Article
Engineering, Mechanical
Shuang Li, Haining Lu, Yanli Jin, Pengfei Sun, Xiaohua Huang, Zhiwu Bie
Summary: The study proposed an improved dual-parameter PD model (UDPD) to address the issues in damage and fracture analysis of quasi-brittle materials. Through numerical tests and comparisons, it was found that the model has simplicity and stability, and can effectively capture the nonlinear deformation and progressive failure of quasi-brittle materials with different Poisson's ratios.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2021)
Article
Engineering, Multidisciplinary
Zediao Chen, Feng Liu
Summary: Crack propagation in brittle materials is crucial for structural safety evaluation and has wide-ranging impacts. The particle Discontinuous Deformation Analysis (DDA) is an effective method for modeling and understanding the complex behavior of cracks in brittle materials under static and dynamic loadings. By carefully investigating various stress and geometric conditions, the particle DDA can accurately reproduce crack propagation patterns and provide valuable insights into the fracture mechanism of materials.
CMES-COMPUTER MODELING IN ENGINEERING & SCIENCES
(2023)
Article
Engineering, Mechanical
Yousef Jafaraghaei, Tiantang Yu, Tinh Quoc Bui
Summary: This paper presents numerical simulation of the dynamic failure process of Duran 50 glass plates under high-velocity impact loads using bond-based peridynamics. Several affecting parameters are considered and their effects on damage, reaction force, and coefficient of restitution are examined. The study establishes functional relationships among various variables and validates the simulation results with existing experimental data.
THEORETICAL AND APPLIED FRACTURE MECHANICS
(2022)
Article
Engineering, Multidisciplinary
Chun Feng, Xinming Liu, Qindong Lin, Shihai Li
Summary: In this study, a simple particle-spring system is proposed to simulate the cracking processes of brittle materials and capture continuous-discontinuous processes. Numerical studies show that the model is reliable and robust compared to the traditional FEM model.
ENGINEERING ANALYSIS WITH BOUNDARY ELEMENTS
(2022)
Article
Mechanics
Jonas Rudshaug, Odd Sture Hopperstad, Tore Borvik
Summary: To develop accurate material models for glass, reliable experimental procedures are needed to capture the stochastic nature of the material. In this study, we conducted experiments on different windshields under quasi-static loading to reveal their stochastic behavior. We used 3D-Digital Image Correlation (3D-DIC) and high-speed cameras combined with pose estimation-based post-processing to monitor displacement field and capture fracture initiation and crack propagation data. Finite element simulations were also performed to estimate major principal stress values. The results from this study provided valuable data for the development of numerical models.
ENGINEERING FRACTURE MECHANICS
(2023)
Article
Chemistry, Physical
Chengjun Le, Xuhua Ren, Haijun Wang, Shuyang Yu
Summary: This paper investigates the stress analysis of a circular hole with three-dimensional internal cracks using 3D internal laser-engraved crack technology. The experimental results show that the presence of internal cracks reduces the cracking and breaking load of the specimen. Compared to the mainstream method, this technology offers advantages in terms of brittleness, crack authenticity, stress field visualization, and fracture characteristics.
Article
Mathematics, Interdisciplinary Applications
Sahir N. Butt, Gunther Meschke
Summary: The study investigates the influence of the peridynamic horizon on dynamic fracture processes in brittle solids using two and three-dimensional simulations. The predicted crack speed and crack surface characteristics are compared with experimental observations to validate the simulation results. Additionally, the influence of specimen size on dynamic fracture processes is explored through two-dimensional peridynamic simulations, comparing fracture strengths and velocity toughening relationships with results from linear elastic fracture mechanics and experiments.
COMPUTATIONAL MECHANICS
(2021)
Article
Mechanics
Zhenyu Han, Jianchun Li, Haijun Wang, Jian Zhao
Summary: This paper investigates the 3D crack growth under dynamic compression through a series of tests on cubic glass specimens. The results show that the dynamic compressive strength of the specimen is influenced by the inclination direction of the 3D pre-crack. Theoretical analysis reveals the mechanism behind crack initiation and favorable direction, considering factors such as non-singular T stress and friction between crack planes.
ENGINEERING FRACTURE MECHANICS
(2023)
Article
Materials Science, Multidisciplinary
Gyubaek An, Jeongung Park, Hongkyu Park, Ilwook Han
Summary: High-manganese austenitic steel has an austenite structure formed by increasing Mn content, and is alloyed with elements to increase cryogenic toughness. It can be applied to large offshore and onshore LNG storage tanks in cryogenic conditions.
Review
Mechanics
Yanan Sun, Michael G. Edwards, Bin Chen, Chenfeng Li
Summary: This paper provides a state-of-the-art review of crack branching, including experimental observations, physics, fracture models and associated numerical methods. The discussion highlights the key features, advantages and limitations of crack models, as well as a detailed review of numerical methods used to simulate crack branching. Finally, the future research directions for crack branching modeling are discussed based on the information reviewed in the paper.
ENGINEERING FRACTURE MECHANICS
(2021)
Article
Mathematics, Interdisciplinary Applications
Stefan Loehnert, Christian Krueger, Verena Klempt, Lukas Munk
Summary: This paper presents an enriched phase-field method for the simulation of 2D fracture processes, which has the potential to greatly reduce computational cost compared to the classical phase-field method. The method combines a phase-field approach with an ansatz transformation and an enrichment technique, allowing for the application of coarser meshes while still obtaining accurate solutions. Unlike classical XFEM / GFEM, this method simplifies the simulation of crack initiation, propagation, and coalescence by not requiring level set techniques or explicit representations of crack geometries.
COMPUTATIONAL MECHANICS
(2023)
Article
Engineering, Multidisciplinary
Zeyuan Zhou, Ming Yu, Xinfeng Wang, Zaixing Huang
Summary: This paper presents a new nonlocal continuum formulation called Peridynamics, which can predict crack nucleation, branch, and propagation in materials and structures using a meshfree discrete technique. The motion equation of Peridynamics with boundary traction is improved by simplifying the boundary transfer functions. The critical cracking load and fracture angles of a plate with multiple cracks under uniaxial tension are calculated, and the results are consistent with classical fracture mechanics. The fracture mode and crack propagation path are also determined. The calculation demonstrates that the peridynamic motion equation with boundary conditions can conveniently and accurately simulate the brittle fracture process in a plate with multiple cracks.
CMES-COMPUTER MODELING IN ENGINEERING & SCIENCES
(2023)
Article
Engineering, Mechanical
Chunyu Li, Youjun Ning, Xinlian Liu
Summary: In this study, a sub-block element DDA method is used to simulate crack evolution in brittle materials under dynamic loading. The method is validated through numerical examples and shows good agreement with experimental results or other numerical methods.
THEORETICAL AND APPLIED FRACTURE MECHANICS
(2022)
Article
Construction & Building Technology
Mina Iskander, Nigel Shrive
Summary: Flaws play a crucial role in crack initiation and propagation in solids. The geometry of pre-existing flaws and the position of secondary voids can significantly impact crack propagation. The study provides insights into the effects of porosity on compressive strength and Strain Gradient Effect in materials like concrete and masonry.
CONSTRUCTION AND BUILDING MATERIALS
(2021)
Article
Engineering, Multidisciplinary
Moirangthem Dinachandra, Alankar Alankar
Summary: An adaptive refinement scheme is proposed in this study to reduce the complexity and cost of computations in phase-field models, and the effectiveness of the method is successfully demonstrated.
COMPUTER METHODS IN APPLIED MECHANICS AND ENGINEERING
(2022)
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
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)
