Article
Geochemistry & Geophysics
Claire A. Mondro, Jeffrey E. Moersch, Josh Emery, William M. Dunne
Summary: Large fractures on Europa's surface have been extensively studied for their insights into the satellite's ice shell evolution. However, the presence and influence of small fractures on a global or regional scale have not been well characterized due to limitations in current image data. This study investigates the potential contribution of smaller fractures to the behavior of Europa's ice lithosphere and predicts their abundance and variation in fracture networks using best-fit functions. The findings suggest that abundant small fractures may significantly impact the mechanical properties of the ice lithosphere and create regional variations in fracture abundance, which could have implications for localized plume activity on Europa.
EARTH AND PLANETARY SCIENCE LETTERS
(2023)
Article
Geochemistry & Geophysics
Xue Li, Yi Xue, Fa-ning Dang, Zhihao Zhang, Lin Zhu, Shanjie Su, Shengcheng Wang, Ruifu Liu
Summary: Due to the depletion of resources and reduction of available space, human beings have started to explore deep underground areas. This expansion raises safety concerns, particularly regarding rockburst. This study conducted laboratory tests and analyzed relevant literature and research to investigate the characteristics of granite under the influence of liquid nitrogen (LN2) and study its fracture mode. The results showed that LN2 cooling negatively affects the strength of the rock, and the elastic modulus and peak stress of granite decrease with increasing cycles. The AE ring count, frequency, and amplitude of energy of granite increased with the number of LN2 cycles. The AE parameters characterized two failure modes of the rock: tensile and shear failure. The tendency index of rockburst decreased with decreasing elastic modulus, and the repeated action of LN2 reduced the probability of rockburst to some extent.
Article
Engineering, Geological
Yuedu Chen, Weiguo Liang, A. P. S. Selvadurai, Zhihong Zhao
Summary: The evolution of fracture geometries during shear significantly affects fluid flow in rock fractures. Shear dilation initially increases permeability but is later offset by gouge formation, resulting in reduced fracture permeability. The distribution, location, and size of contacts evolving during shear also play a significant role in determining fracture permeability. Fracture permeability is not only affected by the aperture, but also by the presence of asperity degradation and gouge formation within the fracture.
INTERNATIONAL JOURNAL OF ROCK MECHANICS AND MINING SCIENCES
(2021)
Article
Geosciences, Multidisciplinary
D. Mifsud, Z. Kanuchova, P. Herczku, Z. Juhasz, S. T. S. Kovacs, G. Lakatos, K. K. Rahul, R. Racz, B. Sulik, S. Biri, I Rajta, I Vajda, S. Ioppolo, R. W. McCullough, N. J. Mason
Summary: Previous studies on sulfur ion implantation into the surface of Europa have not detected the formation of SO2. Conflicting results have also been found in studies on the implantation of sulfur ions into CO2 ice. In this study, SO2 formation was observed after implantation into condensed CO2 at 20 K, but not at the Europa-relevant temperature of 70 K. Therefore, other mechanisms should be explored for SO2 formation on Europa instead of the process described in this study.
GEOPHYSICAL RESEARCH LETTERS
(2022)
Article
Mechanics
Ri-hong Cao, Lei Fang, Xianyang Qiu, Hang Lin, Xilong Li, Wenxin Li, Qiuqiu Qiao
Summary: In hot dry rock geothermal energy extraction systems, the heating-water cooling cycles can lead to failure and instability in the rock masses. This study investigated the shear fracture characteristics of granite rocks after H-WC cycles treatment. The results revealed that cyclic H-WC treatment decreased the fracture toughness values, increased the porosity of the granite samples, and affected the acoustic emission characteristics. The study also found that the cyclic H-WC treatment enhanced the fracture plane roughness and its impact increased with increasing temperature.
ENGINEERING FRACTURE MECHANICS
(2023)
Article
Geosciences, Multidisciplinary
Jennifer E. Georgen, A. Katrina Shotorban
Summary: This study examines how plate boundary processes may have played a role in the formation of Shatsky Rise in the western Pacific Ocean, particularly how spreading center geometry facilitated widespread mantle melting.
GEOPHYSICAL RESEARCH LETTERS
(2021)
Article
Multidisciplinary Sciences
Riley Culberg, Dustin M. Schroeder, Gregor Steinbrugge
Summary: The formation mechanism of double ridges on Europa remains unclear. This study analyzes landforms on the Greenland Ice Sheet and suggests that the refreezing of shallow water sills may be responsible for the formation of these ridges. The findings indicate that the same process might be widespread across Europa's ice shell.
NATURE COMMUNICATIONS
(2022)
Article
Nanoscience & Nanotechnology
Chuan Geng, Bo Huang, Kang Sun, Xindi Ma, Kai Hu, Yandong Jia, Xueling Hou, Wanxia Huang, Qingxi Yuan, Gang Wang
Summary: This study investigates the microstructure of metallic glass fibers with different Poisson's ratios or structural heterogeneities using synchrotron X-ray nano-computed tomography and high-resolution transmission electron microscopy. It is found that interlaminated high- and low-density layers induced by shear banding appear in the fracture-affected zone of the fibers. The fraction of crystal-like order regions in the fracture-affected zone is larger than that of the unaffected matrix.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Geosciences, Multidisciplinary
Vincenzo La Bruna, Francisco H. R. Bezerra, Victor H. P. Souza, Rubson P. Maia, Augusto S. Auler, Renata E. B. Araujo, Caroline L. Cazarin, Marcos A. F. Rodrigues, Lucieth C. Vieira, Maria O. L. Sousa
Summary: By studying the Cristal Cave Karst System in the São Francisco Craton of Brazil, it was found that the cave system occurs in a regional folded sector and high-permeability zones are formed along fracture corridors at the fold hinges.
MARINE AND PETROLEUM GEOLOGY
(2021)
Article
Mechanics
Minghui Yang, Lin Zhou, Fangyu Peng, Ben Deng, Yu Huang, Yan Rong
Summary: The study investigated TiBw/TA15 composites with network architecture using high-speed imaging and digital image correlation analysis, analyzing the influences of material microstructures and undeformed chip thickness on workpiece deformation behaviors.
COMPOSITE STRUCTURES
(2021)
Article
Engineering, Civil
Ke Deng, Ming Chen, Peng Yan, Zhendong Leng, Guangdong Yang
Summary: This study investigated the phenomenon of toe formation during blasting excavation and proposed measures to avoid it. The results showed that toe formation is influenced by factors such as blasting load, in-situ stress, and crack propagation direction.
KSCE JOURNAL OF CIVIL ENGINEERING
(2022)
Article
Geochemistry & Geophysics
Thomas King, Sergio Vinciguerra, Jodi Burgess, Philip Benson, Luca De Siena
Summary: Identifying deformation and pre-failure mechanisms preceding faulting is crucial for understanding fault mechanics. This study presents a robust derivation of first motion polarity focal mechanism solutions applied to acoustic emission (AE), demonstrating the complex interplay between different types of deformation in rock samples.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2021)
Article
Nanoscience & Nanotechnology
Xiangnan Pan, Guian Qian, Youshi Hong
Summary: Nanograin materials spontaneously form during ductile fracture, potentially providing a new approach for designing high ductile materials. The dominating mechanism behind this phenomenon is local severe-plastic-deformation.
SCRIPTA MATERIALIA
(2021)
Review
Energy & Fuels
Yijin Zeng, Shidong Ding, Zhongzhong Chu, Guangjun Ma, Zhi Yang, Shuyang Gao
Summary: The research on friction experiments of Longmaxi formation shale in Sichuan Province shows that the lubricity of shale fractures can be enhanced by aqueous solution intrusion, leading to a decrease in friction coefficient and potential reduction in wellbore collapse. The addition of viscosity modifiers CMC-Na and PAC further decreases the friction coefficient, with CMC-Na being more suitable for shale stability. A 4% bentonite slurry also reduces the friction coefficient, ultimately contributing to the stability of fractured shale formation.
PETROLEUM SCIENCE AND TECHNOLOGY
(2022)
Article
Geosciences, Multidisciplinary
Rodrigo S. M. Correa, Estibalitz Ukar, Stephen E. Laubach, Irene Aubert, Juliette Lamarche, Qiqi Wang, Daniel F. Stockli, Lisa D. Stockli, Toti E. Larson
Summary: The Castellas fault in Provence, southern France, underwent two deformation phases during the Upper Cretaceous and the Eocene. Studies on the fault zone provide insights into its formation, evolution, and the properties that influenced fluid flow behavior.
MARINE AND PETROLEUM GEOLOGY
(2022)
