Article
Materials Science, Multidisciplinary
Xiao Wang, Xiqiang Ma, Mian Zhang, Yuanyuan Huang, Zhiqiang Guan, Jishun Li
Summary: In recent years, research has focused on selecting appropriate parameters for ore crushing technology to achieve optimal distributions of particle sizes and improve mineral separation efficiency. The discrete element method (DEM) is an effective numerical simulation method for studying mineral crushing processes. This paper proposes methodologies for selecting particle sizes and inter-particle bond energy based on drop weight tests conducted in the laboratory. The results show that the modeling technique proposed in this paper accurately represents the crushing characteristics of ore materials and improves the accuracy of DEM simulations, laying the foundation for guiding the selection of grinding process parameters and mill equipment.
Article
Mechanics
Lifu Yang, Madura Pathirage, Huaizhi Su, Mohammed Alnaggar, Giovanni Di Luzio, Gianluca Cusatis
Summary: This study investigates the effects of size range, distribution, and content of reactive aggregate on concrete expansion and deterioration due to Alkali-Silica Reaction (ASR) using the Lattice Discrete Particle Model within a Multiphysics framework. The model is extended to include a piecewise linear sieve curve for selecting reactive and non-reactive coarse aggregate pieces. Simulation results show that ASR-induced cracks are mainly caused by reactive aggregates of different sizes, leading to heterogeneous expansion and loss in mechanical properties. The competition between porosity and diffusion effects in the ASR model explains the phenomenon of the so-called pessimum size of ASR expansion.
INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES
(2022)
Article
Engineering, Geological
Yoshiro Huillca, Matias Silva, Carlos Ovalle, Juan Carlos Quezada, Sergio Carrasco, Gabriel Eduardo Villavicencio
Summary: Empirical evidence suggests that particle breakage affects the mechanical behavior of granular materials, particularly coarse rockfill materials. The study utilizes a multi-scale approach with the discrete element method to investigate the correlation between particle size and strength, revealing a decrease in particle strength as size increases.
Article
Engineering, Chemical
Payam Asadi, Ali Fakhimi
Summary: This study examines the combined influence of loading rate and particle size on the compressive and tensile strengths of rock using a computer program. The results show that particle size does not affect rock strength under static and dynamic loading, but it does modify the nominal tensile strength of notched Brazilian specimens. Particle size contributes to the tensile strength of intact Brazilian specimens at high stress rates, which can be justified based on the principles of fracture mechanics.
ADVANCED POWDER TECHNOLOGY
(2023)
Article
Nanoscience & Nanotechnology
Chiara Morano, Nao Terasaki, Tianyi Gao, Gilles Lubineau, Marco Alfano
Summary: We investigate the mechanics of crack propagation in adhesive joints inspired by the base plate of the barnacle Amphibalanus amphitrite. The joints feature buried hollow cylindrical channels that modulate the strain energy release rate (ERR) and enable a crack-tip shielding mechanism. Finite element simulations and experiments validate the occurrence of crack pinning/depinning cycles. Mechanoluminescent (ML) coating is used to study the transient stress field in the crack tip region, revealing details of snap-through cracking in the bio-inspired adhesive joints.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Engineering, Environmental
Fanyuhui Yan, Peng Zhu, Shuangfei Zhao, Jinyu Shi, Yunfei Mu, Huanming Xia, Ruiqi Shen
Summary: A microfluidic crystallization system (MCS) was proposed in this study to control and optimize the crystallization environment of polymer bonded explosives (PBXs), resulting in PBXs with narrow particle size distribution and high crystal quality. Furthermore, the anti-overload performance of four different PBXs was evaluated through air gun experiments, confirming their stability under strong external dynamic load conditions.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Chemistry, Physical
Zhitang Fang, Wanyun Li, Bangchuan Zhao, Jin Bai, Kunzhen Li, Hongyang Ma, Xuebin Zhu, Yuping Sun
Summary: A series of Li-rich Mn-based layered materials with different particle sizes and distributions were successfully synthesized, showing enhanced electrochemical performance due to the unique particle size and PSD, especially at high current rates. The material displayed excellent lithium storage properties at high temperatures and full cells using this material as the cathode showed improved electrochemical performance.
ACS APPLIED ENERGY MATERIALS
(2021)
Article
Engineering, Geological
Kui Zhao, Wenkai Wu, Peng Zeng, Daoxue Yang, Yongguang Liu, Li Wang, Shanhu Ran
Summary: The study investigates the measurement of rock fracture toughness using the CCNBD method and explores the micro-crack evolution mechanism of non-uniform sandstone through numerical simulation. The results indicate that the evolution of micro-cracks is significantly influenced by the sandstone particle size and mineral composition.
ROCK MECHANICS AND ROCK ENGINEERING
(2021)
Article
Engineering, Civil
Mojtaba Shirzehhagh, Ali Fakhimi
Summary: The failure mechanism of reinforced concrete beams without stirrups is studied in this paper, using a new numerical approach based on discrete elements. The model is validated through four-point bending experiments, showing its capability to capture key features of the beams' behavior.
ENGINEERING STRUCTURES
(2021)
Article
Materials Science, Composites
Zhiqiang Xu, Feng Chen, Xiaodong Wang, Kewen Chen, Zhifa Tang, Xinqian Bo, Shengqiang Jiang
Summary: This study focuses on the additive manufacturing of bonded magnets using different particle sizes of flake NdFeB powder. The performance of 3D-printed bonded magnets was characterized and it was found that magnets with a volume-weighted mean diameter (VMD) less than 10 μm showed excellent mechanical strength, but decreased ductility as VMD decreased.
POLYMER COMPOSITES
(2022)
Article
Food Science & Technology
Cathrina H. Edwards, Peter Ryden, Giuseppina Mandalari, Peter J. Butterworth, Peter R. Ellis
Summary: This study compared the digestion kinetics of chickpea and durum wheat with different cell wall structures, revealing a cell wall barrier mechanism that may underpin the health effects of dietary fiber. Food processing can disrupt the structure of plant cell walls, affecting starch bioaccessibility.
Article
Mechanics
M. Ciavarella, A. Papangelo
Summary: This study presents simple results for crack propagation in finite size specimens of viscoelastic materials, including the maximum velocity at which a crack may become unstable and the reduction in toughness enhancement compared to infinite systems. Different theories predict qualitative differences, with some suggesting instability while others propose stability without amplification beyond that of infinite systems. Further clarification of these differences is needed for future research.
ENGINEERING FRACTURE MECHANICS
(2021)
Article
Construction & Building Technology
Yan Chen, Jiangfan Yang, Meiheng Li, Lei Zhou, Baohua Guo, Jianping Zuo
Summary: In this paper, laboratory direct shear tests and acoustic emission tests are conducted to analyze the shear properties of bonded rock-concrete interfaces. The results show that increasing roughness enhances brittleness and peak dilatancy characteristics, but the residual shear strength exhibits the opposite trend. The AE tests demonstrate the occurrence of peak AE energy and count generation during shear failure, and the evolution of the AE-b value indicates the repeated conversion between large and small-scale micro-cracks.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Article
Chemistry, Analytical
Xianjun Li, Jinsong Yang, Guangdong Zhang
Summary: This paper presents a new crack size quantification method based on high-resolution Lamb waves, using optimal excitation waveform and signal processing methods. Through simulations and validation experiments, it is proven that this method can improve crack detection resolution.
Article
Materials Science, Multidisciplinary
Himanshu Kumar, Shan Huang, Guoxiong Mei, Ankit Garg
Summary: Biochar, a stable carbon material with a lifespan of over 500 years, has been proposed as an eco-friendly solution to reduce cracking in soil. The type of biochar and its particle size can impact crack formation, with wood-based biochar proving more effective than pig manure-based biochar in reducing cracks. Fine-grained biochar is more susceptible to crack formation, regardless of the type.
INTERNATIONAL JOURNAL OF DAMAGE MECHANICS
(2021)
Article
Engineering, Geological
Xiao-Ping Zhang, Quansheng Liu, Shunchuan Wu, Xuhai Tang
ENGINEERING GEOLOGY
(2015)
Article
Engineering, Geological
Xiao-Ping Zhang, Shunchuan Wu, Lekan Olatayo Afolagboye, Sijing Wang, Gengyou Han
ROCK MECHANICS AND ROCK ENGINEERING
(2016)
Article
Geochemistry & Geophysics
Yi Cheng, Louis Ngai Yuen Wong
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2018)
Article
Engineering, Environmental
Xiao-Ping Zhang, Louis Ngai Yuen Wong, Sijing Wang
BULLETIN OF ENGINEERING GEOLOGY AND THE ENVIRONMENT
(2015)
Article
Geochemistry & Geophysics
Louis Ngai Yuen Wong, Qiquan Xiong
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2018)
Article
Geochemistry & Geophysics
Yahui Zhang, Louis Ngai Yuen Wong, Ka Kit Chan
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2019)
Article
Multidisciplinary Sciences
Fanzhen Meng, Louis Ngai Yuen Wong, Hui Zhou
SCIENTIFIC REPORTS
(2019)
Article
Geochemistry & Geophysics
Louis Ngai Yuen Wong, Ahui Zhang
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2019)
Article
Engineering, Geological
Yi Cheng, Louis Ngai Yuen Wong
INTERNATIONAL JOURNAL FOR NUMERICAL AND ANALYTICAL METHODS IN GEOMECHANICS
(2020)
Article
Engineering, Geological
Zhihuan Li, Louis Ngai Yuen Wong, Cee Ing Teh
ROCK MECHANICS AND ROCK ENGINEERING
(2020)
Article
Engineering, Geological
Jun Peng, Louis Ngai Yuen Wong, Yahui Zhang
Summary: The aggregation of a group of pore-like flaws significantly influences the strength, deformation properties, and microcracking process of crystalline rock. As the number of pores increases, the uniaxial compressive strength and elastic modulus of the rock decrease. Randomly distributed pores cause more uniformly distributed stress and smaller tension zone in numerical models compared to regularly assembled pores. The position of pore-like flaws has negligible influence on the strength and deformation behavior, while the UCS increases progressively with the radius of the pore-like flaw.
INTERNATIONAL JOURNAL FOR NUMERICAL AND ANALYTICAL METHODS IN GEOMECHANICS
(2021)
Article
Engineering, Geological
Xin Cui, Louis Ngai Yuen Wong
Summary: Previous studies have shown that 3D wing cracks can extensively propagate under biaxial compression, while their propagation is somehow restricted under uniaxial compression. In this study, a numerical model is developed to simulate the propagation of 3D wing cracks, and it is found that intermediate principal stress plays a key role in triggering extensive propagation.
ROCK MECHANICS AND ROCK ENGINEERING
(2023)
Article
Engineering, Geological
Yimeng Zhou, Louis Ngai Yuen Wong, Keith Ki Chun Tse
Summary: Rock classification is important for geosciences and geological engineering practices. This study develops and implements a convolutional neural network (CNN) called HKUDES_Net to classify seven different rock types. HKUDES_Net outperforms other CNNs and machine learning algorithms in terms of prediction accuracy.
ROCK MECHANICS AND ROCK ENGINEERING
(2023)
Retraction
Engineering, Geological
Yimeng Zhou, Louis Ngai Yuen Wong, Keith Ki Chun Tse
ROCK MECHANICS AND ROCK ENGINEERING
(2023)
Article
Computer Science, Interdisciplinary Applications
Xiao-ping Zhang, Qi Zhang, Shunchuan Wu
COMPUTERS AND GEOTECHNICS
(2017)
