Review
Environmental Sciences
Guan Chen, Yicheng Ye, Nan Yao, Fanghui Fu, Nanyan Hu, Zhen Zhang
Summary: Uniaxial compression tests were conducted on cemented backfill with different particle size gradations to study the effect of backfill aggregate particle size on compressive strength and failure mode. The damage evolution mechanism of cemented backfill with different particle size gradations was discussed by analyzing the characteristics of acoustic emission during the failure process.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2022)
Article
Construction & Building Technology
Yihong Zhou, Huawei Zhou, Tingcai Chen, Chao Hu, Zhipeng Liang, Chunju Zhao, Fang Wang
Summary: In this study, an intelligent detection method for rockfill gradation based on video image recognition technology is proposed and applied to engineering applications. The proposed method shows high efficiency, accuracy, and robustness in laboratory tests and engineering applications, and outperforms the traditional screening and video image recognition methods.
AUTOMATION IN CONSTRUCTION
(2023)
Article
Construction & Building Technology
Jiangyu Wu, Qian Yin, Hongwen Jing, Hai Pu, Yuan Gao, Jingmin Xu
Summary: Investigating the ultrasonic properties of cemented rockfill and constructing predictive models based on genetic algorithm can accurately predict its strength. The optimal CNT dosage and aggregate size distribution can be determined through these models, improving the accuracy of strength prediction for cemented backfill.
CONSTRUCTION AND BUILDING MATERIALS
(2021)
Article
Construction & Building Technology
Haoyue Fan, Zhenghong Tian, Xiaobin Xu, Xiao Sun, Yuanshan Ma, Hengrui Liu, Hao Lu
Summary: This paper proposes a gradation detection method based on deep learning, which can output detection results end-to-end. The method utilizes a modified MASK R-CNN model to locate and segment rockfill materials. The results show that the proposed method has high accuracy and can quickly obtain the gradation of rockfill materials.
CASE STUDIES IN CONSTRUCTION MATERIALS
(2022)
Article
Engineering, Geological
Dongjie Xue, Lan Lu, Lie Gao, Lele Lu, Cheng Chen
Summary: This study indirectly reconstructs the spatial correlation of fracture network using acoustic emission signal cloud and establishes a cube cluster approach to describe fracture evolution, confirming the sensitivity of the method to dilatancy behavior and the potential for calculating fracture angle.
JOURNAL OF ROCK MECHANICS AND GEOTECHNICAL ENGINEERING
(2021)
Article
Engineering, Geological
Wan-li Guo, Ge Chen
Summary: This paper investigates particle breakage in rockfill during shearing. By using a reduction strategy for the friction coefficient, a method to estimate the breakage energy is developed. The results show that the particle breakage indices and fractal dimension are proportional to the breakage energy.
Article
Construction & Building Technology
Huafu Qiu, Fushun Zhang, Lang Liu, Chao Huan, Dongzhuang Hou, Wei Kang
Summary: Experimental tests were conducted on the acoustic emission characteristics of cemented tailings backfill under uniaxial compression with different cement-sand ratios and waste rock contents. The results showed that an increase in waste rock content affected the mechanical properties of the backfill body, and the cement-sand ratio and waste rock content had a significant impact on the mechanical properties of the backfill body.
CONSTRUCTION AND BUILDING MATERIALS
(2022)
Article
Engineering, Geological
Ke Wang, Hongjie Tang, Rui Wang, Jian-Min Zhang
Summary: A practical nonlinear elastic EBD constitutive model is developed to connect the stress-strain behavior of rockfill material with dam deformation. The traditional EB model has difficulties in simulating settlement and horizontal displacement of rockfill dams, whereas the EBD model can simulate both well. Moreover, the EB model parameters that achieve acceptable simulation of dam deformation result in poor simulation of element level stress-strain behavior, whereas the EBD model can achieve good simulation of both dam deformation and element level stress-strain behavior simultaneously.
Article
Construction & Building Technology
Xizhi Zhang, Di Wu, Hu Lu, Liang Liu, Shilong Zheng
Summary: This study aims to optimize the particle size distribution of tailings used in Cemented Tailings Backfill (CTB) by using hydraulic cyclone, which can significantly improve the workability and strength of CTB. The optimal value of tailings grading is found to be 50%. This study is expected to contribute to improving CTB performance by optimizing the tailing grain composition using hydraulic cyclone.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Article
Mining & Mineral Processing
Dongjie Xue, Zepeng Zhang, Cheng Chen, Jie Zhou, Lan Lu, Xiaotong Sun, Yintong Liu
Summary: The cube-cluster model effectively describes the spatial correlation of scattering AE events in a granite sample under triaxial compression, allowing for the analysis of fracture network and quantitative evaluation of fracture angle evolution. Additionally, it provides a potential possibility to predict the evolution of fracture angle.
INTERNATIONAL JOURNAL OF MINING SCIENCE AND TECHNOLOGY
(2021)
Article
Environmental Sciences
Yuxin Hao, Xuepeng Song, Yucheng Huang, Bao Zhang, Zilin Dong, Hao Wang
Summary: This paper analyzes the damage evolution of cemented paste backfill (CPB) under different loading rates using indoor tests and numerical simulations. The moment tensor theory is introduced to simulate the acoustic emission (AE) characteristics during the loading process, and the energy conservation principle is used to explore the loading rate (LR) effect on the backfill. The results show that the uniaxial compressive strength (UCS) of the backfill first increases and then decreases as LR increases. Microcracks in the backfill slowly increase and are not significantly affected by LR until after the peak value, when they rapidly expand and propagate to form mesoscopic cracks. The temporal and spatial distribution of AE events based on the moment tensor theory are consistent with laboratory test results, and they can be divided into different periods. The characteristics of AE events are also consistent with the evolution of microcracks, with fewer events before the peak value and a significant increase in magnitude and frequency after the peak value. AE events dense zone and events with larger magnitudes increase under higher LR. Furthermore, the boundary energy and dissipation energy gradually increase, while the strain energy first increases and then decreases. These findings provide insights into the damage evolution characteristics of backfill under different LR and AE mesoscopic simulation.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2022)
Article
Chemistry, Physical
Liuxu Fu, Yubo Jiao, Xianhua Chen, Mengsu Zhang
Summary: Different aggregate gradations of asphalt concrete exhibit diverse damage characteristics, and acoustic emission technology enables real-time monitoring of the damage evolution process. The combination of AE parameters and cumulative AE parameters accurately characterizes the damage characteristics of asphalt concrete. SMA specimens show the best overall performance among different aggregate gradations at different temperatures.
Article
Construction & Building Technology
Tong Chen, Kang Zhao, Yajing Yan, Yun Zhou, Zhiwei He, Lijie Guo
Summary: This study investigated the mechanical properties and acoustic emission (AE) response of cemented tailings backfill (CTB) under compression-shear action. The results show that as the shear angle increases, the peak stress and plastic yield stage decrease, damage evolution is accelerated; the AE ringing counts and energy evolution exhibit specific distribution patterns; the crack evolution mode of the specimen changes with the shear angle. This has important implications for analyzing the rupture evolution of CTB under different compression-shear angles and the stability analysis of CTB backfilled goaf.
CONSTRUCTION AND BUILDING MATERIALS
(2022)
Article
Construction & Building Technology
Gaili Xue, Erol Yilmaz
Summary: This research develops an efficient acoustic emission technique to study the strength, acoustic and fractal characteristics of fiber reinforced CTB materials. The study finds that polypropylene provides the best fiber reinforcement influence.
CONSTRUCTION AND BUILDING MATERIALS
(2022)
Article
Construction & Building Technology
Guan Chen, Nan Yao, Yicheng Ye, Fanghui Fu, Nanyan Hu, Zhen Zhang
Summary: The effects of waste rock (WR) contents on the delamination and mechanical characteristics of cemented backfill were studied. It was found that the viscosity and yield stress of the filling slurry decreased with increasing WR content, resulting in more obvious settlement and delamination. The uniaxial compressive strength (UCS) exhibited a similar trend to the stacking density of the mixed aggregate, with the highest UCS observed at a WR content of 60%. Moreover, the content of hydration products in the cemented backfill affected its cementation properties and compressive strength.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Article
Acoustics
Maxwell J. Kiernan, Rashid Al Mukaddim, Carol C. Mitchell, Jenna Maybock, Stephanie M. Wilbrand, Robert J. Dempsey, Tomy Varghese
Summary: In this study, a method for automatically determining bounding boxes and lumen segmentation using a Mask R-CNN network trained on sonographer assisted groundtruth carotid lumen segmentations is presented. This method is of great importance for analyzing ultrasound images that require time and labor, and it also lays the foundation for developing accurate plaque segmentation and wall thickness measurement methods.
Article
Acoustics
Junzhen Wang, Jianmin Qu
Summary: This article presents the solution to guided wave fields in a double-layer plate and proposes a nonlinear spring-interface model for the bonding between the two sublayers. The study finds that the nonlinearity of the spring-interface can generate resonant guided waves in the double-layer plate, providing a theoretical foundation for the development of nondestructive evaluation techniques using nonlinear guided waves.
Article
Acoustics
Shuyuan Ye, Tianyu Peng, Zhili Long, Zhiming Jiang, Xiangqing Li, Zhonghua Cao
Summary: In this study, a novel approach based on beating vibration model is proposed for frequency tracking, which accurately determines the resonant frequency of the transducer in a short time.
Article
Acoustics
Shuling Gao, Rui Zhang, Zheng Fan, Ning Li, Yanan Yue, Lili Xie
Summary: In this study, a novel method is proposed to monitor fatigue damage in welded joints by computing the energy density in the diffuse ultrasonic signal. The results indicate that the correlation coefficient of the energy density exhibits a significant decreasing trend when crack initiation occurs, providing a unique signal to indicate crack initiation in welded joints.
Article
Acoustics
Ata Jafarzadeh, Peter D. Folkow, Anders Bostrom
Summary: This study investigates the scattering of elastic waves by an anisotropic sphere with orthorhombic symmetry inside an isotropic medium, and applies it to the characterization of polycrystalline materials with anisotropic grains. The expansion coefficients of the wave and displacement field are determined inside the sphere using recursion relations and boundary conditions. The T matrix elements are then obtained and used to analyze the attenuation and phase velocity of polycrystalline materials, particularly at low frequencies. The proposed approach shows good agreement with previous results and finite element method for strongly anisotropic materials.
Article
Acoustics
F. R. Akhmedzhanov, M. I. Elboeva, S. Z. Mirzaev
Summary: The dependence of elastic and acousto-optic properties on the direction of wave vector and polarization of acoustic and optical waves in lead molybdate crystals has been investigated. Effective photoelastic constants were determined using the Dixon method for different geometries of Bragg light diffraction. The study of the acousto-optic quality factor dependence on the direction of the wave vector of longitudinal acoustic waves in the symmetry plane revealed that the maximum and minimum values are observed when light is diffracted by pure longitudinal waves in this plane. Additionally, it was found that the acousto-optic quality factor in lead molybdate crystals is practically the same as in paratellurite crystals.
Article
Acoustics
H. Franklin
Summary: This paper investigates the interaction between double porosity distributed cylindrical bodies and the surrounding fluid using a generalized self consistent method. The study reveals that there is a correlation between the propagating waves and the effective quantities at low frequencies, which is influenced by the volume fraction of scatterers and the porosity.
Article
Acoustics
Yuchen Liu, Mahshid Hafezi, Andrew Feeney
Summary: This study investigates the use of Nitinol, a shape memory alloy, in a Langevin power ultrasonic transducer to mitigate the influence of temperature on device performance. The results demonstrate that by controlling the microstructure of Nitinol, the nonlinear softening of the piezoelectric stack can be reduced, leading to higher and more stable vibration amplitudes. Furthermore, the use of Nitinol allows for stable resonance frequency and performance even with temperature changes and continuous operation.
Article
Acoustics
Shrutika Sharma, Vishal Gupta, Deepa Mudgal
Summary: Poly Lactic Acid (PLA) based bone plates fabricated using Fused Deposition Modeling can have improved mechanical strength by biocompatible polydopamine (PDM) coating. The effect of ultrasonic assisted coating parameters on tensile strength of coated bone plates was investigated and compared using Response Surface Methodology (RSM) and machine learning (ML) models. The gradient boosting regression (GBReg) model outperformed other models in terms of accuracy and prediction performance for predicting the tensile strength of PDM coated bone plates.
Article
Acoustics
Kirill Kolesnik, Vijay Rajagopal, David J. Collins
Summary: Superstrate-based acoustofluidic devices offer advantages of cost, interchangeability and prevention of contamination between samples. This study analyzes the coupling layers and superstrate dimensions for efficient sound transmission, finding that a superstrate thickness of 0.55 times the acoustic wavelength maximizes acoustic coupling.
Article
Acoustics
Dingpeng Wang, Xiaocen Wang, Shili Chen, Jian Li, Lin Liang, Yang Liu
Summary: This paper proposes an end-to-end ultrasonic guided wave joint learning imaging method for sparse and limited-view transducer arrays, which significantly improves the quality of imaging results by integrating sparse feature reconstruction and deep learning imaging methods.
Article
Acoustics
Zubeir M. Ebrahim Saib, Anthony J. Croxford, Bruce W. Drinkwater
Summary: This paper proposes a numerical model using FDTD scheme to solve the nonlinear elastic bulk wave equations, aiming to better understand nonlinear ultrasonic techniques. The model considers material and geometrical nonlinearities and uses a stress-type boundary condition for excitation. Simulation and experimental results validate the effectiveness of the model.
Article
Acoustics
Sol R. Martinez, Emmanuel Odella, Luis E. Ibarra, Arianna Sosa Lochedino, Ana B. Wendel, Andres M. Durantini, Carlos A. Chesta, Rodrigo E. Palacios
Summary: Sonodynamic inactivation (SDI) has an advantage over optical excitation-based protocols due to the deeper penetration of ultrasound (US) excitation. In this study, we applied conjugated polymer nanoparticles (CPNs) as an efficient sonosensitizer (SS) in SDI of pathogens and characterized the sonoreactor. We found that CPNs have a germicidal effect on planktonic cultures and mature biofilms, highlighting their potential for novel inactivation protocols.
Article
Acoustics
Quentin Baudis, Tony Valier-Brasier, Regis Wunenburger
Summary: In this study, we present a detailed procedure for measuring the rheological properties of soft, highly attenuating, visco-elastic materials at ultrasonic frequencies. We use a crosslinked Polyurethane (PU) elastomer as an example and determine its complex longitudinal modulus M and shear modulus G as a function of frequency and temperature. The results show that M, G, and bulk modulus K obey the time-temperature superposition principle and can be accurately described using a fractional derivative rheological model.
Article
Acoustics
Richard E. Jacob, Matthew S. Prowant, Chris A. Hutchinson
Summary: Ultrasonic inspection of cast austenitic stainless steel (CASS) in the nuclear industry is challenging due to sound field scatter and attenuation caused by the coarse-grained microstructure. Modeling and simulation are important tools for addressing key aspects of inspections, but developing a useful and reliable CASS model is challenging. This study demonstrates a method of creating a realistic CASS model and compares it with laboratory-measured sound fields, showing promising results.