Article
Mechanics
Soheil Firooz, George Chatzigeorgiou, Paul Steinmann, Ali Javili
Summary: This manuscript incorporates a novel interface model into the Mori-Tanaka method to determine effective properties and average local fields of composites. The significance of interface position on the overall response of heterogeneous materials is highlighted through computational simulations and numerical examples.
INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES
(2022)
Article
Mechanics
Soheil Firooz, George Chatzigeorgiou, Paul Steinmann, Ali Javili
Summary: This paper introduces a new interface model that allows for arbitrary interface positions and highlights the importance of interface position on the overall response of heterogeneous materials. Through analytical solutions and finite element method simulations and comparisons, the effectiveness and applicability of the interface model are validated.
INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES
(2022)
Article
Thermodynamics
Neeraj Kumar Sharma
Summary: This work proposes an approach for thermo-mechanical analysis of particulate composites with different phase distributions of particles. The effects of convection cooling rate on thermal residual stresses in metal matrix composites are investigated. The study compares the predicted elastic modulus with experimental values and different models, and finds that the double inclusion model shows good agreement with FE predictions.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2023)
Article
Mechanics
Stephane Berbenni
Summary: A direct time-incremental homogenization Mori-Tanaka scheme is proposed for two-phase non-linear elasto-viscoplastic materials based on the exact solution of the heterogeneous linear viscoelastic Eshelby ellipsoidal inclusion problem. This approach utilizes the second-order moment of stresses and a modified secant formulation, eliminating the need for Laplace-Carson transforms. The estimates provided by this homogenization model are compared to full-field calculations for two-phase non-linear particulate composites in the literature, under both radial and non-radial loadings.
INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES
(2021)
Article
Mechanics
Khaoula Dorhmi, Katell Derrien, Zehoua Hadjem-Hamouche, Leo Morin, Frederic Bonnet, Jean-Pierre Chevalier
Summary: This study investigates the effective properties of Fe-TiB2 composites obtained after hot or cold rolling, measuring the elastic moduli experimentally and using various methods. Microstructure analyses based on SEM observations are conducted to characterize particle and cracks distribution, and 3D representative microstructures are generated using the RSA method. The overall elastic behavior of the composites is determined numerically through full-field FFT-based simulations, showing a significant improvement in specific stiffness compared to standard steels regardless of processing conditions.
COMPOSITE STRUCTURES
(2021)
Article
Mechanics
Przemyslaw Sadowski, Katarzyna Kowalczyk-Gajewska, Stanislaw Stupkiewicz
Summary: The Mori-Tanaka model combines simplicity and good predictive capabilities, but the use of the Perzyna-type viscoplasticity model may lead to spurious softening in the macroscopic response.
EUROPEAN JOURNAL OF MECHANICS A-SOLIDS
(2021)
Article
Materials Science, Multidisciplinary
George Chatzigeorgiou
Summary: The study demonstrates that multilayered composite structures can be utilized for validating micromechanics techniques and provide the same solution as periodic homogenization methods.
MECHANICS OF MATERIALS
(2022)
Article
Mechanics
Qiang Chen, George Chatzigeorgiou, Fodil Meraghni
Summary: This paper proposes an extended Mori-Tanaka approach to study the piezoelectric response of unidirectional nanoporous composites with energetic surfaces. The simulation includes the consideration of interface using the generalized Gurtin-Murdoch coherent interface model. Analytical solutions for Eshelby's inhomogeneity problems are obtained and the extended multiphysics Mori-Tanaka homogenization scheme is utilized. Comparison with other methods shows the reliability and accuracy of the proposed approach.
COMPOSITE STRUCTURES
(2023)
Article
Polymer Science
Michal Sejnoha, Jan Vorel, Sona Valentova, Blanka Tomkova, Jana Novotna, Guido Marseglia
Summary: This study presents a simple approach to analyze a basalt fabric reinforced composite using a multiscale method. Experimental and computational investigations were conducted to obtain material properties and model parameters. The behavior of the polymer matrix and basalt fibers were studied, and corresponding models were developed to describe the mechanical response of the composite material.
Article
Thermodynamics
Mengyuan Gao, Bo Yang, Yulin Huang, Guannan Wang
Summary: This study investigates the effects of general imperfect interphase/interface models on the thermal conductive responses of fiber reinforced composites. By applying the locally-exact homogenization theory, the influence of different interface parameters on the thermal conductivity of composites is analyzed.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2021)
Article
Physics, Applied
Lu Li, Xinpei Li, Lianhe Li
Summary: This study systematically investigates the effective elastic properties of 1D hexagonal quasicrystal (QC) with spring-type imperfect interfaces. The numerical results show that the presence of imperfect interfaces reduces the effective elastic constants to some extent, indicating the important role played by the interface in the elastic properties of QC composites.
MODERN PHYSICS LETTERS B
(2024)
Article
Mathematics, Interdisciplinary Applications
Paras Kumar, Paul Steinmann, Julia Mergheim
Summary: This study investigates the reinforcement mechanism of nano-composite materials and finds that the approach based on continuously graded interphases is more suitable for modeling such materials with different filler-matrix stiffness combinations.
COMPUTATIONAL MECHANICS
(2021)
Article
Engineering, Chemical
Ce Liang, Changgeng Shuai, Xue Yang, Xin Wang
Summary: A multi-scale model is proposed to investigate the frictional behavior of copper-CNT/polytetrafluoroethylene. The simulation results show that the filling of CNTs can effectively improve the elastic and frictional properties of the PTFE matrix, with the degree of improvement related to the orientation and mass fraction of the CNTs.
Article
Mechanics
Strahinja Milenkovic, Vukasin Slavkovic, Cristiano Fragassa, Nenad Grujovic, Nikola Palic, Fatima Zivic
Summary: This paper presents the fabrication of high-porous composites made of PLA matrix reinforced with PVDF long fibers. The inclusion of PVDF fibers improved ductility while reducing flexural strength. Composite configurations with [-45, +45] raster orientation exhibited higher strength and stiffness in comparison to the [0, 90] orientation.
COMPOSITE STRUCTURES
(2021)
Article
Materials Science, Multidisciplinary
Diwakar Swaroop, Deepjyoti Dhar, Anandavel Suriyan, Atul Jain
Summary: This paper introduces the commonly used mean field homogenization methods and their applications in composite materials, analyzes the issues of multi-step Mori-Tanaka method in terms of physical admissibility and accuracy of predictions, and compares and evaluates multiple implementation schemes.
MECHANICS OF MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Mayssam Naji, Ecem Yelekli Kirici, Ali Javili, E. Yegan Erdem
Summary: The motion of a droplet on a textured ratchet track was studied using a nonlinear resonator model and a double pendulum as a basis for modeling the asymmetric force. By highlighting the similarities between droplet motion and resonators, a method utilizing an inverted double pendulum to simulate droplet motion was proposed. This approach aims to develop an accurate droplet-motion modeling approach and deepen the understanding of droplet dynamics.
Review
Mechanics
S. Firooz, P. Steinmann, A. Javili
Summary: This paper introduces an extended general interface model that allows interfaces to take arbitrary positions between their bulk neighbors, recovering classical interface models. By considering interface position and properties, limits and estimates for the overall moduli of fiber-reinforced and particle-reinforced composites are developed. A comprehensive numerical study highlights the significant influences of interface position, stiffness ratio, and interface parameters on the overall properties of composites.
APPLIED MECHANICS REVIEWS
(2021)
Article
Computer Science, Interdisciplinary Applications
E. Schaller, A. Javili, I Schmidt, A. Papastavrou, P. Steinmann
Summary: In this study, a nonlocal bone remodelling framework was proposed and implemented using a peridynamic formulation on the macroscale. The implementation was validated using a benchmark test and two load cases of the proximal femur.
COMPUTER METHODS IN BIOMECHANICS AND BIOMEDICAL ENGINEERING
(2022)
Article
Thermodynamics
Emely Schaller, Ali Javili, Paul Steinmann
Summary: We propose a thermodynamically consistent formulation for open system peridynamics, which includes a nonlocal mass source to enhance mass balance. The balances of momentum, energy, and entropy are reconsidered due to the influence of the additional mass source. The nonlocal continuum formulation distinguishes between local and nonlocal balance equations.
CONTINUUM MECHANICS AND THERMODYNAMICS
(2022)
Article
Engineering, Multidisciplinary
Marie Laurien, Ali Javili, Paul Steinmann
Summary: This contribution presents a novel approach for treating material interfaces in nonlocal models. The method enforces a kinematic coupling of the two constituents within a nonlocal interface where the material subdomains overlap. The contact is purely geometrical and interaction forces act only between points of the same material. The computational implementation within a variationally consistent peridynamic formulation is described in detail. Various numerical examples demonstrate the utility of the technique for modeling bimaterial interfaces in both two-dimensional and three-dimensional problems, including large deformations.
INTERNATIONAL JOURNAL FOR NUMERICAL METHODS IN ENGINEERING
(2022)
Article
Mechanics
A. Derya Bakiler, Ali Javili
Summary: This paper investigates the instability behavior of trilayer structures under large deformations, developing a theoretical solution that captures different wrinkling modes and the effect of compressibility on the system.
INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES
(2022)
Article
Mechanics
E. Ekiz, P. Steinmann, A. Javili
Summary: Continuum-kinematics-inspired Peridynamics (CPD) is a geometrically exact, thermodynamically and variationally consistent formulation of peridynamics. Unlike the original peridynamics formulation (PD), CPD can capture the Poisson effect exactly and does not suffer from zero-energy modes and displacement oscillations. The two-neighbor interactions in CPD preserve the basic notions of classical continuum kinematics, length and area, and play a key role. This manuscript establishes the relationships between CPD material parameters and isotropic linear elasticity and determines the admissible ranges for CPD material parameters.
INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES
(2022)
Article
Materials Science, Multidisciplinary
A. Derya Bakiler, Ali Javili
Summary: This paper proposes a generic theoretical framework to study the instability behavior of compressible bilayer systems and explores the effects of different parameters. The accuracy of the framework is validated by comparing it with numerical simulation results. It is found that the critical stretch of the system is significantly dependent on the film thickness in the presence of an interface.
MATHEMATICS AND MECHANICS OF SOLIDS
(2023)
Article
Engineering, Mechanical
Berkin Dortdivanlioglu, Ali Javili
Summary: Solid surface tension can cause deformation in soft elastic materials, leading to elastocapillary instabilities similar to Plateau-Rayleigh (PR) instabilities in liquids. The compressibility of the material and the assumed compressible strain energy density play important roles in the onset and post-bifurcation behavior of the elastic P-R instability.
EXTREME MECHANICS LETTERS
(2022)
Article
Mechanics
Qiang Chen, George Chatzigeorgiou, Fodil Meraghni, Ali Javili
Summary: Surface piezoelectricity has been incorporated into the simulation of nanoporous materials using different models and methods, revealing size-dependent multiphysics responses. The accuracy of the computational approaches was verified through the generalized Kirsch problem, showing that homogenized properties predicted by different methods are similar for most parameters and dimensions, except for the transverse shear moduli.
EUROPEAN JOURNAL OF MECHANICS A-SOLIDS
(2022)
Article
Mechanics
Soheil Firooz, George Chatzigeorgiou, Paul Steinmann, Ali Javili
Summary: This manuscript incorporates a novel interface model into the Mori-Tanaka method to determine effective properties and average local fields of composites. The significance of interface position on the overall response of heterogeneous materials is highlighted through computational simulations and numerical examples.
INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES
(2022)
Article
Materials Science, Multidisciplinary
Soheil Firooz, Stefan Kaessmair, Vasily Zaburdaev, Ali Javili, Paul Steinmann
Summary: Cellular aggregates play a significant role in the evolution of biological systems. This study proposes a non-linear continuum mechanics formulation and finite element simulation framework to model the physics of cellular aggregate formation, focusing on bacterial colony formation as an example. The study describes the aggregation process as an active phase separation phenomenon and investigates the influence of various parameters on the dynamics of cellular aggregate formation through numerical examples.
JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS
(2022)
Article
Materials Science, Multidisciplinary
E. Ekiz, P. Steinmann, A. Javili
Summary: This manuscript introduces Continuum-kinematics-inspired Peridynamics (CPD) as a geometrically exact formulation of peridynamics that accurately captures the Poisson effect. CPD for three-dimensional analysis is built upon one, two, and three-neighbor interactions, involving three material constants associated with length, area and volume.
MECHANICS OF MATERIALS
(2022)
Article
Materials Science, Multidisciplinary
Baihong Chen, Changyue Liu, Zengting Xu, Zhijian Wang, Rui Xiao
Summary: In this study, both polydomain and monodomain liquid crystal elastomers (LCEs) were synthesized and their shape change with temperature under a certain stress level was characterized. A thermo-order-mechanical coupling model was developed to predict the shape change of LCEs, showing good consistency with experimental results.
MECHANICS OF MATERIALS
(2024)
Article
Materials Science, Multidisciplinary
Peng Wang, Fei Xu, Yiding Wang, Jun Song, Cheng Chen
Summary: This study investigates the interplay of super-screw dislocations and coherent twin boundary (CTB) in Ni3Al using molecular dynamics simulations and dislocation continuum theory. Various interaction mechanisms are observed depending on the stress and dislocation gliding pathways. A continuum model framework is developed to evaluate the critical shear stress required for CTB to accommodate dislocations along different pathways, considering the effects of anti-phase boundary (APB) and Complex Stacking Fault (CSF). The study suggests that the resistant force of CTB against all gliding dislocations is a more appropriate metric for quantifying its strength.
MECHANICS OF MATERIALS
(2024)
Article
Materials Science, Multidisciplinary
Chenyu Du, Haitao Cui, Hongjian Zhang, Zhibin Cai, Weikuo Zhai
Summary: A thermal-elastoplastic phase field model was developed to simulate thermal fatigue crack growth. The accuracy and availability of the model were verified through typical examples. The results indicate that the proposed model effectively simulates the process of thermal fatigue crack propagation in elastoplastic solids. The appropriate regularization length needs to be determined based on experimental results.
MECHANICS OF MATERIALS
(2024)
Article
Materials Science, Multidisciplinary
J. Carlsson, A. Kuswoyo, A. Shaikeea, N. A. Fleck
Summary: The sensitivity of the compressive strength of a polymeric Kelvin lattice to the presence of an epoxy core is investigated both experimentally and numerically. The study shows that the epoxy core prevents the formation of crush bands in the lattice and changes its deformation mode. At finite strain, the strength of the lattice is degraded by bending failure and cracking of the struts and adjacent core, leading to the formation of vertical fissures.
MECHANICS OF MATERIALS
(2024)
Article
Materials Science, Multidisciplinary
Saptarshi Paul, Anurag Gupta
Summary: In this study, we investigate the geometry and mechanics of the buckled orthotropic von Karman elastic plate with free boundary condition, in the presence of an isolated positive or negative disclination. The shape of the buckled plate is cone-like for a positive disclination and saddle-like for a negative disclination. With increasing orthotropy, the shape of the buckled plate becomes more tent-like and the Gaussian curvature spreads along the ridge of the tent. The stress fields are focused in the neighborhood of the defect point and the ridge, indicating that most of the stretching energy is accommodated in these singular regions.
MECHANICS OF MATERIALS
(2024)
Article
Materials Science, Multidisciplinary
Antu Acharya, Vikram Muthkani, Anirvan DasGupta, Atul Jain
Summary: This study proposes filler-based and infill-based strategies for creating auxetic lattices with enhanced stiffness. The elastic properties of the sinusoidal re-entrant honeycomb lattice are developed and validated using finite element models. Parametric studies are conducted to find combinations leading to enhanced stiffness with minor loss in auxeticity. The results demonstrate the possibility of achieving a significant increment in stiffness while retaining significant auxeticity. The proposed approaches outperform existing approaches in terms of stiffness and auxeticity.
MECHANICS OF MATERIALS
(2024)
Article
Materials Science, Multidisciplinary
Biswajit Pal, Ananth Ramaswamy
Summary: This study presents a multi-scale approach to simulate the shrinkage and creep of concrete, addressing the limitations of existing macroscopic prediction models due to the heterogeneous nature of concrete. The model is validated with experimental data and compared to national codes and macroscopic models, demonstrating its effectiveness in overcoming the gaps in existing models.
MECHANICS OF MATERIALS
(2024)
Article
Materials Science, Multidisciplinary
Akash Kumar Behera, Mohammad Masiur Rahaman, Debasish Roy
Summary: Ceramics have attractive properties but low fracture toughness is a major drawback. There is interest in improving the mechanical performance of ceramics by tailoring residual stresses. However, there is a lack of computational models that can accurately predict crack paths and quantify the improved fracture toughness.
MECHANICS OF MATERIALS
(2024)
Article
Materials Science, Multidisciplinary
Bineet Kumar, Sandeep Kumar Dubey, Sonalisa Ray
Summary: This study aims to develop an energy-based theoretical formulation for predicting the evolution of the fracture process zone in concrete under fatigue loading. Experimental results and calibrations indicate that the specimen size and aggregate size affect the fracture behavior and process zone length of concrete.
MECHANICS OF MATERIALS
(2024)
Article
Materials Science, Multidisciplinary
Zheliang Wang, Hao Sheng, Xinyi Lin, Yifan Rao, Jia Liu, Nanshu Lu
Summary: In this study, an analytical framework is proposed for investigating the behavior of laminated beams with any number of layers under various bending conditions, and the theory is validated through finite element analysis. It was found that the number of layers, applied deformation, layer properties, and layer aspect ratio have an impact on the equivalent flexural rigidity.
MECHANICS OF MATERIALS
(2024)
Article
Materials Science, Multidisciplinary
Michael Schwaighofer, Markus Konigsberger, Luis Zelaya-Lainez, Markus Lukacevic, Sebastian Serna-Loaiza, Michael Harasek, Florian Zikeli, Anton Friedl, Josef Fussl
Summary: In this study, nanoindentation relaxation tests were re-evaluated on five industrial lignins extracted from different feedstocks. It was found that the viscoelastic properties of all tested lignins were practically identical and independent of the feedstock and the extraction processes.
MECHANICS OF MATERIALS
(2024)
Article
Materials Science, Multidisciplinary
Tian Han, Dandan Qi, Jia Ma, Chaoyang Sun
Summary: In this study, a generative design method was used to propose new modified lattice structures suitable for tensile and compressive loading conditions. By conducting experimental and finite element analyses, it was confirmed that the derived structures have improved load-bearing capacity and energy absorption compared to the original structures. The effects of shape parameters on mechanical properties were also discussed.
MECHANICS OF MATERIALS
(2024)
Article
Materials Science, Multidisciplinary
Wenbin Zheng, Jay Airao, Ramin Aghababaei
Summary: Spinodal decomposition of Ti1-xAlxN crystal structure significantly affects their physical properties. This study uses three-dimensional molecular dynamics simulations to investigate the phase transformation mechanism and surface finish during material removal in TiAlN. The simulations reveal that the aluminum content and cutting depth have a significant influence on the phase transformation process through spinodal decomposition.
MECHANICS OF MATERIALS
(2024)
Article
Materials Science, Multidisciplinary
Atasi Ghosh
Summary: The micro-mechanism of low cycle fatigue deformation behavior has been summarized and the recent development in the approach of numerical simulation of cyclic stress-strain behavior of polycrystalline metallic materials at multi-scale has been discussed.
MECHANICS OF MATERIALS
(2024)