953"},"PeriodicalIF":4.1,"publicationDate":"2026-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145941409","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Directional beam multiplexing using cylindrical holographic acoustic metasurfaces integrated with surface wave reflectors","authors":"Md Tausif Akram ,&nbsp;Pinaki Mazumder ,&nbsp;Kyungjun Song","doi":"10.1016/j.ultras.2026.107974","DOIUrl":"10.1016/j.ultras.2026.107974","url":null,"abstract":"<div><div>Recent advancements in acoustic metasurfaces have significantly improved beamforming and steering capabilities, with beam multiplexing emerging as a key enabler of multidirectional sound projection. This paper proposes a cylindrical holographic acoustic metasurface integrated with surface wave reflectors (SWRs) to realize efficient acoustic beam multiplexing. By transitioning from conventional planar designs to a cylindrical geometry, the proposed metasurface supports the simultaneous generation of multiple highly directional beams at distinct combinations of elevation and azimuthal angles. The integration with SWRs enhances beam collimation and suppresses side lobes, thereby ensuring high directivity and acoustic field confinement. Both simulations and experimental validations confirmed that the metasurface could steer multiple beams generated by a single monopole source in specific directions in 3D space; this capability can help ensure reliable performance across various applications such as sonar, medical imaging, and acoustic communication. The proposed approach represents a versatile and scalable conformal platform for spatially multiplexed acoustic beam steering, marking a significant advancement in the development of multifunctional acoustic metasurfaces.</div></div>","PeriodicalId":23522,"journal":{"name":"Ultrasonics","volume":"162 ","pages":"Article 107974"},"PeriodicalIF":4.1,"publicationDate":"2026-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146079330","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Adaptive sampling for efficient Lamb wavefield reconstruction in composite laminates with Spatial-Temporal Masked AutoEncoder","authors":"Dingcheng Ji ,&nbsp;Wenhao Li ,&nbsp;Fei Gao ,&nbsp;Jiadong Hua ,&nbsp;Jing Lin","doi":"10.1016/j.ultras.2026.107972","DOIUrl":"10.1016/j.ultras.2026.107972","url":null,"abstract":"<div><div>The increasing demand for high-accuracy damage quantification in carbon fiber reinforced plastics (CFRP) has led to the widespread adoption of ultrasonic Lamb wave testing (ULWT) for non-destructive testing (NDT) in various engineering applications. The non-contact Scanning Laser Doppler Vibrometer (SLDV) has emerged as a valuable tool for damage evaluation. However, despite significant research on Lamb wavefield analysis methods, the rapid and reliable acquisition of full wavefield data remains a substantial challenge, limiting SLDV’s applicability in real-world engineering scenarios. This study presents a novel deep learning-based approach to reconstructing full wavefield data from highly under-sampled wavefield data using the Spatial-Temporal Masked AutoEncoder (STMAE). By leveraging time-series high-sparsity Lamb wavefield data, our method achieves remarkable reconstruction performance with a sampling ratio as low as 5%. Furthermore, we propose a novel scanning path optimization method based on Bayesian Optimization, which generates adaptive sparse spatial sampling patterns for wavefield reconstruction. The integration of this adaptive sampling pattern with the STMAE, termed as AdaSTMAE, yields lower precision wavefield prediction error around the damage areas. A comprehensive parametric study on the sampling ratio was conducted and validated through comparative experiments in both single-damage, multi-damage scenarios. The implementation of the adaptive sampling strategy resulted in a 2–16% reduction in reconstruction error for single-damage scenarios and a 0.7–5% reduction for multi-damage scenarios around damage areas, compared to scenarios without the adaptive strategy. Our experimental results demonstrate the outstanding performance of the proposed technique in wavefield reconstruction, achieving an 87–88% reduction in reconstruction error relative to the original masked autoencoder (MAE) across different sampling ratios (5%-25%). Additionally, cross-structural validation using composite blades with variable thickness confirmed the model’s strong generalization capability, effectively reconstructing wavefront distortion and velocity variation without fine-tuning.</div></div>","PeriodicalId":23522,"journal":{"name":"Ultrasonics","volume":"162 ","pages":"Article 107972"},"PeriodicalIF":4.1,"publicationDate":"2026-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146067304","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Modeling nonlinear scattering of phospholipid-coated microbubbles in elastic media","authors":"Ali Rezaei ,&nbsp;David Fernández Rivas ,&nbsp;Guillaume Lajoinie ,&nbsp;Michel Versluis","doi":"10.1016/j.ultras.2026.107964","DOIUrl":"10.1016/j.ultras.2026.107964","url":null,"abstract":"<div><div>Microbubble contrast agents are well-known in the biomedical field for their ability to enhance the contrast in ultrasound imaging and to facilitate targeted drug delivery within the body. Upon injection into the vasculature, these bubbles are strongly influenced by the viscoelastic properties of surrounding soft tissues. Here, we simulate the scattered pressure from a single phospholipid-coated microbubble placed in a uniform viscoelastic medium. We use a modified Rayleigh–Plesset equation that incorporates the viscoelastic response of the phospholipid shell and a Kelvin–Voigt model to represent tissue viscoelasticity. Our simulations aim to investigate the relationship between the viscoelasticity of the medium and that of the bubble shell, and its influence on bubble dynamics as a function of driving pressure, bubble radius, and medium elastic modulus. Results show that the frequency of maximum scatter response increases with the elastic modulus of the medium. While the radial excursion of a <span><math><mrow><mn>2</mn><mo>.</mo><mn>0</mn><mspace></mspace><mi>μ</mi><mi>m</mi></mrow></math></span> radius bubble can decrease by as much as 45% in a medium with an elastic modulus of 200 kPa as compared to that in water, the scattered pressure can increase by 50%. In contrast, the change in harmonic scattering is negligible: simulations predict a increase of only 5% for a <span><math><mrow><mn>2</mn><mo>.</mo><mn>0</mn><mspace></mspace><mi>μ</mi><mi>m</mi></mrow></math></span> bubble when increasing the medium elasticity from 0 to 200 kPa at a driving pressure of 120 kPa. Furthermore, subharmonics generated by driving the bubble at its resonance frequency (TR) are comparable to the subharmonics generated at twice the resonance frequency at lower driving pressures. For elevated pressures the TR/T2R subharmonic ratio increases with increasing elastic modulus. This is in sharp contrast with the resonance behavior of a microbubble in water. These results bear consequences for strategies that exploit the fundamental, harmonic, and subharmonic response of microbubble contrast agents.</div></div>","PeriodicalId":23522,"journal":{"name":"Ultrasonics","volume":"162 ","pages":"Article 107964"},"PeriodicalIF":4.1,"publicationDate":"2026-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146012492","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Design and performance of a novel mode-selectable piezoelectric ultrasonic transducer with controllable output trajectory","authors":"Chuanming Jia,&nbsp;Hongjie Zhang,&nbsp;Xinyue Gao,&nbsp;Yi Zhang","doi":"10.1016/j.ultras.2026.107961","DOIUrl":"10.1016/j.ultras.2026.107961","url":null,"abstract":"<div><div>This study presents a novel mode-selectable piezoelectric ultrasonic transducer (PUT) with a traditional sandwich structure, developed through systematic integration of modular design, electro-mechanical equivalent four-terminal network method, modal optimization techniques, and vibration conversion principles. To evaluate the performance of the proposed PUT, a prototype was fabricated and underwent a series of comprehensive excitation tests. Experimental results indicate that the PUT exhibits two fundamental mechanical resonance modes: a lower-frequency mode characterized by longitudinal-bending (L-B) coupled vibration, and a higher-frequency mode corresponding to pure longitudinal (L) vibration. The proposed transducer enables flexible and seamless switching among the L mode, L-B coupled mode, and a hybrid mode that incorporates both fundamental vibrations, while maintaining excellent energy conversion stability and efficiency during prolonged operation. By adjusting the voltage amplitudes of different frequency components in a dual-frequency composite excitation signal, the vibration at the transducer’s working end can be switched among rectilinear, elliptical, and parallelogram-like trajectories. This enables direct control over the ultrasonic energy action zone. The unique combination of mode-selectable and trajectory-control capabilities gives the proposed transducer significant potential for ultrasonic-assisted precision manufacturing applications.</div></div>","PeriodicalId":23522,"journal":{"name":"Ultrasonics","volume":"162 ","pages":"Article 107961"},"PeriodicalIF":4.1,"publicationDate":"2026-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146024102","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Composite layer formation on AZ91D magnesium alloy via temperature-assisted ultrasonic shot peening for enhanced wear resistance","authors":"Jinrui Xiao ,&nbsp;Xu Liang ,&nbsp;Sentao Diao ,&nbsp;Xincheng Xie ,&nbsp;Lilin Zhang ,&nbsp;Zhongwei Liang","doi":"10.1016/j.ultras.2026.107965","DOIUrl":"10.1016/j.ultras.2026.107965","url":null,"abstract":"<div><div>Developing high wear resistance is crucial for the application of magnesium alloy components under extreme service conditions. In this study, temperature-assisted ultrasonic shot peening (TUSP) incorporating graphene particles was applied to enhance the surface properties of AZ91D magnesium alloy. A composite reinforced surface layer, consisting of micro-dimples, a graphene coating, and a gradient-hardened layer, was successfully fabricated on the surface. The samples treated by low temperature-assisted ultrasonic shot peening (LTUSP) achieved the highest surface hardness of 146.6 HV, corresponding to increases of approximately 69.7% and 23.0% compared with the untreated and conventional USP-treated samples, respectively. The tribological properties of the treated samples were evaluated using a ball-on-disc rotational friction tribometer under normal loads of 5, 7.5, and 10 N, with sliding speeds of 20, 30, and 40 r/min. At a normal load of 5 N and a sliding speed of 30 r/min, the LTUSP-treated samples exhibited a wear rate of approximately 1.63 × 10⁻⁴ mm³/N·m, representing reductions of 91.8% and 54.5% relative to the untreated and conventional USP samples, respectively. An in-depth study revealed that the enhanced wear resistance was primarily attributed to the composite reinforced layer, which mitigated three-body wear, direct contact, and shear failure during the sliding process. This work presents a viable approach for enhancing the wear resistance of AZ91D magnesium alloy.</div></div>","PeriodicalId":23522,"journal":{"name":"Ultrasonics","volume":"162 ","pages":"Article 107965"},"PeriodicalIF":4.1,"publicationDate":"2026-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146019919","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}