Article
Engineering, Multidisciplinary
Xiaoping Zhang, Qi Zhang, Quansheng Liu, Ruihua Xiao
Summary: Aftershocks following an earthquake play a significant role in earthquake-induced landslides. This study found that seismic loading induced cracks with purely tensile characteristics, and crack propagation occurred only when the seismic loading direction changed.
Article
Chemistry, Physical
Weilong Ai, Billy Wu, Emilio Martinez-Paneda
Summary: This study develops a multi-physics phase field fatigue model to study crack propagation in battery electrode particles. By coupling with X-ray CT imaging, fatigue cracking of realistic particle microstructures is simulated. Non-linear crack propagation behavior is predicted, with an exponential increase in cracked area observed with cycle number. Three stages of crack growth and phenomena such as crack initialization at concave regions and crack coalescence are observed. The critical values of C-rate, particle size, and initial crack length are determined.
JOURNAL OF POWER SOURCES
(2022)
Article
Engineering, Geological
Aya Rima, Cecile Oliver-Leblond, Frederic Ragueneau
Summary: This paper presents a new method for detecting contact between polygonal particles in the beam-particle model. The algorithm is based on a multi-circle approach which efficiently detects contact between particles with complex shapes. The results show that the proposed contact detection procedure is faster and more accurate compared to the polygonal approach.
INTERNATIONAL JOURNAL FOR NUMERICAL AND ANALYTICAL METHODS IN GEOMECHANICS
(2023)
Article
Computer Science, Interdisciplinary Applications
Chao-Sheng Tang, Qing Cheng, Luan Lin, Ben -Gang Tian, Hao Zeng, Bin Shi
Summary: This study used a digital camera to record the dynamic process of soil desiccation cracking and analyzed the relationship between the strain/displacement field and cracking using image processing techniques. The results showed that cracking usually occurs at locations with high tensile strain and that the surrounding strain and displacement fields rapidly redistribute after crack formation.
COMPUTERS AND GEOTECHNICS
(2022)
Article
Geochemistry & Geophysics
Wen Zhang, Yan-yu Chen, Jin-ping Guo, Sai-sai Wu, Cheng-yuan Yan
Summary: This study investigates the internal and external crack propagation processes of red sandstone under triaxial compression through experimental tests and numerical simulations. CT scanning technology is used to observe the crack state of the specimens. The results indicate that internal cracks in red sandstone first occur at the end of the specimen and eventually accumulate and expand to form a macroscopic oblique shear failure under the combined action of axial stress and confining pressure.
Article
Materials Science, Multidisciplinary
Ruoyu Guan, Shean Bie, Canpeng Chen
Summary: This paper investigates the application of the discrete element method in simulating discontinuous block systems and proposes a new method for deriving stress values. By recovering the stress field, the stress distribution in continuous materials can be more accurately described.
ACTA MECHANICA SOLIDA SINICA
(2021)
Article
Astronomy & Astrophysics
Vladimir Dzhunushaliev, Vladimir Folomeev, Burkhard Kleihaus, Jutta Kunz
Summary: This paper presents a new model describing rapidly rotating neutron stars with wormholes in their centers. The model is based on general relativity and the presence of a ghost scalar field. The nuclear matter is described by a polytropic equation of state, resulting in realistic masses and radii for the neutron stars. The wormholes have small circumferential radii, up to 3 km. As the size of the wormhole increases, the masses and radii of the stars decrease, while the existence domain of these rotating mixed neutron-star-plus-wormhole systems retains the characteristic properties of a rotating neutron star domain. The question of stability of the mixed configurations under consideration is briefly discussed.
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
Mathematics, Interdisciplinary Applications
Kolja Jarolin, Maksym Dosta
Summary: Two methods for calibrating elastic material parameters of bonded-particle models are proposed in this work, based on classical mechanics principles. These methods allow for faster calibration than traditional trial and error strategies and can be used to check the consistency of the models. The first method linearizes the mathematical model and solves it in a matrix-vector formulation, while the second method further linearizes to calculate the elastic stiffness tensor directly, reducing computational costs significantly. Application of these methods in three case studies showed a significant reduction in calculation time.
COMPUTATIONAL PARTICLE MECHANICS
(2021)
Article
Engineering, Mechanical
Yusong Zhao, Binglei Li, Shunchuan Wu, Long Chen
Summary: This study uses discrete element numerical simulation to reproduce laboratory tests and investigate the impact of preset flaws on rock fracture. The results show that a 2D preset flaw strongly influences the surface displacement field and crack distribution, while local failures initiated from a 3D preset flaw remain hidden during most of the testing period.
THEORETICAL AND APPLIED FRACTURE MECHANICS
(2022)
Article
Mechanics
Mohamed El-Zeadani, M. R. Raizal Saifulnaz, Mugahed Amran
Summary: The study aimed to evaluate the factors affecting bondstress-slip parameters and propose a simplified bilinear model, while investigating the frictional component and debonding mechanism in FRP plated beams. Experimental results revealed the significant importance of considering the frictional component in predicting ultimate strength, deformation, and ductility of plated members.
COMPOSITE STRUCTURES
(2021)
Article
Environmental Sciences
Bingxiang Yuan, Zihao Li, Zuqing Zhao, Hong Ni, Zhilei Su, Zhijie Li
Summary: The study utilized transparent soil technology and particle image velocimetry to reveal the displacement trends of the soil around a laterally loaded pile, providing early warning when the displacement value and displacement angle of the soil exceed the normal range.
JOURNAL OF SOILS AND SEDIMENTS
(2021)
Article
Chemistry, Physical
Tsz Tung Chan, Stefan Heinrich, Juergen Grabe, Maksym Dosta
Summary: An inventive microscale simulation approach using the discrete element method (DEM) and bonded-particle model (BPM) is applied to investigate the mechanics of frozen particle fluid systems (PFS). The study reveals that strain rate significantly affects the mechanical behavior and properties of the agglomerates, leading to the development of a new solid bond model for describing the rheology of the frozen particle fluid systems.
Article
Chemistry, Physical
Tian-Le Cheng, You-Hai Wen
Summary: The proposed phase-field model, combined with the flood-fill algorithm, efficiently simulates particle coherency loss and statistical features, considering size dependence and metastability. By studying the coarsening process of Al3Sc precipitates, it demonstrates how the particle size distribution changes during coherency loss and affects the coarsening rate.
NPJ COMPUTATIONAL MATERIALS
(2021)
Article
Chemistry, Physical
Meiru Liu, Di Wu, Cong Yin, Yan Gao, Kai Li, Hao Tang
Summary: Prognostics and Health Management (PHM) is a key technology for improving the durability of PEM fuel cells in city buses. This study focuses on predicting degradation trends using aging parameters extracted from a voltage model, and compares the performance of Bayesian ridge regression (BRR) and Gaussian progress regression (GPR) models in establishing the relationship between operating time and aging parameters.
JOURNAL OF POWER SOURCES
(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)