Article
Materials Science, Multidisciplinary
M. Sasso, F. Sarasini, E. Mancini, A. Lattanzi, J. Tirillo, C. Sergi
Summary: This article aims to characterize the mechanical behavior of PVC foams and develop a complete constitutive model for impact and energy absorption applications. The compressive tests at different speeds on PVC foam samples with different relative densities are performed, and the uniaxial stress-strain curves are used to calibrate the visco-elastic and visco-plastic constitutive model. The tests show strong compressibility and the material model is implemented in Finite Element simulations to validate the calibration results.
EXPERIMENTAL MECHANICS
(2023)
Article
Mechanics
Roberto Brighenti, Timon Rabczuk, Xiaoying Zhuang
Summary: The paper discusses the application of the phase-field approach in describing damage and failure of highly deformable strain rate-dependent materials. By using a continuous field variable to mimic the physical discontinuity, the behavior of rate-dependent polymers can be simulated in large deformations.
EUROPEAN JOURNAL OF MECHANICS A-SOLIDS
(2021)
Article
Mechanics
Igor A. Rodrigues Lopes, Pedro P. Camanho, Francisco M. Andrade Pires, Albertino Arteiro
Summary: An invariant-based constitutive model for unidirectional composites, including viscous effects in the elastic and plastic regimes at finite strains, is proposed. The model utilizes a multiplicative decomposition of the deformation gradient and an isoclinic configuration to avoid intermediate configuration non-uniqueness. It incorporates visco-elastic behavior through the generalised Maxwell model, with a transversely isotropic yield function and a non-associative plastic potential. Visco-plastic effects are introduced through the Perzyna overstress function. The performance of two algorithms for implicit integration is compared, with the semi-implicit stress update algorithm being faster and the fully implicit stress update algorithm guaranteeing quadratic convergence rate in the Newton-Raphson scheme. The model accurately predicts stress-strain responses for different fiber orientation angles and captures fiber re-orientation due to external loading.
INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES
(2022)
Article
Mechanics
Ling Wu, Cyrielle Anglade, Lucia Cobian, Miguel Monclus, Javier Segurado, Fatma Karayagiz, Ubiratan Freitas, Ludovic Noels
Summary: This study identified the parameters of a finite-strain visco-elastic-visco-plastic model with pressure dependency using experimental data obtained from tension and compression tests at different strain rates. A sequential Bayesian Inference framework with data augmentation was developed to improve the accuracy of parameter calibration. Additionally, a Generative Adversarial Network was introduced to generate synthetic datasets for finite element simulations.
INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES
(2023)
Article
Energy & Fuels
Marian Bulla, Stefan Kolling, Elham Sahraei
Summary: The study focuses on developing a novel material model to investigate the orthotropic-visco-elastic and orthotropic-visco-plastic mechanical behavior of polymeric materials, aiming to enhance the accuracy of finite element analysis for the mechanical behavior of Lithium-ion batteries.
Article
Computer Science, Interdisciplinary Applications
Bernardo P. Ferreira, Francisca Carvalho Alves, Andrade Pires
Summary: In this paper, a new constitutive model is formulated to describe the nonlinear behavior of thermoplastic polymers at finite strains under isothermal conditions. The constitutive equations combine three rheological elements to capture the experimental response and have well-defined parametric behavior. An implicit integration algorithm is derived for efficient implementation, and a two-stage optimization-based calibration procedure is developed to identify the material parameters. The model is validated against literature results and shows excellent agreement for all stages of deformation.
COMPUTERS & STRUCTURES
(2023)
Article
Mathematics, Interdisciplinary Applications
Chun Hean Lee, Paulo Refachinho R. de Campos, Antonio J. Gil, Matteo Giacomini, Javier Bonet
Summary: This paper presents a novel upwind Updated Reference Lagrangian Smoothed Particle Hydrodynamics (SPH) algorithm for large strain thermo-elasticity and thermo-visco-plasticity simulations. Conservation laws expressed in referential description are used to describe the deformation process, treating linear momentum, incremental geometric strains measures, and the system's entropy density as conservation variables. The algorithm ensures stability through entropy-stable upwinding stabilisation. Extensive numerical examples demonstrate the applicability and performance of the algorithm, eliminating spurious modes observed in classical Updated Lagrangian SPH frameworks.
COMPUTATIONAL PARTICLE MECHANICS
(2023)
Article
Materials Science, Multidisciplinary
Raheeg Ragab, Yong Pang, Tao Liu, Nigel Neate, Ming Li, Wei Sun
Summary: This work examines the ratcheting and constraint effects of high-temperature cyclic visco-plasticity behavior under low-cycle fatigue through experimental characterization and physically based damage modeling. Tests were conducted on a martensitic steel (FV566) at 600℃ to investigate the key mechanisms contributing to the cyclic visco-plasticity damage. An improved physically-based viscoplasticity modeling framework was introduced to explore the effects at both macro and subgrain levels.
MECHANICS OF MATERIALS
(2023)
Article
Engineering, Mechanical
Chuanpeng Sun, Prashant K. Purohit
Summary: This paper explains the rheological properties of biological tissues and synthetic gels using a chemo-elastic model. The study reveals that the storage and loss moduli of fibrous gels depend on the loading history and the number of phase transition fronts. The authors emphasize the importance of combining rheological measurements with microstructural analysis.
EXTREME MECHANICS LETTERS
(2022)
Article
Mechanics
Yucheng Zhou, Kefu Huang
Summary: In this paper, the authors consider materials with nonlocal properties as a continuum model composed of micro-elements. They study the deformation and energy of the micro-structure system in detail and provide simplified governing equations. They propose a simplified deformation gradient theory (SDG) with two length-scale parameters, which has physical significance and gives a new explanation of elastic moduli. The SDG is shown to degenerate into other existing theories under certain assumptions. It successfully predicts the relationship between elastic moduli and particle sizes in particle reinforced composites and provides accurate predictions for nonlocal micro-torsion.
Article
Chemistry, Physical
Marzena Mucha, Balbina Wcislo, Jerzy Pamin
Summary: This paper aims to develop a constitutive description and numerically simulate a propagating instability phenomenon called the Portevin-Le Chatelier (PLC) effect observed in metallic materials. The PLC effect is modeled using geometrically non-linear thermo-visco-plasticity with the Estrin-McCormick type hardening function to reproduce serrated responses. The simulations are in good agreement with experimental results and exhibit expected sensitivity to model parameters.
Article
Engineering, Geological
Yaneng Zhou, George Z. Voyiadjis
Summary: The study analyzed the rate-dependent mechanism of frictional contact between a blunt tool and fluid-infiltrated porous rock under pressurized conditions. It was found that the average effective contact stress and pore pressure change with increasing lambda for different rock types, leading to different frictional behaviors. The results suggest that there are distinct pore pressure regimes and interface friction angle effects on the contact behavior.
ROCK MECHANICS AND ROCK ENGINEERING
(2021)
Article
Materials Science, Ceramics
Aubrey L. Fry, Andrew L. Ogrinc, Seong H. Kim, John C. Mauro
Summary: The field strength effect of different network modifiers on the elastoplastic properties of aluminoborosilicate glasses was investigated through a volumetric recovery study. This research, along with Part I, examined the relationship between hardness, crack resistance, and other physical properties with glass elasticity. The results showed that the elastic volume fraction decreased with field strength for both alkali and alkaline earth glasses. The Poisson's ratio did not exhibit a trend with pile-up or shear flow volume fraction. The elastic-to-plastic deformation ratio increased with applied load and decreased with modifier field strength for both alkali and alkaline earth glasses, and an increase in plasticity correlated with increased hardness, crack resistance, and elastic moduli.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2023)
Article
Mechanics
J. Ciambella, M. B. Rubin
Summary: A continuum model is proposed for an elastically isotropic visco-plastic matrix reinforced by a distribution of fibres with large deformation. The evolution equation governs the symmetric positive-definite tensor of fibre distribution, which competes between affine and non-affine evolution to align with elastic deformation or become isotropic. The introduction of two elastic deformation measures associated with fibre distribution results in anisotropic stress response. This model has implications in growth and remodelling of biological tissues and additive manufacturing of artificial materials, explaining the transition from isotropic to anisotropic response.
EUROPEAN JOURNAL OF MECHANICS A-SOLIDS
(2023)
Article
Engineering, Mechanical
Rafael Penas, Etienne Balmes, Arnaud Gaudin
Summary: Rubber modeling is a complex subject with many existing models. This paper proposes a classification method to categorize and study different types of rubber models. Through experiments, the paper illustrates the need to model and combine the base behaviors of hyperelasticity, viscoelasticity, and rate independent hysteresis. Various measurement strategies are discussed to measure and differentiate between different model forms.
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2022)
Article
Mechanics
Phillipe D. Alves, Angelo Simone, C. Armando Duarte
Summary: This paper introduces a methodology for analyzing three-dimensional static fractures in fiber-reinforced materials, which is verified against three-dimensional FEM solutions. The method is able to handle fibers bridging across crack faces at arbitrary angles, and comparisons against experimental data and convergence studies are also presented.
Article
Engineering, Biomedical
Ali Paknahad, Mohsen Goudarzi, Nathan W. Kucko, Sander C. G. Leeuwenburgh, Lambertus J. Sluys
Summary: Calcium phosphate cements (CPCs) have been widely used as biocompatible bone substitutes, but their low fracture toughness and high brittleness limit their clinical applicability. Reinforcing CPC matrix with polymeric fibers can significantly enhance their toughness and strength, making them potential advanced bone substitutes, especially in load-bearing anatomical sites. This study provides integrated experimental and numerical characterization of fiber-reinforced calcium phosphate cements (FRCPCs) under bending and tensile loading, offering a firm basis for further investigations in this field.
ACTA BIOMATERIALIA
(2021)
Article
Engineering, Multidisciplinary
Richard Dekker, Frans P. van der Meer, Johan Maljaars, Lambertus J. Sluys
Summary: The numerical model integrates various techniques such as the level set method, segmentation of solid and pit domains, and atomic diffusion to study the growth of corrosion pits under mechanical and electrochemical loading. The results show that plastic deformation and cyclic frequency have a significant impact on the pit growth rate under different loading conditions, while mechanical loading under diffusion control has little influence on the growth rate.
INTERNATIONAL JOURNAL FOR NUMERICAL METHODS IN ENGINEERING
(2021)
Article
Mechanics
Y. Liu, F. P. van der Meer, L. J. Sluys, L. Ke
Summary: The mode-I dynamic fracture energy and failure mechanisms of glass fiber-reinforced polymer composites were investigated using an embedded cell model of the single-edge-notched-tension (SENT) geometry. It was found that with increasing strain rates, the composite material exhibited increased brittleness, with limited plasticity in the fracture process zone. The crack growth was dominated by a velocity-toughness mechanism after the fracture process zone was fully developed.
ENGINEERING FRACTURE MECHANICS
(2021)
Article
Mechanics
M. Goudarzi, F. Dal Corso, D. Bigoni, A. Simone
Summary: The dispersion of rigid line inclusions in a matrix material can have both beneficial and detrimental effects on material properties, influencing the formation of shear bands during matrix deformation and affecting the dominant failure mechanism.
INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES
(2021)
Article
Construction & Building Technology
Anmol Singla, Branko Savija, Lambertus J. Sluys, C. Romero Rodriguez
Summary: Lattice models have been used to predict the durability of cementitious materials, but there is limited research on the computational aspects of these numerical models. This study uses a discretized lattice model to simulate moisture transport in cement-based materials and evaluates various parameters. The results show that the model accurately predicts capillary absorption and provides guidelines for optimizing the computations.
CONSTRUCTION AND BUILDING MATERIALS
(2022)
Article
Electrochemistry
Mingzhao Zhuo, Davide Grazioli, Angelo Simone
Summary: This paper addresses the limitations of existing battery modeling works by utilizing a nested finite element multiscale framework, demonstrating the importance of a tensorial description of transport properties in modeling battery processes, and verifying the numerical results.
ELECTROCHIMICA ACTA
(2021)
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
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
Mechanics
Yubao Zhou, Lambertus J. Sluys, Rita Esposito
Summary: This study comprehensively investigates various meanfield homogenization schemes for the three-dimensional orthotropic elastic properties of masonry and proposes an improved micro-mechanical model that accurately evaluates the elastic properties of different types of masonry. The proposed model shows better performance when the stiffness ratios are high, which is of major importance for nonlinear analysis of masonry.
EUROPEAN JOURNAL OF MECHANICS A-SOLIDS
(2022)
Article
Mechanics
J. Alfaiate, L. J. Sluys
Summary: Localisation of cracking in quasi-brittle materials is a challenging task, and conventional iterative methods often fail to provide convergence of the numerical solution. On the other hand, traditional total approaches cannot properly approximate the underlying material law. This study introduces the Total Iterative Approach, which updates internal damage variables iteratively, and demonstrates its robustness and ability to accurately approximate the material law in analyzing softening behavior through examples.
ENGINEERING FRACTURE MECHANICS
(2023)
Article
Materials Science, Multidisciplinary
A. Fayezioghani, R. Dekker, L. J. Sluys
Summary: Corrosion simulation of structural components in corrosive environments requires consideration of the electrochemistry of corrosion and the moving interface between solid and electrolyte. This paper evaluates a model that combines finite element method with level-set method. Part I demonstrates the capabilities of this model in simulating pitting corrosion through numerical examples.
MATERIALS TODAY COMMUNICATIONS
(2022)
Article
Materials Science, Multidisciplinary
A. Fayezioghani, R. Dekker, L. J. Sluys
Summary: This study presents a stress corrosion pit growth model that accurately considers electrochemistry, handles the moving interface between solid and electrolyte, and incorporates the synergism between corrosion and mechanical field at the interface. Part II investigates the model's capabilities through numerical examples, including experimental validation and uncertainty quantification of model parameters and properties.
MATERIALS TODAY COMMUNICATIONS
(2022)
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
Physics, Fluids & Plasmas
L. Ponson, Z. Shabir, M. Abdulmajid, E. Van der Giessen, A. Simone
Summary: The study found that in two-dimensional brittle disordered solids, the roughness exponent of brittle cracks is 0.50+/-0.05, different from the reported range of 0.6-0.7 for other materials. The findings were theoretically explained and shed light on the unique behavior of crack paths compared to other materials.
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)
