Article
Engineering, Environmental
Wanting Wei, Pengfei Zhang, Feng Cao, Junhao Liu, Kun Qian, Diankun Pan, Yongtao Yao, Wenbing Li
Summary: This study proposes a method for preparing ultrathin, flexible, and conductive polymer fiber composite (CPFC) with excellent electromagnetic interference shielding effectiveness (EMI SE) and shape memory effect. The CPFC is fabricated by combining ethylene-vinyl acetate copolymer (EVA) fiber membrane, polydopamine (PDA) layer, and silver nanoparticles. The SMCPFC exhibits high electrical conductivity and superior EMI SE. Additionally, it demonstrates an outstanding electrothermally-driven shape memory effect.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Polymer Science
Ewa Kijenska-Gawronska, Adrian Maliszewski, Monika Bil
Summary: Fibrous shape memory scaffolds made of thermoplastic polyurethane were fabricated, and the effect of fiber diameter and alignment on crystallinity, mechanical properties, and shape memory was analyzed. The results showed that changes in fiber diameter did not significantly affect shape recovery coefficient, while longitudinal fiber alignment enhanced mechanical properties and shape recovery.
Article
Materials Science, Multidisciplinary
Wei Shen, Hongsheng Luo, Junzhao Su, Sheng Hu, Guobin Yi
Summary: Electrospun shape memory polymer mats, surface modified with polydopamine (PDA) to incorporate carbon nanotubes (CNTs), were twisted into fibers with unique hierarchically coiled structures. The twisting process greatly improved the mechanical properties of the fibers and reduced hysteresis in stretching/releasing cycles. The resulting twisted fibers exhibited enhanced resistive-type strain sensing, making them suitable for applications as light-triggered self-sensing actuators.
Article
Chemistry, Multidisciplinary
Haiyang Du, Yongtao Yao, Yang Liu, Wei Zhao
Summary: In this study, a composite strip with a two-way reversible bending behavior was created by embedding a NiTi shape memory alloy wire into a rubber/shape memory polymer (SMP) soft matrix. The elastic moduli of the SMA wire were characterized to increase by about 3 times (18.6 GPa at martensite phase and 50.1 GPa at austenite phase) from 25 degrees C to 90 degrees C. A SMA composite strip using SMP to replace the rubber matrix was fabricated, which significantly improved the load-bearing ability (16-fold) at 28 degrees C. The rubber/SMP-based SMA strip exhibited good two-way bending behaviors with a high shape deploying ratio above 80%. The application of rubber/SMP-based composite strips in a space-deployable antenna model with two-way reversible bending behavior was developed and demonstrated through a heating and cooling temperature cycle.
APPLIED SCIENCES-BASEL
(2023)
Article
Polymer Science
Guangqin Shi, Cheng Huang, Xinyu Cao, Minying Liu, Jingnan Zhang, Kun Zheng, Yongmei Ma
Summary: A triple-shape memory polymer was prepared by chemically crosslinking melting blending of ethylene-vinyl acetate copolymer (EVA) and poly(propylene carbonate) (PPC), showing excellent triple shape memory effects with shape fixing ratio and shape recovery ratio both over 90%. The key to achieving triple SME is the matching of the modulus of the two components, with the glassy PPC having a higher modulus than the semi-crystalline EVA.
Article
Polymer Science
Polina A. Kovaleva, Igor O. Pariy, Roman V. Chernozem, Mikhail Yu. Zadorozhnyy, Elizaveta S. Permyakova, Evgeniy A. Kolesnikov, Maria A. Surmeneva, Roman A. Surmenev, Fedor S. Senatov
Summary: In this study, the electrospun PLA-PCL scaffolds were extensively characterized to investigate the impact of reduced graphene oxide (rGO) content on morphology, structure, thermal behavior, and shape memory performance. The results showed that the addition of rGO led to changes in the structure and improved mechanical properties of the prepared composites. The electrospun hybrid PLA-PCL scaffolds with rGO exhibited pronounced shape memory effect, making them promising for tissue engineering applications.
EUROPEAN POLYMER JOURNAL
(2022)
Article
Polymer Science
Adrian Leones, Laura Peponi, Stefano Fiori, Marcela Lieblich
Summary: This study investigated the thermally-activated shape memory behavior of poly(lactic acid)-based electrospun fibers reinforced with different amounts of magnesium oxide nanoparticles at different temperatures. The results indicated that 1 wt% MgO nanoparticles was the best concentration for achieving excellent thermally-activated shape memory response at 45 degrees C.
Article
Chemistry, Multidisciplinary
Sam Briggs, Scott Herting, Grace Fletcher, Rachel Gruenbaum, Duncan J. Maitland
Summary: This article presents a method for fabricating shape memory electrospun polyurethane and discusses strategies to improve material properties. Such materials have potential benefits in medical applications and can be directed for specific uses based on their characteristics.
Article
Polymer Science
Xiaowei Xing, Xiaoyu Zhang, Jian Fang, Hua Zhou, Haitao Niu
Summary: This study presents a facile and scalable method to fabricate waterproof breathable membranes using electrospinning and electrospraying. The composite nanofiber membranes exhibit excellent durability, breathability, and elasticity. This research is of great significance for the preparation of waterproof and breathable membranes with balanced properties.
Article
Materials Science, Composites
Yonglin Zhang, Tianzhen Liu, Xin Lan, Yanju Liu, Jinsong Leng, Liwu Liu
Summary: This paper presents the design, fabrication, evaluation, and application of a compliant robotic grip structure based on shape memory polymer composites, demonstrating its superior performance through DMA, FEA, and experimental verification.
COMPOSITES COMMUNICATIONS
(2022)
Article
Construction & Building Technology
Yanpeng Wu, Xiaoyu Li, Qiaoyang Zhong, Faming Wang, Bin Yang
Summary: This study created a PVDF/SiO2/Ag composite nanofiber membrane with superhydrophobic and antibacterial properties using an electrospinning method. The membrane was deposited on PET fibers to create an air filter material. The results showed that the addition of nano-silver significantly improved the antibacterial performance while increasing the concentration of hydrophobic nano-SiO2 improved the hydrophobicity. The composite nanofiber membrane had a filtration efficiency of 99.94% for 0.3μm particulate matter and a drag pressure drop of 112.3 Pa, with a filtration efficiency for air microorganisms greater than 99.99%.
JOURNAL OF BUILDING ENGINEERING
(2023)
Article
Engineering, Chemical
Fang Yuan, Renfeng Yang, Bin Wang, Ying Gao, Chunquan Li, Zhiming Sun
Summary: The application potential of fine powder photocatalysts can be improved by preparing membranes for large-scale photocatalytic materials. In this study, a composite nanofiber membrane embedded with TiO2@diatomite catalyst was prepared for photocatalytic purification of formaldehyde. The prepared composite nanofiber membranes showed good photocatalytic performance under both UV light and sunlight illumination, with a degradation rate 1.03 times higher than that of the membrane prepared by Degussa P25. The introduction of natural diatomite enhanced the HCHO removal performance and improved the air and water vapor permeability.
SEPARATION AND PURIFICATION TECHNOLOGY
(2023)
Article
Materials Science, Multidisciplinary
M. Raja Pugalenthi, Konlayutt Punyawudho, M. Anbu Arasi, A. A. Shah, M. Ramesh Prabhu, M. Kouthaman, K. Velsankar, R. Gayathri
Summary: The electrospinning approach is used to fabricate dense continuous sulfonated poly (ether ether ketone) nanofiber mat, which is then impregnated with SPEEK solution to construct pore filled composite membranes for proton exchange membranes fuel cells. The suitable control of voltage, viscosity, flow rate, and collector distance is critical for obtaining a uniform dense fiber structure without bead formation. The embedded nanofibers improve the properties of the composite membranes, indicating their potential as materials for PEMFC.
Article
Materials Science, Characterization & Testing
Feng Wang, Man Jiang, Yu Pan, Yuan Lu, Wangjie Xu, Yufan Zhou
Summary: UV light responsive shape memory polyurethane (SMPU) composites were successfully fabricated by direct ink writing (DIW) 3D printing with the addition of lignin nanotube (LNT) as a UV absorbent. The composites exhibited a shape recovery rate of 99% under UV radiation and a significantly improved tensile strength compared to pristine PU. The study suggests that the direct ink writing of SMP composites holds great promise for various applications.
Article
Materials Science, Composites
Bingfei Liu, Fangfang Zhang, Rui Zhou, Yigang Sun
Summary: This study investigates the mechanical behaviors of SMPC-SMAs under different loading conditions, considering the influence of temperature changes on phase transition and discussing the thermomechanical behaviors of these composites. The results show that SMPC-SMAs display different mechanical properties than pure SMAs or SMPs, making them a promising prospect for engineering applications.
POLYMER COMPOSITES
(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)