Article
Engineering, Multidisciplinary
Beata Zima
Summary: Many current studies in damage detection using elastic wave propagation rely on large sensor networks with piezoelectric transducers, which may not accurately represent the size and shape of cracks in real cases. This paper introduces a novel method that only requires three sensors to localize and estimate cracks of various sizes and shapes.
Article
Mathematics, Applied
Sourav Kumar Panja, Subhas Chandra Mandal
Summary: This article presents the interaction of anti-plane shear waves by two collinear cracks in 1D hexagonal piezoelectric quasicrystals. The boundary value problem is transformed into integral equations and solved analytically. The explicit expressions for dynamic stress intensity factors, crack opening displacement, and electric displacement are derived, and the effects of crack length and electric boundary condition are examined.
ZAMM-ZEITSCHRIFT FUR ANGEWANDTE MATHEMATIK UND MECHANIK
(2023)
Article
Engineering, Civil
Shixuan Shao, Rongyu Xia, Zheng Li
Summary: This paper proposes a novel piezoelectric metasurface for simultaneously manipulating multi-mode guided waves in a plate, which has significant potential in the fields of guided wave manipulation and smart device design.
ENGINEERING STRUCTURES
(2022)
Article
Computer Science, Information Systems
Alessandro Nastro, Marco Bau, Marco Ferrari, Libor Rufer, Skandar Basrour, Vittorio Ferrari
Summary: The possibility of steering floating cells dispersed in water using flexural plate waves generated by a piezoelectric MEMS transducer has been explored. The working principle has been validated through simulations and experimental testing. The results show successful alignment of cells using this method.
Article
Mechanics
Vagif M. Mirsalimov
Summary: This study investigates a plane elastic-plastic problem of stress distribution in a circular hole thin plate involving the initiation and propagation of cracks. By employing the methods of perturbation theory and theory of singular integral equations, the location and sizes of crack initiation zones, as well as the interface between elastic and plastic deformations, are determined.
ARCHIVE OF APPLIED MECHANICS
(2021)
Article
Mechanics
Mouldi Zagrouba, Mohamed Shili Bouhdima
Summary: This study investigates the propagation of transversally horizontal waves in piezoelectric plates using the power series technique. It analyzes the sensitivity of SH wave characteristics to different plate properties and discusses the compensation between their effects on phase velocity, electromechanical coupling coefficient, and SH wave structure. These findings can be valuable for the design of acoustic wave devices.
Article
Acoustics
Shrinivas G. Joshi
Summary: This research developed an ultrasonic flow meter using mode coupling transducers, which are fabricated on thin plates of lithium niobate and can measure flow rates from less than 0.2 lpm to greater than 100 lpm.
Article
Green & Sustainable Science & Technology
Ming Xie, Jiahao Liu, Song Lu
Summary: This paper proposes a combination method that combines superposition and wavelet threshold to improve the accuracy of elastic waveform signals, and the feasibility of the method is verified through simulations and experiments.
Article
Acoustics
Dezhi Li, Chunli Zhang, Shufang Zhang, Huiming Wang, Weiqiu Chen, Chuanzeng Zhang
Summary: Introduces the characteristics and applications of terahertz elastic waves in piezoelectric semiconductor structures. Three rod models are presented to analyze the propagation of elastic longitudinal waves, and the effects of piezoelectricity and semiconductor properties on dispersion behavior are investigated. The results provide theoretical foundations for the design of terahertz elastic wave-based devices.
Article
Engineering, Mechanical
Mengdi Jia, Zhimin Wu, Xiaoyan Han, Hong Chen, Rena C. Yu
Summary: The critical crack propagation length is crucial for calculating the fracture toughness of concrete and evaluating the safety of cracked concrete structures. This study measured the critical crack propagation lengths of notched three-point bending beams with different geometric dimensions and concrete strength grades using two experimental methods. A modified analytical method was also proposed to accurately determine the critical crack propagation length and derive the fracture toughness of concrete.
THEORETICAL AND APPLIED FRACTURE MECHANICS
(2022)
Article
Computer Science, Information Systems
Xin Su, Xincheng Ren, Haoji Wan, Xingfang Jiang, Xianyun Liu
Summary: This study establishes a mid- to low-frequency transducer unit model to address the issue of the relatively low piezoelectric constant of aluminum nitride (AlN) piezoelectric film. The results show that the optimized upper electrode distribution improves the acoustic field radiation of the array element, and the optimized electrode geometry parameters also influence the acoustic wave direction.
Article
Materials Science, Multidisciplinary
Ming Zhao, Wentao Jiang, Qingyuan Wang, Haidong Fan, Xiaobao Tian
Summary: In this study, a method based on applied electric field is developed to solve the scattering problems of flexural waves in piezoelectric thin plates with defects. It is found that the dynamic moment concentration factor (DMCF) of piezoelectric materials is significantly larger than that of ordinary elastic materials due to electro-mechanical coupling. In the low frequency region, the DMCF depends on the applied electric field and is independent of the incident angle, while the opposite phenomenon is observed as the frequency increases. These results provide theoretical guidance for the dynamic analysis and strength design of piezoelectric material structures.
MECHANICS OF ADVANCED MATERIALS AND STRUCTURES
(2023)
Article
Engineering, Electrical & Electronic
Basudeba Behera
Summary: The research introduces a newly developed mechanism using liquid as a surface acoustic wave actuator to achieve linear motion with a lightweight design. By utilizing Rayleigh waves on piezoelectric stators transmitting into a liquid medium, the actuator drives a slider in translational motion.
SENSORS AND ACTUATORS A-PHYSICAL
(2021)
Article
Engineering, Marine
Ashraf Attia, Heba S. El Kilani, Mostafa M. EL Afandy, S. Saad-Eldeen
Summary: In this study, experimental and numerical results of intact and cracked aluminum panels under uniaxial compressive load are presented and compared. A calibrated model of the intact panel is used to simulate the experimental test conditions, based on actual mechanical properties obtained from a tensile test. The ultimate compressive capacity of the intact panel is in good agreement with existing empirical formulations. The calibrated model is modified to account for a locked crack and validated using pre-tested cracked aluminum panels. Various finite element analyses are conducted to account for different crack geometries. The developed FEM provides an estimation of the loss in load-carrying capacity, which can support decision-making regarding the repair of locked cracks in aluminum panels.
Article
Chemistry, Analytical
Flavius Pop, Bernard Herrera, Cristian Cassella, Matteo Rinaldi
Summary: This paper presents a novel approach to increase the transmitting sensitivity of piezoelectric micromachined ultrasonic transducer arrays and directly modulate digital information on the same device. The direct modulation system achieves higher signal-to-noise ratio and communication range, while consuming less energy compared to traditional continuous wave drive. The increased performance is achieved through a switching circuit that allows for a high-AC voltage on the ultrasonic array, making it CMOS-compatible and serving as both modulation for the data itself.
Article
Engineering, Aerospace
Andre F. P. Ribeiro, Carlos Ferreira, Damiano Casalino
Summary: This study compares a filament-based free wake panel method to experimental and validated numerical data in order to simulate propeller slipstreams and their interaction with aircraft components. The results show that the free wake panel method is able to successfully capture the slipstream deformation and shearing, making it a useful tool for propeller-wing interaction in preliminary aircraft design.
AEROSPACE SCIENCE AND TECHNOLOGY
(2024)