Article
Materials Science, Composites
Dinesh Babu Venkatesan, Arumugam Vellayaraj
Summary: This research investigates the effect of different adhesive reinforcement phases on the strength and resistance to delamination of repaired glass/epoxy curved samples. The findings show that chopped glass fiber HP G/C patch-repaired samples have a higher strength recovery compared to damage area removed samples.
POLYMER COMPOSITES
(2023)
Article
Materials Science, Composites
Irene Bavasso, Jacopo Tirillo, Luca Lampani, Fabrizio Sarasini
Summary: Multifunctional carbon fiber reinforced polymer (CFRP) laminates were manufactured by inter-leaving electrospun veils decorated with ZnO nanorods (NRs) (CFRP_NY_ZnO). The delamination resistance of CFRP_NY_ZnO was compared with those of CFRP and CFRP_NY laminates under dynamic and quasi-static loading conditions. Results showed that ZnO NRs enhanced delamination resistance at 5.0 J due to additional energy consuming mechanisms, but promoted rapid failure propagation at 7.5 J. Under quasi-static condition, ZnO NRs increased flexural strength, modulus, and prevented stiffness losses even after impacts.
COMPOSITES COMMUNICATIONS
(2023)
Article
Mechanics
Yousong Xue, Bohong Gu, Baozhong Sun
Summary: This study investigates the effect of the direction of direct current on the electro-thermal damage of carbon fiber/epoxy plain woven laminates. It is found that the through-thickness current reduces the composite flexural performance and induces electro-thermal damage, while the longitudinal current does not have such effects.
COMPOSITE STRUCTURES
(2022)
Article
Mechanics
Tingyang Wu, Guangming Zhou, Deng'an Cai, Fuliang Zhou, Li Cai
Summary: This study investigated the delamination properties of deicing composite curved beams under internal heating through experimental and numerical analysis. The results showed that internal heating led to a 36% decrease in failure load and significant changes in delamination position.
COMPOSITE STRUCTURES
(2021)
Article
Materials Science, Composites
Yongxi He, Yiqun Zhang, Jiacheng Zhang, Naigang Hu, Jinzhu Zhou, Hong Bao, Wenzhong Zhao
Summary: In this study, an incremental consolidation method was proposed to actively inhibit fiber waviness in prepreg-based composite components. By applying a series of tiny step pressures continuously, plies were triggered to slide and consolidate layer by layer, reducing in-plane tension significantly. The proposed method successfully inhibited fiber waviness defects, increasing the failure load and curved beam strength of the component while increasing elastic displacement.
POLYMER COMPOSITES
(2023)
Article
Mechanics
Honglei Xie, Wanjin Li, Hai Fang, Shijiang Zhang, Zhixin Yang, Yuan Fang, Feng Yu
Summary: This study fabricated curved sandwich beams (CSBs) and conducted experiments to investigate their flexural behaviors. It was found that the usage of PET foam in CSBs can prevent core shearing failure and decrease load-displacement response. The results also showed that decreasing curvature led to a decrease in the ultimate load-bearing capacity and stiffness of the CSBs.
COMPOSITE STRUCTURES
(2024)
Article
Engineering, Manufacturing
Erik Horberg, Malin Akermo, Stefan Hallstrom
Summary: Moisture has a significant impact on the shape distortion of curved thermoset composite laminates, and needs to be carefully controlled and considered during experiments. By analyzing the experimental results, a relationship between the bracket angle, specimen thickness, and moisture content has been established.
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
(2021)
Article
Engineering, Manufacturing
Boming Zhang, Armanj D. Hasanyan, David Kellermann, Garth Pearce
Summary: This paper develops an improved framework using micropolar theory to predict the strain response of laminate free edges with heterogeneous plies. It addresses the oversimplification made in past studies by treating heterogeneous plies the same as orthotropic homogeneous plies. The micropolar theory is validated through comparison with classical theories, addressing important discrepancies and establishing experimentally measurable predictions for future experiments.
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
(2023)
Article
Mechanics
Hasan Murat Tanarslan, Caglar Yalcinkaya, Ninel Alver, Cihan Karademir
Summary: The study investigated the effectiveness of using UHPFRC plates or strips for shear strengthening, with test results showing a significant increase in shear strength and a behavior shift towards flexural behavior. It was also determined that the application of UHPFRC in strip form can greatly increase load-bearing capacity.
COMPOSITE STRUCTURES
(2021)
Article
Engineering, Civil
Tingyang Wu, Bing Zhang, Mudan Chen, Deng'an Cai, Guangming Zhou
Summary: This study investigates the flexural properties and damage evolution of electrothermal deicing composites through experimental and numerical modeling methods. Specimens were manufactured using autoclave curing and spray metal multi-layer deposition technology. Experimental results and numerical simulations show good agreement in terms of damage distribution.
THIN-WALLED STRUCTURES
(2022)
Article
Mechanics
Qisen Chen, Yaoyao Ye, Shimeng Qian, Qiang Xu, Weiwei Qu, Xiaowen Song, Yinglin Ke
Summary: This study proposes a geometric reconstruction approach and a mechanical model to study the effects of manufactured gaps on curved laminates. Experimental results confirmed the impact of gap defects on the bending strength and failure pattern of curved laminates.
COMPOSITE STRUCTURES
(2024)
Article
Mechanics
Haixiao Hu, Dongfeng Cao, Zihe Cao, Shuxin Li
Summary: This paper investigates the influence of wrinkles on the failure behavior of curved composite laminates through experimental testing and numerical simulations. It is found that wrinkles trigger premature delamination and significantly reduce the strength of the specimens. The impact of wrinkles on failure behavior is mainly attributed to local stress concentrations.
COMPOSITE STRUCTURES
(2021)
Article
Engineering, Civil
Armagan Karamanli, Nuttawit Wattanasakulpong, M. Lezgy-Nazargah, Thuc P. Vo
Summary: The flexural, free vibration, and buckling responses of 2D-FG curved beams with various shear deformation theories are studied using a finite element model. Material properties are varied with power-law distribution in both length and thickness directions. A two-node beam element with C1 continuity requirement is employed for solving the problems. Various problems including isotropic, 1D- and 2D-FG curved beams are analyzed and the results are validated with those available in the literature. Comprehensive parameter examinations are conducted to investigate the effects of gradation indexes, open angles, end conditions, and aspect ratios on the structural behaviors of 2D-FG curved beams.
Article
Materials Science, Multidisciplinary
Haoyu Wang, Mingguang Yang, Haoran Chen, Luling An, Xianfeng Wang, Chen Liu, Fan Ye
Summary: Firstly, three groups of fiber curve laminates with different numbers of layers and different fiber curve angles were designed and prepared. A cantilever plate free vibration test was used to analyze the influence of the fiber curve angle on the vibration free attenuation characteristics of the laminates. The results showed that when the angle change of the fiber curve was +/-, the loss factor of the laminates reached the maximum value, and the vibration damping performance of the laminates was the best. Secondly, modal tests were carried out and the influence of the fiber curve angle on the natural frequency of the laminate was explored. The results showed that the natural frequencies of the laminates first increased and then decreased with an increase in the fiber curve angle. The first three natural frequencies of the laminates reached the maximum value when the fiber curve angle was +/- or +/-.
MATERIALS RESEARCH EXPRESS
(2023)
Article
Engineering, Multidisciplinary
Yury Solyaev, Arseniy Babaytsev
Summary: The results show that in GLARE samples with a small span-to-thickness ratio, there is a concentration of plastic shear strain inside the GFRP layers, affecting the load-bearing capacity and interlaminar shear strength. By conducting full-field DIC analysis on samples with longitudinal and transverse fiber orientations, the theoretical predictions are validated.
COMPOSITES PART B-ENGINEERING
(2021)
Article
Mathematics, Interdisciplinary Applications
Sergey Dolgov, Robert Scheichl
SIAM-ASA JOURNAL ON UNCERTAINTY QUANTIFICATION
(2019)
Article
Mathematics, Applied
A. D. Gilbert, I. G. Graham, F. Y. Kuo, R. Scheichl, I. H. Sloan
NUMERISCHE MATHEMATIK
(2019)
Article
Computer Science, Interdisciplinary Applications
R. Butler, T. Dodwell, A. Reinarz, A. Sandhu, R. Scheichl, L. Seelinger
COMPUTER PHYSICS COMMUNICATIONS
(2020)
Article
Chemistry, Physical
Hideki Kobayashi, Paul B. Rohrbach, Robert Scheichl, Nigel B. Wilding, Robert L. Jack
JOURNAL OF CHEMICAL PHYSICS
(2019)
Article
Computer Science, Theory & Methods
Sergey Dolgov, Karim Anaya-Izquierdo, Colin Fox, Robert Scheichl
STATISTICS AND COMPUTING
(2020)
Article
Mathematics, Applied
Ivan G. Graham, Matthew J. Parkinson, Robert Scheichl
Summary: The study presents an analysis of multilevel Monte Carlo (MLMC) techniques for uncertainty quantification in the radiative transport equation with heterogeneous random fields as coefficients. Error analysis for the deterministic case is provided, along with error estimates explicit in coefficients and applicable to low regularity and jumps. The expected cost for computing a typical quantity of interest remains consistent with single sample estimates, and the multilevel version of the approach shows significant improvement over Monte Carlo in certain scenarios.
IMA JOURNAL OF NUMERICAL ANALYSIS
(2021)
Article
Computer Science, Interdisciplinary Applications
J. Lang, R. Scheichl, D. Silvester
JOURNAL OF COMPUTATIONAL PHYSICS
(2020)
Article
Engineering, Mechanical
T. J. Dodwell, S. Kynaston, R. Butler, R. T. Haftka, Nam H. Kim, R. Scheichl
Summary: By adopting the MLMC framework, this research demonstrates that only a small number of expensive fine-scale computations are needed to accurately estimate the failure statistics of a composite structure. The results show significant computational gains with the introduction of the MLMC method and selective refinement for efficiently calculating structural failure probabilities.
PROBABILISTIC ENGINEERING MECHANICS
(2021)
Article
Multidisciplinary Sciences
T. J. Dodwell, L. R. Fleming, C. Buchanan, P. Kyvelou, G. Detommaso, P. D. Gosling, R. Scheichl, W. S. Kendall, L. Gardner, M. A. Girolami, C. J. Oates
Summary: The emergence of additive manufacture for metallic material enables components of near arbitrary complexity to be produced, but these components exhibit greater levels of variation in geometric and mechanical properties compared to standard components, posing a barrier to potential users. Researchers demonstrate that intrinsic variation in AM steel can be well described by a generative statistical model, allowing for prediction of design quality before manufacture by combining probabilistic mechanics and uncertainty quantification.
PROCEEDINGS OF THE ROYAL SOCIETY A-MATHEMATICAL PHYSICAL AND ENGINEERING SCIENCES
(2021)
Article
Mathematics, Applied
Chupeng Ma, Robert Scheichl, Tim Dodwell
Summary: This paper studies the generalized finite element method (GFEM) for solving second order elliptic equations with rough coefficients. New optimal local approximation spaces for GFEMs are proposed, and the advantages of these new spaces are discussed. An efficient and easy-to-implement technique for generating the discrete A-harmonic spaces is also proposed, and numerical experiments are conducted to confirm the effectiveness of the new method.
SIAM JOURNAL ON NUMERICAL ANALYSIS
(2022)
Article
Physics, Fluids & Plasmas
Hideki Kobayashi, Paul B. Rohrbach, Robert Scheichl, Nigel B. Wilding, Robert L. Jack
Summary: The study used a two-level simulation method to analyze the critical point associated with demixing of binary hard sphere mixtures. The results showed a strong and unexpected dependence of the critical point on the size ratio between large and small particles, which is related to three-body effective interactions and the geometry of the underlying hard-sphere packings.
Proceedings Paper
Computer Science, Artificial Intelligence
Jakob Kruse, Gianluca Detommaso, Ullrich Koethe, Robert Scheichl
Summary: This work introduces a method for invertible neural architectures using coupling block designs, achieving an efficiently invertible block with dense, triangular Jacobian by recursively subdividing and coupling within resulting subsets. Through a hierarchical architecture, the method allows sampling from joint distributions and corresponding posteriors using a single invertible network, demonstrating its effectiveness in density estimation and Bayesian inference on various data sets.
THIRTY-FIFTH AAAI CONFERENCE ON ARTIFICIAL INTELLIGENCE, THIRTY-THIRD CONFERENCE ON INNOVATIVE APPLICATIONS OF ARTIFICIAL INTELLIGENCE AND THE ELEVENTH SYMPOSIUM ON EDUCATIONAL ADVANCES IN ARTIFICIAL INTELLIGENCE
(2021)
Article
Astronomy & Astrophysics
Karl Jansen, Eike H. Muller, Robert Scheichl
Article
Mathematics, Applied
Markus Bachmayr, Ivan G. Graham, Van Kien Nguyen, Robert Scheichl
SIAM JOURNAL ON NUMERICAL ANALYSIS
(2020)
Article
Mathematics, Applied
T. J. Dodwell, C. Ketelsen, R. Scheichl, A. L. Teckentrup
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)
