Article
Engineering, Geological
Xu Li, Guangyao Si, Joung Oh, Ismet Canbulat, Zizhuo Xiang, Tianbin Li
Summary: In this study, an elastoplastic damage model based on non-destructive monitoring methods was developed to accurately capture the damage evolution inside rock mass. Experimental results showed that P wave velocity can serve as an indicator for the damage evolution of rock material. Additionally, a modified plastic potential and a scalar damage variable were proposed to successfully capture the behavior of rock samples under different loading conditions. The study proves that P wave velocity can be an effective approach to measure and forecast the internal damage evolution inside rock mass.
ROCK MECHANICS AND ROCK ENGINEERING
(2022)
Review
Biochemical Research Methods
Kirill Kolesnik, Mingxin Xu, Peter V. S. Lee, Vijay Rajagopal, David J. Collins
Summary: Acoustic fields are utilized in micromanipulation due to their biocompatibility and ability to generate force gradients at the scale of single cells. Recent advances have focused on improving the flexibility of applying acoustic fields, allowing for the generation of arbitrary arrangements of pressure fields, spatial localization of acoustic fields, and selective translation of individual particles. These developments open up a wide range of applications in tissue engineering, diagnostic devices, high-throughput sorting, and microfabrication.
Article
Chemistry, Physical
Petr Louda, Aleksandr Sharko, Dmitry Stepanchikov, Artem Sharko
Summary: This study explores the propagation of acoustic emission signals in continuous conjugated media under real-time loading. The results demonstrate the plastic deformation properties of polymer coatings on a metal base using the acoustic emission method. The principal component method is used to analyze the acoustic emission spectra and trace the evolution of deformation transformation processes. The study also investigates the propagation of acoustic emission vibrations in different combinations of materials.
Article
Nanoscience & Nanotechnology
Radim Ctvrtlik, Jaroslav Cech, Jan Tomastik, Lukas Vaclavek, Petr Hausild
Summary: The plastic instabilities of a silicon iron single crystal were studied using spherical nanoindentation coupled with acoustic emission detection. Three possible scenarios were identified, including gradual plasticity development, sudden onset of plasticity, and an elastic response. Reversible microstructural changes were also observed, expanding the definition of acoustic emission. Furthermore, acoustic emissions proved to be a powerful method for examining different deformation mechanisms observed during indentation loading.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Energy & Fuels
Kumar Aanjaneya, Yawei Chen, Weiyu Cao, Claus Borgnakke, Arvind Atreya
Summary: This study numerically investigates the effectiveness of localized swirling injection in enhancing reactant dilution for an HC combustor operating with enriched oxidizers. The results show that swirling injection has effects on the flow field and NOx emissions, with an optimal swirl intensity for reducing NOx emissions. Competition between swirl-assisted and entrainment-driven dilution is observed, indicating a trade-off relationship in terms of NOx emissions.
Article
Chemistry, Physical
Alexander A. Kolganov, A. Sreenithya, Evgeny A. Pidko
Summary: Rational plastic recycling is crucial for addressing environmental challenges. Chemical recycling, particularly via homogeneous catalysis, shows promise in converting plastic waste into valuable products. However, the structural and functional complexities of post-consumer polymer wastes pose challenges for catalytic upcycling. This study used density functional theory to investigate the dehydrogenative upcycling of polyethylene and found that common impurities in polyethylene inhibit the overall catalyst performance.
Article
Physics, Applied
Marx Akl, Liping Huang, Yunfeng Shi
Summary: Understanding the deformation behavior of nanoparticles under compression is important for both scientific research and practical applications. Using molecular dynamics simulations, compression tests were conducted on brittle glassy nanoparticles. It was found that shear bands formed in a similar pattern during the early stages of plastic deformation, regardless of the nanoparticle size. However, as the deformation progressed, dominant cracks appeared in large nanoparticles while being suppressed in smaller ones, exhibiting a size-dependent brittle-to-ductile transition. The effect of surface stress on fracture was also investigated, revealing that compressive surface stress strengthened the nanoparticles by suppressing crack formation, while tensile surface stress had the opposite effect. Nanoparticles with both tensile and compressive surface stress promoted shear deformation, potentially compromising the mechanical performance of tempered glass.
JOURNAL OF APPLIED PHYSICS
(2023)
Article
Chemistry, Multidisciplinary
Federica Barbaresco, Luisa Racca, Luca Spigarelli, Matteo Cocuzza, Simone Luigi Marasso, Candido Fabrizio Pirri, Giancarlo Canavese
Summary: This study focuses on the focalization performances of a silicon-based bulk acoustic wave device for separating specimens by micrometric dimensions. The results show high focalization performances at different microparticle concentrations. The technology has the potential to be used for the development of diagnostic tools for early diagnosis or specific target therapies.
Article
Engineering, Geological
Susheng Wang, Lunyang Zhao, Wanlu Zhang
Summary: This study proposes an enhanced constitutive model for quasi-brittle rocks by incorporating the evolution of localized damage. The model accurately predicts the strength and post-peak mechanical behaviors of rocks.
Article
Physics, Applied
Y. S. Luo, Z. Wang, J. Eckert, J. W. Qiao
Summary: This study establishes a theory bridging the free-volume and shear-transformation zone concepts to predict the failure threshold of bulk metallic glasses (BMGs) and investigates the physical mechanism of slip. The room-temperature theoretical failure threshold follows a material-dependent criterion similar to the glass-transition temperature, providing a quantitative understanding of failure mechanisms highly dependent on serrations in BMGs. The linear relation between the increment of free-volume and strain rate at small time intervals describes inhomogeneous flow.
JOURNAL OF APPLIED PHYSICS
(2021)
Article
Materials Science, Composites
Runmin Xu, Chen Wang, Kangkang Xu, Guanghui Liu, Hao Wang, Shiliu Zhu, Yuxia Chen, Yong Guo
Summary: Acoustic emission (AE) technology is a significant tool for analyzing the mechanical properties of wood-plastic composites (WPCs), allowing precise observation of their damage evolution and fracture process. It provides important technical support for the emerging WPC industry.
POLYMER COMPOSITES
(2023)
Article
Materials Science, Multidisciplinary
Kunsen Zhu, Pingjun Tao, Chaohan Zhang, Zhihao Zhao, Weijian Zhang, Yuanzheng Yang, K. Kaviyarasu
Summary: The plastic deformation behavior of metallic glass at room temperature is highly sensitive to strain rates, with plastic strain, yield strength, compressive strength, and fracture strength increasing as strain rates decrease. The number and density of shear bands also increase with decreasing strain rates, influencing the overall fracture morphology and serrated flow behavior.
MATERIALS TODAY COMMUNICATIONS
(2021)
Article
Green & Sustainable Science & Technology
Handong Liu, Jialiang Wang, Huaichang Yu, Yiying Zhang
Summary: Cyclic loading and unloading tests were conducted on granite with varying stress amplitudes to investigate the evolution trends of its elastic modulus, plastic strain, dissipated energy density, and acoustic emission events under extreme stress. The results showed that the loading deformation modulus of granite decreased by approximately 5-13% at extreme stress levels, while the unloading deformation modulus remained relatively unchanged. The cumulative dissipated energy density of granite significantly increased with the increase of extreme stress. Acoustic emission events occurred only when the rock was subjected to a load exceeding the maximum historical stress, and the intensity of acoustic emission was positively correlated with the difference between this stress and the historical maximum value. Extreme stress below the crack damage threshold reduced the crack growth potential of the rock, while extreme stress above the threshold aggravated rock damage.
Article
Engineering, Electrical & Electronic
Ge Zheng, Yong Yan, Yonghui Hu, Wenbiao Zhang, Long Yang, Lanqi Li
Summary: A novel method for online measurement of the mass flow rate of pulverized fuel through acoustic emission detection and electrostatic sensing is proposed. By changing the installation orientation of the sensing head, the relative error can be reduced. The system shows promising performance under experimental conditions.
IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT
(2021)
Article
Thermodynamics
S. Padmanaba Sundar, Vijayabalan Palanimuthu, Ravishankar Sathyamurthy, D. Hemalatha, R. Sathish Kumar, R. Bharathwaaj, S. Vasanthaseelan, Ali Chamkha
Summary: The study demonstrates that the use of neat plastic oil with TiO2 nanoparticle additives can enhance the efficiency of a diesel engine and decrease emissions. Increasing the concentration of nano additives leads to a significant reduction in smoke and hydrocarbon emissions.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2022)
Article
Nanoscience & Nanotechnology
Evgeniy Merson, Vitaliy Poluyanov, Pavel Myagkikh, Dmitri Merson, Alexei Vinogradov
Summary: The study found that increasing strain rate after pre-exposure treatment can enhance the ductility of the ZK60 alloy. Contrary to conventional beliefs, the mechanism of PESCC is associated with a corrosion products layer containing sealed corrosive media, rather than diffusible hydrogen.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Chemistry, Analytical
Einar Lovli Hidle, Rune Harald Hestmo, Ove Sagen Adsen, Hans Lange, Alexei Vinogradov
Summary: This paper proposes a knowledge-based data analysis algorithm for health condition monitoring in rotating machinery, specifically targeting the early detection of subsurface cracks induced by contact fatigue. A robust fault detector is introduced and its efficacy is demonstrated through a long-term durability test on a case-hardened steel roller. The reliability of subsurface crack detection is confirmed by independent periodic ultrasonic inspections. Subsurface cracks as small as 0.5mm are identified and their steady growth is tracked using the proposed acoustic emission (AE) technique. Challenges and future prospects of this methodology are discussed.
Article
Materials Science, Multidisciplinary
Yu Ding, Haiyang Yu, Meichao Lin, Kai Zhao, Senbo Xiao, Alexey Vinogradov, Lijie Qiao, Michael Ortiz, Jianying He, Zhiliang Zhang
Summary: An atomistic study was conducted on the intergranular fracture pathway of nickel, revealing the coupled effect of hydrogen and deformation temperature on vacancy generation and intergranular fracture. The results are in good agreement with recent experiments, and a quantitative correlation between the proportion of intergranular fracture and vacancy concentration was derived for the first time.
Article
Nanoscience & Nanotechnology
A. Sendrowicz, A. O. Myhre, A. V. Danyuk, A. Vinogradov
Summary: This study investigates the energy dissipation and storage during strain hardening of metals using complementary in situ techniques. A thermodynamic modelling approach based on a dislocation evolution method is proposed and experimentally verified. The results agree with existing models and demonstrate the self-consistency and predictive capacity of the proposed approach.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Materials Science, Multidisciplinary
E. D. Merson, V. A. Poluyanov, P. N. Myagkikh, D. L. Merson, A. Yu. Vinogradov
Summary: The effect of chemical composition, temperature, circulation, and pH of simulated body fluid (SBF) on the corrosion and stress corrosion cracking (SCC) susceptibility of alloy ZK60 was investigated. The study found that chemical composition and pH adjustment of SBF significantly affected the corrosion and SCC susceptibility of the alloy, while temperature and circulation had a minor effect. pH adjustment decreased the corrosion rate and increased the SCC susceptibility of the alloy. The experimental factors considered in this study should be taken into account for reliable assessment of the corrosion and SCC resistance of biomedical Mg alloys.
LETTERS ON MATERIALS
(2022)
Review
Chemistry, Physical
Alexei Vinogradov, Evgeniy Merson, Pavel Myagkikh, Mikhail Linderov, Alexandr Brilevsky, Dmitry Merson
Summary: This article provides an overview of achievements and knowledge gaps in the field of biodegradable magnesium alloys. It focuses on the popular Mg-Zn-Ca system as a representative example. The article reviews processing techniques and functional properties achieved through various processing routes. It also discusses corrosion properties, mechanical-chemical interactions, and challenges faced by researchers in this area.
Article
Chemistry, Physical
Evgeniy Merson, Vitaliy Poluyanov, Pavel Myagkikh, Dmitri Merson, Alexei Vinogradov
Summary: This study aimed to clarify the healing mechanism of Mg alloys exposed to corrosion solutions and stored in air, showing that PESCC gradually reduced and was eventually suppressed with increasing time and temperature of air storage. Recovery of elongation and complete elimination of PESCC were achieved after 24 hours of air storage at 150-200 degrees C, indicating the role of corrosion solution and hydrogen in forming specific zones on the fracture surface.
Article
Materials Science, Multidisciplinary
Andrei Makarov, Marina Kretova, Gennadii Afonin, Nikolai Kobelev, Vitaly Khonik
Summary: This study conducted high-precision measurements of the temperature dependences of the shear modulus G in bulk metallic glass. It found that plastic deformation significantly affects the anharmonic, electronic, and relaxation components of G, with the relaxation contribution increasing, anharmonic component increasing, and electronic component decreasing.
Article
Materials Science, Multidisciplinary
E. D. Merson, V. A. Poluyanov, A. Polunin, P. N. Myagkikh, D. L. Merson, A. Yu. Vinogradov
Summary: Preliminary immersed magnesium alloys suffer from pre-exposure stress corrosion cracking (PESCC) due to corrosion product film-induced stress (CPFIS). However, the internal residual stresses associated with corrosion product layer formation have not been investigated. In this study, the internal residual stresses of alloy ZK60 exposed to corrosion solution were evaluated using deflection and X-ray diffraction techniques. It was found that CP deposition on ZK60 alloy surface creates compressive internal stresses of both kinds - I and II. Macro residual stress of kind I does not exceed 3 MPa, while micro residual stress of kind II in the surface layer can be as high as 290 MPa.
LETTERS ON MATERIALS
(2023)
Article
Chemistry, Physical
Chandrahaasan K. Soundararajan, Dong Wang, Alexey Vinogradov
Summary: This study investigates the nanomechanical properties of Inconel 625 alloy under a hydrogen environment through in-situ electrochemical nanoindentation experiment. The hydrogen effect on various stages of the load-displacement plot is quantified, and it is found that hydrogen charging reduces the pop-in load and pop-in width, indicating hindered dislocation glide. The study also examines hydrogen-induced slip line formation and nanohardness variation using a diffusion-desorption model, and investigates the difference in plastic behavior between air and hydrogen environments through electron channeling contrast imaging.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Computer Science, Artificial Intelligence
Yu Wang, Alexey Vinogradov
Summary: This paper proposes a simple and easy-to-implement ensemble approach, the history-state ensemble (HSE) method, which leverages the "local sub-optima" of deep networks to improve the performance of deep neural networks. It is demonstrated that neural networks can naturally generate multiple diverse "local sub-optima" during training, and their combination can effectively enhance the accuracy and stability of a single network. The advantages of HSE include no additional training cost for acquiring multiple base models and applicability to any types of deep networks without tuning of network architectures.
Article
Nanoscience & Nanotechnology
A. S. Makarov, G. V. Afonin, R. A. Konchakov, V. A. Khonik, J. C. Qiao, A. N. Vasiliev, N. P. Kobelev
Summary: By introducing a dimensionless order parameter 4, the structural order of glass can be estimated, and this parameter shows a strong correlation with the glass-forming ability.
SCRIPTA MATERIALIA
(2024)
Article
Chemistry, Physical
A. S. Makarov, R. A. Konchakov, J. C. Qiao, A. N. Vasiliev, N. P. Kobelev, V. A. Khonik
Summary: This study investigates the relationship between defect concentration and the structure factor of glasses based on shear modulus measurements and molecular dynamics simulation. The results show that defect-induced disordering is independent of glass thermal prehistory above the glass transition temperature, while significant differences exist between initial and relaxed samples below the transition temperature.
Article
Chemistry, Physical
Dmitry Merson, Mikhail Linderov, Alexander Brilevsky, Alexey Danyuk, Alexei Vinogradov
Summary: The tensile behavior of a biocompatible alloy in a fine-grained state was investigated using acoustic emission (AE) measurements. It was found that the AE method is an effective tool for in situ monitoring of the dynamic recrystallization (DRX) process.
