Article
Engineering, Multidisciplinary
Kaleeswaran Balasubramaniam, Shirsendu Sikdar, Rohan Soman, Pawel Malinowski
Summary: This paper investigates the use of ultrasonic guided wave propagation and a multi-step approach to assess debonding in a sandwich composite structure. The proposed structural health monitoring strategy effectively detects and locates debonding and damages using a quick damage identification matrix map and improved elliptical wave processing. Experimental and numerical results support the effectiveness of the proposed approach.
Article
Engineering, Multidisciplinary
Piero Paialunga, Joseph Corcoran
Summary: This paper proposes a damage detection method using permanently installed guided wave sensors, which involves identifying changes in A-scan data from a defect-free state. The method utilizes the unique amplitude-temperature dependence and associated uncertainty of each location in an A-scan to determine an adaptive threshold. The performance of the method exceeds that of Optimal baseline subtraction (OBS) when the training set exceeds around 40 measurements.
STRUCTURAL HEALTH MONITORING-AN INTERNATIONAL JOURNAL
(2023)
Article
Engineering, Mechanical
Thomas Bergmayr, Markus Winklberger, Christoph Kralovec, Martin Schagerl
Summary: This paper investigates a strain-based structural health monitoring method for damage detection and localization in composite sandwich structures, using numerical and experimental analysis to demonstrate its effectiveness for edge structure.
ENGINEERING FAILURE ANALYSIS
(2021)
Article
Materials Science, Composites
Xiaoqiang Wang, Xiangrui Fan, Shaowei Lu, Lu Zhang, Xiaowei Jiang, Jian Lu, Bo Li, Chengkun Ma, Xingmin Liu
Summary: In this article, the repair of damaged composite materials using stitched carbon fiber line was studied, and real-time structural health monitoring was conducted using traditional Buckypaper sensors and novel MXene sensors. The experimental results showed that the stitched repaired specimen had higher breaking strength, and both types of sensors were able to monitor the load in real-time, with the MXene sensors having higher sensitivity.
POLYMER COMPOSITES
(2022)
Article
Materials Science, Composites
Xiaoqiang Wang, Jian Lu, Shaowei Lu, Bo Li, Lu Zhang, Chengkun Ma, Keming Ma, Lunyang Lin, Xiaowei Jiang, Bin Yang
Summary: A novel MXene film sensor technology is proposed in this study for real-time monitoring of the structural health of composite structures, obtaining MXene thin films with excellent properties through the proposed preparation method. MXene sensors can be arranged in arrays on composite repair structures to monitor strains at different locations, offering a more effective and comprehensive monitoring process.
COMPOSITES COMMUNICATIONS
(2021)
Article
Engineering, Multidisciplinary
Ahmad Amer, Fotis Kopsaftopoulos
Summary: A novel structural damage quantification framework is proposed in this study, based on Damage Indices (DIs) and Gaussian Process Regression Models (GPRMs). The framework takes a simple approach to quantify damage and provides confidence bounds on the estimated states. It is successfully applied to three test cases, achieving quantitative analysis of varying structural states.
STRUCTURAL HEALTH MONITORING-AN INTERNATIONAL JOURNAL
(2023)
Article
Computer Science, Artificial Intelligence
Michael Thomas Smith, Kathrin Grosse, Michael Backes, Mauricio A. Alvarez
Summary: Protecting ML classifiers from adversarial examples is crucial. In this paper, we propose an adversarial bound that quantifies the risk of future adversarial attacks by bounding the potential of confident misclassification. We test this bound using multiple datasets and demonstrate its effectiveness in producing relevant and practical results.
Article
Engineering, Mechanical
Qisheng Wang, Xin Lin, Xianyin Duan, Ruqiang Yan, Jerry Ying Hsi Fuh, Kunpeng Zhu
Summary: Laser powder bed fusion (L-PBF) is a metal additive manufacturing process with potential for high-performance metal components. However, stability and repeatability issues limit its industrial application. To ensure product quality, process monitoring and control are crucial. A new motion feature is extracted and a classification model is constructed to identify the changing melt pool states during the L-PBF process. The Gaussian process classification (GPC) model achieves better recognition results compared to other models, with an overall recognition rate of 87.1%.
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2023)
Article
Engineering, Multidisciplinary
Yangtao Li, Tengfei Bao, Zexun Chen, Zhixin Gao, Xiaosong Shu, Kang Zhang
Summary: In this study, a multi-task Gaussian process regression (mGPR) method is proposed to reconstruct missing data from faulty sensors by capturing the correlation among multiple sensors as a whole. The approach efficiently and accurately learns missing data from faulty sensors in dam SHM systems, showing significantly better performance compared to conventional multiple GPR methods.
Article
Engineering, Electrical & Electronic
Alize Vaihiria Gaumet, Richard J. Ball, Alain Nogaret
Summary: The study introduces the synthesis and testing of miniature sensors for structural health monitoring, capable of detecting strain relaxation events and providing early warning of plastic deformation in materials. The sensors are made of thin composite films of polydimethylsiloxane and graphite nanoparticles that conduct via tunneling percolation, showing high sensitivity to deformation.
SENSORS AND ACTUATORS A-PHYSICAL
(2021)
Article
Materials Science, Composites
Lu Zhang, Yao Lu, Shaowei Lu, Xiaoqiang Wang, Chengkun Ma, Keming Ma
Summary: This paper presents the preparation of a flexible MXene/CNT film by self-assembly process, which is used for online monitoring of resin flow during complex liquid composite molding. The study reveals the response mechanisms of MXene/CNT sensors and compares different permeability. The presence of polyvinyl chloride (PVC) interlayer is found to significantly influence resin flow and penetration.
POLYMER COMPOSITES
(2022)
Review
Chemistry, Analytical
Sahar Hassani, Mohsen Mousavi, Amir H. Gandomi
Summary: This study provides a comprehensive review of the history and development of damage-detection methods in composite structures. It emphasizes the importance of early damage detection to prevent catastrophic events and discusses various testing techniques and vibration-based methods. The study also highlights the use of advanced signal processing, machine learning, and deep learning in solving damage-detection problems. Additionally, it focuses on the application of smart composites and concludes with suggestions for future work.
Review
Engineering, Manufacturing
M. S. Irfan, T. Khan, T. Hussain, K. Liao, R. Umer
Summary: Carbon nanomaterial-coated piezoresistive fiber sensors are utilized for in-situ process and structural health monitoring of composites in various industries. These sensors can be embedded in composites by incorporating them in the matrix or depositing them on fibrous reinforcements. Different strategies for coating carbon nanomaterials on fiber reinforcements are discussed, along with the review of monitored parameters during composites manufacturing and damage detection using nanomaterial-coated in-situ sensors. Current and future challenges are highlighted, focusing on new types of 2D materials for next generation smart sensors.
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
(2021)
Article
Mathematics, Applied
Maike A. F. dos Santos, Fernando D. Nobre, Evaldo M. F. Curado
Summary: The crossover between different Levy processes is an important theme in nonequilibrium statistical physics. Two models are proposed in this work to generate crossovers, demonstrating qualitatively similar results far from the crossover regime. These models are expected to be useful for describing crossovers among distinct diffusive regimes in complex systems.
COMMUNICATIONS IN NONLINEAR SCIENCE AND NUMERICAL SIMULATION
(2021)
Article
Materials Science, Composites
Kundo Park, Youngsoo Kim, Minki Kim, Chihyeon Song, Jinkyoo Park, Seunghwa Ryu
Summary: In this study, a Bayesian optimization framework was proposed to design a staggered platelet structure with high toughness. By using Gaussian process regression and the Markov chain Monte Carlo algorithm, a staggered platelet pattern with a toughness 12% higher than the best sample in the initial training set was successfully designed. This optimization framework, which does not rely on material theories and models, can be applied to various other material optimization problems based on a limited set of experiments or computational simulations.
COMPOSITES SCIENCE AND TECHNOLOGY
(2022)
Article
Mathematics, Applied
S. Slimani, I Medarhri, K. Najib, A. Zine
NUMERICAL ALGORITHMS
(2020)
Article
Mechanics
Bo Yang, Christophe Droz, Abdelmalek Zine, Mohamed Ichchou
Summary: The article applies Mindlin's SSG theory and WFEM framework to analyze the dynamic behavior of one-dimensional bending beams and torsional bars, deriving strong and weak forms of continuum models for bending and torsion cases. LSMs are introduced as discrete micro-structural descriptions to compute wave dispersion characteristics in unit-cell structures, comparing results of SSG and CT in micro-sized structures.
COMPOSITE STRUCTURES
(2021)
Article
Engineering, Marine
Alexandre Kawano, Abdelmalek Zine, Celso Morooka, Mohamed Ichchou
Summary: This work aims to analyze a dynamical model for the transversal motion of a vertical riser and proposes a new numerical approach to solve the resulting system of coupled differential equations. The proposed model, in which transversal displacements are coupled with longitudinal ones, is analyzed mathematically with the existence and uniqueness of the resulting system of differential equations proved. The numerical model based on finite element method is successfully implemented in a Matlab code and compared with commercial computation code ORCAFLEX and experiments, showing very satisfactory results.
Article
Acoustics
Guang Zhu, Abdelmalek Zine, Pascal Fossat, Mohamed Ichchou
Summary: In this work, an enriched Timoshenko beam model is utilized to study the free wave propagation, frequency response, and sound radiation under non-classical bending and shear motion, considering the local behavior of internal heterogeneity. Dispersive behaviors, modal density, and energy flow are analyzed, revealing the significance of local behavior in non-classical structural behavior.
JOURNAL OF SOUND AND VIBRATION
(2021)
Article
Mechanics
Guang Zhu, Abdelmalek Zine, Christophe Droz, Mohamed Ichchou
Summary: This study employed models based on the second strain gradient theory and scattering matrix method to investigate wave transmission and reflection in complex media, as well as the impact of internal heterogeneity in coupling regions on wave scattering properties. The results indicate the potential of the proposed approach in studying vibration transmission control by enriching a waveguide's internal structure.
EUROPEAN JOURNAL OF MECHANICS A-SOLIDS
(2021)
Article
Engineering, Mechanical
Bo Yang, Abdelmalek Zine, Christophe Droz, Mohamed Ichchou
Summary: This paper explores the wave propagation characteristics of micro-sized structures using higher order gradient elasticity theories, specifically the Second Strain Gradient (SSG) theory. The study derives the governing equations and boundary conditions of the continuum model and provides a valuable Lattice Spring Model (LSM) to explain the SSG-based model. The dynamic properties of a 2D beam grid are analyzed within the Wave Finite Element Method (WFEM) framework, and the results demonstrate the significant potential of this approach in investigating the wave propagation characteristics of complex micro-sized periodic structures.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2022)
Article
Mathematics, Applied
S. Slimani, M. Farhloul, I. Medarhri, K. Najib, A. Zine
Summary: This paper introduces a mixed formulation for seawater intrusion phenomenon in confined aquifers. By writing the system into a matrix form and introducing a new variable sigma, the flux tensor of the primal variable u, the well-posedness of the continuous problem and its mixed finite element approximation are analyzed. Optimal error estimates in L-2-norm for both u and its associated flux sigma are also provided.
NUMERICAL ALGORITHMS
(2022)
Article
Physics, Multidisciplinary
Adel Tayeb, Makrem Arfaoui, Abdelmalek Zine, Mohamed Ichchou, Adel Hamdi, Jalel Ben Abdallah
Summary: This paper presents an implementation method for a viscohyperelastic model and validates its accuracy through various tests. The implemented model can be applied to engineering and biomechanical applications dealing with hyperviscoelastic models.
EUROPEAN PHYSICAL JOURNAL PLUS
(2022)
Article
Chemistry, Multidisciplinary
Barbara Zaparoli Cunha, Abdel-Malek Zine, Mohamed Ichchou, Christophe Droz, Stephane Foulard
Summary: This paper investigates the modelling of surrogate models for sound transmission loss (STL) in the vibroacoustic domain using four machine learning approaches. Feature engineering and feature importance are utilized to improve accuracy and interpretability. Results show that neural network surrogates with physics-guided features outperform other ML models in different STL models.
APPLIED SCIENCES-BASEL
(2022)
Article
Engineering, Mechanical
Bo Yang, Mohamed Ichchou, Abdelmalek Zine, Christophe Droz
Summary: In this paper, a three-dimensional modeling of micro-sized structures is introduced using the second strain gradient theory. The constitutive relation is deduced and the weak formulations are calculated. The free wave propagation characteristics, dispersion relations, and forced responses of micro-sized structures are analyzed. The wave diffusion including reflection and transmission coefficients is illustrated through coupling conditions. The proposed approach shows significant potential for investigating the wave propagation and diffusion characteristics of micro-sized structures.
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2023)
Article
Mechanics
Xuefeng Li, Mohamed Ichchou, Pascal Fossat, Abdelmalek Zine, Noureddine Bouhaddi
Summary: This paper presents a novel method for characterizing wave propagation in complex composite structures using the Algebraic K-space Identification technique in the Cartesian coordinate system. The method has been experimentally applied to study the wave propagation phenomena in various complex composite structures and has been compared with other inverse methods to assess its reliability.
COMPOSITE STRUCTURES
(2023)
Proceedings Paper
Computer Science, Artificial Intelligence
Shiwei Li, Mohsen Ardabilian, Abdelmalek Zine
Summary: Skin diagnosis, particularly concerning conditions like melanoma and jaundice, has shifted towards non-invasive methods such as diffuse reflectance for detecting inner skin information. With the advancement of machine learning techniques, non-invasive methods like neural networks have shown improved accuracy and speed in analyzing skin pigments. The use of inverse mapping neural networks has significantly accelerated computational time.
VISAPP: PROCEEDINGS OF THE 16TH INTERNATIONAL JOINT CONFERENCE ON COMPUTER VISION, IMAGING AND COMPUTER GRAPHICS THEORY AND APPLICATIONS - VOL. 4: VISAPP
(2021)
Proceedings Paper
Acoustics
Z. Liu, M. Ardabilian, A. Zine, M. Ichchou
PROCEEDINGS OF INTERNATIONAL CONFERENCE ON NOISE AND VIBRATION ENGINEERING (ISMA2020) / INTERNATIONAL CONFERENCE ON UNCERTAINTY IN STRUCTURAL DYNAMICS (USD2020)
(2020)
Article
Engineering, Mechanical
Weizhen You, Alexandre Saidi, Abdel-malek Zine, Mohamed Ichchou
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)
