Article
Acoustics
Max Gattin, Nicolas Bochud, Giuseppe Rosi, Quentin Grossman, Davide Ruffoni, Salah Naili
Summary: Multi-material additive manufacturing is being increasingly explored for designing micro-architectured periodic media with programmable ultrasonic responses. This study investigates the transmission of longitudinal ultrasound waves through 1D-periodic biphasic media composed of viscoelastic materials. The relative contributions of viscoelasticity and periodicity on ultrasound signatures are disentangled using Bloch-Floquet analysis. Modeling outcomes are compared with experimental results to shed light on the complex acoustic behavior of periodic media in the ultrasonic regime.
Article
Engineering, Chemical
Pratanu Roy, Stephen T. Castonguay, Jennifer M. Knipe, Yunwei Sun, Elizabeth A. Glascoe, Hom N. Sharma
Summary: This work explores the modeling and characterization of diffusive moisture transport coupled with kinetic Langmuir adsorption in a multi-material system. The finite volume method with an implicit Euler time-stepping scheme is used to solve the coupled unsteady diffusion-sorption equations. A level set framework with a smoothed Heaviside function is employed to handle moisture concentration and flux conditions at material interfaces, allowing for the simulation of complex 3D shapes.
CHEMICAL ENGINEERING SCIENCE
(2022)
Article
Engineering, Environmental
Pengcheng Zhao, Yuguo Li
Summary: In this study, a new physical model was proposed to evaluate microbial transfer rates in finger-surface touch based on important physical factors. Experimental data were found to be more consistent with model predictions, providing new insights for future research.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2021)
Article
Engineering, Mechanical
Pengpeng Yu, Liang Wang, Shiyu Zhang, Jiamei Jin
Summary: In this paper, a new modeling method for forked piezoelectric actuators is developed using the transfer matrix method, and its correctness is validated through a case study. The research results demonstrate that the forked connection can transform the vibration direction and realize amplitude amplification.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2022)
Article
Engineering, Mechanical
Liang Wang, Fushi Bai, Viktor Hofmann, Jiamei Jin, Jens Twiefel
Summary: A novel traveling wave sandwich piezoelectric transducer with a single-phase drive is proposed in this study to overcome the limitations of traditional transducers. An analytical model is developed and experimental results confirm the feasibility and effectiveness of the proposed transducer in various applications.
CHINESE JOURNAL OF MECHANICAL ENGINEERING
(2021)
Article
Thermodynamics
Jianhong Kang, Jipeng Zhu, Youpai Wang, Fubao Zhou, Yingke Liu
Summary: In this study, a coupled gas diffusion and heat conduction model was developed to investigate the dynamical process of heat and mass transfer in coal matrix. The results revealed that heat transfer significantly influences gas desorption behavior, and the thermal boundary conditions affect the temperature and concentration distributions. The coupled model provides a more accurate description of gas desorption compared to the uncoupled diffusion model.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2022)
Article
Engineering, Mechanical
Le Wang, Liang Wang, Yuyang Lin, Xiaolong Lu, Chunsheng Zhao
Summary: A novel ultrasonic motor proposed in this paper overcomes the specific requirements on piezoelectric ceramics in traditional motors, and an electromechanical model utilizing the transfer matrix method is built for dynamic behavior analysis. Experimental results confirm the feasibility of the motor design.
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2021)
Article
Engineering, Mechanical
Fabio Caruso, Giacomo Mantriota, Vincenzo Moramarco, Giulio Reina
Summary: The ability to control and tune the stiffness of soft structures is a critical challenge in soft robotics. While layer jamming offers a promising solution, the existing analytical models are unable to accurately describe the behavior of these structures beyond initial deformation. This study proposes an analytical model that predicts the behavior of layer jamming structures in all deformation phases and addresses the limitations of existing models. Experimental tests and finite element simulations are conducted to validate the predictions of the proposed model, confirming its accuracy and providing insights into the effect of design parameters.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2023)
Article
Energy & Fuels
Wei Yu, Xianmin Zhou
Summary: The geometric confinement has a significant impact on the foam coarsening dynamics in porous media. This study presents experimental and modeling research on coarsening-induced foam structural evolution in a porous microfluidic chip. The findings provide insights for predicting the foam structure in various applications, such as foam-assisted enhanced oil recovery and CO2 geological sequestration. The coarsening of edge bubbles dominates the foam coarsening process, and a mass transfer model is proposed to fit the coarsening rate of edge bubbles.
FRONTIERS IN ENERGY RESEARCH
(2022)
Article
Acoustics
Wendan Yang, Hong Xia, Qing-Qing Ni
Summary: This research presented a novel multi-band sound-absorbing device called double cavity resonant device (DCRD) that achieved higher sound absorption performance compared to the traditional Helmholtz resonance structure. The DCRD incorporated a double resonant structure with porous abrasive material and a microperforated panel, forming a new sound-absorption structure with two air cavities. The absorption coefficients of each component were discussed to explain the sound absorption parameters and mechanism of the DCRD. The findings demonstrated the potential for optimizing noise reduction, particularly for low-frequency sounds, through a flexible design approach without increasing the size of the structure.
Article
Multidisciplinary Sciences
Wang Xi, Yun-Jo Lee, Shilv Yu, Zihe Chen, Junichiro Shiomi, Sun-Kyung Kim, Run Hu
Summary: There is an increasing demand for multispectral camouflage technologies, especially in the visible and infrared bands. However, designing proper materials and structures for VIS-IR camouflage is still challenging due to the need for selective spectra over a large wavelength range and adaptability to flexible color and infrared signals. In this study, a material-informatics-based inverse design framework is proposed to efficiently design multilayer germanium (Ge) and zinc sulfide (ZnS) metamaterials. The designed metamaterials demonstrate excellent color matching and infrared camouflage performance in various observation conditions, as confirmed by simulations and experiments. This material informatics inverse design framework is highly efficient and has the potential for broader applications beyond multispectral camouflage.
NATURE COMMUNICATIONS
(2023)
Article
Mechanics
Anil Kumar Vashishth, Umang Bareja
Summary: This study focuses on the propagation of Love waves in a composite structure consisting of piezoelectric layers and a functionally graded porous piezoelectric material (FGPPM) layer. The effects of porosity, wavenumber, and gradation on the phase velocity and group velocity of Love waves are investigated. The study also examines the variations of attenuation and electromechanical coupling factor with grading parameters and porosity. Numerical computations are conducted to analyze the mechanical and electrical displacement, stress, and attenuation. The findings provide valuable insights for improving the efficiency of surface acoustic wave (SAW) devices.
EUROPEAN JOURNAL OF MECHANICS A-SOLIDS
(2023)
Article
Construction & Building Technology
Yu-Ling Yang, Tao Zhang, Krishna R. Reddy, Jiang-Shan Li, Song-yu Liu
Summary: Scrap tire rubber can be reused with soils as a sustainable construction material. This study investigates the thermal behavior of the rubber-sand composite for insulation in thermo-active applications. The results show that adding shredded tires reduces the thermal conductivity of sand, indicating the potential of using recycled scrap rubber tires in insulation layers.
CONSTRUCTION AND BUILDING MATERIALS
(2022)
Article
Materials Science, Ceramics
Sheng Zhang, Yuchun Feng, Xiguang Gao, Yingdong Song, Fang Wang, Shirong Zhang
Summary: The fatigue failure of ceramic matrix composites at elevated temperatures was predicted using micro-mechanics method, and the accuracy of the predicted results was validated through multi-scale experiments.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2022)
Article
Materials Science, Composites
Debabrata Adhikari, Suhasini Gururaja, Santosh Hemchandra
Summary: The study established the relationship between compaction pressure and fiber volume fraction through compression tests and characterized in-plane permeability using different thicknesses of carbon fiber fabric. By developing a pressure data acquisition system and measurement setup, vacuum infusion experiments were successfully conducted, and the numerical model predictions were validated with experimental results.
JOURNAL OF REINFORCED PLASTICS AND COMPOSITES
(2021)
