Article
Engineering, Multidisciplinary
Tongming Qu, Yuntian Feng, Min Wang
Summary: This work develops an adaptive RVE model combined with an EPB algorithm for hierarchical multiscale analysis of granular materials undergoing large deformation, addressing the issue of loss of representativeness in current RVE models.
INTERNATIONAL JOURNAL FOR NUMERICAL METHODS IN ENGINEERING
(2021)
Article
Materials Science, Multidisciplinary
R. Hari Sankar, Harpreet Singh
Summary: Acknowledging the demand for composites in the engineering industry, this paper focuses on microscale failure of composites and the use of multiscale modelling techniques for improvement. The study proposes a technique to mitigate mesh sensitivity in representative volume element (RVE) modelling and formulates modified periodic boundary conditions (MPBCs) to attenuate size dependency. The ability of MPBCs to reduce the effect of RVE size on material response is verified through analysis of 1200 RVE samples.
MECHANICS OF MATERIALS
(2023)
Article
Engineering, Multidisciplinary
Jiabao Li, Qing Wang, Xinfei Li, Lei Ju, Yiheng Zhang
Summary: In this paper, a homogenization method based on peridynamics is proposed, which overcomes the limitation of Poisson's ratio and can be applied to periodic materials with defects.
ENGINEERING ANALYSIS WITH BOUNDARY ELEMENTS
(2022)
Article
Engineering, Multidisciplinary
Anonis Reinaldo A, Mroginski Javier L, Sanchez Pablo J.
Summary: A multiscale model for saturated porous media is proposed based on the concept of representative volume element (RVE) and virtual power measures. The weak form of micro-scale balance equations and homogenization rules for macro-scale stress-like variables and body forces are derived. A simple constitutive-like assumption is used to eliminate the micro-scale size dependence and restore the RVE notion while retaining the effects of the dynamical component of the homogenized flux velocity.
INTERNATIONAL JOURNAL FOR NUMERICAL METHODS IN ENGINEERING
(2023)
Article
Construction & Building Technology
P. S. M. Thilakarathna, P. Mendis, H. Lee, E. R. K. Chandrathilaka, V. Vimonsatit, K. S. Kristombu Baduge
Summary: In this paper, a multiscale modelling method is proposed to predict the macroscopic elastic modulus of Ultra-High Strength Concrete (UHSC). By using techniques such as nanoindentation experiments, hydration simulations, scanning electron microscopy, and finite element modelling, the macroscopic and microstructural characteristics of UHSC are investigated. The analysis of material response at different scales provides a better understanding of the contribution to the macroscopic behavior of UHSC.
CONSTRUCTION AND BUILDING MATERIALS
(2022)
Article
Engineering, Multidisciplinary
Pieter Hofman, Lu Ke, Frans P. van der Meer
Summary: A common choice for multiscale modeling of composite materials is to use periodic boundary conditions on square and cubical representative volume elements (RVEs). However, existing methods fail to reproduce the transverse isotropy of composites with strain localization, and rotating or shifting the periodicity constraints introduces mismatching microstructure. This study proposes a new formulation of periodic boundary conditions on circular RVEs, which allows for a single fully developed localization band under arbitrary angle. The results show that the circular RVE with the new formulation successfully predicts a transversely isotropic response without mismatching microstructure and the length scale parameter is well-defined and independent of the RVE's orientation.
INTERNATIONAL JOURNAL FOR NUMERICAL METHODS IN ENGINEERING
(2023)
Article
Mechanics
AliAkbar Allahdadian, Mohammad Mashayekhi
Summary: This paper presents a multiscale approach for predicting the strength and tensile modulus of carbon nanotube reinforced glass-epoxy composite. The approach involves modeling the behavior of the composite at the micro-scale and mesoscale. Experimental and numerical investigations were conducted to study the effect of different percentages of carbon nanotubes on the tensile behavior of the composite. The results show significant improvements in the tensile modulus and strength of the composite with the addition of carbon nanotubes.
COMPOSITE STRUCTURES
(2023)
Article
Mechanics
D. Kempesis, L. Iannucci, S. Del Rosso, P. T. Curtis, D. Pope, P. W. Duke
Summary: This paper focuses on the development of a novel research method for studying the micromechanical response of Ultra-high-Molecular-Weight Polyethylene (UHMWPE) composites, through the establishment of a three-dimensional constitutive model and Representative Volume Element (RVE).
COMPOSITE STRUCTURES
(2021)
Article
Materials Science, Multidisciplinary
Kazuki Shibanuma, Taiga Fukada, Hideo Yasumoto, Kenji Tokuda, Byung-Nam Kim, Kamran Nikbin
Summary: In order to evaluate creep in materials under actual-use conditions, it is necessary to consider the polycrystalline morphology. A model has been proposed in this study to quantitatively predict the influence of 3D poly-crystalline morphology on Coble creep deformation. The model was validated and found to accurately reproduce the influences of grain size, applied stress, and temperature. Additionally, it provided quantitative predictions of materials performance under any loading or temperature condition.
MATERIALS & DESIGN
(2023)
Article
Mechanics
D. Duhamel, J. -M. Mencik
Summary: A finite element procedure is proposed for computing the dynamic response of infinite periodic structures subject to localized time-dependent excitations. The method involves describing absorbing boundary conditions in the frequency domain using impedance matrices and switching them to the time domain through rational functions, resulting in a second-order time differential equation. Numerical experiments demonstrate the relevance of the approach.
EUROPEAN JOURNAL OF MECHANICS A-SOLIDS
(2022)
Article
Physics, Applied
Y. L. Zhan, W. Kaddouri, T. Kanit, Q. Jiang, L. R. Liu, A. Imad
Summary: The custom design of a composite material requires understanding its effective behavior, which is influenced by various parameters. This study extensively investigates the effective thermal conductivity of composites under different parameters using a numerical homogenization technique. The results show that the shape of the reinforcements has a significant effect on the behavior of the composites. Different types of composites also exhibit different behaviors when the reinforcements have a circular or almost circular shape.
INTERNATIONAL JOURNAL OF MODERN PHYSICS B
(2023)
Review
Materials Science, Multidisciplinary
Somnath Ghosh, Dennis Dimiduk, David Furrer
Summary: The mechanical properties of materials and engineered components are influenced by the material structure at different scales. As the utilization of materials reaches their maximum capabilities, the tails on property distributions become significant. These tails are often driven by the extremes of microstructural feature distributions, highlighting the importance of statistically relevant microstructure descriptions and their relationship with property measurement capabilities and models.
INTERNATIONAL MATERIALS REVIEWS
(2023)
Article
Materials Science, Multidisciplinary
Chaocan Cai, Bo Wang, Weilong Yin, Zhonghai Xu, Rongguo Wang, Xiaodong He
Summary: This work proposes a novel algorithm based on the bionic optimization technology of Cuckoo search algorithm to generate three-dimensional random spatial distribution representative volume elements (RVEs) of composite materials. The algorithm overcomes the limitations of previous approaches and is capable of generating nonuniformly dispersed microstructures with high fiber volume fractions and specified inter-fiber distances. Statistical analysis is conducted to evaluate the generated RVEs, and the results are validated against experimental data. The algorithm is further validated through finite element method and volume homogenization to predict the elastic properties of the RVEs.
MATERIALS & DESIGN
(2022)
Article
Engineering, Mechanical
Yannan He, Jiacheng Wu, Dacheng Qiu, Zhiqiang Yu
Summary: The mechanical failure behaviors prediction model of rigid polyurethane foam (RPUF) under complex thermal-vibration conditions was constructed through experiments and numerical simulations, showing that thermal-vibration treatment reduces the tensile strength and fracture elongation of RPUF. The model accurately describes the failure progress and mechanism of RPUF, providing insights for designing foam materials with high thermal-vibration aging resistance in the future.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2021)
Article
Engineering, Multidisciplinary
David R. Brandyberry, Xiang Zhang, Philippe H. Geubelle
Summary: This paper proposes a two-step optimization method for the design of multiscale heterogeneous materials with nonlinear macroscopic response driven by volumetric and interfacial damage at the microstructural level. The method includes a reduced-order design phase using Eigendeformation-based reduced-order Homogenization Method (EHM) and a high-fidelity optimization phase using Interface-Enriched Generalized Finite Element Method (IGFEM).
COMPUTER METHODS IN APPLIED MECHANICS AND ENGINEERING
(2022)
Article
Engineering, Multidisciplinary
Satyaki Bhattacharjee, Karel Matous
COMPUTER METHODS IN APPLIED MECHANICS AND ENGINEERING
(2020)
Article
Computer Science, Interdisciplinary Applications
Dewen Yushu, Karel Matou
JOURNAL OF COMPUTATIONAL PHYSICS
(2020)
Article
Biotechnology & Applied Microbiology
Mengfei Li, Karel Matous, Robert Nerenberg
BIOTECHNOLOGY AND BIOENGINEERING
(2020)
Article
Engineering, Mechanical
Ifeanyi Emmanuel Kalu, Helen Mary Inglis, Schalk Kok
Summary: The study showed that the sensitivity of localized erosion flaws in tubes to shape parameters depends on whether linear elastic or nonlinear elastic-plastic analysis is used. Regardless of the specific shape parameterization chosen, as long as the minimum remaining wall thickness is matched, the failure of tubes is insensitive to the specific shape.
ENGINEERING FAILURE ANALYSIS
(2021)
Article
Engineering, Multidisciplinary
Ifeanyi Emmanuel Kalu, Helen Mary Inglis, Schalk Kok
INTERNATIONAL JOURNAL OF PRESSURE VESSELS AND PIPING
(2020)
Article
Materials Science, Characterization & Testing
C. J. Qambela, P. S. Heyns, H. M. Inglis
Summary: Full-field digital image correlation (DIC) is introduced as a method for detecting damage in laminated composites under static loading conditions. This optical measuring system is capable of assessing deformation data and detecting changes in stiffness caused by barely visible impact damage. Experimental findings demonstrate the capability of full-field DIC to detect damage caused by various impact energies in laminated composites.
JOURNAL OF NONDESTRUCTIVE EVALUATION
(2021)
Article
Materials Science, Multidisciplinary
Sangmin Lee, Katherine Ramos, Karel Matous
Summary: This study investigates the influence of microstructure on the transient mechanical behavior of materials through large three-dimensional damage simulations, developing a novel damage model to address complex morphologies and scales. High-performance parallel simulations using a finite element solver show that high strain rates and microstructural details play crucial roles in complex damage patterns and overall material response.
MECHANICS OF MATERIALS
(2021)
Article
Engineering, Industrial
Willem Wannenburg, Helen M. Inglis, Johann Wannenburg, Chris Roth
Summary: This paper aims to develop a model for accurately predicting the remaining useful life of critical reinforced concrete beams due to fatigue, in order to guide repair or replacement decisions. By using Monte Carlo simulation to provide confidence levels of RUL outputs, the model's application in practice is demonstrated, leading to conclusions regarding damage tolerant design.
JOURNAL OF QUALITY IN MAINTENANCE ENGINEERING
(2022)
Article
Biotechnology & Applied Microbiology
Mengfei Li, Karel Matous, Robert Nerenberg
Summary: Biofilms are typically heterogeneous in morphology, structure, and composition, resulting in nonuniform mechanical properties. This study used an image-based modeling approach to map the non-Newtonian viscosity of biofilms at a pixel-scale, showing that a heterogeneous model predicts deformations more accurately than a homogeneous one. The spatial distribution of non-Newtonian viscosity plays a crucial role in determining the stress distribution in biofilms.
BIOTECHNOLOGY AND BIOENGINEERING
(2022)
Article
Biotechnology & Applied Microbiology
Mengfei Li, Yanina Nahum, Karel Matous, Paul Stoodley, Robert Nerenberg
Summary: This study investigates the effects of biofilm mechanical heterogeneity on the results obtained by rheometry. Both experiments and simulations show that the biofilm properties determined by rheometry are strongly influenced by the weakest portion of the biofilm. The findings suggest caution should be exercised when interpreting rheometry data, particularly when the mechanical properties are stratified.
BIOTECHNOLOGY AND BIOENGINEERING
(2023)
Article
Engineering, Mechanical
Ifeanyi Emmanuel Kalu, Helen Mary Inglis, Schalk Kok
Summary: A prevalent failure mechanism in boiler tubes operating in harsh environmental conditions is localized erosion, leading to substantial reduction of tube thickness and ultimately rupturing. Prioritizing repairs for critical flaws that cannot survive till the next scheduled shutdown is recommended. Nonlinear structural analysis and various failure assessment techniques were used to determine the projected time to failure for each tube and rank them based on repair priority.
JOURNAL OF PRESSURE VESSEL TECHNOLOGY-TRANSACTIONS OF THE ASME
(2023)
Article
Computer Science, Interdisciplinary Applications
Cale Harnish, Luke Dalessandro, Karel Matous, Daniel Livescu
Summary: In order to solve multiscale and multiphysics problems correctly and predictively, a wavelet-based technique is developed to solve a coupled system of nonlinear partial differential equations (PDEs) while resolving features on a wide range of spatial and temporal scales. The method utilizes the multiresolution nature of wavelet basis functions and a sparse multiresolution spatial discretization to solve initial-boundary value problems on finite domains. By dynamically adapting the computational grid using wavelet theory and embedding a predictor-corrector procedure within the time advancement loop, the method maintains accuracy of the solutions of the PDEs as they evolve and provides high fidelity simulations with significant data compression. The capabilities of the algorithm are demonstrated by modeling high-strain rate damage nucleation and propagation in nonlinear solids using a novel Eulerian-Lagrangian continuum framework.
JOURNAL OF COMPUTATIONAL PHYSICS
(2023)
Article
Engineering, Multidisciplinary
C. Harnish, L. Dalessandro, K. Matous, D. Livescu
Summary: This study introduces a multiresolution wavelet algorithm for solving partial differential equations with evolving features on a wide range of spatial and temporal scales. By projecting onto wavelet basis functions in space, error estimates are provided to construct a sparse multiresolution discretization ensuring accuracy. This approach includes a predictor-corrector procedure for dynamic grid adaptation and maintaining solution accuracy as the PDE evolves, as shown in examples presented.
INTERNATIONAL JOURNAL FOR MULTISCALE COMPUTATIONAL ENGINEERING
(2021)
Article
Education & Educational Research
Zach Simpson, Helen Inglis, Carl Sandrock
AFRICA EDUCATION REVIEW
(2020)
Proceedings Paper
Engineering, Mechanical
I. E. Kalu, H. M. Inglis, S. Kok
PROCEEDINGS OF THE ASME PRESSURE VESSELS AND PIPING CONFERENCE, 2018, VOL 3B
(2019)
Article
Materials Science, Multidisciplinary
Nizar Lefi, Salem Neily, Roland Bonnet
Summary: This paper investigates the elastic field in a bi-material crystal with an angular dislocation line with one branch placed in the crystal and the other along a strongly bound or welded interface. The analysis formulates the elastic field of a closed dislocation loop and solves it using the knowledge of the Green's tensor of the bi-material. The study provides a faster calculation method and has important implications for solving interfacial angular dislocation problems.
PHILOSOPHICAL MAGAZINE
(2024)
