Article
Engineering, Geological
Jian-Feng Liu, Xing Luo, Gan Feng, Lu-Lin Zhou, Xing-Guo Yang, Gong-Da Lu
Summary: The study examines the influence of thermal exposure on rock response over the long term, focusing on the enhanced geothermal system and geological disposal of radioactive waste. Triaxial creep experiments on thermally-stressed Beishan granite reveal that thermal cracking and hydro-static compaction reshape the crystalline fabric and significantly affect creep deformation. This research provides insights into time-dependent rock deformation and its implications for decarbonized electricity production and sustainable energy transition.
INTERNATIONAL JOURNAL OF ROCK MECHANICS AND MINING SCIENCES
(2023)
Article
Engineering, Environmental
Z. H. Wang, T. Su, Heinz Konietzky, Y. L. Tan, G. L. Zhou
Summary: The study focused on the hydraulic properties of Beishan granite, with the findings showing that treatment temperatures below 400 degrees Celsius lead to a gradual decrease in peak strength and crack damage threshold, while treatment at 500 degrees Celsius results in an increase. Additionally, the peak strength and crack damage threshold reached their maximum under a fluid pressure of 4 MPa for each treatment temperature.
BULLETIN OF ENGINEERING GEOLOGY AND THE ENVIRONMENT
(2021)
Article
Metallurgy & Metallurgical Engineering
Wang Zi-hui, Zhou Hong-wei, Konietzky Heinz, Li Shu-min, Wang Ting-zheng
Summary: This research investigates the effects of heating treatment on the mechanical properties of Beishan granite. The results show that heating treatment leads to an increase in sample diameter, a slightly higher peak strength, and a lower dilatancy threshold. Moreover, increasing temperature has negative influence on elastic modulus and Poisson ratio, while micro cracks are closed during heating and contribute to the increase of peak strength.
JOURNAL OF CENTRAL SOUTH UNIVERSITY
(2022)
Article
Engineering, Geological
Yao Song, Zhongwen Yue
Summary: This study investigated the impact of loading rate on the dynamic fracture behavior of Beishan granite, revealing a positive correlation between fracture toughness and loading rate, with CCNSCB specimens showing higher toughness values than NSCB specimens. The evolution of DSIFs and dynamic fracture energy of Beishan NSCB and CCNSCB specimens were similar, showing a positive relationship with loading rate, while the fracture energy absorption rate gradually decreased with increasing loading rate.
SOIL DYNAMICS AND EARTHQUAKE ENGINEERING
(2021)
Article
Engineering, Mechanical
Houcine Jemii, Amir Bahri, Rym Taktak, Noamen Guermazi, Frederic Lebon
Summary: This study investigates the load-deflection response of the material used for production of polymeric pipes, evaluating their flexural properties and examining the effects of various configurations and parameters. The research shows that the flexural stress-strain response of pipe materials exhibits distinct characteristics and behaviors under different loading conditions. Aging and notches significantly decrease the flexural performance of pipe materials.
ENGINEERING FAILURE ANALYSIS
(2022)
Article
Engineering, Environmental
C. S. Wang, J. F. Liu, Y. W. Zhao, S. J. Han
Summary: This study investigated the tensile properties and crack modes of Beishan granite using different testing methods. It was found that the failure during the Brazilian splitting test was more severe and cracks expanded more rapidly compared to the direct tensile test. Additionally, a damage constitutive model for the rock was established and the change process of the damage variable was divided into three stages.
BULLETIN OF ENGINEERING GEOLOGY AND THE ENVIRONMENT
(2022)
Article
Materials Science, Multidisciplinary
Gurcan Atakok, Menderes Kam, Hanife Bukre Koc
Summary: This study investigates the effects of Fused Deposition Modeling (FDM) production parameters on the strength of 3D printed polylactic acid (PLA) and recycled polylactic acid (Re-PLA) test parts. The results show that layer thickness is the most influential factor and using recycled filament enhances environmental awareness.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2022)
Article
Chemistry, Multidisciplinary
Guobo Wang, Tao Meng, Gan Feng, Lifeng Ma, Weimin Yang, Yi He, Zhijiang Zhang, Xufeng Liang
Summary: Fracture characteristics of bedded sandstone were investigated through numerical simulations. The results indicate that the fracture properties of sandstone are influenced by both the strength of the laminae and the angle. The fracture toughness and peak strength of weak sandstone are reduced and more easily affected by the bedding angle, while the difference in fracture characteristics between strong sandstone and homogeneous sandstone is not significant. The anisotropy between the bedding and the sandstone, as well as the competition/synergy between the main crack and the bedding plane bias crack, is identified as the key mechanism behind these phenomena. These findings have important theoretical implications for the safety and stability of underground engineering in China.
APPLIED SCIENCES-BASEL
(2023)
Article
Engineering, Mechanical
Changzeng Fan, Zejian Xu, Yang Han, Gang Wu, Yan Liu, Fenglei Huang
Summary: In recent years, there has been rapid development of dynamic fracture experimental techniques in engineering and scientific research. However, challenges such as loading rate limitations, accuracy of transmitted wave, and difficulty of crack initiation still exist in dynamic fracture tests. In this study, a novel mode I dynamic fracture experimental technique is proposed to address these issues, using a mini three-point bending (3PB) specimen and specially designed fixtures for the split Hopkinson pressure bar (SHPB) system. The feasibility and reliability of this new method are verified by determining the dynamic fracture toughness (DFT) of two kinds of ultra-high-strength steel (UHSS) and comparing the results with those of other methods.
INTERNATIONAL JOURNAL OF IMPACT ENGINEERING
(2023)
Article
Materials Science, Ceramics
Kang An, Shiyu Li, Siwu Shao, Peng Liu, Jinlong Liu, Liangxian Chen, Junjun Wei, Yuting Zheng, Qing Liu, Chengming Li
Summary: In this study, standard diamond bars were prepared and their fracture strength and elastic modulus were measured using the ISO standard. The fracture strength of diamond was found to be affected by sample thickness, but not by length and width. The fracture strengths of standard ZnS, sapphire, and alumina, as well as the elastic moduli of sapphire and alumina, were also compared.
CERAMICS INTERNATIONAL
(2022)
Article
Thermodynamics
Qi He, Shiwan Chen, Guibin Wang, Shuangying Zuo, Fubo Yang
Summary: This study investigated the thermo-mechanical properties of Beishan granite during heating and cooling processes. The temperature difference between different mineral grains was evident, with feldspar expanding and quartz and mica being compressed during heating. The thermal cracking emerged within a certain temperature range and was active during temperature changes. It was found that the mild high temperature caused by decay heat of high-level radioactive waste could enhance the tightness and strength of the repository, contributing to its long-term safety.
INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER
(2023)
Article
Engineering, Geological
Zuliang Shao, Lei Sun, Kareem Ramzy Aboayanah, Quansheng Liu, Giovanni Grasselli
Summary: This study investigates the effect of thermal treatment on rock fracture characteristics through experimental and numerical work. The results show a significant influence of thermal treatment on fracture toughness and roughness, with thermally induced microcracks playing a key role in these effects.
ROCK MECHANICS AND ROCK ENGINEERING
(2022)
Article
Energy & Fuels
Yun Wu, Xiao-Zhao Li, Zhen Huang, Ying-Chao Wang, Long-Chuan Deng
Summary: The study found that the P-wave velocity of granite decreases with temperature, the porosity of granite increases rapidly above 500 degrees C, and the tensile strength of granite linearly decreases with temperature. Acoustic emission tests and thin section observations showed that temperature leads to an increase in the closure and unstable extension of cracks. The research findings can provide guidance for the construction safety of rock masses exposed to high temperatures.
GEOMECHANICS AND GEOPHYSICS FOR GEO-ENERGY AND GEO-RESOURCES
(2021)
Article
Engineering, Geological
X. G. Zhao, J. Wang, M. Cai, G. S. Su
Summary: Experimental study showed that under different σ(2) loading conditions, the strainburst characteristics of the specimens depend on the magnitude of σ(2). The lubricated specimens exhibited significantly different crack initiation, peak strength, failure mode, and energy release characteristics compared to the non-lubricated specimens. Additionally, with increasing σ(2), the differences in weight and kinetic energy of ejected rock fragments between the two groups also increased.
ROCK MECHANICS AND ROCK ENGINEERING
(2021)
Article
Geochemistry & Geophysics
Xiang Zhang, Manke Wei, Zhen Lei, Ying Chen
Summary: Granite is the main host rock for underground nuclear waste storage in Beishan, China. This study investigated the effects of high temperature on the physical and mechanical properties of Beishan granite samples through laboratory experiments and analysis. The results showed that the elastic modulus decreased significantly at temperatures between 25-200℃ and 600-800℃, while the peak stress decreased by 72.664% at 800℃. A constitutive model for thermally damaged Beishan granite was established based on damage theory and the Drucker-Prager criterion. Simulation using the Particle Flow Code (PFC) was conducted to study crack development. These findings provide theoretical support for the mechanics of high-temperature treated rocks.
Article
Engineering, Geological
Guanghui Jiang, Jianping Zuo, Liyun Li, Teng Ma, Xu Wei
ROCK MECHANICS AND ROCK ENGINEERING
(2018)
Article
Engineering, Geological
Yunjiang Sun, Jianping Zuo, Murat Karakus, Jintao Wang
INTERNATIONAL JOURNAL OF ROCK MECHANICS AND MINING SCIENCES
(2019)
Article
Mechanics
Jian-Ping Zuo, Yu-Lin Li, Cunhui Liu, Hai-yan Liu, Jintao Wang, Hong-tao Li, Lei Liu
ENGINEERING FRACTURE MECHANICS
(2019)
Article
Construction & Building Technology
Jian-ping Zuo, Jin-hao Wen, Yong-dong Li, Yun-jiang Sun, Jin-tao Wang, Yun-qian Jiang, Lei Liu
TUNNELLING AND UNDERGROUND SPACE TECHNOLOGY
(2019)
Article
Engineering, Environmental
Jintao Wang, Jianping Zuo, Yunjiang Sun, Jinhao Wen
Summary: In temperature-related rock engineering projects, cyclic loading can lead to different fatigue crack behaviors in rocks. The thermal treatments cause thermal cracking and weakening of mineral grain boundary strength, resulting in changes in crack patterns under cyclic loading. The observations show that as temperature increases, the cracking patterns transition from forward propagation of new cracks to continuous opening of pre-existing cracks.
BULLETIN OF ENGINEERING GEOLOGY AND THE ENVIRONMENT
(2021)
Article
Engineering, Mechanical
D. J. Liu, J. P. Zuo, J. Wang, T. L. Zhang, H. Y. Liu
ENGINEERING FAILURE ANALYSIS
(2020)
Article
Mechanics
Bo Lei, Jianping Zuo, Haiyan Liu, Jintao Wang, Fei Xu, Hongtao Li
Summary: Research on the crack evolution mechanism and fracture behavior of bedding shale is important for shale gas exploitation. Mechanical properties, particularly the anisotropy of shale, significantly affect hydraulic fracture initiation and propagation. The study found that the mechanical properties of weak bedding planes have a significant impact on fracture behavior, and fractal method can quantitatively characterize the evolution of microcracks in bedding shale.
ENGINEERING FRACTURE MECHANICS
(2021)
Article
Engineering, Geological
Zhaofeng Wang, Pengzhi Pan, Jianping Zuo, Yaohui Gao
Summary: A three-dimensional strength criterion for hard rock is developed based on fracture mechanics theory and wing crack model. The criterion can be extended to microcrack cluster and simplified as HoekeBrown criterion when the intermediate principal stress s2 equals the minimum principal stress s3. The opening direction of the microcrack cluster decreases with the increase of the intermediate principal stress coefficient, which is described by an empirical function and verified with 10 kinds of hard rocks. The strength of rock is influenced by the coupled effect of stress level and the opening direction of microcrack clusters, resulting in the intermediate principal stress effect.
JOURNAL OF ROCK MECHANICS AND GEOTECHNICAL ENGINEERING
(2023)
Article
Engineering, Mechanical
Yingjie Li, Ting Ni, Fang Zhang, Yuanhang Li, Jianping Zuo, Shankun Zhao
Summary: By using U-Net deep learning network model for image segmentation, the crack tip position of mixed-mode I-II cracks can be accurately detected and located, which facilitates the calculation of dynamic stress intensity factors. This method has the potential in identifying crack propagation paths and tip positions, improving solution accuracy and speed, and providing reference for crack growth evolution research.
THEORETICAL AND APPLIED FRACTURE MECHANICS
(2023)
Article
Chemistry, Physical
Zhongzeng Wei, Bing Bai, Hui Bai, Yongliang Duan, Mingxue Yang, Haojie Cao, Zhijun Zuo, Jianping Zuo, Qiang Wang, Wei Huang
Summary: By forming a 2D graphene cover on the graphene/Cu(111) interface, the formation of the key intermediate CH3 in Syngas conversion is promoted while the formation of CH3OH is suppressed. Furthermore, C2H5OH is the most competitive product through CHO insertion into the CH3 species. The graphene/Cu(111) interface modulates the electron transfer in the confined space, thus affecting the product selectivity of Syngas conversion.
CATALYSIS SCIENCE & TECHNOLOGY
(2023)
Article
Metallurgy & Metallurgical Engineering
Jin-tao Wang, Jian-ping Zuo
JOURNAL OF CENTRAL SOUTH UNIVERSITY
(2020)
Article
Engineering, Geological
Jianping Zuo, Jingfang Lu, Rojin Ghandriz, Jintao Wang, Yanhong Li, Xiaoyan Zhang, Jun Li, Hongtao Li
JOURNAL OF ROCK MECHANICS AND GEOTECHNICAL ENGINEERING
(2020)
Review
Energy & Fuels
Jianping Zuo, Jintao Wang, Yunqian Jiang
INTERNATIONAL JOURNAL OF COAL SCIENCE & TECHNOLOGY
(2019)
Article
Geosciences, Multidisciplinary
Jian-ping Zuo, Yun-jiang Sun, Yue-chun Li, Jin-tao Wang, Xu Wei, Long Fan
ARABIAN JOURNAL OF GEOSCIENCES
(2017)
Article
Mechanics
Xiaolong Liu, Kelian Luo, Pengcheng Gao, Tao Cong, Xi Wang, Wenjing Wang
Summary: This paper investigates the formation mechanisms of the zig-zag crack region on the shattered rim of railway wheels. The zig-zag crack region, identified as a typical region for crack propagation in rolling contact fatigue behavior, was observed using scanning electron microscopy and transmission electron microscopy. The formation of the zig-zag morphology is attributed to the periodic deflection of the propagation path relative to the initial propagation plane, caused by the limited plastic deformation zone at the crack tip. Grain refinement and secondary cracks in the zig-zag crack region are a result of the large compressive and shear stresses induced by rolling contact loading.
ENGINEERING FRACTURE MECHANICS
(2024)
Article
Mechanics
Anastasia Iziumova, Aleksei Vshivkov, Ivan Panteleev, Virginia Mubassarova, Oleg Plekhov, Denis Davydov
Summary: The aim of this study was to investigate the correlation between structural, acoustic emission, and thermal characteristics of fatigue crack growth in titanium alloys. Cluster analysis of the acoustic emission signals revealed two different types of signals observed during the fatigue crack development. It was experimentally demonstrated that the stored energy tends to reach an asymptotic value at the final stage of fatigue crack growth and this is correlated with the twinning process intensification in titanium alloy Ti Grade 2. A correlation was assumed between the stages of change in heat flux, the cumulative energy of the first cluster of acoustic emission signals, and the crack length.
ENGINEERING FRACTURE MECHANICS
(2024)
Article
Mechanics
M. Vieira de Carvalho, I. A. Rodrigues Lopes, F. M. Andrade Pires
Summary: This study investigates the numerical challenges of fracture mechanics models within implicit quasi-static frameworks and proposes an instability criterion. The ratio of cohesive to internal power is identified as a crucial factor. Two strategies for handling fracture problems with instabilities are discussed and a comparative assessment is performed. The study also examines more complex material responses, including transformation-induced plasticity effects.
ENGINEERING FRACTURE MECHANICS
(2024)
Article
Mechanics
Thomas Duminy, Aurelien Doitrand, Sylvain Meille
Summary: This study conducted in situ wedge splitting tests on millimeter-size PMMA samples and proposed a method to determine the material tensile strength and critical energy release rate using digital image correlation and a full finite element implementation of the coupled criterion.
ENGINEERING FRACTURE MECHANICS
(2024)
Article
Mechanics
Xin Chang, Xingyi Wang, Chunhe Yang, Yintong Guo, Yanghui Wan
Summary: The influence of cyclic thermal shock and high-temperature acid etching on the Mode I fracture of shale was investigated in this study. It was found that cyclic thermal shock severely degrades the strength and fracture toughness of shale, while high-temperature acid etching treatment improves the fracture toughness. These findings are valuable for optimizing process parameters to reduce initiation pressure in deep shale formations.
ENGINEERING FRACTURE MECHANICS
(2024)
Article
Mechanics
Liaojun Yao, Mingyue Chuai, Zhangming Lyu, Xiangming Chen, Licheng Guo, R. C. Alderliesten
Summary: Methods based on fracture mechanics have been widely used in fatigue delamination growth (FDG) characterization of composite laminates. This study proposes appropriate similitude parameters to represent FDG behavior with different R-ratios.
ENGINEERING FRACTURE MECHANICS
(2024)
Article
Mechanics
Zesheng Zang, Zhonghui Li, Yue Niu, Shan Yin
Summary: This study conducted experiments and recorded signals to investigate the fracture behavior and damage evolution characteristics of coal samples. The results showed that as loading proceeds, the stress, electric potential (EP), and acoustic emission (AE) values increase, and EP and AE signals are excited when stress drops. The fracture behavior of coal samples is altered by flaw inclination, and the destruction mode becomes increasingly complicated. The damage evolution characteristics of coal samples can be evaluated and analyzed by defining the coefficient of variation (CV value) of EP and the b value of AE.
ENGINEERING FRACTURE MECHANICS
(2024)
Article
Mechanics
Clotilde Berdin, Nathalie Prud'homme
Summary: In this study, zirconia layers with different fractions of tetragonal phase and thicknesses were tested for multi-cracking behavior. Cracks perpendicular to the tensile direction were observed, showing a blunting effect into the substrate. The ratio of crack spacing at saturation to layer thickness decreased as the layer thickness increased. Unit cell modeling was used to establish a relationship between crack spacing and layer strength, which fell within the bounds of Hu and Evans model and was found to be insensitive to the tetragonal zirconia fraction.
ENGINEERING FRACTURE MECHANICS
(2024)
Article
Mechanics
Huadong Zhang, Weichen Kong, Y. H. Liu, Yuh J. Chao
Summary: Williams' series expansion crack tip solution in linear elasticity is modified to include a uniform crack face pressure. Practical methods to calculate T-stress from near crack tip stresses are outlined. The analytical results are consistent with numerical results.
ENGINEERING FRACTURE MECHANICS
(2024)
Article
Mechanics
Jiahao Kong, Haoyue Han, Tao Wang, Guangyan Huang, Zhuo Zhuang
Summary: This paper introduces a phase-field model for polymer foam materials by combining the phase-field method with the crushable foam model. The model is calibrated using experimental data and successfully simulates the fracture processes of polyurethane under different loading conditions. The study is important for the engineering applications of polymer foam materials.
ENGINEERING FRACTURE MECHANICS
(2024)