Article
Engineering, Mechanical
Apiwish Thongraksa, Pornkasem Jongpradist, Pruettha Nanakorn, Jukkrawut Tunsakul
Summary: In this study, an element-free Galerkin (EFG) method is developed for analyzing shear crack growth in brittle and quasi-brittle materials using a cohesive crack model. The method shows great potential in terms of verification and application.
THEORETICAL AND APPLIED FRACTURE MECHANICS
(2023)
Article
Chemistry, Physical
Fei Xue, Tian-Le Cheng, Yinkai Lei, You-Hai Wen
Summary: Modeling ductile fracture in polycrystalline structures is a challenging task, as it requires integrated modeling of cracks, crystal plasticity, and grains. This study presents two types of phase-field models for ductile fracture, with one incorporating three sets of order parameters and the other assuming J(2) plasticity for the whole system. The models are applied to investigate the influences of grain orientations, grain boundaries, and plastic strain on crack growth and fatigue life.
NPJ COMPUTATIONAL MATERIALS
(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, Mechanical
Hamidreza Abdolvand
Summary: This paper describes in detail the incorporation of four different microstructure-sensitive damage mechanisms into a crystal plasticity finite element model. The performance of each model in predicting crack nucleation and propagation is studied by comparing the numerical results with experimental data. The results show that for different specimen textures, the principal stress and maximum slip methods can correctly predict the location and propagation direction of major cracks, while the energy method or principal plastic strain method mainly coincide with minor cracks or those that propagate at higher applied strains.
INTERNATIONAL JOURNAL OF PLASTICITY
(2022)
Article
Energy & Fuels
Pengyu Wang, Shuhong Wang, Alipujiang Jierula, Zihan Sun
Summary: This study investigates the connection and bifurcation problems of rock crack propagation by inserting cohesive elements, and finds the best method for insertion. Results show that using the maximum principal stress criterion and displacement law can achieve the best simulation outcomes.
GEOMECHANICS AND GEOPHYSICS FOR GEO-ENERGY AND GEO-RESOURCES
(2021)
Article
Engineering, Multidisciplinary
Daniel Dias-da-Costa, Marcelo R. Carvalho, Milad Bybordiani
Summary: Many advanced methods have been developed for predicting discrete fracture within the finite element framework, with the goal of enhancing the continuous displacement field with a discontinuous part. These methods provide unprecedented versatility in discretising domains with prescribed and evolving boundaries, but can incur additional computational burden with global tracking schemes. A new method, the Cracked Zone Clustering Method (CZCM), is proposed to address these issues by introducing minimal enhanced degrees of freedom and decoupling the discretisation of bulk and cracks. Results show that CZCM can significantly reduce the required number of enhancement degrees of freedom while maintaining accuracy.
COMPUTER METHODS IN APPLIED MECHANICS AND ENGINEERING
(2021)
Article
Mechanics
M. Ciavarella, A. Papangelo, R. McMeeking
Summary: Since the 1970s, crack propagation in viscoelastic materials has been understood using Barenblatt cohesive models, with a crack speed typically depending on the stress intensity factor. The apparent toughness in semi-infinite cracks has been shown to increase from a threshold toughness w(0) at very low speeds to a fast fracture value at w(infinity). In bimaterial interfaces between elastic and viscoelastic materials, a cohesive model is applied with crack speed depending on viscosity and the stress intensity factor, while the maximum effective toughness enhancement is reduced in arbitrary viscoelastic materials with nonzero relaxed modulus.
ENGINEERING FRACTURE MECHANICS
(2021)
Article
Materials Science, Multidisciplinary
M. Ciavarella, T. Zhang, R. M. McMeeking
Summary: This study analyzes crack growth in viscoelastic material and computes the work done and dissipation per unit area of crack growth under applied load. The results suggest that crack growth models based on quantifying the dissipation per unit area are not applicable to components with finite geometry, while models based on a rupture process zone are easier to implement.
JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS
(2022)
Article
Mechanics
Shuang Li, Haining Lu, Xiaohua Huang, Rui Qin, Jinghang Mao
Summary: The research focuses on the brittle failure of components due to notches created during the design and manufacturing process. An extended Uni-bond Dual-parameter Peridynamic model was developed to investigate how notches influence the fracture and bearing capacity of brittle materials. Results show that blunt notches with a larger tip radius offer better performance in structural safety.
ENGINEERING FRACTURE MECHANICS
(2023)
Article
Engineering, Civil
Yiqiang Kang, Renshu Yang, Liyun Yang, Yongliang Li, Man Yao, Shirui Gu
Summary: This study investigates the influence of joints on rock fragmentation using tunnel boring machines. The indentation tests and digital image correlation method are employed to capture the process of rock fragmentation. Simulation based on cohesive element with zero thickness is conducted to simulate the failure process and evolution of jointed rock. It is found that the rock with joints is more easily broken than intact rock mass under the action of double cutters, and the joint acts as a weak interface in the rock mass. Finally, the rock mass is destroyed along the vertical joint, forming rock slag.
ARCHIVES OF CIVIL AND MECHANICAL ENGINEERING
(2023)
Article
Mechanics
Junchao Yang, Yuanfang Cheng, Songcai Han, Zhongying Han, Chuanliang Yan, Mingyu Xue, Zhenhai Liu, Fangyuan Chen
Summary: This study conducted Brazilian splitting tests on three types of rocks at different temperatures using a high-speed camera and DIC technology, and investigated the initiation and propagation characteristics of cracks from a mesoscopic perspective. The results demonstrate that temperature has a significant effect on the initiation and propagation of cohesive cracks, and observed changes in the characteristics of cohesive cracks at different temperatures.
ENGINEERING FRACTURE MECHANICS
(2022)
Article
Engineering, Chemical
Weihang Liu, Zhan Qu
Summary: This study measured the whole strain field of shale specimens with prefabricated holes and cracks under uniaxial compression through a uniaxial compression experiment and DIC technology. The fracture location and expansion path of shale are found to be closely related to the evolution of the strain field. The evolution of the strain field directly affects the failure behavior of the rock.
Article
Engineering, Mechanical
Daniele Gaetano, Fabrizio Greco, Lorenzo Leonetti, Paolo Lonetti, Arturo Pascuzzo, Camilla Ronchei
Summary: This work presents a novel finite element-based detailed micro-model method for nonlinear analysis of masonry structures under in-plane loading conditions. The method reproduces material nonlinearities caused by fracture phenomena at mortar joints using zero-thickness interface elements. The proposed method is validated through comparisons with experimental data.
ENGINEERING FAILURE ANALYSIS
(2022)
Article
Chemistry, Multidisciplinary
Yinge Zhu, Huiyuan Chen, Anqi Li, Yue Wu, Xiaoli Zhang
Summary: The mechanical behaviors of rock masses are significantly affected by the distribution and shape of the holes in it. In this research, the fracture mechanism and the shear properties of rock masses containing holes were investigated using the cohesive zone model (CZM) method. The results show that the shear process can be divided into elastic, strengthening, plastic, and residual stress stages, and the shear rate and normal stress are positively correlated with shear strength and dilatancy. The cracking behavior and mechanical properties of the specimens are closely related to the shear rate and normal stress.
APPLIED SCIENCES-BASEL
(2022)
Article
Engineering, Mechanical
Mahmoud Alneasan, Abdel Kareem Alzo'ubi, Mahmoud Behnia, Omer Mughieda
Summary: The mechanical properties of rocks are greatly influenced by thermal treatment, with different effects observed for brittle and ductile rocks. Thermal treatment can improve crack speed and fracture toughness in ductile rocks, but may have varying effects on brittle rocks depending on temperature.
THEORETICAL AND APPLIED FRACTURE MECHANICS
(2022)
Article
Engineering, Multidisciplinary
Mohsen Goudarzi, Davide Grazioli, Angelo Simone
Summary: This paper presents an efficient computational approach for modeling and simulating electrochemical phenomena in fibrous electrodes during battery charge/discharge processes. By using a dimensionally reduced embedded fiber model, simulations in a three-dimensional setting can be conducted with relatively low computational requirements.
INTERNATIONAL JOURNAL FOR NUMERICAL METHODS IN ENGINEERING
(2022)
Article
Engineering, Multidisciplinary
M. H. C. Bento, S. P. B. Proenca, C. A. Duarte
Summary: The Generalized/eXtended Finite Element Method (G/XFEM) is an approach proposed to solve problems that are challenging for the standard Finite Element Method (FEM). This paper presents a well-conditioned and optimally convergent second-order G/XFEM for Linear Elastic Fracture Mechanics (LEFM) simulations, by augmenting second-order Lagrangian FEM approximation spaces and proposing two strategies to accurately represent second-order discontinuous functions along a crack.
COMPUTER METHODS IN APPLIED MECHANICS AND ENGINEERING
(2022)
Article
Mechanics
Nathan Shauer, C. Armando Duarte
Summary: This article extends a 3-D methodology for the simulation of hydraulic fracture propagation to consider the simultaneous propagation and interaction of multiple fractures. The methodology uses the Generalized Finite Element Method (GFEM) to handle the solid mesh and the fluid flow in the fractures, and adopts the Reynolds lubrication theory for the fluid flow. The GFEM allows for improved accuracy around the fracture front with the use of singular enrichment functions, and the discretization error is controlled by employing mesh adaptivity. The method also models the fluid partitioning among fractures using the wellbore and accounts for pressure losses between wellbore and fractures.
ENGINEERING FRACTURE MECHANICS
(2022)
Article
Engineering, Geological
Faisal M. Mukhtar, Nathan Shauer, C. Armando Duarte
Summary: This paper presents a comprehensive study on multiple hydraulic fracture propagation and their interactions using the three-dimensional generalized/eXtended finite element method (G/XFEM). The simulations capture the complex multiphysics behavior of nonplanar fracture footprints under mixed-mode conditions. The study investigates the influences of various parameters on hydraulic fracture behavior.
INTERNATIONAL JOURNAL FOR NUMERICAL AND ANALYTICAL METHODS IN GEOMECHANICS
(2022)
Article
Mathematics, Interdisciplinary Applications
Dongyu Liu, Sanne J. van den Boom, Angelo Simone, Alejandro M. Aragon
Summary: In this paper, we propose an enriched finite element formulation to address the computational modeling of contact problems and the coupling of non-conforming discretizations in the small deformation setting. The method ensures continuity of the displacement field and accurately transfers tractions at contact interfaces.
COMPUTATIONAL MECHANICS
(2022)
Article
Engineering, Multidisciplinary
H. Li, J. Avecillas-Leon, N. Shauer, C. A. Duarte
Summary: This paper presents an iterative multiscale Generalized Finite Element Method (GFEM) for coupling 3-D solid and shell models and capturing interactions among structural scales. The performance of the methodology is compared against fully 3-D models and the sub-modeling approach, and it shows promising results.
COMPUTER METHODS IN APPLIED MECHANICS AND ENGINEERING
(2022)
Article
Chemistry, Physical
Alessio Fragasso, Hendrik W. de Vries, John Andersson, Eli O. van der Sluis, Erik van der Giessen, Patrick R. Onck, Cees Dekker
Summary: Nuclear pore complexes (NPCs) regulate molecular transport in eukaryotic cells, and a selective barrier is formed by intrinsically disordered Phe-Gly nucleoporins (FG-Nups). By combining experiments and mathematical modeling, researchers found that Kap95 exhibits two populations when interacting with Nsp1: one population is transported across the pore rapidly, while the other population becomes stably assembled within the FG mesh of the pore.
Article
Mechanics
Faisal M. Mukhtar, C. Armando Duarte
Summary: This paper presents the application of a coupled multiphysics 3-D generalized finite element method (GFEM) for the simulation of hydraulic fracture experiments. The algorithm is able to accurately compute the propagation paths and stress intensity factors of fractures using an automatic time step search and a regularized Irwin criterion. The method is validated against experimental data and shows good accuracy in simulating hydraulic fractures in different materials.
ENGINEERING FRACTURE MECHANICS
(2022)
Article
Engineering, Multidisciplinary
Murilo H. C. Bento, Sergio P. B. Proenca, C. Armando Duarte
Summary: This article proposes a computationally efficient and easy-to-implement posterior error estimator for second-order G/XFEM and FEM approximations. The estimator is based on the block-diagonal Zienkiewicz-Zhu (ZZ-BD) estimator and is applicable to linear elastic fracture mechanics problems and other types of problems involving material interfaces. The proposed ZZ-BD estimator recovers stress fields from the approximations using locally weighted L-2 projections and enrichments provided by the gradient of G/XFEM enrichments. Numerical experiments demonstrate the convergence and effectiveness of the estimator for mesh adaptivity algorithms.
INTERNATIONAL JOURNAL FOR NUMERICAL METHODS IN ENGINEERING
(2023)
Article
Multidisciplinary Sciences
Maurice Dekker, Erik Van der Giessen, Patrick R. Onck
Summary: The intrinsically disordered FG-Nups in the central channel of the nuclear pore complex (NPC) form a selective permeability barrier and undergo phase separation, with GLFG-Nups acting as hydrophobic stickers essential for the formation of FG-Nup condensates. The different FG-Nups can be divided into two classes based on their observed phase separation behavior: the central FG-Nups form a dynamic percolated network, while the peripheral FG-Nups likely form an entropic brush.
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2023)
Article
Engineering, Mechanical
J. Garzon, C. S. Ramos, M. H. C. Bento, S. P. B. Proenca, C. A. Duarte
Summary: This paper presents a methodology for efficient analysis of 3-D fracture mechanics problems in linear viscoelastic media. The method combines the Elastic-Viscoelastic Correspondence Principle (EVCP), a Generalized Finite Element Method (GFEM), and an inverse Laplace transform (ILT) to compute Energy Release Rate (ERR) and Crack Mouth Opening Displacement (CMOD) for viscoelastic fracture problems in the time domain. The proposed method, EVCP-GFEM-ILT, requires only a single elastic solution regardless of the time interval of the target viscoelastic problem. Verification against analytical and reference numerical solutions is performed, and the computational cost is compared with a commercial software. The applicability of the proposed methodology is demonstrated through solving a fully 3-D mixed-mode fracture problem with a non-trivial viscoelastic material model, as well as a large-scale practical simulation problem.
THEORETICAL AND APPLIED FRACTURE MECHANICS
(2023)
Article
Chemistry, Physical
Saber Shakibi, Patrick R. R. Onck, Erik van der Giessen
Summary: Glycosaminoglycans (GAGs) are polysaccharides that play crucial roles in biological processes. They are important structural components of cartilage and the extracellular matrix of the brain. Coarse-grained modeling is essential due to the large size of GAGs.
JOURNAL OF CHEMICAL THEORY AND COMPUTATION
(2023)
Meeting Abstract
Biophysics
Saber Shakibi, Patrick R. Onck, Erik Van der Giessen
BIOPHYSICAL JOURNAL
(2023)
Article
Chemistry, Multidisciplinary
Davide Grazioli, Alberto C. C. Dadduzio, Martina Roso, Angelo Simone
Summary: A computational strategy was developed to evaluate the electrical homogeneity of nanowire electrodes. The strategy involves modeling the electrodes as two-dimensional networks and computing the electrical power in each square of the network. The evaluation indicated that a high degree of homogeneity can be achieved even with a small difference in resistance between nanowires and junctions.
Article
Multidisciplinary Sciences
Hamidreza Jafarinia, Erik Van der Giessen, Patrick R. Onck
Summary: Poly-PR can bind with multiple importins and exportins, interfering with various important steps involved in nucleocytoplasmic transport, including cargo binding, release, and protein transport.
SCIENTIFIC REPORTS
(2022)
