Article
Mechanics
L. Sharma, R. H. J. Peerlings, M. G. D. Geers, F. Roters
Summary: The work extends the capability of Fast Fourier transform (FFT) solvers to interface damage modelling, incorporating the cohesive fracture concept using continuum damage mechanics and approximating sharp interfaces as interphases. Anisotropic kinematics are used to model interface crack opening and sliding, with discussions on decohesion model and nonlocal regularization within the interphases. Integral nonlocal approach is utilized to achieve delocalized deformation and scaling of cohesive parameters, with one-dimensional study on overall response and insensitivity of dissipation to interphase thickness, as well as crack propagation modelling in two-dimensional polycrystals.
ENGINEERING FRACTURE MECHANICS
(2021)
Article
Chemistry, Multidisciplinary
Guanjie Lu, Menghong Li, Peng Chen, Weikang Zheng, Zuguang Yang, Ronghua Wang, Chaohe Xu
Summary: A composite lithium anode (CLA) was designed and prepared to solve the obstacles of huge interfacial resistance and growth of detrimental Li dendrites in solid-state lithium metal batteries (SSLMBs). The CLA significantly improved the intrinsic ionic diffusion capability of the lithium anode and simultaneously enhanced the wettability of the anode towards solid-state electrolyte, resulting in a robust and high ionic conductive solid-state interface. The SSLMB with the CLA achieved excellent cycling performance and high-rate capability, demonstrating its potential for high-performance solid-state Li metal batteries.
ENERGY & ENVIRONMENTAL SCIENCE
(2023)
Article
Materials Science, Multidisciplinary
M. Magri, L. Adam, J. Segurado
Summary: In this study, a computational homogenization approach is used to investigate the particle size effect in ductile composites. The micromechanical formulation incorporates a lower-order strain gradient plasticity model and an implicit gradient regularization technique. Numerical simulations and comparative studies with experimental results show that the considered model can quantitatively capture the particle size induced strengthening in metal matrix composites.
JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS
(2022)
Article
Materials Science, Multidisciplinary
Rakesh Kumar Barik, Abhijit Ghosh, Md Basiruddin Sk, Sankalp Biswal, Amlan Dutta, Debalay Chakrabarti
Summary: This paper investigates the microstructure and crystallography of fully pearlitic steel to analyze the process and mechanism of crack propagation, highlighting the influence of lamellae orientation on crack propagation and proposing a mathematical model for crack propagation.
Article
Materials Science, Multidisciplinary
Ke Sun, Zhangquan Peng
Summary: A robust electrode-electrolyte interface is crucial for battery systems, especially in the development of new battery technologies. The introduction of artificial Li-alloying intermetallic interphases has significantly improved the stability and performance of lithium metal batteries and solid-state batteries.
Article
Materials Science, Composites
Bing Wang, Zhangwen Wang, Guodong Fang, Menglei Li, Jiaqi Zhu, Yuan Zhao, Songhe Meng
Summary: The interfacial strength of carbon fiber reinforced epoxy composites is determined inversely by the combination of the transverse fiber bundle tensile experiment and fast Fourier transforms based spectral method. By analyzing the effects of fiber modulus and interfacial geometric features, the interface enhancement mechanisms are revealed, which is helpful for interface design and performance evaluation of new-type carbon fiber reinforced composites.
POLYMER COMPOSITES
(2022)
Article
Engineering, Manufacturing
Li Zhang, Qibo Xia, Cong Zhang, Hong Wu, Guiting Liu, Rong Chen, Shaoyun Guo
Summary: The controlled directional release of multi-layered dosage forms can be achieved using LMCE technology. The release behavior can be flexibly modulated by the choice of uncoated surface and the number of layers. The more layers, the lower the release kinetics parameter.
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
(2022)
Article
Engineering, Manufacturing
Guiting Liu, Cong Zhang, Hangling Song, Rui Pan, Rong Chen, Shaoyun Guo
Summary: The design of multi-layered structures provides a promising strategy for controlled-release dosage forms. In this study, layer-multiplying co-extrusion (LMCE) technology was used to construct poly(epsilon-caprolactone)-poly (epsilon-caprolactone)/polyethylene oxide/metoprolol tartrate (PCL-PCL/PEO/MPT) composites with alternating multi-layered structures. The number of layers could be doubled by adding a layer-multiplying element. The results showed that fewer PCL layers facilitated the dissolution of PEO and increased the pore size in the matrix. The in vitro release results indicated that the MPT was released gradually in a layer-by-layer manner and the release could be modulated by the number of PCL layers and PEO content.
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
(2022)
Article
Chemistry, Physical
Yanke Lin, Tianshuai Wang, Leicheng Zhang, Xudong Peng, Baoling Huang, Maochun Wu, Tianshou Zhao
Summary: This research proposes a method of coating a thin layer containing Al/Li dual-salt onto solid polymer electrolytes to address the issue of dendrite formation and contact loss. By forming a lithiophilic Li-Al alloy-rich layer and a lithiophobic LiF-rich layer, the interfacial adhesion is improved and dendrite suppression is achieved, enabling stable cycling of solid-state Li batteries.
Article
Engineering, Manufacturing
James D. Randall, Filip Stojcevski, Nemanja Djordjevic, Andreas Hendlmeier, Bhagya Dharmasiri, Melissa K. Stanfield, Daniel B. Knorr, Ngon T. Tran, Russell J. Varley, Luke C. Henderson
Summary: This manuscript presents a rapid surface modification method for carbon fibers using small molecules in polypropylene composites. The attachment of n-butylphenyl species onto the fiber surface improved the toughness by 32% and 30% at 10% and 40% weight fractions respectively. The embedded fiber length, fiber weight fraction, and polymer thermal properties were not affected by the modification, suggesting that the mechanical performance changes originated from the installed surface chemistry blending with the polymer phase.
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
(2022)
Article
Materials Science, Multidisciplinary
S. Saeb, S. Firooz, P. Steinmann, A. Javili
Summary: Traditional interface models assume the interface is located at the middle of finite-thickness interphases, but this may not be applicable in graded or inhomogeneous interphases. New research extends the interface model to consider arbitrary interface positions and proves that interface position does not necessarily coincide with the mid-layer. The importance of interface position is demonstrated through a series of examples.
JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS
(2021)
Article
Materials Science, Characterization & Testing
James Thomason
Summary: This paper reviews the potential scaling issues in microbond tests of polymer composites and highlights the differences in structure and properties between microdroplets and macroscale samples.
Article
Materials Science, Composites
Franz Hirsch, Erik Natkowski, Markus Kaestner
Summary: This study explores the application of hybrid composites in lightweight engineering, focusing on the connection of an aluminum component and a glass fiber-reinforced epoxy at the microscale. Numerical investigations were conducted to examine the influence of local interface strength and geometry on macroscopic properties.
COMPOSITES SCIENCE AND TECHNOLOGY
(2021)
Article
Materials Science, Ceramics
Xiaoxu Lue, Longbiao Li, Jiajia Sun, Jinhua Yang, Jian Jiao
Summary: Interphase plays an important role in the mechanical behavior of SiC/SiC ceramic-matrix composites. This study investigates the microstructure and tensile behavior of multilayered (BN/SiC)n coated SiC fiber and SiC/SiC minicomposites. The effects of multilayered interphase on interface shear stress, fiber characteristic strength, tensile damage and fracture behavior, and strength distribution in SiC/SiC minicomposites were analyzed. The multilayered (BN/SiC)n interphase provides protection to the SiC fiber and enhances the interface shear stress and fiber characteristic strength, resulting in improved matrix cracking stress, saturation matrix cracking stress, tensile strength, and fracture strain.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2023)
Article
Mechanics
Kimiyoshi Naito
Summary: This study investigated the interfacial shear strength and fracture mechanism of carbon/glass hybrid rods, finding debonding at the interface between glass fiber bundles and thermoplastic epoxy, with sinusoidal behavior observed during sliding, indicating a relationship between interface roughness and debonding and sliding strength.
COMPOSITE STRUCTURES
(2021)
Article
Mechanics
Anqi Li, Karim Ehab Moustafa Kamel, Badadjida Wintiba, Joris J. C. Remmers, Marc G. D. Geers, Thierry J. Massart
Summary: This study focuses on the debonding processes in woven composites and introduces an implicit geometry description method to generate conforming finite element models by eliminating gaps and inserting cohesive elements.
COMPOSITE STRUCTURES
(2023)
Article
Materials Science, Multidisciplinary
T. Vermeij, R. H. J. Peerlings, M. G. D. Geers, J. P. M. Hoefnagels
Summary: This paper proposes a novel slip system identification framework called SSLIP, which matches the measured displacement gradient fields to the kinematics of theoretical slip systems based on crystal orientations. An optimization problem is solved for each data point to determine the amount of slip conforming to the measured kinematics, resulting in a slip activity field. The framework is demonstrated and validated on different metals, including challenging cases with complex slip mechanisms.
Article
Materials Science, Multidisciplinary
Chuanlai Liu, Franz Roters, Dierk Raabe
Summary: Twin, dislocation, and grain boundary interaction in hexagonal materials have a critical influence on their mechanical properties. Developing a microstructure-sensitive constitutive model is key to designing high-strength and ductile alloys. A mechanical formulation within the finite strain framework was developed to model dislocation slip and deformation twinning-induced plasticity. The model was coupled with a multi-phase-field model to predict twin formation and interactions. The study revealed the role of twin-twin interactions, dislocation accommodation, and stress heterogeneity in the observed twinning behavior.
Article
Mechanics
O. Rokos, R. H. J. Peerlings, J. P. M. Hoefnagels, M. G. D. Geers
Summary: Micromechanical constitutive parameters are important and pose experimental challenges for accurate identification in engineering materials. This paper addresses the parameter identification through multiscale experiments combined with Integrated Digital Image Correlation (IDIC) in conjunction with various computational homogenization schemes. The accuracy and performance of the discussed techniques are analyzed and results demonstrate high accuracy and robustness.
INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES
(2023)
Article
Materials Science, Multidisciplinary
Jaber Rezaei Mianroodi, Pratheek Shanthraj, Alisson Kwiatkowski da Silva, Bob Svendsen, Dierk Raabe
Summary: This study investigates the Mn enrichment at dislocations in Fe-Mn alloys through modeling and experimental characterization. Both finite-deformation microscopic phase-field chemomechanics (MPFCM) and Monte Carlo molecular dynamics (MCMD) are used. The results show that both MPFCM and MCMD predict a non-zero hydrostatic stress field in screw cores, and the amount of solute segregating to screw cores is much less than that to edge cores. The concentration dependence of the solute misfit distortion has the strongest effect, and the prediction of Mn concentration along a straight dislocation line by MPFCM differs from the experimental results.
Article
Engineering, Multidisciplinary
Tobias Kaiser, Thorsten Raasch, Joris J. C. Remmers, Marc G. D. Geers
Summary: This contribution presents an adaptive hierarchical FFT-based approach for solving microscale boundary value problems efficiently. The classic Moulinec-Suquet scheme is enhanced using wavelet analysis, allowing for accurate resolution of localized features and significant reduction in material model evaluations by adaptively refining the computational grid. The performance is demonstrated through a detailed study of one- and two-dimensional representative boundary value problems, achieving up to a 95% reduction in material model evaluations.
COMPUTER METHODS IN APPLIED MECHANICS AND ENGINEERING
(2023)
Article
Crystallography
Francisco-Jose Gallardo-Basile, Franz Roters, Robin M. Jentner, Kinshuk Srivastava, Sebastian Scholl, Martin Diehl
Summary: In this study, two different materials, polygonal ferrite and granular bainite, were prepared by thermomechanical rolling and accelerated cooling. High-resolution crystal plasticity simulations were used to investigate the differences in mechanical response between these two materials. It was found that the microscopic response differs among the materials and there are differences in plasticity onset and strain partitioning. A parameter study was also conducted to explore the correlation between microstructures and damage initiation in this steel.
Article
Polymer Science
Tom Lenders, Joris J. C. Remmers, Tommaso Pini, Peter Veenstra, Leon E. Govaert, Marc G. D. Geers
Summary: The 3D elasto-viscoplastic Eindhoven glassy polymer (EGP) model is extended to describe the rate-dependent behavior of polyvinylidene fluoride (PVDF) components. The extension of the model captures the deformation-dependent evolution of the activation volume and the rate-factor, accurately predicting the short- and long-term rate-dependent behavior of PVDF. The model has been characterized for different temperatures and validated through tension and creep experiments.
JOURNAL OF POLYMER SCIENCE
(2023)
Article
Materials Science, Multidisciplinary
C. Grant, Y. Aboura, T. L. Burnett, P. B. Prangnell, P. Shanthraj
Summary: Intergranular Environmentally-Assisted Cracking (EAC) is a concern in new-generation aluminium alloys, particularly AA7085, when exposed to humid air. The cracking process occurs almost exclusively along grain boundaries and is attributed to hydrogen embrittlement. The impact of heterogeneous grain structures on the growth behavior of microstructurally short cracks is not well understood. Crystal-plasticity simulations using synthetic grain structures have been used to explore the effects of important grain structure variables on the driving force for short-crack growth. The simulations reveal significant reductions and fluctuations in the driving force related to the local grain structure encountered by the crack tip.
Article
Materials Science, Multidisciplinary
Fan Wu, Thomas Flint, Renan M. Kindermann, Matthew J. Roy, Lu Yang, Stuart Robertson, Zhaoxia Zhou, Michael Smith, Pratheek Shanthraj, Paul English, Robert Atwood, Wajira Mirihanage
Summary: Time-resolved X-radiography was used to observe the formation of transient finger-like protrusions at the dissimilar liquid interface during arc welding, followed by a quasi-steady state involving the formation of a short-lived solid phase. Magneto-thermal-hydrodynamic numerical simulations confirmed these observations and explained the mechanisms behind the interface instabilities and melt pool shape. Based on the analysis, practical enhancements were proposed for dissimilar welding through offsetting the heat source.
Article
Mechanics
Anqi Li, Joris J. C. Remmers, Marc G. D. Geers, Thierry J. Massart
Summary: The mechanical response of woven composites under off-axis tensile loading is influenced by damage in the yarn-yarn and yarn-matrix interfaces, causing yarns to rotate and reorient. Updating the material axes during loading is important to achieve realistic results, which can be done using a fiber frame stress rate description or a hyperelastic model. This study reformulates the definition of the fiber frame for woven composites and extends the implementation for an implicit solver in ABAQUS. The simulation results demonstrate a realistic stiffness evolution induced by fiber reorientations compared to the standard ABAQUS implementation.
COMPOSITE STRUCTURES
(2023)
Article
Materials Science, Ceramics
Hao Shi, Diletta Giuntini, Hans van Dommelen, Marc G. D. Geers, Joris J. C. Remmers
Summary: The constitutive relation of Skorohod and Olevsky is used to model shrinkage and relative density evolution in ceramic sintering. An implicit integration scheme is presented, reducing computational cost by combining it with a solid-like shell element formulation. Material viscosity is characterized and identified using the Aquilanti-Mundim deformed Arrhenius description. The model's accuracy and efficiency are tested with benchmark experiments and the use of newly proposed material viscosity functions gives accurate predictions for dimensional shrinkage and relative density evolution, offering the possibility for more accurate and computationally efficient simulation of long-time sintering processes.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2023)
Article
Nanoscience & Nanotechnology
Pushkar Prakash Dhekne, Tijmen Vermeij, Vivek Devulapalli, Suraj Dinkar Jadhav, Johan P. M. Hoefnagels, Kim Vanmeensel
Summary: The plastic deformation mechanisms of heat-treated L-PBF processed Ti-6Al-4V components were studied by in-situ uniaxial tensile loading, revealing the accommodation of higher strain in the transformed beta phase, strain accumulation in primary alpha at interface regions with lower Al content, and strain localization pathways created by needle-shaped secondary alpha precipitates.
SCRIPTA MATERIALIA
(2023)
Article
Engineering, Manufacturing
Bram J. A. Dorussen, Marc G. D. Geers, Joris J. C. Remmers
Summary: This paper presents a ray tracing model to simulate the laser-powder bed interaction for additive manufacturing processes. The proposed methodology accurately captures the interaction of light with complex geometries made of different materials. The simulations demonstrate that the model effectively addresses the reflection, refraction, and absorption of light.
ADDITIVE MANUFACTURING
(2023)
Article
Nanoscience & Nanotechnology
L. Liu, F. Maresca, T. Vermeij, J. P. M. Hoefnagels, M. G. D. Geers, V. G. Kouznetsova
Summary: Through experimental and numerical studies, this research reveals the crucial role of substructure boundary sliding in M/F interface damage, and the strong correlation between low M/F strain partitioning and damage initiation.
SCRIPTA MATERIALIA
(2023)