Article
Engineering, Civil
Shahrokh Shams, A. R. Torabi, Mahdi Fatehi Narab, M. A. Amiri Atashgah
Summary: This study investigates the free vibration analysis of a laminated composite beam with a through-width delamination. The beam is modeled as a cantilevered structure based on the Euler-Bernoulli equations and composite material is modeled as a lamina fiber-reinforced. Governing equations are extracted using Hamilton's principle with both geometric and material couplings. Results show that the Dynamic Stiffness Matrix (DSM) method is more accurate than the finite element method (FEM) when comparing the two methods in the same cases. The study also examines the effects of various parameters on the natural frequencies and mode shapes of the beam.
THIN-WALLED STRUCTURES
(2021)
Article
Mechanics
Amin Ekhtiyari, Mahmood M. Shokrieh
Summary: The study evaluates the influence of local separation rate on stress distribution near the crack tip and practical traction-separation laws for double-cantilever beam specimens under different loading rates. The bridging laws indicate that maximum bridging traction decreases with increasing separation rate. The proposed model, implemented in ABAQUS, demonstrates good agreement between finite element and experimental results, verifying its reliability and accuracy in accounting for rate effects in presence of large-scale fiber bridging.
COMPOSITE STRUCTURES
(2022)
Article
Engineering, Manufacturing
Wei-Tsen Lu, Zhenjia Gao, Hari K. Adluru, Kevin H. Hoos, Waruna P. Seneviratne, David H. Mollenhauer, Endel V. Iarve
Summary: This study applies the regularized eXtended Finite Element Method (XFEM) framework to the discrete modeling of damage evolution and interaction in laminated composites. The crack density limit is increased for a given mesh size. The study also introduces the Residual Strength Tracking methodology and an automatic cycle jump step selection algorithm. The predictions show excellent agreement with experimental data.
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
(2022)
Article
Engineering, Multidisciplinary
Mohit Pundir, Guillaume Anciaux
Summary: The evolution of crack surfaces in materials is closely related to the self-contact between them, with developed contact forces playing a significant role in stress mitigation and stress transfer. A hybrid cohesive-contact approach is proposed to model fracture processes with cohesive elements while enforcing contact and friction constraints through a penalty-based method, overcoming limitations of traditional approaches for large relative displacements. The new approach provides a reliable and physically based numerical model for studying crack propagation along rough surfaces.
INTERNATIONAL JOURNAL FOR NUMERICAL METHODS IN ENGINEERING
(2021)
Article
Mechanics
Penghai Deng, Quansheng Liu, Xing Huang, Qi Liu, Hao Ma, Weiwei Li
Summary: The study proposed a method to measure the normal contact stiffness and found that an alpha value of 0.1448 is optimal for simulating rock crack propagation under different conditions. Proper selection of the alpha value can improve the reliability of FDEM numerical simulation results.
ENGINEERING FRACTURE MECHANICS
(2021)
Article
Mechanics
Chen-Lin Liu, D. M. Li, Xin Cheng
Summary: In this study, the potential of utilizing intralaminar stiffness tailoring to enhance delamination resistance is explored. The effect of different fiber layouts and the size of the central cutout on the delamination performance of perforated composite plates is investigated. The results demonstrate that intralaminar stiffness tailoring can significantly improve the delamination resistance of composite materials.
COMPOSITE STRUCTURES
(2023)
Article
Engineering, Manufacturing
Tharan Gordon, Michael R. Wisnom, Byung Chul Kim
Summary: Thickness tapering is a common strategy for efficient and lightweight composite structures, but it can introduce delamination sites. This study investigated the use of ply scarfing method to improve the compressive failure stress of tapered laminates made from thick unidirectional non-crimp fabrics. The results showed that ply scarfing suppressed delamination and increased the failure stress by 60%.
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
(2024)
Article
Mechanics
Weiling Liu, Puhui Chen
Summary: The study introduces a novel method for accurately determining interface strength in simulating Mode I delamination, and for predicting FPZ length more accurately when using coarse meshes. Additionally, it reveals that the constant cohesive law is more suitable for simulating delamination with coarse meshes than the bi-linear cohesive law. This method is applicable to various structure thicknesses and material properties in composite materials.
ENGINEERING FRACTURE MECHANICS
(2021)
Article
Materials Science, Composites
Jagan Selvaraj, Luiz F. Kawashita, Mehdi Yasaee, Gordon Kalwak, Stephen R. Hallett
Summary: A novel cohesive element formulation is proposed for modelling composite delamination, offering increased stability and requiring fewer elements. This new formulation combines nodal rotations and multiple integration points to improve the accuracy of delamination propagation simulation.
COMPOSITES SCIENCE AND TECHNOLOGY
(2021)
Article
Engineering, Civil
Hussein Dalfi, Anwer Al-Obaidi, Abdalameer Tariq, Hussein Razzaq, Roham Rafiee
Summary: This study investigates the effect of fiber angle on the tensile load-bearing performance and damage failure characteristics of glass composite laminates through experimental, analytical, and numerical methods. The results show that increasing the fiber offset angle can optimize the performance and damage characteristics of the laminates.
FRONTIERS OF STRUCTURAL AND CIVIL ENGINEERING
(2023)
Article
Polymer Science
Mariana Domnica Stanciu, Silviu Marian Nastac, Ionut Tesula
Summary: This paper focuses on the sensitivity analysis of the effects of delamination of fiberglass-reinforced polymer composites in wind turbine blade structures using finite element analysis. The research reveals that delamination affects the stress states of the blade, with maximum stress values depending on the orientation of the composite layers.
Article
Chemistry, Physical
Cheng Angelo Yan, Riccardo Vescovini
Summary: The development of accurate and efficient numerical methods is crucial for composite structures analysis and design, especially in the presence of variable stiffness configurations. This paper presents a novel FE approach called ps-FEM which can efficiently perform global/local analysis through p-refinement and s-refinement. The combination of p- and s-refinements enables the method to achieve excellent accuracy-to-cost ratios in VS composite shell analysis.
Article
Materials Science, Composites
Rajendra Kumar Munian, D. Roy Mahapatra
Summary: The study simulated the propagation of ultrasonic guided waves in laminated composites with matrix crack mixed delamination to better detect early damage. By analyzing the correlation between signal characteristics and defect parameters using suitable frequencies and a super-resolution quantitative scheme, the study provided new understanding towards defect size estimation and indicative measure of matrix crack delamination.
JOURNAL OF COMPOSITE MATERIALS
(2023)
Article
Mechanics
K. B. Yilmaz, B. Sabuncuoglu, B. Yildirim
Summary: This study calculates stresses due to frictional sliding contact between a rigid cylinder and laminated glass fiber composites, and presents a novel analytical formulation to solve stress and displacement fields. An augmented finite element algorithm is developed to verify the results, showing the success of the new analytical formulation, which can be beneficial for structural design under severe contact conditions.
Article
Materials Science, Multidisciplinary
Vu An Le, Navid Zobeiry, Emre Erkmen, Sardar Malek
Summary: This study investigated the buckling response of viscoelastic composite laminates under compression, focusing on the ply wrinkling behavior in the early stage of thermoset composite manufacturing. Through numerical modeling and comparison with experimental data, it was found that the compressive stiffness of uncured prepregs is mainly influenced by the resin modulus, and the waviness of fibers plays a role in the buckling behavior. Conducting more compression tests on uncured and partially cured prepregs is suggested for further validation of the proposed modeling approach.
MECHANICS OF MATERIALS
(2021)
Article
Acoustics
Yafeng Chen, Jie Zhu, Zhongqing Su
Summary: This study designs four new types of second-order phononic topological insulators (SPTIs) with customized dual-bandgap, allowing for dual-band corner states and potential applications in multiband communications and manipulation of elastic waves with enhanced robustness.
JOURNAL OF SOUND AND VIBRATION
(2023)
Article
Engineering, Multidisciplinary
Lingquan Tang, Yehai Li, Qiao Bao, Weiwei Hu, Qiang Wang, Zhongqing Su, Dong Yue
Summary: This study proposes a machine learning-based method with a sparse sensor array to achieve quantitative classification of the damage location and severity on a composite plate.
Article
Engineering, Mechanical
Yi He, Kai Wang, Lei Xu, Hoon Sohn, Zhongqing Su
Summary: A laser-ultrasonics imaging approach is developed to accurately characterize submillimeter defects in thick waveguides using denoising and defect imaging techniques.
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2023)
Article
Instruments & Instrumentation
Lei Xu, Yiyin Su, Jianwei Yang, Zhongqing Su
Summary: Researchers have developed a theoretical model to analyze the interaction between wideband laser-generated Rayleigh waves and surface cracks, and have validated the model through simulations and experiments.
SMART MATERIALS AND STRUCTURES
(2023)
Article
Instruments & Instrumentation
Wen Qiu, Lei Xu, Yaozhong Liao, Qiao Bao, Qiang Wang, Zhongqing Su
Summary: This study proposes a sparse, triangle-shaped sensor array to identify, orient, and assess the degree of structural damage in composite constructions. The damage-scattered Lamb waves are recorded by the sparse sensor array and then fed into the SVM classification method. The location and severity of the damage can be determined by training the SVM model.
SMART MATERIALS AND STRUCTURES
(2023)
Article
Instruments & Instrumentation
Fei Du, Shiwei Wu, Jiexin Weng, Xuan Zhang, Chao Xu, Zhongqing Su
Summary: This paper proposes a few-shot EMI monitoring method for bolt looseness detection under temperature variation environment. The approach features a conversion method of the impedance signal to image based on the Hank matrix. Experimental results show that the proposed method can significantly improve the monitoring accuracy of bolt loosening with few samples.
SMART MATERIALS AND STRUCTURES
(2023)
Article
Engineering, Mechanical
Wei Xu, Mincong Ji, Yisu Xi, Hao Xu, Maosen Cao, Zhongqing Su, Wieslaw Ostachowicz
Summary: This study proposes a method based on radial pseudo-force (RPF) to characterize damage in cylinders. By identifying the RPF, the occurrence, location, and approximate plane size of damage can be graphically represented. A novel method for reconstructing RPFs via mono-laser scanning is also proposed.
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2023)
Article
Physics, Multidisciplinary
Zhongming Gu, He Gao, Haoran Xue, Di Wang, Jiamin Guo, Zhongqing Su, Baile Zhang, Jie Zhu
Summary: The interaction between band topology and disorder can lead to interesting phenomena, such as the topological Anderson insulator. This study investigates the effect of non-Hermitian disorders on topological systems using a one-dimensional acoustic lattice. It reveals the evolution of non-Hermitian disorder-induced topological phase transitions experimentally, showing immunity of topological modes induced by non-Hermitian disorders to both weak Hermitian and non-Hermitian disorders. These findings open up possibilities for research on disordered non-Hermitian systems for novel wave manipulation.
SCIENCE CHINA-PHYSICS MECHANICS & ASTRONOMY
(2023)
Article
Instruments & Instrumentation
Jianjian Zhu, Zhongqing Su, Zhibin Han, Zifeng Lan, Qingqing Wang, Mabel Mei-po Ho
Summary: The study proposes a transfer learning-based ensemble approach called SMART to address the limitations of poor generalization and extendibility in machine learning and deep learning methods. By conducting experiments on curing monitoring of polymeric composites, the effectiveness of SMART is validated and it is found to outperform conventional machine learning algorithms.
SMART MATERIALS AND STRUCTURES
(2023)
Article
Instruments & Instrumentation
Jianjian Zhu, Zhongqing Su, Qingqing Wang, Yinghong Yu, Jinshan Wen, Zhibin Han
Summary: Continuous and accurate monitoring of curing degree is crucial for ensuring the structural integrity of composites. A novel approach utilizing transfer learning and imaging processing is proposed, which outperforms conventional machine learning algorithms in terms of generalization and extendibility.
SMART MATERIALS AND STRUCTURES
(2023)
Article
Engineering, Mechanical
Yafeng Chen, Xueyun Wen, Zhongming Gu, Jie Zhu, Zhongqing Su
Summary: In this study, a topology optimization method is used to customize and optimize multiband second-order sonic topological insulators (SSTIs). Multiple dual-band SSTIs and a three-band SSTI with customizable bandgaps for hosting corner states are successfully constructed and experimentally validated. This research opens up a route for customizing high-performance multiband SSTIs, and the designed multiband SSTIs have the potential for designing robust multiband acoustic devices.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2023)
Article
Materials Science, Multidisciplinary
Haiyan Fan, He Gao, Tuo Liu, Shuowei An, Xianghong Kong, Guoqiang Xu, Jie Zhu, Cheng-Wei Qiu, Zhongqing Su
Summary: Non-Hermiticity in acoustic crystals leads to exotic topological phenomena and allows for manipulation of topological modes. Our work demonstrates an acoustic quadrupole topological insulator, offering a reconfigurable and versatile approach to manipulating topological phenomena.
Article
Materials Science, Composites
Anchalee Duongthipthewa, Yuan Tian, Onjira Duongthipthewa, Zhongqing Su, Limin Zhou
Summary: This study investigates the influence of lightning strike protection systems and parameters on thermal damage and mechanical response of CFRP composites, and proposes novel carbon-based materials for enhanced protection.
COMPOSITES COMMUNICATIONS
(2023)
Article
Computer Science, Artificial Intelligence
Jianjian Zhu, Zhongqing Su, Qingqing Wang, Zifeng Lan, Frankie Siu-fai Chan, Zhibin Han, Zhaokun Wang, Sidney Wing-fai Wong, Andy Chi-fung Ngan
Summary: This study proposes an intelligent approach combining transfer learning and gradient-boosting decision trees to investigate the effects of FDM printing parameters on surface quality. Experimental results validate the effectiveness of this approach and provide valuable insights.
EXPERT SYSTEMS WITH APPLICATIONS
(2024)
Article
Acoustics
Menglong Liu, Wenyan Zhang, Xiao Chen, Lun Li, Kai Wang, Hong Wang, Fangsen Cui, Zhongqing Su
Summary: In this study, an open-source dispersion calculator for guided wave propagation is developed based on the semi-analytical finite element (SAFE) method. It can calculate guided waves in both isotropic and anisotropic materials, providing various characteristics and aiding researchers and engineers in understanding and utilizing guided waves.
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)
