Article
Materials Science, Multidisciplinary
Kungang Zhang, Daniel W. Apley, Wei Chen
Summary: This paper introduces a score-based framework for analyzing nonstationarity in stochastic materials microstructures, by training a supervised learning model to predict pixel values in micrographs and using the Fisher score vector to determine changes in local stochastic nature. The approach demonstrates power and versatility in analyzing various types of stochastic microstructures without prior knowledge of nonstationarities or the microstructure itself.
Article
Computer Science, Interdisciplinary Applications
Bin Li, Xiaoying Zhuang, Xiaolong Fu, Timon Rabczuk
Summary: This paper presents a new methodology for topology optimization of microstructures based on perturbation analysis and the penalty methods. The homogenized material coefficients are computed numerically using perturbation analysis, and periodic boundary conditions are imposed using the penalty methods. Sensitivity analysis is implemented without the need for the adjoint method, and the method can also be extended to multi-field analysis.
STRUCTURAL AND MULTIDISCIPLINARY OPTIMIZATION
(2023)
Article
Materials Science, Multidisciplinary
Jyoti S. Jha, Suraj P. Toppo, Rajkumar Singh, Asim Tewari, Sushil K. Mishra
Summary: The dual-phase titanium alloy Ti-6Al-4V can be thermomechanically treated to produce various microstructures affecting its mechanical properties. The equiaxed microstructure exhibits the highest elongation, while the alpha'-lath morphology shows the lowest elongation. The deformation mechanisms of slip, twin, and fracture depend on the microstructure morphology in Ti-6Al-4V.
MATERIALS CHARACTERIZATION
(2021)
Article
Metallurgy & Metallurgical Engineering
Li Dianzhong, Wang Pei
Summary: In the development of metal materials, designing microstructures to meet specific property requirements is crucial. Microstructure tailoring involves designing mesoscale microstructure, establishing quantitative relation between microstructures and properties, and iteratively optimizing and fabricating microstructures to fulfill the desired properties. Purification and homogenization of metals are prerequisites for microstructure tailoring. A case study on M50 (G80Cr4Mo4V) steels used for aircraft engine bearings demonstrated the importance of controlling macro-segregation and purifying metals in tailoring the microstructure for desired fatigue-life requirements. With advancements in technology, microstructure tailoring along with data science and modeling will contribute to optimized alloy design and the development of green materials.
ACTA METALLURGICA SINICA
(2023)
Article
Construction & Building Technology
Ji-Su Kim, Jeewoo Suh, Junil Pae, Juhyuk Moon, Tong-Seok Han
Summary: This study investigated the microstructural evolution of cement paste during hydration using micro-CT imaging and developed a phase segmentation method based on mean LAC values. The method proved effective in identifying characteristics of pores, hydrates, and clinkers.
JOURNAL OF BUILDING ENGINEERING
(2022)
Article
Materials Science, Multidisciplinary
Lun Che, Zhongping He, Kaiyuan Zheng, Tianyu Si, Meiling Ge, Hong Cheng, Lingrong Zeng
Summary: This review explores the applications, challenges, and prospects of deep learning in the microstructure analysis of alloy materials. It highlights how deep learning can extract features from a large volume of alloy microstructure data and accurately classify them, leading to the establishment of the microstructure-performance relationship for effective performance prediction. It also discusses the use of deep learning in tasks like image segmentation in alloy microstructure images, facilitating the extraction of pertinent information from complex images.
MATERIALS TODAY COMMUNICATIONS
(2023)
Article
Engineering, Manufacturing
Kaitlyn Bower, Metin Ornek, Troy Ansell, I. Emre Gunduz
Summary: Additive manufacturing with high-viscosity pastes can improve part density, reduce slumping and shrinkage. Vibration assisted printing (VAP) is effective in extruding high viscosity materials. However, the mechanical properties and microstructural features of printed parts using viscous pastes are not well understood. This study aims to investigate the effect of printing high viscosity materials on morphology and mechanical behavior.
ADDITIVE MANUFACTURING
(2023)
Article
Polymer Science
Sebastian Strauss, Frederik Wilhelm, Andreas Senz, Herbert Engelen, Simon Boysen, Niko Rilli, Alptekin Celik, Marcel Ratka, Christian Bonten
Summary: The open bath impregnation method is enhanced to closed resin-injection pultrusion (CIP) for the use of innovative higher-performance resin systems. The study investigates the influence of resin viscosity, opening angle, and opening factor on the process pressures in the injection and impregnation chamber. A newly developed simulation model based on Darcy's law is validated using data obtained from pultrusion trials.
Article
Engineering, Manufacturing
Alexander Edwards, Daniel Weisz-Patrault, Eric Charkaluk
Summary: The properties of duplex stainless steels are highly influenced by their thermal history, which can result in a wide range of ferrite-austenite ratios. Additive manufacturing of duplex steels is challenging due to the difficulty in predicting and controlling the phase ratio based on process parameters. This paper focuses on a fast numerical modeling approach for thermal history and diffusion controlled phase transformations in directed energy deposition additive manufacturing, and proposes a temperature control strategy to achieve near 50-50 phase ratios.
ADDITIVE MANUFACTURING
(2023)
Article
Construction & Building Technology
Xun Li, Juan Wang, Hongyuan Fang
Summary: This study investigates the effect of crushed stone aggregates on polymer composites and proposes a method for determining the interface transition zone. The results show that two types of ITZs exist in the composites, with their relative content and thickness being influenced by polymer density and particle spacing.
CONSTRUCTION AND BUILDING MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Ioannis Ntintakis, Georgios E. Stavroulakis
Summary: Additive Manufacturing (AM) is an advanced method for manufacturing high-strength and lightweight microstructures. Topology Optimization (TO) can create high-strength and mass optimized microstructure lattices. Experimental studies show that the mapping angle of the lattice structure significantly affects its mechanical behavior.
APPLIED SCIENCES-BASEL
(2022)
Article
Engineering, Mechanical
T. S. Matos, K. F. Portella, S. L. Henke, M. O. G. P. Braganca, M. P. Galvao, B. G. Dias, L. Lagoeiro, L. M. Almeida
Summary: This study conducted a comprehensive analysis of the microstructures, corrosion products, and environment of corroded anchor rods in guyed towers, identifying key factors related to corrosion.
ENGINEERING FAILURE ANALYSIS
(2021)
Article
Engineering, Industrial
Peihao Geng, Guoliang Qin, Jun Zhou, Tongyi Li, Ninshu Ma
Summary: The study revealed that dynamic recrystallization (DRX) behavior was promoted at higher temperatures and lower strain rates, and no 8 phase existed at or above 1333 K deformation temperature. A significant yield drop occurred within the temperature range varying from 1273 K to 1333 K due to the dissolution of the 8 phase and enhanced mobility of defects.
JOURNAL OF MATERIALS PROCESSING TECHNOLOGY
(2021)
Article
Chemistry, Physical
Rubayyat Mahbub, Tim Hsu, William K. Epting, Gillian Nolan, Yinkai Lei, Noel T. Nuhfer, Randell B. Doane, Harry W. Abernathy, Gregory A. Hackett, Shawn Litster, Anthony D. Rollett, Paul A. Salvador
Summary: The study explores the morphological differences in microstructures of commercial SOFC electrodes and quantifies relative microstructural changes in Ni and pore distributions, showing that scaled-adjusted electrodes have comparable ANOVA sub-volumes.
JOURNAL OF POWER SOURCES
(2021)
Review
Chemistry, Physical
Liang Deng, Guangming Chen
Summary: In recent years, research on thermoelectric materials based on conjugated polymers has grown exponentially due to their advantages and potential applications. This review discusses the importance of oriented microstructure in governing polymer performance and reviews recent progress in orienting conjugated polymers for thermoelectric applications, as well as discussing the underlying mechanisms and future prospects.
Article
Engineering, Manufacturing
Mahoor Mehdikhani, Christian Breite, Yentl Swolfs, Martine Wevers, Stepan V. Lomov, Larissa Gorbatikh
Summary: DIC is applied to analyze individual fiber misalignment in continuous fiber composites using CT slices, providing an efficient estimation method for actual fiber displacement. The method is validated on synchrotron CT images of glass/epoxy and carbon/epoxy laminates, demonstrating its ability to quantify misalignment evolution during tension. This approach offers a shortcut for characterizing fiber orientation distribution moments compared to traditional algorithms.
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
(2021)
Article
Materials Science, Composites
Mahoor Mehdikhani, Christian Breite, Yentl Swolfs, Jeroen Soete, Martine Wevers, Stepan V. Lomov, Larissa Gorbatikh
Summary: This study explores the potential of Digital Volume Correlation (DVC) in detecting and characterizing damage in fiber-reinforced composites using in-situ X-ray Computed Tomography. Through preliminary analysis of digital deformation images and real-deformation images acquired during in-situ tensile loading, DVC proves to be a promising tool for quantification of deformation and damage at both mesoscale and microscale levels. Damage mechanisms in fiber-reinforced composites are successfully detected and characterized using DVC, showing the limitations of traditional methods like grayscale thresholding.
COMPOSITES SCIENCE AND TECHNOLOGY
(2021)
Article
Engineering, Manufacturing
M. Bodaghi, M. Mobin, D. Ban, S. Lomov, M. Nikzad
Summary: This study evaluated the surface quality of textile-like porous media fabricated by different 3D printing techniques using a 3D optical profilometer, with SLA technique producing the smoothest surface. The surface parameters of MJF samples were found to be lower than those of FDM samples, indicating a smoother surface in MJF production compared to FDM due to the different filling patterns.
MATERIALS AND MANUFACTURING PROCESSES
(2022)
Article
Engineering, Multidisciplinary
Francisco Mesquita, Yentl Swolfs, Stepan V. Lomov, Larissa Gorbatikh
Summary: This study conducted in-situ synchrotron computed tomography (CT) tensile tests and modeling to investigate the hybrid effect in carbon-glass hybrid composites. The results showed that hybrid composites have a higher fiber break density in their carbon plies compared to non-hybrid carbon fiber composites. Fibers near a ply interface were more likely to fail, augmenting the hybrid effect.
COMPOSITES PART B-ENGINEERING
(2022)
Article
Engineering, Multidisciplinary
S. B. Sapozhnikov, S. Lomov, Y. Swolfs, V Carvelli
Summary: An experimental study was conducted to investigate the elastic and pseudo-ductile deformation processes of carbon fibre reinforced plastics with low elongation (LE) and high elongation (HE) layers. The study examined the stable elastic deformation, microdamage accumulation, and delamination of the LE and HE layers. The results showed that the quasi-isotropic hybrid laminates exhibited good performance in terms of notch sensitivity.
COMPOSITES PART B-ENGINEERING
(2022)
Article
Engineering, Multidisciplinary
Francisco Mesquita, Arsen Melnikov, Ashok Rajpurohit, Vicky Singery, Phillipe Sanial, Stepan Lomov, Yentl Swolfs
Summary: UD non-crimp fabric (NCF) carbon/epoxy composites were tested to evaluate the impact of stitching on the tensile failure strain. The results showed that the stitched layers had the same failure strain as the non-stitched layers, while removing the stitches resulted in a lower failure strain.
COMPOSITES PART B-ENGINEERING
(2022)
Article
Materials Science, Composites
Francisco Mesquita, Christian Breite, Stepan V. Lomov, Yentl Swolfs
Summary: This study proposed a methodology for retrieving the Weibull parameters of fiber strength using in-situ synchrotron computed tomography tensile testing. Different methods were used to estimate the parameters, and the results showed that non-linear regression had a better correlation with the observed fiber strength probability. The study also found that the strength distribution of fibers can vary within a given material batch.
COMPOSITES SCIENCE AND TECHNOLOGY
(2022)
Article
Materials Science, Composites
M. Alves, L. M. Martulli, M. Kerschbaum, Y. Swolfs, S. V. Lomov Sw, S. Pimenta
Summary: This work presents a novel 3D approach for the numerical modelling of TBDCs, which generates 3D orientation tensors by adding a stochastic component and predicts the failure initiation of the materials using a physically based 3D failure criterion. Experimental results demonstrate that the proposed approach accurately predicts the mechanical properties of the materials.
COMPOSITES SCIENCE AND TECHNOLOGY
(2023)
Article
Mechanics
Xiao Ma, Yang Chen, Modesar Shakoor, Dmytro Vasiukov, Stepan V. Lomov, Chung Hae Park
Summary: This paper focuses on the numerical implementation of phase-field models of fracture using the Fast Fourier Transform based numerical method. The influence of a simplification in the phase-field evolution equation on heterogeneous materials is assessed and a complete formulation is proposed. The assessment shows that the simplified formulation leads to artificial diffusion of damage between different components, while the complete formulation suppresses this diffusion.
ENGINEERING FRACTURE MECHANICS
(2023)
Article
Materials Science, Multidisciplinary
Deepjyoti Dhar, Stepan V. V. Lomov, Atul Jain
Summary: In this article, the predictive abilities of two prevalent homogenization formulations, two-step Mori-Tanaka (MT-MT) and MT-Voigt, are benchmarked using virtual representative volume element (RVE) and real RVE. Both schemes have similar predictive capabilities for the effective modulus and phase average stress, but may not accurately predict the strain distribution for complex microstructures.
MECHANICS OF ADVANCED MATERIALS AND STRUCTURES
(2022)
Article
Multidisciplinary Sciences
Valter Carvelli, Stepan V. Lomov, Sergei B. Sapozhnikov, Christian Breite, Yentl Swolfs
Summary: This paper provides an overview of the fatigue behavior of hybrid fiber-reinforced plastics and specifically reports the fatigue behavior of a quasi-isotropic pseudo-ductile all-carbon fiber interlayer hybrid composite. Experimental measurements and observations are conducted to study the damage development, and the results include fatigue life, stiffness evolution, and damage observations.
PHILOSOPHICAL TRANSACTIONS OF THE ROYAL SOCIETY A-MATHEMATICAL PHYSICAL AND ENGINEERING SCIENCES
(2023)
Article
Polymer Science
Radmir Karamov, Christian Breite, Stepan V. Lomov, Ivan Sergeichev, Yentl Swolfs
Summary: The study investigates the progressive development of fibre breaks in unidirectional composite materials using in situ X-ray computed tomography. By applying super-resolution (SR) using 3D deep learning techniques, the quality of low-resolution scans is enhanced for fibre break identification. The developed approach achieves automated identification of fibre breaks with an average accuracy of 82% to 92%.
Article
Physics, Applied
Sergey G. G. Abaimov, Iskander S. S. Akmanov, Stepan V. V. Lomov
Summary: In the digital era, computational performance becomes crucial for the design of novel smart materials. Nanocomposites present a challenge due to the complex morphology and interactions. This study overcomes the singularity issue in thermal analysis of carbon nanotube (CNT) nanocomposites by developing a technique based on undocumented possibilities in Abaqus software. Numerical simulations using 3D particle morphology obtained by electron tomography show close agreement with experimental measurements.
APPLIED PHYSICS LETTERS
(2023)
Article
Mechanics
Xiao Ma, Dmytro Vasiukov, Modesar Shakoor, Stepan V. Lomov, Chung Hae Park
Summary: This paper focuses on the numerical implementation of phase-field models of fracture using the Fast Fourier Transform (FFT) based numerical method. The choice of regularization length in phase-field models is important for both macroscopic mechanical behavior and local crack propagation patterns. Wu's phase-field model has been successful in reducing length sensitivity for homogeneous materials, and it has also been found to be more suitable than Miehe's model for brittle failure with the introduction of an elastic stage. The sensitivity of Wu's model for heterogeneous materials has also been investigated in this study.
ENGINEERING FRACTURE MECHANICS
(2023)
Article
Engineering, Manufacturing
Babak Fazlali, Shailee Upadhyay, Sagar Ashokbhai Ashodia, Francisco Mesquita, Stepan Lomov, Valter Carvelli, Yentl Swolfs
Summary: Tensile testing of unidirectional composites often results in premature failure in the end tab region. This study investigates different conventional and novel designs to find the method that minimizes geometric discontinuity and maximizes failure strain. Finite element models are used to predict stress concentrations and optimize the geometry of the end tabs. Experimental results show that specimens with novel arrow-shaped tabs and continuous tabs yield the highest failure strain, avoiding premature failure effectively.
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
(2023)
Article
Mechanics
Rawan Aqel, Patrick Severson, Rani Elhajjar
Summary: A novel core splice joint configuration for composite sandwich structures is studied and proposed to improve the strength and toughness. Experimental and numerical efforts show that this configuration can significantly increase the ultimate strength by 13% to 51% and the toughness by 2% to 35%.
COMPOSITE STRUCTURES
(2024)
Article
Mechanics
Xianheng Wang, Cong Chen, Jinsong Zhang, Xinming Qiu
Summary: In this paper, a new form-finding method based on spatial elastica model (FMSE) is proposed for elastic gridshells. The method integrates the deformations of elastic rods into the overall deformation of the gridshell, and solves a set of transcendental equations using the quasi-Newton method to ensure the deformation satisfies the given boundary conditions. The method is validated through experiments and expected to have potential applications in the investigations of elastic gridshells.
COMPOSITE STRUCTURES
(2024)
Article
Mechanics
Hao Huang, Zitong Guo, Zhongde Shan, Zheng Sun, Jianhua Liu, Dong Wang, Wang Wang, Jiale Liu, Chenchen Tan
Summary: The conventional evaluation of 3D braided composites' mechanical properties through numerical and experimental methodologies hinders material application due to the expenses, time constraints, and laborious efforts involved. This study establishes a multi-scale finite element model and a surrogate model for predicting the elastic properties of 3D4D rotary braided composites with voids. By optimizing a neural network model, the results are validated and provide valuable insights into the microstructure and properties of these composites.
COMPOSITE STRUCTURES
(2024)
Article
Mechanics
Xinyu Li, Hao Zhang, Haiyang Yang, Junrong Luo, Zhongmin Xiao, Hongshuai Lei
Summary: Due to their excellent mechanical properties and design flexibility, fluted-core composite sandwich structures have gained significant attention in aerospace and rail transit applications. This study investigated the free-vibration characteristics and optimized design of composite fluted-core sandwich cylinders through theoretical models and experimental tests.
COMPOSITE STRUCTURES
(2024)
Article
Mechanics
Chao Li, Chunzheng Duan, Xiaodong Tian, Chao Wang
Summary: A mechanistic model considering the bottom edge cutting effect and the anisotropic characteristics of the material is proposed in this paper to accurately predict cutting forces. The model was validated through a series of milling experiments and can be used to predict the cutting force of various parts of the cutter and any feed direction.
COMPOSITE STRUCTURES
(2024)
Article
Mechanics
Camila Sanches Schimidt, Leopoldo Pisanelli Rodrigues de Oliveira, Carlos De Marqui Jr
Summary: This work investigates the vibro-acoustic performance of graded piezoelectric metamaterial plates. The study shows that piezoelectric metamaterial plates with reconfigurable properties can provide enhanced vibration and sound power attenuation.
COMPOSITE STRUCTURES
(2024)
Article
Mechanics
Jun Ke, Li-jie Liu, Zhen-yu Wu, Zhong-ping Le, Luo Bao, Dong-wei Luo
Summary: Compared with other green natural fibers, ramie has higher mechanical properties and lower cost. In this study, ramie and glass fiber are made into composite circular tubes. The results show that the hybrid circular tube with ramie and glass fiber has improved torsional mechanical properties and reduced weight and cost. The failure mechanisms are affected by the loading direction and the content of each fiber.
COMPOSITE STRUCTURES
(2024)
Article
Mechanics
Natalia Pingaro, Gabriele Milani
Summary: This paper proposes an enhanced analytical model for predicting the behavior of FRCM samples tested under standard tensile tests. The model takes into account the interaction between fibers and matrix through the interface, and assumes different material properties at different phases. By solving a second order linear differential equation, an analytical solution can be obtained. The model is validated with experimental data and shows good predictability.
COMPOSITE STRUCTURES
(2024)
Article
Mechanics
Jialiang Fan, Anastasios P. Vassilopoulos, Veronique Michaud
Summary: This article investigates the effects of voids, joint geometry, and test conditions on the fracture performance of thick adhesive Double Cantilever Beam (DCB) joints. It concludes that grooved DCB joints with low void content tested at low displacement rates showed stable crack propagation without significant crack path deviation.
COMPOSITE STRUCTURES
(2024)
Article
Mechanics
Auwalu I. Mohammed, Kaarthikeyan Raghupathy, Osvaldo De Victoria Garcia Baltazar, Lawson Onokpasah, Roger Carvalho, Anders Mogensen, Farzaneh Hassani, James Njuguna
Summary: This study investigates the performance of composite pressure vessels under damaged and undamaged conditions, providing insights into their reliability and residual strength capabilities. The results demonstrate that the damage profile and its effect on compressive strength are similar between damaged and non-damaged cylinders. When subjected to quasi-static compression, the polyethylene liner absorbs enough elastic strain energy to recover without plastic deformation. Additionally, quasi-static compression has little to no influence on the axial strength of the cylinders. The damage characterization reveals fiber breakage, delamination, local buckling, and brooming failure. This study has direct implications for the safety design tolerances, manufacturing strategies, and operational failure conditions of composite overwrapped pressure vessels (COPVs).
COMPOSITE STRUCTURES
(2024)
Article
Mechanics
Muhammad Irfan Shirazi, Samir Khatir, Djilali Boutchicha, Magd Abdel Wahab
Summary: Structural health monitoring is important to ensure the safety of components and structures. This study proposes a method using finite element models and 1D-CNN network to extract and classify vibration responses for crack detection. The results show that the proposed approach is effective in real-time damage detection.
COMPOSITE STRUCTURES
(2024)
Article
Mechanics
Maryam Mirsalehi, Kiarash Kianpour, Sharif Shahbeyk, Mohammad Bakhshi
Summary: This study comprehensively investigates the one-way response of 3D-woven sandwich panels (3DWSPs) and their interfering parameters, providing interpretation of elastic and failure results, failure maps, and reliable theoretical models for linear elastic response and observed failure mechanisms.
COMPOSITE STRUCTURES
(2024)
Article
Mechanics
Yiming Zhao, Zhonggang Wang, Zhigang Yang, Bin Qin
Summary: The paper proposes a Ritz and statistical energy analysis (Ritz SEA) hybrid method for calculating rectangular plate acoustic vibration coupling in the mid-frequency range. This method combines the fast convergence and ability to handle arbitrary boundary conditions of the Ritz method with the power flow equation of the statistical energy analysis method. The results show that this approach effectively filters out random fluctuations in mid-frequency domains while demonstrating exceptional stability and precision.
COMPOSITE STRUCTURES
(2024)
Article
Mechanics
Joao Henrique Fonseca, Woojung Jang, Dosuck Han, Naksoo Kim, Hyungyil Lee
Summary: This study addresses the enhancement of an injection-molded fiber-reinforced plastic / metal hybrid automotive structure and its plastic injection molding process through the integration of the finite element method, artificial intelligence, and evolutionary search methods. Experimental validation of finite element models, the generation of a database through orthogonal array and Latin hypercube methods, and the training of artificial neural networks are conducted. The genetic optimization algorithm is then applied to identify optimal process parameters. The results show significant reduction in product warpage and manufacturing time while maintaining structural strength, contributing to the advancement of composite automotive structures with superior quality.
COMPOSITE STRUCTURES
(2024)
Article
Mechanics
Alessandro Vescovini, Carina Xiaochen Li, Javier Paz Mendez, Bo Cheng Jin, Andrea Manes, Chiara Bisagni
Summary: This paper presents a study on six single-stringer specimens manufactured using the card-sliding technique with non-crimp fabrics and adopting a Double-Double (DD) stacking sequence. The specimens were tested under compression loading conditions to investigate post-buckling and failure in aerospace structures. Experimental results and numerical simulations were compared to analyze the behavior and failure modes of the specimens. The study found promising evidence of a viable solution to optimize aeronautical structures and enhance resistance to skin-stringer separation, particularly with the use of tapered flanges.
COMPOSITE STRUCTURES
(2024)
