Article
Materials Science, Multidisciplinary
Gaia Righi, Carlos J. Ruestes, Camelia Stan, Suzanne J. Ali, Robert E. Rudd, Megumi Kawasaki, Hye-Sook Park, Marc A. Meyers
Summary: This study investigates the strength of iron at strain rates approaching the Debye frequency through high-power pulsed laser experiments. It finds that the strength of iron varies between different crystal structures, with factors such as grain boundaries playing a significant role in determining the material's performance.
Article
Materials Science, Multidisciplinary
Tao Zhang, Lan Yan, Lianjie Li, Mingshuai Huo, Hui Wu, Xuming Zha, Ningchang Wang, Xian Wu, Feng Jiang, Zhengyi Jiang, Xipeng Xu
Summary: Grain refinement has a significant impact on mechanical properties, and establishing the relationship between grain evolution and plastic behavior is essential. Through experimental research, it was found that the grain size has a significant influence on the yield stress, strain rate sensitivity, and thermal softening. Based on these findings, a new constitutive model was developed to accurately predict the mechanical behavior of the material.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2022)
Article
Nanoscience & Nanotechnology
Ziyu Wang, Kaoshi Zhang, Yanqiao Song, Raneen Abd Ali, Wenliang Chen, Xingxing Wang
Summary: This study investigated the mechanical behavior and microstructure evolution of 2060 Al-Li alloy under high strain rates. The results showed that high strain rates led to increased dislocation density and grain refinement in the alloy, as well as affected the structure of grain boundaries.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Engineering, Multidisciplinary
Yang Peng, Pang Dongdong, Liu Ju, Huang Zhiguo, Xu Wensong, Dou Zhongsi
Summary: The unloading effect is a critical factor in the failure of surrounding rock in deep underground engineering projects, specifically under high-stress conditions. This study investigates the deformation and failure characteristics of sandstone under different unloading rates and reveals the evolution of surrounding rock stress due to excavation. The findings indicate that excavation disturbance results in complete single-side unloading at the boundary of the surrounding rock, with partial single-side unloading occurring at greater depths. The ultimate strength of the sandstone specimen decreases as a power function with increasing unloading rate.
ALEXANDRIA ENGINEERING JOURNAL
(2023)
Article
Environmental Sciences
Ashley L. Uren, Carsten Laukamp, Annette D. George, Sandra A. Occhipinti, Alan R. A. Aitken
Summary: By integrating remotely sensed hyperspectral datasets with petrographic data, this study successfully mapped the distribution of sedimentary rocks in the Paleoproterozoic Bresnahan Group in Western Australia and inferred grain size variations. The results showed that finer sandstones exhibit greater compositional variation compared to coarser sandstones, and the remotely sensed compositional variations are relatable to changes in sandstone grain size. This demonstrates the potential of using airborne hyperspectral datasets, particularly in the shortwave infrared part of the spectra, to remotely map spatial compositional variations associated with sandstone grain size.
REMOTE SENSING OF ENVIRONMENT
(2021)
Article
Engineering, Geological
Rongzhu Xia, Chunlin Du, Haiyang Zhang, Zhilong Dang, Jia Huang, Chao Zhang
Summary: The study determines the constitutive parameters of the Holmquist-Johnson-Cook (HJC) model for sandstone through static, dynamic, and impact tests. The model accurately describes the mechanical behavior of sandstone and predicts its impact response against aluminum target plates. Parametric studies provide guidance for determining difficultly experimentally determined constitutive parameters. The simulation model presented in the study is a valuable tool for designing vehicles or aircraft to better tolerate impact damage from sandstone debris.
ROCK MECHANICS AND ROCK ENGINEERING
(2023)
Article
Materials Science, Multidisciplinary
H. T. Jeong, W. J. Kim
Summary: The activation volume (V*) and strain-rate sensitivity exponent (m) of CoCrFeMnNi and Al0.5CoCrFeMnNi high entropy alloys (HEAs) were measured at different strain rates and strain levels, showing that V* increased with decreased strain rate, decreased plastic strain, and increased grain size. The addition of aluminum decreased V* by enhancing solid-solution strengthening. The grain-size dependence of V* and flow stress could predict the decrease of m with increased plastic strain, decreased strain rate, and decreased grain size. The difference in the grain-size dependence of m between FCC HEAs and conventional FCC metals was explained by the higher probability of activation of grain-boundary diffusion-controlled grain-boundary-sliding mechanism at nanograin sizes in the conventional metals.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2023)
Article
Materials Science, Multidisciplinary
Xiaoyan Niu, Minglei An, Xiaomeng Li, Wei Li, Xinchun Zhang, Yongsheng Wang
Summary: This study investigates the effects of multiple impacts on the microstructure and dynamic properties of low-silver lead free solder SAC0307. The results show that the grain size coarsens during the second impact but refines during the third impact. The stress-strain curve exhibits three stages with different slopes, and the strain rate hardening effect and strain hardening phenomenon are weakened under high strain rate impacts.
JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE
(2022)
Article
Chemistry, Physical
Jin Wang, Qianli Ma, Hepeng Cheng, Hechun Yu, Suxiang Zhang, Huichao Shang, Guoqing Zhang, Wenbo Wang
Summary: Intense research efforts are focused on the development of advanced high-entropy alloys for aerospace components. The mechanical properties of these alloys are influenced by factors such as phase transformation, dislocation evolution, and grain size, which are affected by the deformation temperature. Molecular dynamics simulation was used to study the response of a high-entropy alloy to strain-induced martensitic transformation. The study found that the alloy changes from a single crystal to a polycrystal during the tensile process, and the deformation mechanisms vary with temperature and strain rate, affecting the strength of the alloy.
Article
Agronomy
Jie Li, Yuehua Feng, Xiaoke Wang, Guiling Xu, Zhengfei Luo, Jinfeng Peng, Qiangxin Luo, Wei Lu, Zhili Han
Summary: Nitrogen application has a strong impact on grain density and yield in rice. While high nitrogen application can increase the total spikelets, it reduces grain weight, especially the high-density grains. Grain size and grain density are the main factors influencing yield.
FIELD CROPS RESEARCH
(2022)
Article
Engineering, Civil
Kun Luo, Yuanmin Wang, Song Luo, Xiaoshuang Li, Kang Peng
Summary: This study conducted triaxial dynamic compression tests using an improved split Hopkinson pressure bar device to investigate the dynamic mechanical properties and size effect of impact-damaged and water-soaked rock. The results showed significant variations in the mechanical properties under different strain rates and size effects.
ARCHIVES OF CIVIL AND MECHANICAL ENGINEERING
(2023)
Article
Materials Science, Multidisciplinary
Shi Xiaohui, Cao Zuhan, Fan Zhiyuan, Guo Ruipeng, Qiao Junwei
Summary: The study investigates the quasi-static tensile behavior of TA2 pure titanium with different grain sizes, showing that larger grain sizes lead to higher uniform deformability due to increased twinning activity. Twin boundaries divide the grains and reduce sliding distance, positively affecting strain hardening rate.
RARE METAL MATERIALS AND ENGINEERING
(2021)
Review
Engineering, Manufacturing
Tao Zhang, Feng Jiang, Hui Huang, Jing Lu, Yueqin Wu, Zhengyi Jiang, Xipeng Xu
Summary: This paper reviews the brittle-ductile transition (BDT) in extreme manufacturing, analyzes the factors affecting it, and discusses the mechanisms behind it. It suggests that the competition between plastic deformation and crack propagation determines the transition between brittleness and ductility. The brittleness or ductility of the machined material should be regulated by deformation scale, deformation temperature, and machining speed to benefit specific manufacturing processes.
INTERNATIONAL JOURNAL OF EXTREME MANUFACTURING
(2021)
Article
Engineering, Mechanical
Ruide Lei, Zhenyu Zhang, Filippo Berto, P. G. Ranjith, Chengpeng Zhang
Summary: The infilled flaws within rocks significantly affect the mechanical behavior, resulting in strain localization and crack formation. The angle of flaws has a significant impact on the strength and stiffness of sandstone, while infilling can alter the geometric pattern of crack networks.
THEORETICAL AND APPLIED FRACTURE MECHANICS
(2021)
Article
Construction & Building Technology
Baofeng Huang, Yixian Xu, Guojun Zhang
Summary: This study investigated the compressive behavior and failure mode of thin sandstone and proposed a mathematical expression to describe the stress-strain relationship. The correlations between porosity, compressive strength, and elastic modulus were analyzed, and a new expression based on the length-diameter ratio was proposed to evaluate the size effect.
Article
Engineering, Geological
K. M. A. S. Bandara, P. G. Ranjith, W. G. P. Kumari
Summary: The study revealed that fractures generated in shale and siltstone formations during hydraulic fracturing exhibit different characteristics, and flow behavior is influenced by factors such as fracture tortuosity and proppant concentration.
ROCK MECHANICS AND ROCK ENGINEERING
(2022)
Article
Engineering, Environmental
Yi Xue, Jia Liu, P. G. Ranjith, Zhizhen Zhang, Feng Gao, Songhe Wang
Summary: This study conducted triaxial compression tests on coal under different gas pressure conditions to explore the influence mechanism of gas pressure on coal deformation, failure, and energy evolution. The mechanical properties, acoustic emission energy characteristics, and nonlinear characteristics of coal containing gas were obtained based on the test data. A theoretical formula for analyzing energy evolution was introduced and verified by test data. The research results indicate that energy rate can be used as a new effective mechanical parameter to analyze and predict the damage and failure characteristics of coal. The findings on energy dissipation characteristics and the defined ratio of dissipative energy rate and input energy rate provide insights for understanding the fracturing evolution and energy driving mechanism of coal.
BULLETIN OF ENGINEERING GEOLOGY AND THE ENVIRONMENT
(2022)
Article
Construction & Building Technology
M. H. Samarakoon, P. G. Ranjith, W. A. M. Wanniarachchi
Summary: This study examines the effects of carbonation on the properties and mechanisms of cement, showing that alkali-activated cements with higher calcium content exhibit better mechanical properties and a denser microstructure when exposed to carbonate brine.
CEMENT & CONCRETE COMPOSITES
(2022)
Article
Thermodynamics
Jizhao Xu, Cheng Zhai, Pathegama Gamage Ranjith, Shuxun Sang, Yong Sun, Yuzhou Cong, Wei Tang, Yangfeng Zheng
Summary: The study investigated the effects of liquid CO2 on coal strength, finding that the coupled effects of liquid CO2 temperature and adsorption can influence coal fracture behavior and crack morphology.
Article
Energy & Fuels
Jizhao Xu, Cheng Zhai, P. G. Ranjith, Shuxun Sang, Xu Yu, Yong Sun, Yuzhou Cong, Yangfeng Zheng, Wei Tang
Summary: The study found that coal affected by liquid CO2 exhibited more complex destruction patterns, larger fractal dimensions, and greater structure degradation. The affected coals showed diverse mechanical responses, with temperature shock and CO2 adsorption potentially leading to crack growth and strength deterioration, ultimately destroying the coal with smaller yield strength.
Article
Energy & Fuels
David Lall, Vikram Vishal, M. V. Lall, P. G. Ranjith
Summary: The study found that gas production was less efficient in the presence of a permeable heterogeneity compared to other scenarios. The permeability affects the vertical extent of dissolved methane volume during thermal stimulation and huff and puff, while well depth influences the radial extent of dissociated molecules.
JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING
(2022)
Article
Engineering, Geological
Chunlin Zhong, Zhenyu Zhang, P. G. Ranjith, Chengpeng Zhang, Kangsheng Xue
Summary: The study found that pore water can affect the radial and volumetric strain evolution of coal, leading to dilation deformation. Additionally, due to the water propping effect, the cracks in saturated coal cannot close tightly during loading, causing sliding and generating numerous tensile cracks. Loading frequency can impact the decay of pore pressure, consequently influencing the number of cracks in coal.
ROCK MECHANICS AND ROCK ENGINEERING
(2022)
Article
Energy & Fuels
Shashika Gajanayake, Ranjith Pathegama Gamage, Pabasara Wanniarachchige, Decheng Zhang
Summary: This study conducted molecular dynamic simulations to investigate the effects of temperature, pressure, and initial CO2 concentration on gas replacement characteristics for methane recovery and CO2 storage. The results showed that higher temperatures resulted in greater methane recovery, but diminished CO2 storage capacity. Higher initial CO2 concentrations facilitated better CO2 penetration into the hydrate structure, leading to increased methane recovery and improved CO2 storage.
JOURNAL OF NATURAL GAS SCIENCE AND ENGINEERING
(2022)
Article
Thermodynamics
P. Cheng, C. P. Zhang, Z. Y. Ma, J. P. Zhou, D. C. Zhang, X. F. Liu, H. Chen, P. G. Ranjith
Summary: Nanoindentation tests were conducted to investigate the effects of ScCO2-water treatment on shale matrix micromechanics, revealing significant heterogeneity in the properties of different minerals. Observation of indentation morphologies showed that considerable micro-fractures were generated in clay minerals, correlated to significant plastic deformation and layered crystal structures.
Article
Engineering, Geological
K. M. A. S. Bandara, P. G. Ranjith, W. Zheng, D. D. Tannant, V. R. S. De Silva, T. D. Rathnaweera
Summary: This study provides a grain-scale analysis of the fracture evolution mechanisms of proppant crushing, rock fracture damage during proppant embedment, and the influence of realistic reservoir/fracture fluid on proppant embedment. The results reveal that the selection of an appropriate proppant type is vital in quantifying the degree of proppant crushing and embedment within fractures.
Article
Thermodynamics
Guanglei Zhang, P. G. Ranjith, Qiao Lyu
Summary: This study reveals the effects of CO2 on the micro and nano-scale properties of coal, confirms the softening effects of CO2 on coal, and indicates that these changes are reversible to some extent.
Article
Energy & Fuels
B. Balinee, P. G. Ranjith, Herbert E. Huppert
Summary: The article discusses the impact of building material production on global carbon emissions and presents methods to reduce environmental impact through the use of waste and carbon sequestration. By incorporating discarded aluminum foil and industrial waste gases into cement, the performance and sustainability of cement can be improved. This approach significantly reduces carbon emissions, lowers costs, and stores a large amount of CO2.
GEOMECHANICS AND GEOPHYSICS FOR GEO-ENERGY AND GEO-RESOURCES
(2022)
Article
Green & Sustainable Science & Technology
Kiran Sapkota, Ehsan Yaghoubi, P. L. P. Wasantha, Rudi Van Staden, Sam Fragomeni
Summary: The feasibility of increasing the percentage of recycled aggregates to 100% in hot mix asphalt (HMA) was investigated. Recycled concrete aggregate (RCA), recycled glass (RG), and reclaimed asphalt pavement (RAP) were used to develop HMAs suitable for roads. The proposed recycled material HMA exhibited superior mechanical and resilient modulus performances, providing evidence-based insights into the increased proportion of recycled materials in the construction of asphalt pavements.
Article
Engineering, Geological
V. R. S. De Silva, H. Konietzky, H. Mearten, P. G. Ranjith, W. G. P. Kumari
Summary: This study proposes a novel approach called the hybrid rock pre-conditioning method to enhance the sustainability and efficiency of low-grade ore mining. The method involves the use of soundless cracking demolition agents (SCDAs) to initiate radial fractures in a predrilled host rock, followed by hydraulic stimulation to extend the fractures. The results show that this method can create a high density of fractures around the injection well, and key factors such as rock mass heterogeneity and stress anisotropy affect its performance.
ROCK MECHANICS AND ROCK ENGINEERING
(2023)
Article
Energy & Fuels
M. H. Samarakoon, P. G. Ranjith
Summary: Ensuring the intactness of cement sheaths is crucial for deep well applications in extreme underground conditions. This study investigates the behavior of wellbore materials, including steel casing, annulus cement sheaths, and surrounding rock formations, under continuous steam injection. The results show that materials in carbonate formations are more vulnerable to stress than those in sandstone formations, and the retention time of maximum temperature in cement sheaths is shorter in sandstone than in carbonate. It is also found that the cement sheaths in compliant formations like sandstone may fail due to tensile cracking along the thinnest thickness.
GEOENERGY SCIENCE AND ENGINEERING
(2023)
