Article
Construction & Building Technology
Changqing Wang, Wenjing Pang, Zhiming Ma, Dejiang Wang
Summary: Recycled aggregate concrete (RAC) has gained global attention for its ecological and economic significance. This study mixed steel fiber and polypropylene fiber into RAC to improve its mechanical properties and proposed an optimum design method for fiber content in fiber-reinforced recycled aggregate concrete (FRAC).
CONSTRUCTION AND BUILDING MATERIALS
(2022)
Article
Engineering, Biomedical
Hai-Chao Han
Summary: This study explored the application of nonsymmetric two fiber family constitutive models in arterial walls and investigated the effects of nonsymmetry on the deformation and stress in arteries under mechanical loads.
JOURNAL OF THE MECHANICAL BEHAVIOR OF BIOMEDICAL MATERIALS
(2022)
Article
Construction & Building Technology
Yaowen Xu, Chaojun Wan, Xuhui Liang, Hongyu Yang
Summary: This paper investigates the reinforcement effects of different fibers on alkali-activated slag (AAS) material. It demonstrates that strain-hardening and clinker-free composites can be achieved using a combination of PVA, PE, and steel fibers. The study finds that different fibers have various reinforcement effects on the matrix and points out the poor adaptability of PVA and PE fibers in high alkalinity AAS material. Furthermore, a new relationship between crack numbers and strain-stress curves is established to characterize the strain-hardening property of fiber-reinforced composites.
CASE STUDIES IN CONSTRUCTION MATERIALS
(2022)
Review
Materials Science, Multidisciplinary
Hedan Bai, Robert F. Shepherd
Summary: Robots are designed to achieve specific tasks rather than general utility, and a bottom-up approach starting with new materials could potentially lead to robots that meet the needs for autonomy and general utility across industries.
CURRENT OPINION IN SOLID STATE & MATERIALS SCIENCE
(2021)
Article
Engineering, Electrical & Electronic
Yifan Shi, Yan Mao, Xiaoqiang Xu, Jialong Xia
Summary: This article presents a flexible sensor based on fiber Bragg gratings and a spiral surrounding structure design. By using a convolutional neural network and machine learning techniques, the sensor can achieve high-precision angle recognition. Experimental results demonstrate that this sensing system can meet the application requirements of biomimetic robots and clinical surgical operations.
IEEE SENSORS JOURNAL
(2023)
Article
Construction & Building Technology
Jun Feng, Weiwei Sun, Le Chen, Bingcheng Chen, Emran Arkin, Lufei Du, Madura Pathirage
Summary: Engineered Cementitious Composites (ECC) with remarkable mechanical properties were developed using Chinese local ingredients in this study. Mechanical performance of ECC was determined through experiments and numerical simulations. Results suggest that the best tensile performance of ECC is achieved with 18mm-long polyvinyl alcohol (PVA) fiber reinforcement.
CASE STUDIES IN CONSTRUCTION MATERIALS
(2022)
Article
Mathematics, Applied
Huifeng Xi, Guicheng Zhao, O. Bruhns, Siyu Wang, Heng Xiao
Summary: This paper presents an explicit form of the elastic strain-energy function for direction-dependent large elastic strain behaviors of soft fiber-reinforced composites based on a decoupled approach. Closed-form solutions are obtained for the uniaxial tension responses in the fiber and cross-fiber directions using this form. The numerical examples provided show good agreement with experimental data for large strain responses.
APPLIED MATHEMATICS AND MECHANICS-ENGLISH EDITION
(2023)
Article
Crystallography
Chan-Jung Kim
Summary: The study compared the dynamic behavior of CFRP specimens with different carbon fiber directions using experimental modal analysis and the modal assurance criterion, finding increased similarity among specimens when the carbon fiber direction exceeded 45 degrees. Anisotropic nature was dominant in three cases from 0 degrees to 45 degrees, with the most sensitive case identified in Specimen #3.
Article
Engineering, Electrical & Electronic
Soroush Razmyar, M. Taghi Mostafavi
Summary: This study proposes a novel approach to measuring the deflection direction of a multimode fiber's tip using speckle patterns analysis and a convolutional neural network model. Experimental results demonstrate the feasibility of using speckle patterns for this purpose. The study also sheds light on the generalization capabilities of speckle patterns analysis in sensing the direction of deflection.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2021)
Article
Physics, Fluids & Plasmas
Min Yan, Wen-Hao Zhang, He Wang, K. Y. Michael Wong
Summary: We studied the behavior of bimodular continuous attractor neural networks that process sensory inputs and interact with each other. We observed that the position of bumps in each module shifts towards or away from the other module depending on the type of intermodular coupling. We also found that excitatory and inhibitory couplings encode attractive and repulsive priors, respectively, in multisensory integration.
Article
Engineering, Civil
Gao Ma, Chunxu Hou, Jiulin Bai, Bo Li, Xiaohuang Chen
Summary: This study investigated the axial compressive behavior of predamaged concrete repaired by JFRP and BFRP composites. The results showed that the compressive behavior of the repaired concrete was adversely affected by the predamage, but the repaired concrete still exhibited improved strength and deformation characteristics. The type and number of repair materials had a significant influence on the strain-strain relationship and Poisson's ratio of the concrete.
JOURNAL OF COMPOSITES FOR CONSTRUCTION
(2022)
Article
Materials Science, Composites
Engin Erbayrak
Summary: This study investigated the flexural properties of hybrid composite laminates under strain rate sensitivity, with a focus on the effect of fiber orientations. Experimental and numerical results showed a consistent trend, indicating the suitability of the Cowper-Symonds material model for predicting the flexural behavior of composite laminates under various strain rates.
JOURNAL OF COMPOSITE MATERIALS
(2021)
Article
Optics
Talat Korpinar, Zeliha Koerpinar, Gul Ugur Kaymanli
Summary: This article introduces the improvements in functionalizing optical fibers and geometric fabrics through numerous geometric applications. Optical uniform motions are designed using electromagnetic directions. The study also explores magnetic curves and their optical modeling. The results indicate the applicability of geometric explanation for the radial direction of uniformly motion in Minkowski 4-space.
Article
Chemistry, Analytical
Valerii Matveenko, Natalia Kosheleva, Grigorii Serovaev, Andrey Fedorov
Summary: This paper discusses the results of strain measuring experiments using fiber Bragg grating sensors embedded in polymer composite material, including the process of manufacturing the samples and the variant of strain calculations based on experimental data. The study also offers a numerical model for the experiment and the results of numerical simulation, providing an explanation for the absence of expected peaks in the reflected optical spectrum under certain loading conditions.
Article
Engineering, Manufacturing
Fatemeh Mashayekhi, Julien Bardon, Yao Koutsawa, Stephan Westermann, Frederic Addiego
Summary: This study aims to investigate the strain measurement of optical fiber sensors called fiber Bragg grating (FBG) sensors embedded in 3D printed polymeric structures and understand the relationship between the matrix-sensor effective strain transfer and interfacial properties. Printing and surface engineering methods were developed to facilitate the embedding of the FBG sensor into the PLA matrix, including the design of a channel and the use of solvent welding or chemical bonding to improve adhesion. The strain transfer was evaluated through cyclic tensile testing of the PLA specimen and comparing the digital image correlation (DIC) strain measurements on the surface with the FBG strain measurements in the core. The results showed that the strain transfer was primarily affected by the interfacial porosity volume fraction, which should be minimized during sensor embedding.
ADDITIVE MANUFACTURING
(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)