Article
Chemistry, Analytical
Baochun Xu, Jiacai Huang, Yachun Jie
Summary: This paper presents a method for directly extracting damage-induced acoustic emission (AE) from impact AE, to be used for health monitoring of plate structures. By analyzing various characteristics of the Lamb wave mode, the damage-induced AE wave packets can be effectively extracted and verified.
Article
Mechanics
Minghua Wang, Mengyue He, Zhihong Liang, Di Wu, Yue Wang, Xinlin Qing, Yishou Wang
Summary: This paper investigates the fatigue behavior of CFRP open-hole laminated beams with different stacking sequences under pure tensile loading using acoustic emission (AE) and digital image correlation (DIC), and analyzes the influence of different damage mechanisms on the ultimate fatigue failure. The stiffness degradation behavior of CFRP structures is characterized by AE hit rate and absolute AE energy, and the strain field distribution characteristics during the damage failure are discussed in association with DIC. By combining PCA and the Kmeans++ algorithm, the damage modes of two types of layered CFRP laminated beams are identified and their contribution to the ultimate fatigue failure is analyzed using CDI values.
COMPOSITE STRUCTURES
(2023)
Article
Engineering, Multidisciplinary
Yanfeng Lang, Zhibo Yang, Detong Kong, Wei Zhang, Xuefeng Chen
Summary: The MUSIC algorithm, commonly used in direction of arrival estimation, has been popular in structural health monitoring for its high resolution and independence from baseline. However, in guided-wave-based SHM, the dispersion effect causes phase distortion. Xu et al. presented a focusing MUSIC algorithm that uses time reversal technique to eliminate dispersion. By modifying the steering vector, the forward-propagation-free focusing MUSIC algorithm eliminates the need for forward propagation and steering vector traversal.
STRUCTURAL HEALTH MONITORING-AN INTERNATIONAL JOURNAL
(2023)
Article
Engineering, Multidisciplinary
Stylianos Livadiotis, Konstantinos Sitaropoulos, Arvin Ebrahimkhanlou, Salvatore Salamone
Summary: This paper proposes a new method for monitoring corrosion in steel pipelines using the acoustic emission technique. It takes into account the helical propagation of corrosion-related AE events and suggests a qualitative corrosion monitoring approach. Experimental results demonstrate the potential of helical Lamb-type AE for corrosion monitoring.
STRUCTURAL HEALTH MONITORING-AN INTERNATIONAL JOURNAL
(2023)
Article
Acoustics
Erlend Magnus Viggen, Havard Kjellmo Arnestad
Summary: This article investigates an enhanced model for sound radiation near and below coincidence. Unlike the classical model, this model fully respects conservation of energy by balancing the radiated power with power lost from the guided wave underlying the vibration. The model successfully validates against exact solutions for leaky A0 Lamb waves around coincidence.
JOURNAL OF SOUND AND VIBRATION
(2023)
Article
Construction & Building Technology
Haoran Li, Yan Hu, Laibo Li, Dongyu Xu
Summary: Monitoring the acoustic emission phenomenon of concrete materials after loading using acoustic emission sensors is a hot topic in civil engineering. The use of tungsten powder and epoxy resin mixture as the backing layer of the sensors was investigated. The increase in tungsten powder content in the backing layer resulted in a decrease in acoustic reflection coefficient, an increase in acoustic impedance, and an improvement in resolution of the acoustic emission sensor. A sensor with optimal performance was obtained when the tungsten powder content reached 50% of the total mass of the backing layer.
CASE STUDIES IN CONSTRUCTION MATERIALS
(2023)
Article
Chemistry, Analytical
Sarjoon Alkhateeb, Filippo Riccioli, Felipe Leon Morales, Lotfollah Pahlavan
Summary: This paper presents research on the feasibility assessment of detecting and localizing corrosion damage under marine growth using acoustic emission (AE) technology. The experiments conducted on carbon steel plates covered with artificially fabricated marine growth showed that corrosion-induced ultrasound signals can be detected with satisfactory signal-to-noise ratio using non-contact AE sensors. A localization algorithm for corrosion-induced ultrasound signals was successfully implemented.
Article
Engineering, Multidisciplinary
Alvaro Gonzalez-Jimenez, Luca Lomazzi, Rafael Junges, Marco Giglio, Andrea Manes, Francesco Cadini
Summary: Damage diagnosis of thin-walled structures has been successfully performed through tomography and machine learning-driven methods, with good performance in processing Lamb waves. However, traditional approaches do not work well for composites due to their anisotropy and complex damage mechanisms. To overcome these limitations, this work proposes a CNN-based algorithm that localizes damage by processing Lamb waves without feature extraction, and it outperforms traditional methods.
STRUCTURAL HEALTH MONITORING-AN INTERNATIONAL JOURNAL
(2023)
Article
Engineering, Mechanical
Benjamin Boll, Lennart Dorendorf, Peter Oppermann, Erik Willmann, Bodo Fiedler, Bernd-Christian Renner, Marcus Rutner, Robert Horst Meissner
Summary: The vibroacoustic modulation (VAM) is a nonlinear ultrasonic testing method that utilizes the modulation of a high-frequency/low-amplitude probe wave with a low-frequency/high-amplitude pumping vibration, resulting in high sensitivities to damages in the structure. A synthetic generation of the VAM signal using probe measurements acquired at different stress levels is proposed, reducing the sensing requirements and decoupling VAM from the need for a constant recurrent frequency and amplitude of the natural vibration. This method opens the possibility of applying VAM to assess the structural health of complex structures.
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2023)
Article
Construction & Building Technology
Xiangbo Xu, Zuquan Jin, Yong Yu, Ning Li
Summary: This paper uses digital image correlation (DIC) and acoustic emission (AE) techniques to investigate the damage mode of ultra-high performance concrete (UHPC) during loading process. The results show that DIC and AE can identify internal damage sources and detect surface cracks in UHPC. The addition of steel fibers increases the strain of cracking point in UHPC exposed to steam curing. Furthermore, b-value analysis provides critical values for UHPC damage, and reference values for warning threshold and warning time are proposed.
JOURNAL OF BUILDING ENGINEERING
(2023)
Article
Chemistry, Analytical
Viktor Fairuschin, Felix Brand, Alexander Backer, Klaus Stefan Drese
Summary: Nondestructive evaluation of elastic properties is critical for monitoring thin structures. Recent research shows that guided acoustic waves' dispersive nature can accurately determine their elastic properties. This study presents a new approach using piezoelectric transducers to measure group velocities ratio, achieving high accuracy with a simple setup for industrial use.
Article
Engineering, Multidisciplinary
Weijia Shi, Jiaxin Li, Bo Zhao, Jiubin Tan
Summary: This article proposes a baseline-free stress monitoring methodology. It is demonstrated theoretically and experimentally that the effect of external stress on the phase velocity of Lamb waves varies with the propagation direction in isotropic materials. The time difference in Lamb wave propagation in specific directions can be used to calculate the existing stress. The proposed methodology eliminates the need for referential ideal echo data, which is the basis for stress measurements in existing methods. Experimental verification shows a maximum absolute error of 4.7 MPa in stress measurement within an external stress range of 20-100 MPa. It is believed that the proposed methodology is a promising alternative for structural quality assessment and safety assurance.
STRUCTURAL HEALTH MONITORING-AN INTERNATIONAL JOURNAL
(2023)
Article
Materials Science, Characterization & Testing
Zenghua Liu, Zhaojing Lu, Wenshuo Jiang, Yanhong Guo, Cunfu He
Summary: An improved periodic permanent magnet electromagnetic acoustic transducer (PPM EMAT) is proposed for defect detection of a U-shaped boom. The improved PPM EMAT has a wider acoustic field distribution range and more uniform energy distribution. Simulation and experimental results demonstrate that the improved PPM EMAT has superior frequency response characteristics and acoustic field directivity, making it suitable for detecting large and complex structures.
NONDESTRUCTIVE TESTING AND EVALUATION
(2023)
Review
Construction & Building Technology
Els Verstrynge, Giuseppe Lacidogna, Federico Accornero, Adrienn Tomor
Summary: Acoustic emission monitoring is widely used in materials research and site monitoring, but faces challenges in masonry structures. Its non-invasive nature and high sensitivity provide opportunities for locating damage and assessing deterioration rates in historical masonry structures.
CONSTRUCTION AND BUILDING MATERIALS
(2021)
Article
Engineering, Multidisciplinary
K. Saravanakumar, C. Suresh Kumar, V Arumugam
Summary: The study demonstrated that changing the interply fiber orientation can significantly enhance the interlaminar fracture toughness and delamination resistance. The diversion of crack path along the fiber orientation offers more resistance to crack propagation, leading to an increase in fracture toughness. Furthermore, the calculation of sentry function enables the evaluation of delamination resistance.
STRUCTURAL HEALTH MONITORING-AN INTERNATIONAL JOURNAL
(2021)
Article
Mechanics
Abdullah Maleki, Milad Saeedifar, Mehdi Ahmadi Najafabadi, Dimitrios Zarouchas
ENGINEERING FRACTURE MECHANICS
(2019)
Article
Engineering, Multidisciplinary
C. Suresh Kumar, Mohamad Fotouhi, Milad Saeedifar, V. Arumugam
COMPOSITES PART B-ENGINEERING
(2019)
Article
Engineering, Chemical
Mohamed Nasr Saleh, Milad Saeedifar, Dimitrios Zarouchas, Sofia Teixeira De Freitas
INTERNATIONAL JOURNAL OF ADHESION AND ADHESIVES
(2020)
Article
Engineering, Manufacturing
Milad Saeedifar, Mohamed Nasr Saleh, Hassan M. El-Dessouky, Sofia Teixeira De Freitas, Dimitrios Zarouchas
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
(2020)
Review
Engineering, Multidisciplinary
Milad Saeedifar, Dimitrios Zarouchas
COMPOSITES PART B-ENGINEERING
(2020)
Article
Engineering, Mechanical
Pankaj R. Jaiswal, R. Iyer Kumar, M. Saeedifar, M. N. Saleh, Geert Luyckx, W. De Waele
Summary: The study investigates the mechanical behavior and failure mechanisms of adhesive joints in naval superstructures through experimental research. Various instrumentation techniques were used to monitor the deformation behavior and damage evolution of a full-scale multi-material joint. The results showed adhesive, cohesive, and skin failure modes, with acceptable correlation found between different sensor signals.
PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART C-JOURNAL OF MECHANICAL ENGINEERING SCIENCE
(2021)
Article
Mechanics
Mohamad Fotouhi, Meisam Jalalvand, Milad Saeedifar, Bill Xiao, Michael R. Wisnom
COMPOSITE STRUCTURES
(2020)
Article
Mechanics
Reza Mohammadi, Mehdi Ahmadi Najafabadi, Hamed Saghafi, Milad Saeedifar, Dimitrios Zarouchas
Summary: The study focused on characterizing fatigue damage features in carbon/epoxy laminates under mode-II loading conditions. SEM was used to identify damage features on fracture surfaces, and a linear relationship between striation space and strain energy release rate range was established. The AE method was employed to characterize damage features, showing that higher AE energy indicates larger and rougher cusps and striation features.
ENGINEERING FRACTURE MECHANICS
(2021)
Article
Engineering, Multidisciplinary
Milad Saeedifar, Mohamed Nasr Saleh, Peter Nijhuis, Sofia Teixeira de Freitas, Dimitrios Zarouchas
Summary: This study explored the use of acoustic emission technique for damage assessment in aeronautical bi-material structures. The results showed that acoustic emission accurately detected and tracked damage evolution, and identified damage initiation earlier than digital image correlation.
STRUCTURAL HEALTH MONITORING-AN INTERNATIONAL JOURNAL
(2022)
Article
Materials Science, Composites
Milad Saeedifar, Hamed Saghafi, Reza Mohammadi, Dimitrios Zarouchas
Summary: The study evaluated the toughening capability of electrospun PA66 nanofibers for carbon/epoxy composite laminates under mode II loading conditions at elevated temperatures. The results showed that the toughness of the nanomodified specimens decreased at higher temperatures due to decreased crack propagation through the nano-layer, a shift from cohesive to adhesive failure as the dominant damage mechanism, and severe plastic deformation of nanofibers at high temperatures.
COMPOSITES SCIENCE AND TECHNOLOGY
(2021)
Article
Materials Science, Composites
Milad Saeedifar, Hossein Hosseini Toudeshky
Summary: This paper investigates the effect of interlaminar and intralaminar damage mechanisms on the quasi-static indentation strength of composite laminates. Two types of carbon/epoxy laminates were fabricated and subjected to quasi-static out-of-plane indentation loading. The results showed that the dominant damage mechanism in one specimen was a transverse matrix crack, while another specimen exhibited both transverse matrix crack and delamination. The ultimate indentation strength of the latter specimen was 1.6 times higher than the former, despite similar initial damage loads. Acoustic emission signals and finite element modeling were used to study the damage state and mechanisms, which were consistent with the experimental observations.
APPLIED COMPOSITE MATERIALS
(2023)
Article
Materials Science, Composites
Milad Saeedifar, Mohamed Nasr Saleh
Summary: This article investigates the effect of alternating the sequence of variable-energy repeated low-velocity impact on the residual strength of carbon fiber reinforced polymer (CFRP) laminates. The results showed that the residual strength of the specimens was not significantly affected by alternating the impacts sequence. However, the impact-induced damage in HML configuration was activated much earlier than MLH, and the damage induced in LMH configuration was activated later than both.
POLYMER COMPOSITES
(2023)
Article
Engineering, Civil
Milad Saeedifar, Mohamed Nasr Saleh, Anouar Krairi, Sofia Teixeira de Freitas, Dimitrios Zarouchas
Summary: This study proposes a comprehensive integrity assessment approach for a full-scale adhesively-bonded bi-material joint for maritime applications. By integrating Acoustic Emission (AE), Fiber Optic Sensor (FOS), and Digital Image Correlation (DIC) techniques, the damage initiation, severity, critical regions, and different damage mechanisms of the joint can be successfully detected and assessed.
THIN-WALLED STRUCTURES
(2023)
Article
Materials Science, Composites
Milad Saeedifar
Summary: This study quantifies impact damage in laminated composites using acoustic emission and verifies the results using finite element method. The results show that the acoustic emission method is applicable for identification and quantification of impact damage in composite structures.
POLYMER COMPOSITES
(2023)
Article
Engineering, Mechanical
Mahdy Ahangar, Milad Saeedifar
Summary: This study investigates the effect of dielectric-barrier discharge (DBD) plasma treatment of glass fibers on the mode II interlaminar fracture toughness of glass/epoxy composite laminates. The results show that the plasma treatment significantly improves the toughness of the specimens, but does not increase the chemical bonding strength between the fibers and resin. Scanning electron microscopy reveals that the plasma treatment enhances the adhesion of the fibers to epoxy.
THEORETICAL AND APPLIED FRACTURE MECHANICS
(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)
