Article
Engineering, Geological
Asa Fransson, Giulio Viola
Summary: Deformation zones and fractures play a significant role in engineering and rock mechanical- and hydraulic behavior characterization. Structural mapping is crucial for identifying fracture sets and properties, investigating scale conformity, and integrating hydrogeological observations for accurate rock mechanical modeling. The BRIE experiment in Sweden's Aspo Hard Rock Laboratory demonstrated the successful integration of structural mapping with multidisciplinary investigations to understand natural and induced rock stresses.
ENGINEERING GEOLOGY
(2021)
Article
Computer Science, Information Systems
Mohamed Soufiane Jouini, Fateh Bouchaala, Mohamed Kamel Riahi, Mohamed Sassi, Hamid Abderrahmane, Fawaz Hjouj
Summary: Characterizing heterogeneity in reservoir rocks at the pore scale is crucial to understanding flow patterns and estimating reservoir petrophysical properties. This study introduces multifractals as descriptors for rock samples' heterogeneity and finds correlations between certain parameters and porosity and permeability. Additionally, multifractal parameters are able to classify groups of rock samples based on their degree of heterogeneity.
Article
Environmental Sciences
Tomos Phillips, Tom Bultreys, Kevin Bisdom, Niko Kampman, Stefanie Van Offenwert, Arjen Mascini, Veerle Cnudde, Andreas Busch
Summary: This study systematically examined the impact of roughness on fluid flow properties of fractures by 3D printing fractures with controlled surface roughness. The experiments showed that roughness enhances void space persistence and fluid flow, with rougher fractures exhibiting significant permeability increases. Below 20 micrometers, fracture contact area was found to be a better predictor of permeability than roughness. Such findings are crucial for models predicting fracture flow in the deep subsurface.
WATER RESOURCES RESEARCH
(2021)
Article
Construction & Building Technology
Yong Niu, Guangjian Liu, Zhen Zhong, Jinguo Wang, Ranran Zhang, Bolong Liu
Summary: An extended non-ordinary state-based peridynamic (NOSB-PD) theory is used to study the fracture characteristics of rock-like materials with intermittent flaws under compressive-shear loading. The theory integrates stress-based failure criteria, namely the maximum tensile stress criterion and the Mohr-Coulomb criterion, to determine the tensile and shear failures of flawed rock-like materials. The distribution characteristics of maximum principal stress and shear stress obtained by the NOSB-PD theory are employed to analyze the fracture failure mechanism. The numerical results are validated by experimental data, indicating the capability of the extended NOSB-PD theory in simulating fracture processes under compressive-shear loading.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Article
Engineering, Geological
Y. Y. Zhou, B. Yu, W. Fan, T. A. Dijkstra, Y. N. Wei, L. S. Deng
Summary: The study investigates the development of localized shear failure in Malan loess through laboratory triaxial shear test and X-ray micro-computed tomography. It is found that multiple undulating fracture surfaces gradually increase until a dominant shear failure plane is formed. The shear band of finite thickness has an increasing macroporosity. These findings provide important insights into the multi-scale modelling of loess mechanical behavior.
ENGINEERING GEOLOGY
(2023)
Article
Materials Science, Multidisciplinary
Thomas Tancogne-Dejean, Christian C. Roth, Thilo F. Morgeneyer, Lukas Helfen, Dirk Mohr
Summary: This study investigates the fracture mechanism of aluminum alloy AA2024-T3 under shear loading using X-ray synchrotron laminography, revealing the microscale defects population and their evolution, and proposing a specific fracture mechanism based on these observations.
Article
Engineering, Electrical & Electronic
Yuan Gao, Hui Tang, Rongjun Ge, Jin Liu, Xin Chen, Yan Xi, Xu Ji, Huazhong Shu, Jian Zhu, Gouenou Coatrieux, Jean-Louis Coatrieux, Yang Chen
Summary: Orthopedic spine disease is a common condition that often requires accurate diagnosis using orthopedic computed tomography (CT) image data. However, in some situations where 3-D imaging equipment is lacking or time is limited, a method based on 2-D x-ray images is needed. In this study, a novel 3-D spine reconstruction technique called 3DSRNet is proposed. It utilizes a generative adversarial network (GAN) architecture and novel modules to achieve accurate and efficient reconstruction by integrating local bone surface information, long-range relation spinal structure information, and spine texture features.
IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT
(2023)
Article
Engineering, Geological
M. A. Pirzada, M. Bahaaddini, M. S. Andersen, H. Roshan
Summary: The hydraulic conductivity of rock joints is a crucial factor in controlling fluid flow in rock engineering applications. This study investigates the effects of shearing and normal loading on the hydraulic conductivity of rock joints, which is mainly influenced by hydraulic aperture. Through a series of experiments, the evolution of joint aperture and contact area is explored. The results show that the joint conductivity is closely related to the mean hydraulic aperture of joint profiles, and damaged asperities hinder fluid flow during shearing experiments. The trend in contact area closely follows the flow rate, and even at high normal stresses, full contact is not physically possible. A new correlation is proposed to accurately estimate experimental flow rates under different loading conditions.
ROCK MECHANICS AND ROCK ENGINEERING
(2023)
Article
Computer Science, Interdisciplinary Applications
Liang Wang, Qinghua Lei
Summary: This study introduces a dual-scale fracture network model to simulate the distribution of large and small fractures in fractured geological media. By discriminating between different length scales and using upscaling treatment, the model accurately calculates the bulk properties of the rock mass.
COMPUTERS AND GEOTECHNICS
(2021)
Article
Green & Sustainable Science & Technology
Musa D. Aliyu, Rosalind A. Archer
Summary: This paper presents a new three-dimensional numerical model of a hot dry rock geothermal reservoir and analyzes two case studies to determine the impact of different factors on reservoir performance, showing that wellbore placement significantly affects reservoir performance.
Article
Engineering, Geological
Hongdan Yu, Weizhong Chen, Zhe Gong, Xianjun Tan, Diansen Yang
Summary: This study conducted undrained loading-unloading triaxial tests on undisturbed specimens of Boom Clay to investigate its thermo-hydro-mechanical behavior at high temperatures. The results showed that temperature elevation weakened the strength of Boom Clay and both initial mean effective stress and temperature affected its loading-unloading elastic modulus. The stress-strain hysteresis loops of Boom Clay were found to be closely related to its high content of adsorbed water and influenced by friction resistance and viscous resistance.
INTERNATIONAL JOURNAL OF ROCK MECHANICS AND MINING SCIENCES
(2021)
Article
Construction & Building Technology
Xiaoyu Zhao, Wei Dong, Binsheng Zhang, Yiming Wang
Summary: To investigate the fracture properties of the rock-concrete interface after fatigue loading, fatigue tests were carried out under three-point bending loading. The results showed that interfacial crack did not initiate if the applied maximum fatigue load was lower than the initial cracking load under quasi-static loading. However, microcracks would occur and accumulate during the fatigue process, generating a larger damage area. A distribution model of the nominal initial fracture toughness along the interfacial ligament was derived for the fatigued specimens, and a crack propagation criterion based on the nominal initial fracture toughness was proposed and validated.
JOURNAL OF MATERIALS IN CIVIL ENGINEERING
(2023)
Article
Engineering, Geological
Wen-Jie Xu, Hai-Yang Zhang
Summary: Soil-rock mixtures (S-RMs) are composed of large rock blocks and fine soil particles, exhibiting complex physical and mechanical behaviors. This study used CT image sequences and a 3D Meso-Structure Reconstruction and Analysis System (MSRAS(3D)) to investigate the deformation and failure mechanisms of S-RMs. The results revealed the influence of rock block breakage on the strength and p-q curve of S-RMs, suggesting a modified Mohr-Coulomb strength relationship in the form of a power function.
Article
Biotechnology & Applied Microbiology
Shenghui Wu, Wei Wang, Ruiyang Li, Jingyi Guo, Yu Miao, Guangyi Li, Jiong Mei
Summary: A new measurement method was designed to assess the injury degree of the femoral head in patients with FHFs and investigate its association with FNFs. The 2D and 3D parameters were found to be feasible adjunctive diagnostic tools in identifying FNFs.
FRONTIERS IN BIOENGINEERING AND BIOTECHNOLOGY
(2023)
Article
Engineering, Chemical
Jose Ricardo Assuncao Godinho, Shuvam Gupta, Camila Guimaraes da Silva Tochtrop, Raissa Demanou Tekeng, Matthew Hicks, Doreen Ebert, Jaakko Ihanus, Antti Roine, Jussi Liipo, Axel D. Renno
Summary: The main techniques currently used for characterizing raw materials are bulk or 2D methods, and there is a lack of standardized and automated methods for 3D characterization of particulate materials. In this study, X-ray computed tomography was used to characterize crushed chromite ore with nine particle size classes below 1 mm. The workflow showed consistent accuracy and can be automated with limited user input. It offers potential advantages over traditional 3D image processing methods in terms of automation, accuracy, and standardization.
MINERALS ENGINEERING
(2023)
Article
Chemistry, Multidisciplinary
Yongjun Zhang, Sijia Liu, Miaomiao Kou, Zaiquan Wang
APPLIED SCIENCES-BASEL
(2020)
Review
Engineering, Mechanical
Xiao-Ping Zhou, Yun-Teng Wang
Summary: Peridynamic theory, an integral-type nonlocal continuum mechanics theory, has been successfully used to simulate mechanical responses of materials with discontinuous structures and demonstrate various discontinuous phenomena in engineering and sciences. The review illustrates the successful results and potential capability of PD theory in geotechnical engineering, showing its applications and future research perspectives in this field.
JOURNAL OF ENGINEERING MECHANICS
(2021)
Article
Mechanics
Miao-Miao Kou, Xin-Rong Liu, Zai-Quan Wang, Shan-Ding Tang
Summary: This article investigates the coupled hydro-mechanical failure, energy and permeability of fissured rock-like specimens under triaxial compression through a series of laboratory experiments. The study reveals the influences of internal seepage pressure, confining pressure and inclination angle on crack initiation and propagation, deformation characteristics, ultimate fracture networks, permeability evolution and energy evolution during the progressive failure processes. The experimental results and failure mechanism provide a deep understanding for monitoring and controlling rock stability in geological engineering projects under coupling seepage-stress environments.
ENGINEERING FRACTURE MECHANICS
(2021)
Article
Mechanics
Miao-Miao Kou, Xin-Rong Liu, Zai-Quan Wang, Mohsen Nowruzpour
Summary: This study experimentally investigated the failure mechanism and permeability evolution in fissured rock-like specimens under coupled hydromechanical conditions. The results showed that the nucleation of secondary cracks is influenced by the initial unloading state and hydraulic pressure levels. Additionally, quantitative relationships between 3-D fractal dimensions, mechanical strengths, and permeability were established to understand the coupled hydromechanical unloading failure mechanism.
ENGINEERING FRACTURE MECHANICS
(2021)
Article
Mechanics
Yun-Teng Wang, Xiang Zhang, Xian-Shan Liu
Summary: This study demonstrates the feasibility and value of four machine learning approaches for analyzing and predicting Mode-I fracture toughness of rocks, with the random regression forest being more suitable for predicting toughness in ISRM-suggested CCNBD rock tests. The reliable functionality and rapid development of machine learning solutions have shown significant improvement over previous analytical and empirical solutions.
ENGINEERING FRACTURE MECHANICS
(2021)
Article
Engineering, Multidisciplinary
Sijia Liu, Yunteng Wang, Chong Peng, Wei Wu
Summary: A new phase field model is proposed to simulate mixed-mode fracture phenomena in rock-like materials, which has been successfully validated. The model can capture different fracture modes, providing stable numerical results and fast numerical convergence.
COMPUTER METHODS IN APPLIED MECHANICS AND ENGINEERING
(2022)
Article
Computer Science, Interdisciplinary Applications
Xiao-Ping Zhou, Er-Bao Du, Yun-Teng Wang
Summary: This paper proposes a thermo-hydro-chemo-mechanical coupling peridynamic model for fractured rock mass to simulate fluid-driven crack, water pressure, and temperature characteristics. The model is validated by comparing with analytical solutions and previous numerical results, and shows good agreement with results obtained by the phase field method. The model is also used to simulate geothermal extraction process and investigate water pressure and thermal field distribution.
COMPUTERS AND GEOTECHNICS
(2022)
Article
Multidisciplinary Sciences
Mingliang Li, Jing Zheng, Xiaoge Wang, Runze Yu, Yunteng Wang, Yi Qiu, Xiang Cheng, Guozhi Wang, Gang Chen, Kefeng Xie, Jinyao Tang
Summary: Researchers have successfully designed and synthesized a new organic semiconductor material, AZO-BTBT-8, which utilizes strain engineering to improve the carrier mobility of the material. The photoisomerization of AZO-BTBT-8 induces lattice strain in thin-film devices, leading to exceptional device performance enhancement. Based on this, a large-scale flexible organic field-effect transistor (OFET) device array has been fabricated, achieving high-resolution UV imaging and reversible light response.
NATURE COMMUNICATIONS
(2022)
Article
Mathematics, Interdisciplinary Applications
Bram van der Heijden, Yunteng Wang, Gilles Lubineau
Summary: This paper proposes a data-driven approach to predict mechanical responses for structures directly from full-field observations obtained on previously tested structures. The approach uses raw data, called patches, comprising displacement fields obtained during data harvesting through full-field measurement. A library of such patches is compiled to compute responses for new structures, and the approach is not limited to specific types of structures or mechanics.
COMPUTATIONAL MECHANICS
(2023)
Article
Computer Science, Interdisciplinary Applications
Shuyu Wang, Linjuan Wang, Yunteng Wang
Summary: In this paper, a peridynamic model is proposed to investigate the influence of material heterogeneity on blast-induced crack initiation and propagation in brittle rock. The introduction of discretization in polar coordinates helps to avoid misleading directional guidance to crack initiation. The results demonstrate that the locations and sequence of crack initiation are determined by material heterogeneity, and cracks tend to propagate in rock with stronger heterogeneity.
COMPUTERS AND GEOTECHNICS
(2023)
Article
Materials Science, Multidisciplinary
Yunteng Wang, Ronaldo I. Borja, Wei Wu
Summary: We propose a new phase-field formulation to model the formation and propagation of compaction bands in high-porosity rocks. This formulation takes into account the effects of inertia on the rate of development of compaction bands, as well as degradation mechanisms in tension, compression, and shear. We also present a robust numerical technique to handle the spatiotemporal formation and evolution of the compaction band, and validate the model using a benchmark problem involving a notched cylindrical specimen of Bentheim sandstone.
JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS
(2023)
Article
Engineering, Multidisciplinary
Yunteng Wang, Wei Wu
Summary: This paper focuses on the numerical simulation of mixed mode fracture in rocks. A bond-level energy-based peridynamic model is developed, which includes a dilatation function to capture both volumetric and deviatoric deformations. Nonlocal stresses are then defined to obtain forces that correspond to the deformations. A new failure model is proposed to connect computational peridynamics with phenomenological failure criteria, making it applicable to both brittle and quasi-brittle rocks. Several numerical examples are presented to demonstrate the effectiveness of the model.
COMPUTER METHODS IN APPLIED MECHANICS AND ENGINEERING
(2023)
Article
Engineering, Mechanical
Sijia Liu, Yunteng Wang, Wei Wu
Summary: We propose a modified phase-field model for cohesive interface failure in quasi-brittle solids, which includes a traction-separation-damage law for damage process and an energetic degradation function controlled by critical gap ratio. This modification provides an attractive approach for simulating the cohesive interface failure process. We also provide a robust numerical solution strategy for the spatio-temporal evolution of cohesive interface failure. The model is validated by benchmark problems and applied to study the complex failure mechanism of a peeling test and crack impinging on interfaces in different scenarios.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2023)
Article
Engineering, Civil
Miaomiao Kou, Jing Bi, Binhang Yuan, Yunteng Wang
STRUCTURAL ENGINEERING AND MECHANICS
(2020)
Article
Computer Science, Interdisciplinary Applications
Yongjun Zhang, Sijia Liu, Miaomiao Kou, Zaiquan Wang
COMPUTERS AND GEOTECHNICS
(2020)
Article
Engineering, Mechanical
Zhuang Sun, Yixin Zhao, Yirui Gao, Sen Gao, Davide Elmo, Xindong Wei
Summary: In this study, the modified semi-circular bending test was used to investigate the fracture toughness of coal samples with different sizes and bedding angles. The results showed that the fracture toughness of coal exhibits size effect and anisotropy. The crack initiation and propagation in hydraulic fracturing of coal seam can be influenced by bedding angles.
THEORETICAL AND APPLIED FRACTURE MECHANICS
(2024)
Article
Engineering, Mechanical
Ruiming Zhang, Kai Ma, Wenzhu Peng, Jinyang Zheng
Summary: The fatigue crack growth rates of 4130X steel in different hydrogen concentrations were measured, and the influence of hydrogen on crack behavior was analyzed. Results show that the crack growth rate increases with increasing hydrogen pressure, reaching a threshold at 87.5 MPa.
THEORETICAL AND APPLIED FRACTURE MECHANICS
(2024)
Article
Engineering, Mechanical
Hien Do, Phuc L. H. Ho, Canh V. Le, H. Nguyen-Xuan
Summary: In this study, a new method for determining the limit loads of fracture structures using the pseudo-lower bound method with adaptive quadtree meshes is proposed. The method overcomes the volumetric locking problem and handles the challenge of hanging nodes during refinement procedure by using quadtree meshes. The effectiveness of the approach is demonstrated through numerical validation.
THEORETICAL AND APPLIED FRACTURE MECHANICS
(2024)
Article
Engineering, Mechanical
Weimin Song, Yuxin Fan, Hao Wu, Liang Zhou
Summary: This study proposed a novel test method to characterize the I-II mixed fracture toughness of asphalt pavement and investigated the effects of reclaimed asphalt pavement (RAP) and loading rate. The results showed that loading rate and inclusion of RAP had positive effects on fracture toughness.
THEORETICAL AND APPLIED FRACTURE MECHANICS
(2024)
Article
Engineering, Mechanical
Zida Liu, Diyuan Li, Jianqiang Xia, Quanqi Zhu
Summary: In this study, the influence of flaw inclinations on the failure mechanism of fissured granite specimens was analyzed through a series of experiments. A quantitative method combining deep learning and scanning electron microscope was employed to identify the mesoscopic fracture mechanism of macroscopic cracks. The results indicated that the failure of fissured specimens was mainly caused by tensile stress and shear stress.
THEORETICAL AND APPLIED FRACTURE MECHANICS
(2024)
Article
Engineering, Mechanical
Jiabing Zhang, Yiling Chen, Ronghuan Du, Xianglian Zhao, Jun Wu
Summary: This study investigated the mechanical characteristics and crack propagation behavior of sandstone-like samples with single cracks under freeze-thaw cycles. The results demonstrated the significant effects of crack angle and freeze-thaw cycles on the compressive strength and stability of the samples. Confining pressure inhibited the freeze-thaw deterioration, and the acoustic emission signals exhibited good consistency with the stress-strain curves. The simulation results matched well with the experimental results, and five crack propagation modes were proposed.
THEORETICAL AND APPLIED FRACTURE MECHANICS
(2024)
Article
Engineering, Mechanical
Felix Boedeker, Pauline Herr, Anders Biel, Ramin Moshfegh, Stephan Marzi
Summary: Cohesive Zone Models with finite thickness are widely used for fracture mechanical modeling. Computational homogenization techniques are crucial for the development of advanced engineering materials. FFT-based homogenization scheme shows potential in reducing computational effort and has practical applications.
THEORETICAL AND APPLIED FRACTURE MECHANICS
(2024)
Article
Engineering, Mechanical
Sobhan Pattajoshi, Sonalisa Ray, Yugal Kishor Joshi
Summary: In this work, a novel multi-layer composite structure is proposed for protective shelter design. The dynamic behavior and mechanical performance of the multi-layer composite under projectile impact loading are investigated. The proposed composite target demonstrates enhanced penetration resistance and lesser damage compared to its reinforced concrete monolayer counterpart. An analytical model is also developed to predict the forces transmitted to the lowest layer for design purposes.
THEORETICAL AND APPLIED FRACTURE MECHANICS
(2024)
Article
Engineering, Mechanical
H. M. Shodja, M. T. Kamali, B. Shokrolahi-Zadeh
Summary: This study proposes a semi-analytical method for calculating the stress intensity factor of an internally pressurized eccentric annular crack. By using hypersingular integral equations and conformal mapping, accurate values of SIFs along the crack edges can be obtained. The material properties of the elastic matrix do not affect the SIF values, as demonstrated through the investigation of geometric parameters.
THEORETICAL AND APPLIED FRACTURE MECHANICS
(2024)
Article
Engineering, Mechanical
Wen Hua, Zhanyuan Zhu, Wenyu Zhang, Jianxiong Li, Jiuzhou Huang, Shiming Dong
Summary: Accurate assessment and prediction of fracture behavior in cracked materials using mixed mode fracture criteria are crucial in fracture mechanics. This study comprehensively reviewed modified fracture criteria that incorporate T-stress for mixed mode I-II cracks. A comparative analysis was conducted between experimental results and theoretical predictions for five different cracked configurations. The study also discussed the effect of T-stress on crack initiation angle and fracture toughness, providing suggestions. The results showed variations in predictive accuracy across different cracked configurations due to disparities in T-stress. However, similar predictions were observed for semi-circular bend and edge-crack triangular specimens due to their similar biaxial stress ratio B. Different fracture criteria were suitable for different cracked configurations with positive or negative T-stresses.
THEORETICAL AND APPLIED FRACTURE MECHANICS
(2024)
Article
Engineering, Mechanical
Qing-qing Shen, Qiu-hua Rao, Wei Yi, Dian-yi Huang
Summary: This study proposes a theoretical approach to forecast multi-crack propagation trajectories in a finite plate. By calculating the stress intensity factor (SIF) and analyzing the influence of crack size, the criteria for crack initiation and propagation in a finite plate are established. Experimental results demonstrate that the SIF of multiple cracks in a finite plate is consistently larger than that of an infinite plate.
THEORETICAL AND APPLIED FRACTURE MECHANICS
(2024)
Article
Engineering, Mechanical
Songbai Li, Qiyun Zhu, Zhizhong Lu, Hongzhi Yan, Chu Zhu, Peize Li
Summary: This study investigates the effects of laser heating and laser shot peening on fatigue life of AA2524, and predicts the fatigue life using artificial neural networks and support vector regression models. The results show that laser heating and laser shot peening can significantly improve the fatigue life, and the neural networks have better prediction ability.
THEORETICAL AND APPLIED FRACTURE MECHANICS
(2024)
Article
Engineering, Mechanical
V. Shlyannikov, A. Sulamanidze, D. Kosov
Summary: This paper presents experimental crack-growth data for thermomechanical fatigue conditions in nickel-based alloy components. The crack-growth experimental results are interpreted using finite element analyses and multi-physics numerical calculations. The results show that crack growth rate is slower under isothermal pure fatigue conditions, while it is faster under thermomechanical cyclic deformation conditions.
THEORETICAL AND APPLIED FRACTURE MECHANICS
(2024)
Article
Engineering, Mechanical
Tairui Zhang, Xin Ma, Bin Yang, Wenchun Jiang, Zhiqiang Ge, Xiaochao Liu
Summary: This study experimentally investigated the fracture toughness distributions in dissimilar metal welds. The predictions of fracture toughness were made using three criteria and an energy release rate model. The results showed that using the critical strain criterion and ERR model resulted in higher consistency compared to mini-CTs, while the predictions using the critical stress criterion had high dispersion. The study also investigated the source of errors through damage developments and SEM observations.
THEORETICAL AND APPLIED FRACTURE MECHANICS
(2024)
Article
Engineering, Mechanical
Yike Dang, Zheng Yang, Xiaoyu Liu, Jianghao Guo
Summary: This study uses discrete element modeling to examine bedded rock failure with parallel defects. It is found that bedding influences crack propagation direction but has limited impact on final failure. Shear failure accumulates at the bridge area and defect tip, while tensile failure occurs during nucleation region development.
THEORETICAL AND APPLIED FRACTURE MECHANICS
(2024)