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Open source tool for Micro-CT aided meso-scale modeling and meshing of complex textile composite structures 用于复杂纺织复合材料结构的微计算机断层扫描辅助中尺度建模和网格划分的开源工具
IF 8.3 1区 材料科学 Q1 MATERIALS SCIENCE, COMPOSITES Pub Date : 2024-11-05 DOI: 10.1016/j.compscitech.2024.110940
Bin Yang , Yuwei Feng , Cédric Béguin , Philippe Causse , Jihui Wang
Volumetric image-based modeling of textile reinforcements and composites is favored over ideal geometric modeling because of its ability to represent complex structures in sufficient detail. Although several approaches were devised, there is still a scarcity of dedicated tools capable of effectively transferring pertinent information from images to high-fidelity models. This work presents the open source project, PolyTex, a Python-based object-oriented application that establishes a streamlined and reproducible workflow for such tasks. Dual kriging serves as the foundational theory for the parametric approach developed to represent, simplify, and approximate the morphology and topology of fiber tows. The code takes two types of input, either an explicit representation of tow geometry using point clouds or implicit representations, such as image masks representing fiber tows separately with grayscale values. Tailored APIs allow for smooth integration between PolyTex’s modeling capabilities and the simulation environments offered by OpenFOAM and Abaqus. Case studies on virtual testing of textile permeability were presented to demonstrate this capability. The modular and object-oriented design makes PolyTex a highly reusable and extensible tool that allows users to create a customized pipeline.
与理想的几何建模相比,基于体积图像的纺织加固材料和复合材料建模更受青睐,因为它能够充分展现复杂结构的细节。尽管已经设计出了多种方法,但能够有效地将相关信息从图像转移到高保真模型的专用工具仍然十分匮乏。本作品介绍了开源项目 PolyTex,这是一个基于 Python 的面向对象应用程序,它为此类任务建立了一个简化且可重复的工作流程。双克里金法是参数方法的基础理论,用于表示、简化和近似纤维束的形态和拓扑结构。代码接受两种类型的输入,一种是使用点云对纤维束几何形状进行显式表示,另一种是隐式表示,如用灰度值分别表示纤维束的图像掩膜。定制的应用程序接口(API)允许将 PolyTex 的建模功能与 OpenFOAM 和 Abaqus 提供的仿真环境顺利集成。为展示这一功能,演示了纺织品透气性虚拟测试的案例研究。模块化和面向对象的设计使 PolyTex 成为一种高度可重用和可扩展的工具,允许用户创建自定义管道。
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引用次数: 0
Ultra-high strength and flame retardant carbon aerogel composites with efficient electromagnetic interference shielding and superior thermal insulation via nano-repairing route 通过纳米修复途径实现具有高效电磁干扰屏蔽和优异隔热性能的超高强度阻燃碳气凝胶复合材料
IF 8.3 1区 材料科学 Q1 MATERIALS SCIENCE, COMPOSITES Pub Date : 2024-11-05 DOI: 10.1016/j.compscitech.2024.110949
Wei Wang , Chong Ren , Jiaxin Zheng , He Huang , Can Wu , Xiangyu Jin , Changqing Hong , Xinghong Zhang
Carbon aerogel composites (CAs) have received numerous attention for protection of aircraft due to their unique properties. However, the shrinkage mismatch between rigid fibers and carbon sources during carbonization dramatically weakens the performance of CAs, and no significant breakthroughs have been made. We propose a vacuum impregnation assisted nano-repairing (VINR) strategy to fabricate crack-free carbon fiber reinforced carbon aerogel (Cf/CA) composites with high strength, electromagnetic interference shielding and thermal insulation. The cross-confined, overlapping nano-CA particles greatly limits the shrinkage of the carbon source, conferring excellent mechanical properties to Cf/CA, and its compressive strength and modulus reaches 3.93 MPa and 69.96 MPa in XY direction and 2.03 MPa and 40.67 MPa in Z direction, respectively, at 5 % strain. In addition, Cf/CA exhibits significant thermal insulation (0.054 W/(m·K) at 25 °C under air condition) and superior electromagnetic interference shielding properties (EMI SE is ∼48.52 dB at a thickness of ∼2 mm). Herein, the structurally optimized Cf/CA provides a promising solution for multi-effect protection for critical electronic devices of aircraft in special service environments.
碳气凝胶复合材料(CA)因其独特的性能在飞机保护方面受到广泛关注。然而,碳化过程中刚性纤维与碳源之间的收缩不匹配极大地削弱了 CA 的性能,目前尚未取得重大突破。我们提出了一种真空浸渍辅助纳米修补(VINR)策略,用于制造具有高强度、电磁干扰屏蔽和隔热性能的无裂纹碳纤维增强碳气凝胶(Cf/CA)复合材料。在应变为 5% 时,Cf/CA 在 XY 方向的抗压强度和模量分别达到 3.93 兆帕和 69.96 兆帕,在 Z 方向的抗压强度和模量分别达到 2.03 兆帕和 40.67 兆帕。此外,Cf/CA 还具有显著的隔热性能(空气条件下 25 °C 时为 0.054 W/(m-K))和优异的电磁干扰屏蔽性能(厚度为 2 mm 时 EMI SE 为 48.52 dB)。因此,结构优化的 Cf/CA 为特殊服务环境下飞机关键电子设备的多效应保护提供了一种可行的解决方案。
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引用次数: 0
Bioinspired ultra-fine hybrid nanocoating for improving strength and damage tolerance of composite fan blades in flexible manufacturing 生物启发超精细混合纳米涂层用于提高柔性制造中复合材料风扇叶片的强度和耐损伤性
IF 8.3 1区 材料科学 Q1 MATERIALS SCIENCE, COMPOSITES Pub Date : 2024-11-04 DOI: 10.1016/j.compscitech.2024.110956
Xianhe Cheng , Qigang Han , Yuzhang Huang , Mingdi Shi , Hexuan Shi , Mengxue Ji , Chuncai Yang
The ultrafine mineral bridges/bio-polymer hybrid structure inspired by nacreous is applied to the interface structure design of composite, aiming to address the high brittleness and low damage tolerance problems of carbon fiber composite fan blades (CFCFB). Herein, we present a simple and efficient approach, called the "cationic copolymer-mono micelle-mediated" method, to translate the nacre-inspired structure for developing micelles/ZnO hybrid nanocoating. The hybrid nanocoating was demonstrated to have remarkable characteristics such as ultrafine ZnO sizes, monodispersity, uniformity, and core-shell structure (diameters: ≈45 nm). Additionally, the coating process is simple, solvent-free, and seamlessly integrates with scalable carbon fiber manufacturing. Based on the nacre-inspired interface structure, the CFCFB exhibits high interlaminar strength (99.3 MPa), high stiffness (79 GPa), and high toughness (41.2 MPa m1/2). This study provides a blueprint for bioinspired ultrafine nanostructure design in composites and inspires advanced manufacturing strategies for other promising engineering materials.
将受珍珠质启发的超细矿物桥/生物聚合物混合结构应用于复合材料的界面结构设计,旨在解决碳纤维复合材料风扇叶片(CFCFB)的高脆性和低损伤耐受性问题。在此,我们提出了一种简单高效的方法,即 "阳离子共聚物-单胶束介导 "法,将珍珠质启发结构转化为胶束/氧化锌混合纳米涂层的开发。结果表明,这种混合纳米涂层具有超细氧化锌尺寸、单分散性、均匀性和核-壳结构(直径:≈45 nm)等显著特点。此外,该涂层工艺简单、无溶剂,可与可扩展的碳纤维制造工艺无缝集成。基于珍珠光泽启发的界面结构,CFCFB 表现出高层间强度(99.3 兆帕)、高刚度(79 千兆帕)和高韧性(41.2 兆帕 m1/2)。这项研究为复合材料中的生物启发超精细纳米结构设计提供了蓝图,并为其他有前途的工程材料的先进制造策略提供了灵感。
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引用次数: 0
Recyclable and highly thermally conductive nanocomposite with binary thermally conductive networks constructed from boron nitride nanoribbons and nanosheets 由氮化硼纳米带和纳米片构建的具有二元导热网络的可回收高导热纳米复合材料
IF 8.3 1区 材料科学 Q1 MATERIALS SCIENCE, COMPOSITES Pub Date : 2024-11-04 DOI: 10.1016/j.compscitech.2024.110954
Liyuan Guo , Lei Feng , Caiyue Huang , Qiang Song , Peng Wei , Dongfang Xu , Mengdan Hou , Haojie Song
Technological advances have accelerated the development of high-performance insulation-based Thermal Interface Materials (TIMs), leading to increased generation of electronic waste. A significant challenge is the development of recyclable TIMs with superior thermal conductivity. Hemiaminal dynamic covalent network (HDCN) polymers are considered as an ideal matrix material for recyclable TIMs due to their high degradability at low pH (pH < 2). In this work, binary thermally conductive paths of hexagonal boron nitride nanoribbons (BNNRs) and boron nitride nanosheets (BNNSs) are introduced into the HDCN to improve the thermal conductivity of HDCN without sacrificing its electrically insulating properties. The functional BNNSs (f-BNNSs) are attached onto the surfaces of BNNRs to achieve the homogeneous distribution of nanosheets within the HDCN. Benefiting from the binary thermally conductive paths, an excellent in-plane thermal conductivity of 3.12 W m−1K−1 for BNNS-BNNR/HDCN nanocomposite is achieved at a BN loading of 14 wt% (containing 2 wt% BNNRs and 12 wt% f-BNNS), increased by 1299 % comparing to the pure HDCN polymer, as well as superior to those reported for polymer composites with similar loading of BNNRs or BNNSs. Additionally, the nanocomposite demonstrated efficient recyclability of BNNSs and BNNRs hybrid fillers in an acidic environment (pH < 2) at 25 °C with a recycling efficiency of 82 %. Notably, the nanocomposite exhibited noteworthy electrical insulation properties. This study demonstrates the potential of BNNS-BNNR/HDCN as a recyclable TIMs and provides a new idea for the future research and development of recyclable high performance TIMs.
技术进步加速了高性能绝缘热界面材料(TIM)的发展,导致电子废物的产生量增加。开发具有优异导热性能的可回收 TIM 是一项重大挑战。半膜动态共价网络(HDCN)聚合物在低 pH 值(pH 值为 2)下具有高降解性,因此被认为是可回收 TIM 的理想基体材料。在这项工作中,六方氮化硼纳米带(BNNRs)和氮化硼纳米片(BNNSs)的二元导热路径被引入到 HDCN 中,以提高 HDCN 的热导率,同时不牺牲其电绝缘特性。功能性 BNNSs(f-BNNSs)附着在 BNNRs 表面,以实现纳米片在 HDCN 中的均匀分布。得益于二元导热路径,BNNS-BNNR/HDCN 纳米复合材料在 BN 含量为 14 wt%(含 2 wt% BNNRs 和 12 wt% f-BNNS)时实现了 3.12 W m-1K-1 的优异面内导热率,与纯 HDCN 聚合物相比提高了 1299%,也优于已报道的具有类似 BNNRs 或 BNNSs 含量的聚合物复合材料。此外,该纳米复合材料还证明了 BNNSs 和 BNNRs 混合填料在 25 °C 的酸性环境(pH 值为 2)中的高效可回收性,回收效率高达 82%。值得注意的是,该纳米复合材料还具有显著的电绝缘性能。这项研究证明了 BNNS-BNNR/HDCN 作为可回收 TIMs 的潜力,并为未来研究和开发可回收的高性能 TIMs 提供了新思路。
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引用次数: 0
Room-temperature ionic liquid electrolytes for carbon fiber anodes in structural batteries 用于结构电池中碳纤维阳极的室温离子液体电解质
IF 8.3 1区 材料科学 Q1 MATERIALS SCIENCE, COMPOSITES Pub Date : 2024-11-03 DOI: 10.1016/j.compscitech.2024.110952
Lakshmi Surag Singavarapu , Paul Gilmore , Jun Wei Yap , Yehia Khalifa , Umesh Gandhi , Timothy S. Arthur , Jay Sayre , Jung-Hyun Kim
Structural batteries require thermally stable electrolytes paired with carbon fibers (CFs), which offer advantages of lightweight, high mechanical strength, and good electrical conductivity. This work evaluated various room-temperature ionic-liquids (RTILs) as compatible electrolytes for CF anodes and LiFePO4 (LFP) cathodes on CFs. This LFP/CF full-cell design eliminates Cu and Al current-collectors, potentially enhancing gravimetric energy and reducing costs. Among various RTILs, LiTFSI in N-propyl-N-methylpyrrolidinium (PYR13) – bis(fluorosulfonyl)imide (FSI) offered promising LFP/CF full-cell performances, attributed to the formation of solid electrolyte interphase (SEI) layer on the CF anode with components such as Li2Sx, Li2S–SO3, LiF, LixFy and F–SO2, identified through X-ray photoelectron spectroscopy (XPS) and scanning electron microscopy (SEM). Electrochemical impedance spectroscopy (EIS) and distribution of relaxation times (DRT) analyses further confirmed the electrochemical stability of the SEI layer on CF anodes. The LFP/CF cell delivered an initial capacity of 119 mAh/g and relatively high Coulombic efficiency when using the 1 M LiTFSI in PYR13-FSI. CF cycled in different electrolytes exhibit varying mechanical properties with up to 10.08 % loss in tensile strength, which may be related to CF surface degradation during cycling. The 1 M LiTFSI in PYR13-FSI is non-flammable, offering a significant thermal safety. This work successfully demonstrated the significant potential of 1 M LiTFSI in PYR13-FSI RTILs, which enables the use of CF as both an anode active material and cathode current collector for structural battery applications.
结构电池需要与碳纤维(CF)配对的热稳定电解质,碳纤维具有重量轻、机械强度高和导电性好等优点。这项研究评估了各种室温离子液体(RTIL)作为 CF 阳极和 CF 上磷酸铁锂(LFP)阴极的兼容电解质。这种 LFP/CF 全电池设计消除了铜和铝集流器,有可能提高重力能量并降低成本。在各种 RTIL 中,N-丙基-N-甲基吡咯烷铵(PYR13)-双(氟磺酰)亚胺(FSI)中的 LiTFSI 具有良好的 LFP/CF 全电池性能、通过 X 射线光电子能谱 (XPS) 和扫描电子显微镜 (SEM),可以确定 CF 阳极上形成了固体电解质相间层 (SEI),其中含有 Li2Sx、Li2S-SO3、LiF、LixFy 和 F-SO2 等成分。电化学阻抗光谱(EIS)和弛豫时间分布(DRT)分析进一步证实了 CF 阳极 SEI 层的电化学稳定性。在PYR13-FSI 中使用 1 M LiTFSI 时,LFP/CF 电池的初始容量为 119 mAh/g,库仑效率相对较高。在不同电解质中循环使用的 CF 显示出不同的机械性能,拉伸强度损失高达 10.08%,这可能与循环过程中 CF 表面降解有关。PYR13-FSI中的1 M LiTFSI是不可燃的,具有显著的热安全性。这项研究成功证明了PYR13-FSI RTIL 中 1 M LiTFSI 的巨大潜力,这使得 CF 既可用作结构电池应用的阳极活性材料,也可用作阴极集流器。
{"title":"Room-temperature ionic liquid electrolytes for carbon fiber anodes in structural batteries","authors":"Lakshmi Surag Singavarapu ,&nbsp;Paul Gilmore ,&nbsp;Jun Wei Yap ,&nbsp;Yehia Khalifa ,&nbsp;Umesh Gandhi ,&nbsp;Timothy S. Arthur ,&nbsp;Jay Sayre ,&nbsp;Jung-Hyun Kim","doi":"10.1016/j.compscitech.2024.110952","DOIUrl":"10.1016/j.compscitech.2024.110952","url":null,"abstract":"<div><div>Structural batteries require thermally stable electrolytes paired with carbon fibers (CFs), which offer advantages of lightweight, high mechanical strength, and good electrical conductivity. This work evaluated various room-temperature ionic-liquids (RTILs) as compatible electrolytes for CF anodes and LiFePO<sub>4</sub> (LFP) cathodes on CFs. This LFP/CF full-cell design eliminates Cu and Al current-collectors, potentially enhancing gravimetric energy and reducing costs. Among various RTILs, LiTFSI in N-propyl-N-methylpyrrolidinium (PYR13) – bis(fluorosulfonyl)imide (FSI) offered promising LFP/CF full-cell performances, attributed to the formation of solid electrolyte interphase (SEI) layer on the CF anode with components such as Li<sub>2</sub>S<sub>x</sub>, Li<sub>2</sub>S–SO<sub>3</sub>, LiF, Li<sub>x</sub>F<sub>y</sub> and F–SO<sub>2</sub>, identified through X-ray photoelectron spectroscopy (XPS) and scanning electron microscopy (SEM). Electrochemical impedance spectroscopy (EIS) and distribution of relaxation times (DRT) analyses further confirmed the electrochemical stability of the SEI layer on CF anodes. The LFP/CF cell delivered an initial capacity of 119 mAh/g and relatively high Coulombic efficiency when using the 1 M LiTFSI in PYR13-FSI. CF cycled in different electrolytes exhibit varying mechanical properties with up to 10.08 % loss in tensile strength, which may be related to CF surface degradation during cycling. The 1 M LiTFSI in PYR13-FSI is non-flammable, offering a significant thermal safety. This work successfully demonstrated the significant potential of 1 M LiTFSI in PYR13-FSI RTILs, which enables the use of CF as both an anode active material and cathode current collector for structural battery applications.</div></div>","PeriodicalId":283,"journal":{"name":"Composites Science and Technology","volume":"259 ","pages":"Article 110952"},"PeriodicalIF":8.3,"publicationDate":"2024-11-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142592776","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Three-dimensional cohesive finite element simulations coupled with machine learning to predict mechanical properties of polymer-bonded explosives 三维内聚有限元模拟与机器学习相结合,预测聚合物粘合炸药的机械特性
IF 8.3 1区 材料科学 Q1 MATERIALS SCIENCE, COMPOSITES Pub Date : 2024-11-02 DOI: 10.1016/j.compscitech.2024.110947
Daokun Lu , Bingru Zhang , Liu Liu , Haitao Zhang , Luoxia Cao , Yang Zhou
Developing multifactorial predictive models for the design of polymer-bonded explosives (PBXs) is of importance for their further application in insensitive munition fields. As a popular method, finite element simulations can provide a reliable prediction, but are laborious and expensive if considering the extensive design parameter space. In light of this challenge, we proposed a coupled strategy that includes machine learning (ML) and three-dimensional cohesive finite element simulation for effciently predicting the mechanical properties of PBXs. The strain rate, particle volume fraction, interface strength, fracture energy, and the binders are considered as the main factors of tailoring the tensile strength of PBXs. To improve the prediction performance, an augmented database of 2500 data sets utilizing GANs neural network were established and then processed to train and test six ML models. The results show the accuracy and generalizability of the low-computational-cost ML models in predicting the mechanical properties of PBX composites. The predicted values from these models are in good agreement with the experimental ones. Feature contribution analysis demonstrates that the tensile modulus and failure strain are most affected by the binders, while the tensile strength are most affected by the fracture energy. Using the above conclusions as design guidelines, we can develop the new PBX formulations according to different mechanical property requirements for their optimal use across insensitive ammunitions. This strategy can be a viable machine-learning-assisted solution to designing PBXs.
为聚合物粘结炸药(PBX)的设计开发多因素预测模型对其在非敏感弹药领域的进一步应用具有重要意义。作为一种常用方法,有限元模拟可以提供可靠的预测,但如果考虑到广泛的设计参数空间,这种方法既费力又昂贵。有鉴于此,我们提出了一种包含机器学习(ML)和三维内聚有限元模拟的耦合策略,用于有效预测 PBX 的机械性能。应变率、颗粒体积分数、界面强度、断裂能和粘合剂被视为定制 PBX 拉伸强度的主要因素。为了提高预测性能,利用 GANs 神经网络建立了一个包含 2500 个数据集的增强数据库,然后对其进行处理,以训练和测试六个 ML 模型。结果表明,低计算成本的 ML 模型在预测 PBX 复合材料机械性能方面具有准确性和通用性。这些模型的预测值与实验值十分吻合。特征贡献分析表明,拉伸模量和破坏应变受粘合剂的影响最大,而拉伸强度受断裂能的影响最大。以上述结论为设计准则,我们可以根据不同的机械性能要求开发新的 PBX 配方,使其在不敏感弹药中得到最佳应用。这种策略可以成为设计 PBX 的一种可行的机器学习辅助解决方案。
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引用次数: 0
Electrohydrodynamic effect within CFRP laminates by bipolar nsPDC electric field during the curing process 固化过程中双极 nsPDC 电场在 CFRP 层压板内产生的电流体动力效应
IF 8.3 1区 材料科学 Q1 MATERIALS SCIENCE, COMPOSITES Pub Date : 2024-11-02 DOI: 10.1016/j.compscitech.2024.110946
Jing Xiao , Shuran Li , Mengze Li , Yihan Fu , Xiaowen Song , Yinglin Ke
In this paper, a new method based on bipolar nanosecond pulsed superimposed direct current (nsPDC) electric field assisted curing technique was developed to fabricate modified fiber-reinforced composites to enhance their mechanical properties. It was found that the mode I interlaminar fracture toughness of the electric field-modified CFRP laminates reached 1014.2 MPa, which increased by 80.4 %. The average tensile strength and tensile modulus were 2180 MPa and 100780 MPa, respectively, which were 20.7 % and 3.5 % higher than the blank control group. The enhancement mechanism was explored by COMSOL simulation, curing temperature inspection, and microscopic characterization by electron microscopy. The results show that the presence of electric field and electric field force inside the laminate, which affects the flow of resin and the weak migration of fibers, enables the elimination of larger air bubbles present in the material, the reduction of resin-rich zones in the interlayer as well as the improvement of the fiber-resin wettability without significantly altering the curing temperature. The proposed simple, convenient, and environmentally friendly strategy can effectively regulate some of the deficiencies in the conventional manufacturing methods and thus is suitable for the optimal design of fiber-reinforced composites.
本文开发了一种基于双极纳秒脉冲叠加直流(nsPDC)电场辅助固化技术的新方法,用于制造改性纤维增强复合材料,以提高其机械性能。研究发现,电场改性 CFRP 层压板的模式 I 层间断裂韧性达到 1014.2 MPa,提高了 80.4%。平均拉伸强度和拉伸模量分别为 2180 兆帕和 100780 兆帕,比空白对照组分别提高了 20.7% 和 3.5%。通过 COMSOL 仿真、固化温度检测和电子显微镜的微观表征,对增强机制进行了探索。结果表明,层压板内部电场和电场力的存在会影响树脂的流动和纤维的微弱迁移,从而在不显著改变固化温度的情况下消除材料中存在的较大气泡,减少层间树脂富集区,并改善纤维与树脂的润湿性。所提出的简单、方便、环保的策略可以有效解决传统制造方法中的一些不足,因此适用于纤维增强复合材料的优化设计。
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引用次数: 0
Construction of multi-functional silicone rubber/reduced graphene oxide/multi-walled carbon nanotube composites with segregated structure by surfactant-free Pickering emulsion method 利用无表面活性剂皮克林乳液法构建具有离析结构的多功能硅橡胶/还原氧化石墨烯/多壁碳纳米管复合材料
IF 8.3 1区 材料科学 Q1 MATERIALS SCIENCE, COMPOSITES Pub Date : 2024-11-01 DOI: 10.1016/j.compscitech.2024.110950
Yimiao Wang , Hang Lu , Weiping Lian , Yuhang Sun , Zhaorui Meng , Qingfeng Zhang , Jian Cui , Shuai Zhao , Yehai Yan
Polymer composites with segregated structure (PC–S) have the advantages of low filler usage and excellent functionality. Emulsion blending combined with direct molding technology is the main method for the preparation of PC-S. However, due to the high fluidity of low-viscosity silicone rubber (SR), PC-S cannot be prepared by this technique. In addition, surfactants affect the heat resistance of the final SR composites (SRC). In order to solve the above problems, in this study, a Pickering emulsification combined with pre-crosslinking technology for SR was successfully developed by using graphene oxides (GO)/multi-walled carbon nanotubes (MWCNTs) hybrid fillers (GM) as emulsifiers, and SR/reduced GO (RGO)/MWCNTs composites with segregated structure (SSGM) were prepared. When RGO content is 4.5 wt%, MWCNTs content is 3.2 wt%, SSGM shows the highest electrical conductivity of 12.5 S/m, the highest electromagnetic interference shielding efficiency (EMI SE) of 41.4 dB, and an excellent flame retardant performance. The whole preparation process avoids the use of organic solvents and surfactants, which reduces the production cost of SSGM and the environmental pollution, and provides a feasible preparation route for the industrialized production of SSGM.
具有离析结构的聚合物复合材料(PC-S)具有填料用量少、功能优异等优点。乳液混合结合直接成型技术是制备 PC-S 的主要方法。然而,由于低粘度硅橡胶(SR)的高流动性,PC-S 无法通过这种技术制备。此外,表面活性剂还会影响最终 SR 复合材料(SRC)的耐热性。为了解决上述问题,本研究采用石墨烯氧化物(GO)/多壁碳纳米管(MWCNTs)混合填料(GM)作为乳化剂,成功开发了一种皮克林乳化结合预交联的 SR 技术,并制备了具有离析结构的 SR/ 还原 GO(RGO)/MWCNTs 复合材料(SSGM)。当 RGO 含量为 4.5 wt%、MWCNTs 含量为 3.2 wt%时,SSGM 的导电率最高,为 12.5 S/m,电磁干扰屏蔽效率(EMI SE)最高,为 41.4 dB,并且具有优异的阻燃性能。整个制备过程避免了有机溶剂和表面活性剂的使用,降低了 SSGM 的生产成本,减少了对环境的污染,为 SSGM 的工业化生产提供了一条可行的制备途径。
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引用次数: 0
Fabrication and mechanical properties of CFRP honeycomb cylinder based on the transforming from the flat honeycombs 基于扁平蜂窝转化的 CFRP 蜂窝圆筒的制造和力学性能
IF 8.3 1区 材料科学 Q1 MATERIALS SCIENCE, COMPOSITES Pub Date : 2024-10-31 DOI: 10.1016/j.compscitech.2024.110948
Zhibin Li , Pengcheng Xue , Jian Xiong
Nature has long inspired the design of high-performance structures, offering profound insights into engineering innovations through intricate biological architectures. The rational design of composite curved components is crucial for the lightweight construction of aerospace structures. In the transition from planar constructs to curved components, any mismatch in form can induce high stress, potentially leading to structural compromise or failure. Drawing inspiration from the water lily, a rational design and fabrication approach for cylindrical surface structures is proposed, transitioning from planar to curved surfaces. The adaptation of zero Poisson's ratio honeycomb to cylindrical surface is verified by experiments and simulations. The mismatch relationship between them would lead to the damage failure of the honeycomb. In view of this, the honeycomb sandwich cylinder commonly used in aerospace is fabricated by the proposed method. Theoretical predictions and experimental characterizations were conducted to analyze failure modes under axial compression. This led to the creation of a failure mechanism map for the honeycomb cylinder. Load-mass efficiency analysis revealed that face-crushing failure provides high bearing efficiency. Additionally, the effects of facesheet thickness, along with a comparison of failure modes and imperfection sensitivity between single and sandwich cylinders, were explored. The results indicate that the sandwich cylinder exhibits a higher specific load-bearing capacity and lower imperfection sensitivity compared to the single cylinder.
长期以来,大自然为高性能结构的设计提供了灵感,通过错综复杂的生物结构为工程创新提供了深刻的启示。合理设计复合曲面部件对于航空航天结构的轻质建造至关重要。在从平面结构过渡到曲面部件的过程中,任何形式上的不匹配都会引起高应力,从而可能导致结构受损或失效。从睡莲中汲取灵感,提出了一种从平面过渡到曲面的圆柱表面结构的合理设计和制造方法。实验和模拟验证了零泊松比蜂窝结构对圆柱表面的适应性。它们之间的不匹配关系会导致蜂窝的损坏失效。有鉴于此,我们采用所提出的方法制造了航空航天领域常用的蜂窝夹层圆柱体。对轴向压缩下的失效模式进行了理论预测和实验分析。由此绘制了蜂窝圆柱体的失效机理图。载荷-质量效率分析表明,面压破坏具有很高的承载效率。此外,还探讨了面片厚度的影响,并比较了单筒和夹层筒的失效模式和缺陷敏感性。结果表明,与单圆柱体相比,夹层圆柱体具有更高的特定承载能力和更低的缺陷敏感性。
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引用次数: 0
Experimental study on the influence of optimised automated fibre placement processing parameters on the impact response and residual flexural strength of AS4/APC-2 laminates 关于优化自动纤维铺放加工参数对 AS4/APC-2 层压板冲击响应和残余抗弯强度影响的实验研究
IF 8.3 1区 材料科学 Q1 MATERIALS SCIENCE, COMPOSITES Pub Date : 2024-10-30 DOI: 10.1016/j.compscitech.2024.110945
Shafaq Shafaq , Matthew J. Donough , Binayak Bhandari , Andrew W. Phillips , Nigel A. St John , B. Gangadhara Prusty
This study explores automated fibre placement (AFP) for manufacturing impact-resistant carbon fibre/PEEK (AS4/APC-2) laminates by modifying the in-situ consolidation parameters. However, manufacturing these laminates without compromising their mechanical properties is challenging owing to the synergistic effect of parameters. The results indicate that a fast deposition rate and high consolidation force are associated with improved impact resistance and a higher threshold energy for damage. Improvements in flexural strength (27.4 %) and modulus (22.6 %), are achieved in non-impacted specimens. Acoustic emission monitoring was conducted during flexural-after-impact test to correlate the internal damage with the mechanical performance of AS4/APC-2 composites. The experimental results indicated that a fast deposition rate combined with high consolidation force can withstand higher impact loads. The FAI test showed the highest residual flexural strength and stiffness under these parameters, as it effectively resisted low-velocity impact (LVI) damage. However, the slight trade-off observed in post-impact strength suggested the presence of resin-rich areas, which may affect the damage tolerance of the laminates.
本研究通过修改原位固结参数,探索了制造抗冲击碳纤维/PEEK(AS4/APC-2)层压板的自动纤维铺放(AFP)技术。然而,由于各种参数的协同作用,要在不影响其机械性能的情况下制造这些层压板具有挑战性。结果表明,快速沉积率和高固结力与抗冲击性的改善和更高的破坏阈值能量有关。非撞击试样的抗弯强度(27.4%)和模量(22.6%)均有所提高。在挠曲-冲击后试验期间进行了声发射监测,以将内部损伤与 AS4/APC-2 复合材料的机械性能联系起来。实验结果表明,快速沉积与高固结力相结合可承受更大的冲击载荷。在这些参数下,FAI 试验显示出最高的残余抗弯强度和刚度,因为它能有效抵抗低速冲击(LVI)损伤。然而,在冲击后强度方面观察到的轻微折衷表明存在富含树脂的区域,这可能会影响层压板的损伤耐受性。
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Composites Science and Technology
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