Article
Engineering, Geological
Kouqi Liu, Zhijun Jin, Natalia Zakharova, Lianbo Zeng, Meysam Haghshenas, Adedoyin Adeyilola, Suman Saurabh
Summary: This study compares fracture toughness values obtained by two less conventional methods, nanoindentation test and scratch test, and compares them with traditional laboratory techniques. The results show that fracture toughness values derived from these two methods are very similar, suggesting that they can be used to quickly evaluate fracture toughness from shale core intervals containing both intact and nonintact parts.
INTERNATIONAL JOURNAL OF ROCK MECHANICS AND MINING SCIENCES
(2023)
Review
Materials Science, Ceramics
S. Kasimuthumaniyan, Nitya Nand Gosvami, N. M. Anoop Krishnan
Summary: This review article provides a comprehensive overview of the experimental approaches to quantify and understand the scratch resistance of glasses. It highlights the fundamental difference between indentation hardness and scratch hardness values, and discusses the behavior of glasses under various environmental conditions. The review also outlines various scratch quantification models available in the literature, and details the scratch experiments performed on glasses and the role of different environmental conditions.
CERAMICS INTERNATIONAL
(2021)
Editorial Material
Statistics & Probability
Muxuan Liang, Ying-Qi Zhao
Summary: In this study, we discussed the improvement of generalizability in individualized treatment rules and introduced a likelihood-ratio-based method LR-ITR to handle covariate shifts. Numerical studies showed that LR-ITR outperformed CTE-DR-ITR in cases of covariate shift only.
JOURNAL OF THE AMERICAN STATISTICAL ASSOCIATION
(2021)
Article
Chemistry, Multidisciplinary
S. N. Korobeynikov
Summary: Recent studies have shown that the classical approach used by Namnabat et al. poorly simulates the mechanical moduli of graphene, especially the bending rigidity modulus. However, a modified version of this approach, as presented in Int J Eng Sci 133: 109-131, can accurately reproduce the mechanical moduli of graphene.
Article
Materials Science, Coatings & Films
A. R. Shugurov, E. D. Kuzminov
Summary: The mechanical properties, adhesion, and wear resistance of Ti0.41Al0.48Ta0.11N monolithic coating and Ti0.41Al0.48Ta0.11N/Ti0.45Al0.55 and Ti0.41Al0.48Ta0.11N/Ta multilayers were investigated. The multilayer coatings showed lower mechanical properties but stronger adhesion and improved wear resistance.
SURFACE & COATINGS TECHNOLOGY
(2022)
Article
Construction & Building Technology
Ange-Therese Akono, Jiaxin Chen, Mimi Zhan, Surendra P. Shah
Summary: The study compared the basic creep and fracture response of fine recycled aggregate concrete with natural sand mortar. Fine recycled concrete aggregate mortar shows higher micropores volume fraction and lower density calcium silicate hydrates. The macroscopic logarithmic creep modulus of fine recycled concrete aggregate mortar is significantly lower than that of natural sand mortar, while the fracture toughness is slightly lower compared to plain concrete.
CONSTRUCTION AND BUILDING MATERIALS
(2021)
Letter
Oncology
Sarah Badaoui, Andrew Rowland, Michael J. Sorich, Ashley M. Hopkins
Summary: This letter to the editor emphasizes additional analyses needed to supplement the study by Rugo et al. on Abemaciclib treatment for HR+/HER2- breast cancer.
Article
Engineering, Multidisciplinary
Jan David Huebsch, Philipp Laurens Rosendahl, Christian Mittelstedt
Summary: An analytical finite fracture mechanics model is developed for pressurized blister tests, showing good agreement with stress solution and energy release rate from Finite Element Analysis. Experimental blister tests at different temperatures were conducted, leading to a failure model applicable to various temperature ranges.
COMPOSITES PART B-ENGINEERING
(2021)
Article
Engineering, Mechanical
Susong Yang, Weiping Hu, Zhixin Zhan, Jian Li, Chunyu Bai, Qiang Yang, Qingchun Meng
Summary: This study systematically investigates the influence of scratches on the fatigue performance of cast aluminum alloy and develops a novel fatigue damage model based on continuum damage mechanics. The model provides an accurate evaluation of the fatigue performance of components with scratches.
INTERNATIONAL JOURNAL OF FATIGUE
(2022)
Article
Psychology, Multidisciplinary
Michael R. Jackson
Summary: The survey sheds light on the perception of psychologists' roles in national security, but the data and authors' interpretations are subject to scrutiny.
AMERICAN PSYCHOLOGIST
(2021)
Article
Mechanics
Xiuhuai Xie, Qinkai Feng, Miao Zhang, Ningbo Liao
Summary: This study investigates the fracture properties and interfacial strengths of SiCO thin films using experiments and computational methods. It proposes an improved method for describing interfacial crack nucleation and propagation and evaluates the interfacial strength through scratch simulations. The results are in agreement with experimental data and successfully predict the influence of layer thickness on the interfacial strength of SiCO thin films.
ENGINEERING FRACTURE MECHANICS
(2023)
Article
Engineering, Mechanical
Chaolin Wang, Yu Zhao, Cong He, Jing Bi
Summary: In this study, a simple auxiliary device and particle flow code were used to conduct tension-shear tests on red sandstones. The results showed that the mechanical behaviors of the samples were affected by the sample height and base hollow diameter, and there was a transition from shear failure to hybrid tension-shear failure.
THEORETICAL AND APPLIED FRACTURE MECHANICS
(2022)
Article
Engineering, Mechanical
Beatriz Sanz, Jaime Planas, Victor Rey-de-Pedraza, Rafael Sancho, Jose M. Sancho, Francisco Galvez
Summary: This study presents an experimental and numerical analysis of the applicability of the Brazilian test in determining the tensile strength of UHPFRC. The results show that there is a local maximum stress in the Brazilian test, which is very close to the tensile strength. This local maximum can be detected by measuring the relative displacement of two points symmetric with respect to the diametral loading plane. Experimental results using a specially designed device validate the numerical simulations, demonstrating the accuracy and validity of the Brazilian test for determining the tensile strength of UHPFRC when sufficiently instrumented.
THEORETICAL AND APPLIED FRACTURE MECHANICS
(2022)
Editorial Material
Infectious Diseases
Nicholas J. DeVito, Henry Drysdale
Summary: This article points out major issues in a recent publication regarding the use of convalescent plasma for treating COVID-19, including unclear reporting and significant omissions in the trial context. These issues render the study's findings and conclusions misleading.
BMC INFECTIOUS DISEASES
(2022)
Article
Construction & Building Technology
Ragip Ince, Cenk Fenerli
Summary: In this study, the formulation of the two-parameter model based on the size effect was improved and tested using various specimens. The results showed slight differences among the formulas, except for the one that covered splitting specimens.
CONSTRUCTION AND BUILDING MATERIALS
(2022)
Article
Engineering, Geological
Xianfeng Song, Ole Morten Aamo, Pascal-Alexandre Kane, Emmanuel Detournay
Summary: This paper proposes a phenomenological model to explain the optimal weight-on-bit phenomenon in percussive drilling, attributing it to the increase of pseudo-stiffness at the bit-rock interface with increasing weight on bit. Experimental evidence suggests that drilling efficiency is closely related to this phenomenon.
ROCK MECHANICS AND ROCK ENGINEERING
(2021)
Article
Mechanics
Yue Gao, Emmanuel Detournay
Summary: Experimental evidence shows that the measured toughness increases with confining stress. However, interpreting the observed breakdown pressure relies on assuming uniform fluid pressure in the cracks and identifying the peak pressure with fracture initiation pressure. The model challenges these assumptions by considering fluid lag and hydraulic compliance, indicating that the actual toughness may be overestimated when the breakdown pressure is used to interpret it.
ENGINEERING FRACTURE MECHANICS
(2021)
Article
Mechanics
Zhi-Qiao Wang, Emmanuel Detournay
Summary: This paper investigates the motion of a liquid blister trapped between an elastic sheet and a rigid substrate, driven by a frictionless blade. The study aims to evaluate the force applied by the blade on the moving blister, with solutions depending on two controlling numbers. The results show that for small gaps, the force is dominated by viscous dissipation, while for larger gaps, the force depends on both toughness and gap size.
JOURNAL OF FLUID MECHANICS
(2021)
Article
Engineering, Geological
Emmanuel Detournay, Yera Hakobyan
Summary: The paper presents a KGD-type model for hydraulic fracture in weak, poorly consolidated rocks, with a key assumption that the hydraulic fields are quasi-stationary. The model shows the growth of fracture as a square root of time and the transition between early and late time asymptotic flow regimes.
INTERNATIONAL JOURNAL FOR NUMERICAL AND ANALYTICAL METHODS IN GEOMECHANICS
(2022)
Article
Engineering, Multidisciplinary
Zhi-Qiao Wang, Emmanuel Detournay
Summary: This paper investigates the dynamics of a liquid blister forced to advance between a thin elastic sheet and a rigid substrate by the dual action of a piston and a flat frictionless sleeve. The study focuses on the dependence of external driving force on blister velocity, fluid viscosity, elastic properties of the sheet, and interface toughness, with a particular emphasis on the Eshelbian nature of the horizontal driving force. The numerical and asymptotic solutions predict the scaled horizontal force on the moving liquid blister and highlight the importance of three key numbers in controlling the solution.
INTERNATIONAL JOURNAL OF ENGINEERING SCIENCE
(2022)
Article
Engineering, Geological
Arviandy G. Aribowo, Roeland Wildemans, Emmanuel Detournay, Nathan Van de wouw
Summary: This paper extends the drag (PDC) bit interface laws for homogeneous rocks to the transition between two rock layers with distinct mechanical properties. A model is formulated to establish the relationships between the weight-on-bit, torque-on-bit, depth-of-cut per bit revolution, and engagement parameter of the bit in the lower rock layer. The paper shows that the drilling efficiency depends nonlinearly on the bit engagement between the two rock layers.
INTERNATIONAL JOURNAL OF ROCK MECHANICS AND MINING SCIENCES
(2022)
Article
Mechanics
Yue Gao, Emmanuel Detournay
Summary: This paper describes a two-dimensional model of a hydraulic fracture propagating in a weakly consolidated, highly permeable reservoir rock during a waterflooding operation. The model highlights essential differences from conventional hydraulic fracturing treatments of oil and gas wells and reveals the non-monotonic evolution of injection pressure over time. Poroelasticity significantly affects the response of the system, increasing injection pressure and delaying the time at which the peak pressure occurs.
JOURNAL OF FLUID MECHANICS
(2021)
Article
Energy & Fuels
Kaixiao Tian, Emmanuel Detournay
Summary: This paper extends the class of models simulating self-excited vibrations in a rotary drilling system by considering different types of PDC bits, and proposes algorithms to address technical challenges. Linear stability analysis is based on geometric variations of the bit/rock engagement surfaces to determine critical rotation speeds for different stability regions.
JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING
(2021)
Article
Engineering, Manufacturing
Kaidong Chen, He Zhang, Nathan van de Wouw, Emmanuel Detournay
Summary: This paper introduces a method for describing the milled surface using a surface function and accurately computing the instantaneous undeformed chip thickness (IUCT). The method overcomes the inaccuracies of traditional models and shows promise for computing the IUCT in milling processes.
JOURNAL OF MANUFACTURING SCIENCE AND ENGINEERING-TRANSACTIONS OF THE ASME
(2022)
Article
Mathematics, Applied
He Zhang, Emmanuel Detournay
Summary: This paper analyzes the self-excited axial and torsional vibrations of rotary drilling systems using a complex mathematical model that combines the drilling structure with a rate-independent bit-rock interface law. By utilizing an algorithm to convert the system of PDE-ODEs into a system of coupled ODEs and linearizing the system for stability analysis, the paper concludes that the effects of damping on the stability of drilling system is generally negligible in the range of practical drilling parameters. Extensive parametric studies have shown that bit wearflats play a crucial role in delaying or suppressing torsional stick-slip oscillations.
COMMUNICATIONS IN NONLINEAR SCIENCE AND NUMERICAL SIMULATION
(2022)
Article
Mechanics
He Zhang, Jia-Liang Le, Emmanuel Detournay
Summary: This paper reports the results of scratch tests on three different rocks, showing the existence of three cutting regimes with different fragment shapes and specific energy-depth relationships. It also provides evidence from video recording and fractography to distinguish different failure modes.
ENGINEERING FRACTURE MECHANICS
(2022)
Article
Mechanics
Anthony Peirce, Emmanuel Detournay
Summary: The deflation dynamics of a fluid-driven fracture in a permeable elastic medium are investigated in this study. The research findings show that the deflation of the fracture is influenced by the leak-off characteristics of the porous medium and the stress intensity factor of the fracture. A numerical scheme is established to explore the deflation dynamics of plane strain hydraulic fractures, and scaling analysis reveals the existence of asymptotic power law behaviors for various quantities.
INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES
(2022)
Article
Mechanics
Anthony Peirce, Emmanuel Detournay
Summary: This paper discusses the construction of tip asymptotes for a hydraulic fracture in a permeable elastic medium. It describes the changing nature of the asymptotic fields during the arrest and recession phases of the fracture after fluid injection has ended. The paper shows that as the fracture deflates, the dominance of the linear elastic fracture mechanics tip asymptote shrinks, giving way to an intermediate asymptote. The front velocity affects the development of a linear asymptote at the fracture tip, with the intermediate asymptote reappearing. These universal multiscale asymptotes are crucial for determining the decaying stress intensity factor, transition from arrest to recession, and front velocity during recession using computational algorithms.
JOURNAL OF FLUID MECHANICS
(2022)
Article
Engineering, Geological
Jithin S. Kumar, Abhijit Chaudhuri, Emmanuel Detournay, Ramesh Kannan Kandasami
Summary: In this study, a model is proposed to analyze the deformation around a cylindrical cavity caused by fluid injection. The study investigates the solution in different phases and introduces a time-dependent permeation coefficient and four time-dependent variables to solve the problem. A parametric analysis of the influence of material stiffness and strength on the solution is conducted.
INTERNATIONAL JOURNAL FOR NUMERICAL AND ANALYTICAL METHODS IN GEOMECHANICS
(2023)
Article
Mechanics
Anthony Peirce, Emmanuel Detournay
Summary: This paper explores approximate 'sunset' similarity solutions for receding hydraulic fractures in permeable elastic media. It shows that the linear aperture of a receding hydraulic fracture has a linear asymptote and can be described by polynomial solutions. The paper also demonstrates that the sunset solution forms an attractor for a wide range of hydraulic fractures as they approach closure. Furthermore, the paper finds that the sunset solution is dependent on only one material parameter, the leak-off coefficient, which can be determined through laboratory or field measurements.
JOURNAL OF FLUID MECHANICS
(2022)
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)
