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
Materials Science, Characterization & Testing
Erwin Wojtczak, Magdalena Rucka, Lukasz Skarzynski
Summary: The paper presents a study on the continuous-time monitoring of mechanical degradation in concrete cubes during splitting, using integrated coda wave interferometry (CWI), digital image correlation (DIC), and X-ray micro-computed tomography (micro-CT). DIC and micro-CT techniques were employed to analyze the fracture process, while CWI method showed promise in assessing damage level based on changes in decorrelation between coda wave signals. This research has potential applications in early detection of concrete element damage.
NDT & E INTERNATIONAL
(2022)
Article
Engineering, Multidisciplinary
Xuanhao Zhang, Lijuan Sun, Bo Wang, Bing Pan
Summary: Digital volume correlation (DVC) is a method to quantify internal 3D displacement and strain fields by correlating volume images acquired from a tested object at different states. This study experimentally investigated the effect of the number of projections on DVC measurements with X-ray CT. The results showed that increasing the number of projections can improve the accuracy and quality of DVC measurements, but it also increases the imaging time.
Article
Radiology, Nuclear Medicine & Medical Imaging
Stefanie J. Bette, Franziska M. Braun, Mark Haerting, Josua A. Decker, Jan H. Luitjens, Christian Scheurig-Muenkler, Thomas J. Kroencke, Florian Schwarz
Summary: In this study comparing PCD-CT and EID-CT in mouse specimens, PCD-CT demonstrated lower image noise, higher SNR, and better edge sharpness compared to EID-CT. Radiologists consistently preferred PCD-CT for visualizing bone details, even in SNR-matched pairs.
EUROPEAN RADIOLOGY
(2022)
Article
Engineering, Biomedical
Aikaterina Karali, Alexander P. Kao, Jurgita Zekonyte, Gordon Blunn, Gianluca Tozzi
Summary: The relationship between microstructure and mechanics of cortical bone during plastic deformation is unclear, and this study provides an in-depth evaluation of the interplay between plastic strain building up and changes in the canal network for cortical bone tissue. The research reveals that regions adjacent to the imprint undergo tensile strain, while the volume underneath experiences compressive strain, with canal loss and disruption occurring in regions of higher compressive strains exceeding -20000 mu epsilon.
JOURNAL OF THE MECHANICAL BEHAVIOR OF BIOMEDICAL MATERIALS
(2021)
Article
Optics
Michal Rawlik, Alexandre Pereira, Simon Spindler, Zhentian Wang, Lucia Romano, Konstantins Jefimovs, Zhitian Shi, Maxim Polikarpov, Jinqiu Xu, Marie-Christine Zdora, Stefano Van Gogh, Martin Stauber, Eduardo G. Yukihara, Jeppe B. Christensen, Rahel A. Kubik-Huch, Tilo Niemann, Cornelia Leo, Zsuzsanna Varga, Andreas Boss, Marco Stampanon
Summary: Refraction-based x-ray imaging can overcome the contrast limit of conventional CT, but is usually limited to high-dose ex vivo applications or requires highly coherent x-ray sources. In this study, we demonstrate that grating interferometry is more dose efficient than conventional CT for imaging of human breast under close-to-clinical conditions. Our system, using a conventional source and commercial gratings, outperformed conventional CT with spatial resolutions better than 263 μm and absorbed dose of 16 mGy. Further progress in grating fabrication is expected to greatly improve clinical CT.
Article
Thermodynamics
Haizhou Liu, Lingtao Mao, Yang Ju, Francois Hild
Summary: In order to investigate the damage development of coal under different loading conditions, in-situ tests in uniaxial and triaxial compression were conducted. Advanced digital volume correlation based on finite element discretization was used to quantify the three-dimensional initial and newborn fractures. The experiments revealed that the damage growth in coal was substantially affected by randomly distributed initial defects, and prior to a macroscopic failure, the coal samples generally experienced pre-existing fracture closure, newborn fracture initiation, interaction and propagation of the two fracture types. The study aimed to gain in-depth insights into the bulk fracture of coal and provide quantitative evidence for further understanding the damage mechanisms from the microscale to the macroscale.
Article
Mechanics
Ruijian Sun, Tao Zheng, Yudi Yao, Danyuan Li, Huiliu Si, Licheng Guo
Summary: A comprehensive experimental method combining microscope observation, multiscale digital image correlation (DIC), and in situ computed tomography (CT) is proposed in this study to investigate the complex damage evolution of 3D woven composites under short beam shear (SBS) loading. The surface damage process and the final damage mode of the specimen are observed using a microscope, and the causes of fiber kinking are explained. Multi-scale DIC is utilized to obtain global and local strain distributions on the specimen surface, providing explanations for the occurrences of weft yarn transverse cracks and interface debonding. Additionally, in situ CT experiment is carried out to identify the reasons for the nonlinear segments of the load-displacement curve and the decline of load bearing capacity of the specimen in the late stage of the experiment. The information obtained from different observation methods is complementary, aiding in the understanding of the complex damage mechanism of 3D woven composites.
COMPOSITE STRUCTURES
(2023)
Article
Radiology, Nuclear Medicine & Medical Imaging
Emmanuel Salinas-Miranda, Gerard M. Healy, Barbara Grunwald, Rahi Jain, Dominik Deniffel, Grainne M. O'Kane, Robert Grant, Julie Wilson, Jennifer Knox, Steven Gallinger, Sandra Fischer, Rama Khokha, Masoom A. Haider
Summary: This study investigated the association between transcriptional subtypes and an externally validated preoperative CT-based radiomic prognostic score (Rad-score). The results showed that high Rad-scores were correlated with the squamous subtype, while low Rad-scores were associated with less lethal subtypes.
EUROPEAN RADIOLOGY
(2022)
Article
Engineering, Geological
Dandan Shi, Xudong Chen, Yingjie Ning, Lihui Bai, Xin Yu
Summary: In this study, macro-synthetic polypropylene (PP) fiber-reinforced shotcrete was designed for the permanent single-layer tunnel lining. The results showed that macro-synthetic PP fibers increased the porosity and the volume of large-diameter pores of the shotcrete, and greatly increased the ductility of the composite.
Article
Materials Science, Composites
Jordan French, Chris Dahlkamp, Elliot Befus, Michael W. Czabaj
Summary: This study presents the development of a novel in-situ biaxial test using synchrotron-based X-ray micro-computed tomography to observe deformation and failure in advanced aerospace materials. By conducting experiments on fabric and laminate specimens, it was found that the test allowed measurement of fabric porosity and fiber straightening, as well as the documentation of crack initiation and evolution in the laminate. The new biaxial test provides a new approach to observe deformation and damage in advanced aerospace materials that was not possible with traditional surface-based observations.
COMPOSITES SCIENCE AND TECHNOLOGY
(2022)
Review
Mechanics
John Holmes, Silvano Sommacal, Raj Das, Zbigniew Stachurski, Paul Compston
Summary: Digital image and volume correlation (DIC and DVC) are used to measure the deformation and damage behavior of composite materials. The heterogeneous nature of the composite microstructure results in complex local behavior that cannot be captured using traditional techniques. DIC and DVC offer significant advantages in monitoring this behavior for fiber-reinforced composite materials. The careful consideration of testing setup and approach is crucial for achieving accurate results.
COMPOSITE STRUCTURES
(2023)
Article
Biochemical Research Methods
May Zaw Thin, Christopher Moore, Thomas Snoeks, Tammy Kalber, Julian Downward, Axel Behrens
Summary: In this paper, a method of lung nodule image acquisition and analysis using a micro-computed tomography scanner is introduced for translational research in lung cancer that closely mimics clinical environments. The method has the advantages of low radiation dose, high resolution, and high-throughput imaging, and utilizes specific image analysis tools for identifying different types of lung tumors.
Article
Radiology, Nuclear Medicine & Medical Imaging
Uttam K. Bodanapally, Thorsten R. Fleiter, Bizhan Aarabi, Ajay Malhotra, Dheeraj Gandhi
Summary: This technical note introduces a new DECT protocol and iodine map reconstruction technique for visualizing membranes in chronic subdural hematoma. Results showed that all 50 hematomas had an enhancing external membrane, with 13 having an incomplete internal membrane and 23 having a complete internal membrane. A spandrel sign indicating partial or complete formation of the internal membrane was observed in 36 hematomas.
EUROPEAN RADIOLOGY
(2023)
Article
Radiology, Nuclear Medicine & Medical Imaging
David Rodriguez-Luna, Olalla Pancorbo, Pilar Coscojuela, Prudencio Lozano, Federica Rizzo, Marta Olive-Gadea, Manuel Requena, Alvaro Garcia-Tornel, Noelia Rodriguez-Villatoro, Jesus M. Juega, Sandra Boned, Marian Muchada, Jorge Pagola, Marta Rubiera, Marc Ribo, Alejandro Tomasello, Carlos A. Molina
Summary: This study aims to derive and validate scores for predicting intracerebral hemorrhage (ICH) expansion using non-contrast CT (NCCT), single-phase CTA, or multiphase CTA markers. The study found that single-phase and multiphase CTA markers have higher discrimination for predicting substantial hematoma expansion compared to NCCT markers. The three scores showed good calibration in both derivation and validation cohorts.
EUROPEAN RADIOLOGY
(2023)
Article
Nanoscience & Nanotechnology
Yangyang Xin, Jian Zhou, Hussein Nesser, Gilles Lubineau
Summary: Wearable healthcare sensors with real-time monitoring capabilities are gaining popularity. The challenge lies in maintaining reliable data while ensuring comfortable wear with good stretchability. This study discusses strain-insensitive design strategies compatible with large deformations and explores the potential of using the Seebeck effect for strain-insensitive sensors.
ADVANCED ELECTRONIC MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Etienne Bousser, Aleksey Rogov, Pavel Shashkov, Ali Gholinia, Nicolas Laugel, Thomas J. A. Slater, Philip J. Withers, Allan Matthews, Aleksey Yerokhin
Summary: This study demonstrates that the high-temperature alpha-Al2O3 phase can still be formed even if microdischarge is fully suppressed under specific processing conditions. Through the use of various techniques, the microstructural and chemical evolutions accompanying the gamma to alpha alumina transition were studied. The results provide strong evidence that the alpha phase can form spontaneously in regions of oxide with the appropriate temperature, grain size, and impurity distributions.
Article
Materials Science, Multidisciplinary
M. D. White, A. Tarakanov, P. J. Withers, C. P. Race, K. J. H. Law
Summary: The study aims to explore methods for converting microstructural image data into compressed numerical descriptions, referred to as microstructural fingerprints. The effectiveness of these fingerprints is assessed through classification tasks and can also be used for regression tasks. The study demonstrates that transfer learning methods based on convolutional neural networks outperform other methods in classification tasks.
COMPUTATIONAL MATERIALS SCIENCE
(2023)
Article
Chemistry, Physical
Md Raju Ahmed, Wajira Mirihanage, Prasad Potluri, Anura Fernando
Summary: Formulating highly stable graphene-based conductive inks with consistent electrical properties over storage has been a challenge in wearable electronics. Two highly stable inks (CEG ink and CT ink) are prepared using different organic solvents, showing high stability and negligible variability in electrical properties even after two months. These inks are used to coat flexible substrates and create wearable e-textiles with significantly low sheet resistance that increases less than 15% over two months. These inks offer high productivity and reproducibility, making them effective for formulating graphene-based inks.
PARTICLE & PARTICLE SYSTEMS CHARACTERIZATION
(2023)
Article
Mathematics, Interdisciplinary Applications
Bram van der Heijden, Yunteng Wang, Gilles Lubineau
Summary: This paper proposes a data-driven approach to predict mechanical responses for structures directly from full-field observations obtained on previously tested structures. The approach uses raw data, called patches, comprising displacement fields obtained during data harvesting through full-field measurement. A library of such patches is compiled to compute responses for new structures, and the approach is not limited to specific types of structures or mechanics.
COMPUTATIONAL MECHANICS
(2023)
Article
Engineering, Multidisciplinary
Fu-qiang Guo, Hui Zhang, Zhen-jun Yang, Yu-jie Huang, Philip J. Withers
Summary: This study develops a computational method for efficiently generating realistic 3D aggregates using micro X-ray Computed Tomography (μXCT) images, spherical harmonic (SH) analysis, and a random-field reconstruction algorithm. The method decomposes the real aggregate surface segmented from CT images, maps it with the SH function to radius fields at different scales, and reconstructs new aggregates based on statistical data and a folding algorithm. The method is verified by comparing morphology indices and demonstrated its flexibility in reconstructing new sets of random aggregates with specified morphology indices.
COMPUTER METHODS IN APPLIED MECHANICS AND ENGINEERING
(2023)
Article
Polymer Science
Mohammad K. A. Khan, Harri Junaedi, Hassan Alshahrani, Ahmed Wagih, Gilles Lubineau, Tamer A. Sebaey
Summary: This study demonstrated an enhancement in notch sensitivity of a hybrid carbon/epoxy (CFRP) composite with a Kevlar core sandwich compared to monotonic CFRP and Kevlar composites. Open-hole tensile samples with different width to diameter ratios were tested, showing that the hybrid laminate has lower notch sensitivity and a higher specific strength compared to CFRP and KFRP laminates. The enhancement in notch sensitivity was attributed to its progressive damage mode and the lower density of Kevlar fibers in the hybrid composite.
Article
Polymer Science
Hatim Alotaibi, Chamil Abeykoon, Constantinos Soutis, Masoud Jabbari
Summary: This paper presents a numerical framework for modelling and simulating convection-diffusion-reaction flows in liquid composite moulding (LCM). The model incorporates cure kinetics and rheological characteristics of thermoset resin impregnation. The simulations show its ability to provide information on flow-front, viscosity development, degree of cure, and rate of reaction at once. The model has been validated with a comparative analysis, showing good agreement with previous research findings.
Article
Materials Science, Multidisciplinary
Ruslan Melentiev, Ran Tao, Gilles Lubineau
Summary: Electrochemical plating is widely used for coating commodity polymers, but the traditional process using chromic acid produces hazardous waste. This study proposes a greener route by hot-embossing and acid-etching the ABS polymer before plating, which greatly enhances coating adhesion and reduces etching time. Microscopic characterization shows that the adhesion strength at the hierarchical interface exceeds that of the ABS polymer. This method can significantly reduce the use of toxic acids in the electroplating industry without compromising the coating quality.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Engineering, Manufacturing
Sheng Wang, Mehmet Cagatay Akbolat, Kali Babu Katnam, Zhenmin Zou, Prasad Potluri, Stephan Sprenger, James Taylor
Summary: This study investigates the impact of hygrothermal ageing on interlaminar fracture of carbon fibre/epoxy composite laminates with different toughening methods. The results show that hygrothermal ageing significantly affects the fracture behavior of baseline and toughened laminates. In particular, the fracture energies of laminates with veil toughening and hybrid nanoparticle and veil toughening are considerably degraded and cannot be restored after re-drying, indicating the irreversible degradation caused by hygrothermal ageing.
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
(2023)
Article
Energy & Fuels
Ali M. Alkadhem, Fernanda Tavares, Natalia Realpe, Gontzal Lezcano, Arief Yudhanto, Mohammad Subah, Vasco Manacas, Jacek Osinski, Gilles Lubineau, Pedro Castano
Summary: Reforming processes for hydrogen production can be improved by incorporating SiC in the catalyst, optimizing constituent mixtures, and addressing heat transfer issues. Various techniques are used to characterize the catalysts and their properties, and models are created to simulate industrial reformers. The results lead to optimal catalyst formulations and showcase the influence of individual and combined constituents at different scales.
Article
Engineering, Chemical
Ran Tao, Lujain Fatta, Ruslan Melentiev, Amit K. Tevtia, Gilles Lubineau
Summary: A typical step in electroplating metals onto polymer substrates is the surface preparation of substrates through sulfochromic acid etching, which modifies the chemistry and morphology of the surfaces. The relative contributions of chemical interactions and mechanical interlocking towards the final adhesion are not well understood. This study proposes different sample preparation strategies to address these issues and finds that chemical contribution is critical for wetting during electroless plating, while mechanical interlocking is the major contributor for the ultimate adhesion of electroplated copper to acrylonitrile-butadiene-styrene interfaces.
INTERNATIONAL JOURNAL OF ADHESION AND ADHESIVES
(2023)
Article
Engineering, Chemical
Ruslan Melentiev, Ran Tao, Xiaole Li, Amit K. Tevtia, Nikhil Verghese, Gilles Lubineau
Summary: Electroless plating is the default industrial process for depositing glossy metallic coatings on ABS plastic parts, but it requires harsh acid etching of the polymer, resulting in hazardous chemical waste. This study develops a theoretical model to understand the coating failure modes at the micro-nano structured interface and validates it through nanofabrication experiments. The results allow for control and optimization of the adhesion strength at the metal-polymer interface for greener electroless plating and durable coating adhesion.
INTERNATIONAL JOURNAL OF ADHESION AND ADHESIVES
(2023)
Article
Multidisciplinary Sciences
Roisul Hasan Galib, Yanpei Tian, Yue Lei, Saichao Dang, Xiaole Li, Arief Yudhanto, Gilles Lubineau, Qiaoqiang Gan
Summary: Global warming exacerbates heat stress, posing a threat to human and social sustainability. To efficiently cool down, reliable and energy-efficient cooling methods are highly desired. Researchers have developed a polyacrylate film made from a self-moisture-absorbing hygroscopic hydrogel for efficient hybrid passive cooling. This film utilizes sodium polyacrylate, one of the lowest-cost industrial materials, to achieve radiative cooling by reducing solar heating and maximizing thermal emission. The manufacturing process uses atmospheric moisture only, without the need for additional chemicals or energy consumption, making it an environmentally friendly process. Under sunlight illumination, the film's surface temperature was reduced by 5 degrees C under partly cloudy skies. The film's hygroscopic feature enables evaporative cooling independent of access to clear skies. This hybrid passive cooling approach is projected to reduce global carbon emissions by 118.4 billion kg/year compared to current electricity-powered air conditioning facilities. The film, with its low-cost raw materials and excellent molding feature, can be manufactured through simple and cost-effective roll-to-roll processes, making it suitable for future building construction and personal thermal management needs.
NATURE COMMUNICATIONS
(2023)
Article
Chemistry, Multidisciplinary
Hussein Nesser, Hassan A. Mahmoud, Gilles Lubineau
Summary: Structural health monitoring (SHM) is essential for ensuring safety in various applications. Traditional sensors have limitations, but a new technology using RFID allows wireless transmission of strain measurement data. The novel sensor based on LC circuit and cracked capacitor electrodes offers a wireless strain sensor with high sensitivity. This wire-free, power-free design can be easily integrated into composites without compromising structural integrity, providing a cost-effective and non-destructive solution for accurate structural health monitoring.
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)
