Article
Engineering, Mechanical
Xiang Fan, Hao Yu, Zhiying Deng, Zhongming He, Yanlin Zhao
Summary: This study investigated the crack propagation behavior and fracture characteristics of nonpenetrating flaws in rock specimens using digital carving technology and experimental testing. By observing the location of crack initiation and analyzing stress distribution, the microscopic mechanism of flaw initiation and propagation was explained. The results showed that increasing the angle of the nonpenetrating flaw led to an increase in peak strength of the specimens. The crack first appeared at the front surface and then extended to the back surface, and the failure mode changed from mixed tension and shear failure to shear failure as the angle of the flaw increased.
THEORETICAL AND APPLIED FRACTURE MECHANICS
(2022)
Article
Engineering, Civil
Xunjian Hu, Xiaonan Gong, Junjie Ma, Panpan Guo, Haibo Hu
Summary: A linear parallel bond model combined with Weibull distribution is used to investigate the cracking behavior and stress evolution of rocks containing three parallel flaws under uniaxial compression. The presence of flaws weakens the mechanical properties of rocks and leads to tensile stress concentration around the flaws. The interaction of displacement localization zones formed around flaws complicates the damage or fracture processes of pre-cracked samples.
EUROPEAN JOURNAL OF ENVIRONMENTAL AND CIVIL ENGINEERING
(2023)
Article
Engineering, Mechanical
Xiaoping Zhou, Liang Fu, Hao Cheng, Filippo Berto
Summary: The study found that rock-like materials with multiple preexisting flaws exhibit different mechanical properties and cracking behaviors after high-temperature treatments at different temperatures and ligament angles, with temperature significantly impacting the complete stress-strain curves and cracking behaviors.
FATIGUE & FRACTURE OF ENGINEERING MATERIALS & STRUCTURES
(2021)
Article
Engineering, Electrical & Electronic
Chullhee Cho, Pilgyu Kang, Amir Taqieddin, Yuhang Jing, Keong Yong, Jin Myung Kim, Md Farhadul Haque, Narayana R. Aluru, SungWoo Nam
Summary: Inserting atomically thin interlayers, such as graphene, between metal thin films and substrates can enhance the strain-resilient electrical properties of flexible electrodes, resulting in unique electrical characteristics where electrical resistance gradually increases with strain.
NATURE ELECTRONICS
(2021)
Article
Engineering, Geological
Daping Tai, Shengwen Qi, Bowen Zheng, Chonglang Wang, Songfeng Guo, Guangming Luo
Summary: In this study, the effects of joint row number and inclination on the stress-strain characteristics and failure mode of rock were investigated using numerical models and laboratory direct shear tests. The results showed that joints significantly increased post-peak energy dissipation but had little effect on energy proportion before the peak.
JOURNAL OF ROCK MECHANICS AND GEOTECHNICAL ENGINEERING
(2023)
Article
Engineering, Mechanical
Song Wang, Jian Zhou, Luqing Zhang, Zhenhua Han, Fenxiang Zhang, Yan Fu, Zhifa Yang
Summary: This study investigates the deformation and failure mechanism of the roofs in the Longyou Grottoes using numerical models. The results show that the bending strength of the roofs decreases as the mechanical properties of the bedding planes decrease. This trend is accelerated when the bedding dip angle changes from horizontal to vertical. The fracture modes of the roofs are controlled by the dip angles, mechanical properties, and spacings of the bedding planes.
THEORETICAL AND APPLIED FRACTURE MECHANICS
(2022)
Article
Green & Sustainable Science & Technology
Jian Zhao, Baojing Sun, Fangrui Chang, Xiaoqiang Han, Ning Qi, Yiji Xu, Hailiang Yin, Dawei Deng
Summary: Particle water-jet technology is an efficient method for increasing the erosion rate of cement material. By combining simulation and experimentation, optimal operating parameters were determined to enhance erosion characteristics and achieve maximum erosion rate. Industrial tests showed a 50.7% increase in erosion rate compared to traditional methods, demonstrating the effectiveness of the particle water-jet technology.
JOURNAL OF CLEANER PRODUCTION
(2021)
Article
Engineering, Civil
Zhenlong Zhao, Hongwen Jing, Xinshuai Shi, Guansheng Han
Summary: This paper investigates the mechanical behavior of rock containing two pre-existing holes through laboratory tests and numerical simulation. The experimental results reveal significant stress-strain fluctuations and different failure modes caused by the presence of holes in the rock. The numerical simulation further examines the process of crack initiation, propagation, and coalescence, as well as the mechanism of overall instability.
EUROPEAN JOURNAL OF ENVIRONMENTAL AND CIVIL ENGINEERING
(2022)
Article
Mathematics, Interdisciplinary Applications
Lifan Rong, Jinlin Hu, Haoran Li
Summary: This paper investigates the mechanical properties, acoustic emission characteristics, and damage evolution laws of rocks with different defect holes, considering the influence of hole location. Rock models with different defect hole locations are constructed using a particle flow code. The study discusses the effects of different defect hole positions on mechanical characteristics, acoustic emission (AE) characteristics, damage evolution processes, and failure modes of the rock models. Results show that the elastic modulus has little variation among models with different defect hole locations, and that a defect hole at the center of the model exhibits a higher uniaxial compressive strength compared to a defect hole at the boundary of the model. The evolution of acoustic emission can be divided into three stages, with the position of the defect hole having little influence on the first two stages, but a significant impact on the third stage, including the intensity of acoustic emission and strain range. The position of the defect hole has a minimal effect on the initiation position of cracks in the rock, but it does affect the failure process.
COMPUTATIONAL PARTICLE MECHANICS
(2023)
Article
Energy & Fuels
Weiji Liu, Hai Hu, Xiaohua Zhu, Yunxu Luo, Mengqiu Chen
Summary: This research investigates the application of plasma channel drilling (PCD) technology in the exploitation of hot dry rock (HDR) geothermal resources, and reveals that PCD has the advantages of high rock-breaking efficiency and ROP. The study shows that increasing temperature on the plasma channel does not alter the trend of crack initiation and propagation, but only reduces the time consumption of crack initiation. The research also includes an experimental program to examine the granite fragmentation and borehole generation caused by an electrode bit. The results can provide new ideas and methods for improving the drilling efficiency of HDR formation and help to design the structural of drill bits based on PCD technology.
GEOMECHANICS AND GEOPHYSICS FOR GEO-ENERGY AND GEO-RESOURCES
(2023)
Article
Green & Sustainable Science & Technology
Chenxi Zhang, Diyuan Li, Shunchuan Wu, Long Chen, Jun Peng
Summary: This study delves into the evolution mechanism of structure-type rockbursts, finding that the failure mechanism includes tensile and shear fractures, distinguishing it from strainbursts. Factors such as friction coefficient, rockmass heterogeneity, lateral pressure coefficient, and structural plane length play crucial roles in determining the intensity of structure-type rockbursts.
Article
Geochemistry & Geophysics
Kui Zhao, Wenkai Wu, Peng Zeng, Cong Gong
Summary: This study investigates the characteristics of the quiet period of acoustic emission (AE) during rock failure. It was found that the axial stress in the abnormal area of elastic modulus increases before the main fracture occurs and then rapidly decreases during the AE quiet period. The interval time of the AE quiet period is prolonged as the elastic modulus increases, and cracks mainly occur in the abnormal area.
Article
Materials Science, Multidisciplinary
Dinesh Kumar, Lalit Thakur
Summary: The tribological performance of a TiB2-reinforced AZ91 magnesium metal matrix composite was investigated. The developed composite showed a considerable enhancement in wear resistance due to grain refinement and nearly uniform dispersion of the reinforcement particulates. Adhesion, oxidation, and delamination were reported as the main responsible wear mechanisms, but a mechanically mixed layer acted as a shield against wear at high sliding velocities. The developed composite exhibited better wear resistance than the base matrix alloy, thanks to enhanced hardness and better interfacial capacity.
Article
Engineering, Civil
Fei Xiong, Xinrong Liu, Guangyi Lin, Xiaohan Zhou, Dongshuang Liu, Bin Xu, Yafeng Han, Chunmei He, Zijuan Wang
Summary: The distribution pattern of flaws in rock significantly affects its mechanical behavior. This study investigated the cracking behavior of sandstone with intersecting flaws under uniaxial compression through laboratory tests and numerical simulation. The results showed that the intersecting angle of flaws influences the peak stress and average modulus of the rock, determining the location of main fracture surfaces.
GEOMECHANICS AND ENGINEERING
(2021)
Article
Mechanics
Ludovic Pauchard
Summary: Paints and coatings are produced by depositing a volatile liquid containing dispersed colloidal particles, and the dry film is obtained by evaporating the volatile liquid. The drying process can result in continuous coatings with no porosity, uniform porous coatings, or the formation of singularities such as cracks. When subjected to a wetting and drying process, the coatings can undergo changes in morphology due to their rheological properties, including the growth of blisters.
Editorial Material
Spectroscopy
Wei Yang, Jin-Hua Li, Xiong-Yao Li, Yong-Sheng He
ATOMIC SPECTROSCOPY
(2022)
Article
Geochemistry & Geophysics
Heng-Ci Tian, Fang-Zhen Teng, Xin-Yang Chen, Zi-Xiao Guo, Xiao-Tong Peng, Wei Yang, Yi-Lin Xiao
Summary: Elemental exchange during seafloor alteration has significant effects on the chemical compositions of seawater and oceanic crust, as well as global elemental cycling. This study investigates Li and K isotopic compositions in an altered pillow basalt from Mariana Trench, revealing large isotopic variations on a centimeter scale and providing evidence for multi-mode chemical exchange in oceanic basalts. This research enhances our understanding of seafloor alteration processes.
Article
Chemistry, Multidisciplinary
Jiangyan Yuan, Hao Huang, Yi Chen, Wei Yang, Hengci Tian, Di Zhang, Huijuan Zhang
Summary: This study presents a novel big-data algorithm that utilizes energy-dispersive X-ray spectroscopy (EDS) data to analyze lunar basalts. The algorithm classifies each point based on average composition and recalculates the true density per mineral, providing more accurate bulk composition results. Tests on a lunar mineral database and certified reference minerals demonstrate the accuracy and precision of the algorithm. Measurements on a known lunar meteorite sample confirm the reliability of the algorithm. Application of the algorithm to Chang'E-5 basalts reveals distinct low-Ti and low-Mg features.
ACS EARTH AND SPACE CHEMISTRY
(2023)
Article
Astronomy & Astrophysics
Rui Chang, Honglei Lin, Wei Yang, Renhao Ruan, Xiaoying Liu, Heng-Ci Tian, Jiafei Xu
Summary: China's CE5 mission obtained lunar soil samples and in situ spectra, enabling comparison with laboratory analysis of the same sample. Reflectance spectra measurements of the CE5 soil and two size fractions (<45 and 45-355 μm) at various phase angles revealed that in situ photometric experiments are necessary for spectral exploration on the Moon. The <45-μm fraction showed closer scattering properties to the in situ spectral data, suggesting it may be more representative of pristine lunar soil.
ASTRONOMY & ASTROPHYSICS
(2023)
Article
Geosciences, Multidisciplinary
Huicun He, Jianglong Ji, Yue Zhang, Sen Hu, Yangting Lin, Hejiu Hui, Jialong Hao, Ruiying Li, Wei Yang, Hengci Tian, Chi Zhang, Mahesh Anand, Romain Tartese, Lixin Gu, Jinhua Li, Di Zhang, Qian Mao, Lihui Jia, Xiaoguang Li, Yi Chen, Li Zhang, Huaiwei Ni, Shitou Wu, Hao Wang, Qiuli Li, Huaiyu He, Xianhua Li, Fuyuan Wu
Summary: Analysis of lunar soils returned by the Chang'e-5 mission suggests that impact glass beads on the Moon's surface may contain a significant amount of solar wind-derived water. This finding supports the existence of a hydrated layer in lunar soils that plays a role in the global water cycle on the Moon. The study also reveals that impact glass beads can serve as reservoirs for water on other airless bodies.
Article
Chemistry, Multidisciplinary
Jia-Long Hao, Liu-Ping Zhang, Wei Yang, Zhao-Yang Li, Rui-Ying Li, Sen Hu, Yang-Ting Lin
Summary: A new method based on NanoSIMS imaging mode is reported, which simultaneously improves the spatial resolution and precision of sulfur isotopic analysis. The method uses a long acquisition time and a small primary beam size to obtain sufficient signal amount. The sulfur isotopic composition is acquired through interpolation correction and calculation of calibrated isotopic images. This imaging analysis is superior to spot-mode analysis in irregular analytical areas where high spatial resolution and precision are required.
FRONTIERS IN CHEMISTRY
(2023)
Article
Geochemistry & Geophysics
Heng-Ci Tian, Wei Yang, Di Zhang, Huijuan Zhang, Lihui Jia, Shitou Wu, Yangting Lin, Xianhua Li, Fuyuan Wu
Summary: This study investigates the petrogenesis of Chang'E-5 young mare basalts by analyzing the chemical compositions of plagioclase. The results show large variations in major and trace element concentrations in plagioclase, indicating an extensive fractional crystallization process. The estimated melt compositions reveal a low-Ti and non-KREEP origin for the Chang'E-5 basalts.
AMERICAN MINERALOGIST
(2023)
Article
Geochemistry & Geophysics
Xiangli Wang, Jian-Ming Zhu, Guangliang Wu, Wenjing Liu, Cheng Lin, Wei Yang, Zhifang Xu, James R. Hein
Summary: Stable chromium isotope composition is widely used as a paleo-redox proxy, but its correlation with dissolved O2 concentrations in modern seawater suggests that non-O2 factors may affect marine Cr cycling. New δ53Cr data from hydrogenetic Fe-Mn crusts in the western and central-north Pacific Ocean suggest that trivalent Cr is the major species incorporated from seawater. The δ53Cr values of the crusts decrease from late Eocene to middle Miocene, followed by an increase to modern values, possibly influenced by primary productivity.
Article
Geochemistry & Geophysics
Heng-Ci Tian, Wei Yang, Yubing Gao, Qing Zhou, Renhao Ruan, Yangting Lin, Xianhua Li, Fuyuan Wu
Summary: Determining the types of lunar mare basalts is crucial for understanding the chemical composition of the lunar mantle and the processes involved in their formation. Previous analyses classified the Chang'e-5 basalts as low-Ti type based on bulk-rock analysis and Ti abundances in olivine and plagioclase, while pyroxene composition suggested an affinity to the high-Ti type. However, a reassessment combining pyroxene composition and newly obtained data demonstrated that the CE5 basalts are a result of magmatic differentiation from a low-Ti source, with relatively lower Cr2O3 content and higher TiO2 content compared to both low-Ti and high-Ti basalts.
Article
Geochemistry & Geophysics
Linxi Li, Hejiu Hui, Sen Hu, Hao Wang, Wei Yang, Yi Chen, Shitou Wu, Lixin Gu, Lihui Jia, Fuyuan Wu
Summary: The study of regolith samples returned by the Chang'E-5 mission sheds light on the magmatic activities on the Moon during the late Eratosthenian. The analysis of the basaltic clasts reveals a low-Ti parental melt and the assimilation of KREEP-bearing fragments during magma flow on the Moon's surface.
METEORITICS & PLANETARY SCIENCE
(2023)
Article
Multidisciplinary Sciences
Heng-Ci Tian, Chi Zhang, Wei Yang, Jun Du, Yi Chen, Zhiyong Xiao, Ross N. Mitchell, Hejiu Hui, Hitesh G. Changela, Tian-Xin Zhang, Xu Tang, Di Zhang, Yangting Lin, Xianhua Li, Fuyuan Wu
Summary: This study investigates the mineralogy and geochemistry of lunar basalts from the Chang'e-5 mission, revealing limited magma recharge or shallow-level assimilation in most crystals. Thermal modeling shows an enhanced magmatic flux around 2 billion years ago, suggesting episodic eruptions at the final stage could have above average eruptive fluxes, revising models of lunar thermal evolution.
NATURE COMMUNICATIONS
(2023)
Article
Multidisciplinary Sciences
Bin Su, Di Zhang, Yi Chen, Wei Yang, Qian Mao, Xian-Hua Li, Fu-Yuan Wu
Summary: The lunar basalts returned by the Chang'E-5 mission provide new insights into the extended duration of lunar volcanism and its possible driving mechanisms. High-precision analyses of olivine in the basalts reveal the presence of late-stage cumulates in the lunar mantle source, which could lower the melting temperature and inhibit the partitioning of certain elements into the magma. The study suggests that the addition of easily melted components from the lunar magma ocean is a key factor in driving prolonged volcanic activity on the Moon.
Article
Multidisciplinary Sciences
Junwei Li, Yanhao Lin, Thomas Meier, Zhipan Liu, Wei Yang, Ho-kwang Mao, Shengcai Zhu, Qingyang Hu
Summary: This study investigates the incorporation of water in stishovite using a high-dimensional neuronetwork potential and machine learning algorithm. The researchers found that stishovite and water prefer to form medium- to long-range ordered superstructures with one-dimensional water channels. By synthesizing hydrous stishovite crystals, they confirmed the ordering of OH- groups in the water channels through spectroscopy and observed fluid-like behavior of H atoms upon heating, leading to an exotic 1D superionic state.
Article
Environmental Sciences
Bin Su, Yi Chen, Zongyu Yue, Lin Chen, Ross N. Mitchell, Ming Tang, Wei Yang, Guangyu Huang, Jinghui Guo, Xian-Hua Li, Fu-Yuan Wu
Summary: Partial remelting of KREEP basalts on the Moon could explain the occurrence of highly silicic volcanic constructs without the need for water and plate tectonics. The origin of lunar silicic magmatism remains enigmatic, but phase equilibrium simulations suggest that silicic volcanic constructs can be produced by partial melting of KREEP basalts. This finding may reshape our understanding of early planetary crust formation.
COMMUNICATIONS EARTH & ENVIRONMENT
(2023)
Article
Chemistry, Analytical
Rui-Ying Li, Jialong Hao, Wei Yang, Heng-Ci Tian, Sen Hu, Yangting Lin
Summary: Accurate Li isotope analysis of silicate glasses using SIMS is challenging due to the matrix effect. This study presents Li isotopic measurements on a set of silicate glasses and proposes a correction method to improve accuracy.
JOURNAL OF ANALYTICAL ATOMIC SPECTROMETRY
(2023)
