Article
Construction & Building Technology
Xiangxiang Chen, Xudong Chen, Andrew Chan, Yingyao Cheng, Hongfan Wang
Summary: In this study, the combined finite-discrete element method was used to investigate the impact failures of monolithic glass, focusing on soda-lime glass. The method accurately evaluated the contact forces and structural deformation by discretizing the glass and incorporating a finite element formulation. The results revealed the impact fracture mechanism of soda-lime glass and provided guidance for its design and manufacturing.
Article
Mechanics
Penghai Deng, Quansheng Liu, Haifeng Lu
Summary: The paper proposes a new method for simulating the fracture process of rock materials using the combined finite-discrete element method (FDEM) and introduces a calibration method for three joint element parameters. The accurate values of these parameters can be obtained through experiments and simulations to achieve more accurate simulation results.
ENGINEERING FRACTURE MECHANICS
(2022)
Article
Engineering, Multidisciplinary
Juan Michael Sargado, Eirik Keilegavlen, Inga Berre, Jan Martin Nordbotten
Summary: Numerical simulations of brittle fracture using phase-field methods often face challenges in accurately modeling fully developed cracks due to the limitations of using low order elements for the phase-field. By combining a standard linear finite element discretization with a finite volume approximation of the phase-field evolution equation on the same mesh, looser mesh refinement restrictions can be achieved, resulting in significant reductions in computational costs.
COMPUTER METHODS IN APPLIED MECHANICS AND ENGINEERING
(2021)
Article
Engineering, Multidisciplinary
Min Wang, Ke Gao, Y. T. Feng
Summary: This study developed a continuum-based combined finite-discrete element method (FDEM) with fracture algorithms to investigate complex fracturing processes. By comparing different fracture algorithms, it was found that the intra-element fracture algorithm is more efficient and accurate in simulating fracturing processes.
COMPUTER METHODS IN APPLIED MECHANICS AND ENGINEERING
(2021)
Article
Mechanics
Penghai Deng, Quansheng Liu, Xing Huang, Yin Bo, Qi Liu, Weiwei Li
Summary: The study introduces a new constitutive model based on stress-strain relationship to eliminate the dependence of parameter values on element size. Sensitivities of type II and type I fracture energies, GII and GI, are investigated through uniaxial compression and direct tension simulations, along with the influence of different parameters on the selection of GII and GI values.
ENGINEERING FRACTURE MECHANICS
(2021)
Article
Chemistry, Physical
Marcin Kozlowski, Kinga Zemla, Magda Kosmal, Oleksij Kopylow
Summary: The article investigates the behavior of 185 toughened glass samples of different thicknesses under impact and proposes a load duration factor for toughened glass based on numerical simulations. The study aims to determine the critical drop height causing glass fracture, and also showcases the practical value of the modeling methodology and results through a case study.
Article
Mechanics
Mingyang Wu, Changbao Jiang, Rui Song, Jianjun Liu, Minghui Li, Bo Liu, Di Shi, Zhengwen Zhu, Bozhi Deng
Summary: Conventional discrete fracture network (DFN) modeling is used to simulate hydraulic fracture propagation in fractured low permeability reservoirs. However, natural fractures and heterogeneity in reservoir rocks can significantly impact the simulation results. Therefore, new-generation algorithms for different DFNs are proposed to account for these factors. The study shows that the conventional DFN models may underestimate certain characteristics, such as bending propagation and fracturing time, and overestimate the proportion of tensile failure. Considering the roughness of natural fractures and the nonuniform distribution of mechanical parameters is crucial for accurately predicting hydraulic fracture propagation.
ENGINEERING FRACTURE MECHANICS
(2023)
Article
Engineering, Geological
Weibing Cai, Ke Gao, Shan Wu, Wei Long
Summary: Acoustic emission (AE), a phenomenon of elastic waves released by localized fracture generation, has been widely used to monitor rock failure processes. In this study, a new AE simulation technique based on moment tensor theory is developed within the framework of the combined finite-discrete element method (FDEM). The technique integrates forces around the AE source to obtain the moment tensor and estimates the AE magnitude associated with the acquired moment tensor. The technique can also distinguish fracture types based on moment tensor decomposition approaches. The effectiveness of the approach is verified through various tests and applications.
ROCK MECHANICS AND ROCK ENGINEERING
(2023)
Article
Materials Science, Ceramics
M. K. Khan, M. A. Iqbal
Summary: This study investigated the failure and energy dissipation of monolithic alumina ceramic targets through experiments and numerical simulations, exploring the impact of target thickness on failure mechanisms and developing a model for residual velocity.
CERAMICS INTERNATIONAL
(2022)
Article
Acoustics
Huaming An, Yushan Song, Hongyuan Liu, Haoyu Han
Summary: The proposed FDEM method models the dynamic fracture and fragmentation during mining production by blast in underground mines, effectively capturing stress propagation and fracture processes. It is a valuable numerical approach for studying dynamic rock fracture processes.
SHOCK AND VIBRATION
(2021)
Article
Engineering, Mechanical
Daniel A. Drake, Rani W. Sullivan, Stephen Clay
Summary: This study investigates the use of through-the-thickness stitching to enhance interfacial strength in sandwich composites. Through single cantilevered beam tests and 3D finite element analysis, unique fracture morphologies and crack curvature near stitching were observed, with good agreement between predicted and experimental measurements.
JOURNAL OF SANDWICH STRUCTURES & MATERIALS
(2022)
Article
Mechanics
Mingyang Wu, Ke Gao, Jianjun Liu, Zhenlong Song, Xiaolin Huang
Summary: This study investigates the influence of rock heterogeneity on hydraulic fracture propagation using the combined finite-discrete element method and cohesive zone model. The results show that the distribution type of rock elastic modulus has a significant impact on hydraulic fracture propagation in both the toughness-dominated regime and viscosity-dominated regime.
INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES
(2022)
Article
Engineering, Multidisciplinary
Amir Latifaghili, Milad Bybordiani, Recep Emre Erkmen, Daniel Dias-da-Costa
Summary: The generalized finite element method has shown efficiency in handling crack propagation and internal boundaries. A novel approach based on enrichment Laplace shape functions effectively eliminates sources of oscillations, with excellent agreement with experimental/numerical data in structural examples with highly stiff cracks.
INTERNATIONAL JOURNAL FOR NUMERICAL METHODS IN ENGINEERING
(2022)
Article
Engineering, Manufacturing
Jianzhuang Xiao, Haoran Liu, Tao Ding
Summary: This study explores the effects of interfacial bond properties on the anisotropic mechanical behavior of 3D printed concrete. The findings show that horizontal shear deformation leads to strength reduction under compression, while tensile strength determines flexural strength. Additionally, compressive strength is relatively lower but flexural strength is higher in specimens loaded in Y and Z directions.
ADDITIVE MANUFACTURING
(2021)
Article
Mechanics
Xudong Chen, Xiangxiang Chen, Andrew H. C. Chan, Yingyao Cheng
Summary: This study investigates the impact fracture of laminated glass using the combined finite-discrete element method (FDEM). Various parameters and their influences on the deformation of laminated glass are studied. The results show that strengthening the outer glass can significantly reduce the deformation of laminated glass, and an optimum interlayer thickness is found. It is also observed that projectiles with a larger contact surface cause more serious damage to laminated glass, and soft impact transfers more kinetic energy to the glass than hard impact.
COMPOSITE STRUCTURES
(2022)
Article
Mathematics, Interdisciplinary Applications
S. Boyce, Z. Lei, B. Euser, E. E. Knight, E. Rougier, J. C. Stormont, M. M. Reda Taha
COMPUTATIONAL PARTICLE MECHANICS
(2020)
Article
Materials Science, Multidisciplinary
S. Boyce, E. Rougier, E. E. Knight, M. M. Reda Taha, J. C. Stormont
Summary: This study experimentally investigated coupled hydro-mechanical relationships using flattened Brazilian disks on concrete samples, measuring damage through acoustic emission data and correlating it to pre-peak changes in permeability under different confining stresses. The research validated a novel experimental approach towards investigating hydro-mechanical relationships, which is of interest in various fields such as carbon sequestration, hydrofracking, geothermal energy production, induced seismicity, and underground nuclear waste storage.
INTERNATIONAL JOURNAL OF DAMAGE MECHANICS
(2021)
Article
Chemistry, Multidisciplinary
Wendy K. Caldwell, Bryan Euser, Catherine S. Plesko, Carene Larmat, Zhou Lei, Earl E. Knight, Esteban Rougier, Abigail Hunter
Summary: Large scale computational models are crucial for studying impact cratering events in the solar system, and this study benchmarks two approaches for impact cratering applications. The research discusses results for different impact velocities and directions, and compares them to previously published data. Ultimately, both methods successfully model various impact scenarios.
APPLIED SCIENCES-BASEL
(2021)
Article
Chemistry, Multidisciplinary
Tyler Hagengruber, Mahmoud Reda Taha, Esteban Rougier, Earl E. Knight, John C. Stormont
Summary: The strength of rocks in the confined tension region is significantly influenced by the intermediate principal stress, with increasing stress leading to higher strength. Additionally, as the confining pressure increases, there is a transition from tension-dominated failure to shear processes dominating failure.
APPLIED SCIENCES-BASEL
(2021)
Article
Chemistry, Multidisciplinary
Humberto C. Godinez, Esteban Rougier
Summary: Simulation of fracture initiation, propagation, and arrest is a problem of interest in the scientific community, with combined finite-discrete element method (FDEM) being widely accepted for fracture modeling. In this work, a data assimilation method was implemented to estimate key model parameter values and improve calibration processes for FDEM fracture simulations. Calibration experiments showed a steady convergence of assimilated parameter values towards observed time/stress curves, with tensile and shear strengths converging faster than other parameters.
APPLIED SCIENCES-BASEL
(2021)
Article
Geosciences, Multidisciplinary
Wenfeng Li, Luke P. Frash, J. William Carey, Nathan J. Welch, Meng Meng, Hoang Nguyen, Hari S. Viswanathan, Esteban Rougier, Zhou Lei, Saeed Rahimi-Aghdam, Zdenek P. Bazant
Summary: This study experimentally determined the effects of injection rate and fluid viscosity on fracture branching, showing that these parameters can control the transition of fractures from planar to branched, thereby improving gas production efficiency.
GEOPHYSICAL RESEARCH LETTERS
(2021)
Article
Engineering, Geological
T. Hagengruber, M. M. Reda Taha, E. Rougier, E. E. Knight, J. C. Stormont
Summary: Permeability measurements were conducted on sandstone samples during confined Brazilian strength tests, revealing a significant increase in permeability before reaching peak load, with the increase inversely proportional to the intermediate principal stress.
ROCK MECHANICS AND ROCK ENGINEERING
(2022)
Editorial Material
Chemistry, Multidisciplinary
Esteban Rougier, Abigail Hunter
APPLIED SCIENCES-BASEL
(2021)
Article
Multidisciplinary Sciences
Jorge Jara, Lucile Bruhat, Marion Y. Thomas, Solene L. Antoine, Kurama Okubo, Esteban Rougier, Ares J. Rosakis, Charles G. Sammis, Yann Klinger, Romain Jolivet, Harsha S. Bhat
Summary: This study provides theoretical and numerical insights to identify the precise location of the transition from subshear to supershear speed in natural earthquakes. Through fracture mechanics arguments and multiple numerical models, the researchers identified a decrease in the width of the coseismic off-fault damage zone as the signature of this transition. By cross-validating this signature with high-resolution observations, they confirmed and refined the location of this transition for natural supershear earthquakes.
PROCEEDINGS OF THE ROYAL SOCIETY A-MATHEMATICAL PHYSICAL AND ENGINEERING SCIENCES
(2021)
Article
Construction & Building Technology
Angel Padilla, Moneeb Genedy, Earl E. Knight, Esteban Rougier, John Stormont, Mahmoud M. Reda Taha
Summary: This paper presents a novel experimental technique for the Brazilian tension test, which enables monitoring of postpeak cracking behavior by using additional spring supports to gradually unload the specimen. The proposed test does not affect the concrete behavior precracking or postcracking but slows down postpeak crack propagation, allowing for the monitoring of postpeak concrete behavior in tension.
JOURNAL OF MATERIALS IN CIVIL ENGINEERING
(2022)
Article
Construction & Building Technology
Angel Padilla, Mohammed Amin Najvani, Earl Knight, Esteban Rougier, John Stormont, Mahmoud M. Reda Taha
Summary: This article investigates the relationship between stress, damage, crack propagation, and air permeability evolution in concrete using the Brazilian tension test. The results show that the air permeability increases by six orders of magnitude as the concrete cracks, and the changes in air permeability are directly correlated with changes in damage and fracture in concrete.
CONSTRUCTION AND BUILDING MATERIALS
(2022)
Article
Multidisciplinary Sciences
L. Posiolova, P. Lognonne, W. B. Banerdt, J. Clinton, G. S. Collins, T. Kawamura, S. Ceylan, I. J. Daubar, B. Fernando, M. Froment, D. Giardini, M. C. Malin, K. Miljkovic, S. C. Staehler, Z. Xu, M. E. Banks, E. Beucler, B. A. Cantor, C. Charalambous, N. Dahmen, P. Davis, M. Drilleau, C. M. Dundas, C. Duran, F. Euchner, R. F. Garcia, M. Golombek, A. Horleston, C. Keegan, A. Khan, D. Kim, C. Larmat, R. Lorenz, L. Margerin, S. Menina, M. Panning, C. Pardo, C. Perrin, W. T. Pike, M. Plasman, A. Rajsic, L. Rolland, E. Rougier, G. Speth, A. Spiga, A. Stott, D. Susko, N. A. Teanby, A. Valeh, A. Werynski, N. Wojcicka, G. Zenhaeusern
Article
Chemistry, Applied
Tyler Hagengruber, Kane C. Bennett, Samuel H. Boyce, Esteban Rougier, John D. Yeager
Summary: This paper presents numerical experiments on the high explosive PBX 9502 to investigate the impact of recently observed grain-scale damage mechanisms on uniaxial compression measurements. The simulations directly resolve grains, pores, cracks, and grain-interfaces based on SEM images of damaged and undamaged samples. The results show that the observed microscale damage mechanisms can well explain the degradation of strength and stiffness observed in the laboratory measurements.
PROPELLANTS EXPLOSIVES PYROTECHNICS
(2023)
Article
Physics, Fluids & Plasmas
T. J. Ulrich, Zhou Lei, Marcel C. Remillieux, Esteban Rougier, Harvey E. Goodman, Katelyn A. Huffman, Peter Connolly
Summary: This letter presents evidence for a mechanism underlying the nonclassical nonlinear dynamics observed in cemented granular materials. Numerical simulations show the formation of force chains within the grain-pore network when subjected to dynamic loading. The interface properties between grains and the localized increase of stress at grain-grain contacts lead to reversible decrease in macroscopic elastic properties and peculiar effects on elastic wave propagation.