Article
Materials Science, Multidisciplinary
B. Daum, R. Rolfes
Summary: The paper applies micropolar continuum theory to predict the microbuckling strength of long fiber reinforced composites and extend simulations into the collapse regime. Compared to fine scale micromechanical representation, this approach offers superior numerical efficiency. Micropolar homogenization introduces additional rotational degrees of freedom to address the issue of fiber curvature not being considered.
MECHANICS OF MATERIALS
(2022)
Article
Materials Science, Composites
Chunwang He, Jingran Ge, Xiaofei Cao, Yanfei Chen, Haosen Chen, Daining Fang
Summary: Manufacturing uncertainties in composites, such as carbon fiber deviations and voids, can impact mechanical properties. Although experiments have been conducted, quantitative characterization of fiber radius and shape deviations, and matrix void content, remain a challenge. A computational micromechanics study was conducted to understand the effects of manufacturing uncertainties on the mechanical behavior of UD composites under different loading conditions. The methodology involved establishing constitutive laws for constituents, modeling RVEs with deviations based on observations, and predicting stress-strain curves and failure modes.
COMPOSITES SCIENCE AND TECHNOLOGY
(2022)
Article
Materials Science, Composites
Zixuan Chen, Tianyu Yu, Yun-Hae Kim, Zetian Yang, Yan Li, Tao Yu
Summary: This study aims to investigate the mechanical properties of basalt fiber reinforced polymers (BFRPs) with the incorporation of different structured nanoclays, and to improve their interfacial bonding through experimental methods. The results show that a flattened nanoclay structure is more effective for enhancing the modulus, and the inclusion of different structured nanoclays also improves the interlaminar strength and toughness of BFRPs.
COMPOSITES SCIENCE AND TECHNOLOGY
(2021)
Article
Engineering, Manufacturing
Xiaodong Wang, Zhidong Guan, Na Liu, Mi Zhang, Zengshan Li, Qingchun Meng, Shanyi Du
Summary: A novel micromechanics-based failure criterion for longitudinal compressive failure of fiber reinforced composites is proposed, taking into account two failure modes, fiber bending failure and inter-fiber shear failure, and judging them based on micro-scale stress. The validity of the failure criterion in predicting strength and failure mode is proved through micro-scale finite element models and existing experimental results. The key effect parameters of longitudinal compressive strength are also discussed. This proposed failure criterion can be applied in composite structures simulation and composite materials performance design.
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
(2022)
Article
Materials Science, Composites
Benedikt Daum, Gerrit Gottlieb, Nabeel Safdar, Martin Brod, Jan-Hendrik Ohlendorf, Raimund Rolfes
Summary: The compressive strength of fiber reinforced composites is often limited by microbuckling, which is influenced by local misalignments and flaws in the material. Weakest-link Weibull theory is commonly used to predict strength loss in individual plies, but misalignments in laminates may be mitigated in a way that contradicts weakest-link assumptions. Additionally, adding extra layers to a laminate can result in a strength increase that outweighs the strength loss predicted by Weakest-link Weibull theory.
JOURNAL OF COMPOSITE MATERIALS
(2022)
Article
Mechanics
Chunwang He, Jingran Ge, Yanfei Chen, Yanping Lian
Summary: Virtual testing is a powerful tool for characterizing the mechanical behavior of materials, and this paper proposes a FE-SCA concurrent multiscale framework to overcome the challenges of virtual testing for composite structures. The results show that the proposed framework can accurately predict the mechanical behavior of woven structures and has higher efficiency compared to traditional methods. Due to its efficiency and predictive ability, the FE-SCA concurrent multiscale virtual testing has the potential to facilitate composite design and structure optimization.
COMPOSITE STRUCTURES
(2023)
Article
Engineering, Manufacturing
Junfeng Ding, Li Zhang, Zhixing Li, Tao Zheng, Kai Huang, Licheng Guo
Summary: A new elastic-plastic damage model is proposed in this paper to simulate the plastic deformation and progressive failure process of fiber reinforced polymer composites under 3D stress conditions. The effectiveness and objectivity of the proposed material model are demonstrated by a series of test cases.
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
(2023)
Article
Chemistry, Physical
Yishu Yan, Junbo Xu, Huajian Zhu, Yinxiang Xu, Min Wang, Bingyin Wang, Chao Yang
Summary: This study used molecular dynamics simulations and theoretical calculations to show that the presence of grafted functional groups in carbon fiber/polyimide composites can greatly enhance the interfacial shear strength, which linearly increases with the number of grafted groups. It also revealed that the mechanism of interface enhancement is the synergistic effect of non-bond interactions and surface roughness.
APPLIED SURFACE SCIENCE
(2021)
Article
Engineering, Manufacturing
Fernando Rojas-Sanchez, Anthony M. Waas
Summary: Experimental results from DVC analysis show that damage initiation of a single-edge notched cross-ply [90/0/90] laminate loaded in tension occurs through delamination of one of the interfaces near the tip of the notch at approximately 24% of the ultimate load. These results provide valuable insights into the progressive failure behavior of fiber reinforced composite laminates, aiding in the development and validation of failure analysis models.
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
(2023)
Article
Materials Science, Composites
Erick S. S. Guerra, Bruna L. Silva, Jose D. D. Melo, Gerhard Kalinka, Ana P. C. Barbosa
Summary: This study investigates the influence of thermoplastic particles on the fiber-matrix interfacial properties of a glass fiber reinforced epoxy matrix composite, and demonstrates the self-healing ability of the thermoplastic modified epoxy.
COMPOSITES SCIENCE AND TECHNOLOGY
(2023)
Article
Materials Science, Composites
C. Breite, A. Melnikov, A. Turon, A. B. de Morais, F. Otero, F. Mesquita, J. Costa, J. A. Mayugo, J. M. Guerrero, L. Gorbatikh, L. N. McCartney, M. Hajikazemi, P. P. Camanho, R. P. Tavares, S. Lomov, S. Pimenta, W. Van Paepegem, Y. Swolfs
Summary: This paper presents a blind benchmark of seven different models applied to two virtual materials for prediction of longitudinal tensile failure of unidirectional composites. Capturing the localization of stress concentrations was vital in predicting the effect of matrix stiffness and strength on composite failure strain and strength as well as fiber break and cluster development. The discussions provide insight into how model assumptions are linked to the differences in predictions.
COMPOSITES SCIENCE AND TECHNOLOGY
(2021)
Article
Mechanics
Paulo Teixeira Goncalves, Albertino Arteiro, Nuno Rocha, Fermin Otero
Summary: This work presents a novel formulation of a 3D smeared crack model for unidirectional fiber-reinforced polymer composites based on a stress invariant approach for transverse yielding and failure initiation. The performance of the model is evaluated using monotonic and non-monotonic damage evolution, verified with single element tests and compared with experimental results.
INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES
(2024)
Article
Materials Science, Composites
Rui He, Longfei Cheng, Yidi Gao, Hao Cui, Yulong Li
Summary: This paper investigates the effect of in-plane shear stress on the fiber kinking compressive fracture toughness of laminates using compact compression specimens with off-axis fibers. The results show that in-plane shear stress increases the values of the R-curves, leading to an increase in energy dissipation. Microscopic morphology reveals the increasing splitting of fiber bundles and subsequent fiber compression failure as the off-axis angle of the fibers increases.
COMPOSITES SCIENCE AND TECHNOLOGY
(2023)
Article
Polymer Science
Alexander Poellinger, Thomas Koch, Stefan Krenn, Fabian Wilde, Domonkos Tolnai, Bernhard Plank, Sarah Heupl, Johannes Bernardi, Karin Whitmore, Marc Langela, Sandra Seichter, Michael Schoebel
Summary: Efficient transport of hydrogen is crucial for the widespread adoption of renewable energy. Reciprocating piston compressors with high strength non-lubricated sealing solutions are key technologies to meet the demands for gas purity and high-pressure gradients in hydrogen applications.
Article
Engineering, Manufacturing
Guansong He, Peng Wang, Yu Dai, Yinshuang Sun, Jianhu Zhang, Zhijian Yang
Summary: This study successfully achieved high efficiency thermal conductivity enhancement by selectively depositing Ag nanoparticles to repair the structural defects of carbon nanofillers. The thermal stress distribution in PBX cylinder facing complicated thermal changes was evaluated, shedding new light on enhancement of thermal conductivity of polymer composites.
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
(2021)
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)