Composites Part B: Engineering最新文献_第8页

Cartilage regeneration achieved in photo-crosslinked hyaluronic hydrogel bioactivated by recombinant humanized collagen type III 重组人源化 III 型胶原蛋白生物激活的光交联透明质水凝胶实现软骨再生

IF 12.7 1区材料科学 Q1 ENGINEERING, MULTIDISCIPLINARY

Composites Part B: Engineering

Pub Date : 2024-10-15 DOI: 10.1016/j.compositesb.2024.111886

Yang Xu , Jing Wang , Zhanhong Liu , He Qiu , Lu Song , Shuo Liu , Yajun Tang , Lu Chen , Xing Ma , Kai Zhang , Hai Lin , Xingdong Zhang

Collagen has been extensively investigated as a bioactive material in cartilage tissue engineering. Recombinant humanized collagen type III (rhCol III) possessed excellent biocompatibility and imperative interactions with various cells shows a significant advantage as the starting material of medical devices. To investigate the bioactivation effect of rhCol III in cartilage tissue engineering, methacrylated hyaluronic acid (HA-MA) was prepared and rhCol III was further compounded to establish a photo-crosslinked composite hydrogel (HA-rhCol Ⅲ) platform to study the cartilage regeneration with chondrocytes encapsulated. The results verified that the HA-rhCol III hydrogels could be rapidly formed with stable mechanical properties using the blue light curing system. Meanwhile, the rhCol III could be effectively retained inside the composite hydrogel, which was conducive to maintain its bioactive function for a longer period. In vitro cell experiments confirmed that rhCol III improved the local microenvironment for chondrocytes, which provided abundant adhesion sites and further promoted cell migration, proliferation and differentiation. In vivo results indicated that the composite hydrogels could be conveniently applied to fulfill the cartilage defect in rabbit, and the histological and immunohistological results suggested that cartilage regeneration could be achieved with the application of HA-rhCol Ⅲ composite hydrogels. It could be concluded that the addition of rhCol III could bioactivate the hydrogel and promote the tissue regeneration, showing potential for application in tissue engineering.

胶原蛋白作为软骨组织工程中的一种生物活性材料已被广泛研究。重组人源化Ⅲ型胶原蛋白（rhColⅢ）具有良好的生物相容性，与各种细胞之间的相互作用势在必行，作为医疗器械的起始材料具有显著优势。为研究rhCol Ⅲ在软骨组织工程中的生物活化效应，研究人员制备了甲基丙烯酸化透明质酸（HA-MA），并将rhCol Ⅲ进一步复合，建立了光交联复合水凝胶（HA-rhCol Ⅲ）平台，研究其包裹软骨细胞的软骨再生作用。结果验证了利用蓝光固化系统可快速形成具有稳定力学性能的 HA-rhCol Ⅲ水凝胶。同时，rhCol III 能被有效地保留在复合水凝胶中，有利于长期保持其生物活性功能。体外细胞实验证实，rhCol III 改善了软骨细胞的局部微环境，提供了丰富的粘附位点，进一步促进了细胞的迁移、增殖和分化。体内实验结果表明，复合水凝胶可方便地用于兔软骨缺损的修复，组织学和免疫组织学结果表明，应用 HA-rhCol Ⅲ 复合水凝胶可实现软骨再生。可以得出的结论是，rhCol Ⅲ的添加可以使水凝胶生物活化，促进组织再生，在组织工程中具有应用潜力。

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引用次数: 0

Effects of electron beam and atomic oxygen irradiation on hypervelocity - Impact tested / polyimide coated carbon fiber-reinforced plates 电子束和原子氧辐照对超高速-冲击试验/聚酰亚胺涂层碳纤维增强板的影响

IF 12.7 1区材料科学 Q1 ENGINEERING, MULTIDISCIPLINARY

Composites Part B: Engineering

Pub Date : 2024-10-13 DOI: 10.1016/j.compositesb.2024.111877

Masahiro Nishida , Daichi Kimura , Kyouko Ashida , Naomasa Furuta , Yoshiaki Iwase , Yuichi Ishida

In a low-Earth orbit, space debris orbit at approximately the first cosmic velocity. When space debris strike a spacecraft, ejecta (fragments) from the spacecraft are widely scattered. The reduction in the number of ejecta (fragments caused by impact) must also be considered when selecting spacecraft materials. The authors’ group has previously examined the size of ejecta (fragments) and reduction in the number of ejecta. In general, the mechanical properties of polymer materials and CFRP plates may be damaged by space environments, such as radiation (gamma rays and electron beams (EBs)), atomic oxygen (AO), ultraviolet rays, temperature, and thermal cycling. The authors suggested an anti-AO coating/polyimide CFRP as a material resistant to space environments. The effects of EB and AO irradiation on the fracture behavior and ejecta of anti-AO coating/polyimide CFRP were examined for hypervelocity impacts. The results of static three-point flexural tests were compared with the fracture behavior and ejecta. A two-stage light-gas gun was used for the impact tests. Spherical projectiles formed of aluminum alloy 2017-T4 with a diameter of 1.6 mm were used. Photographs of the ejecta scattered in front of each polyimide CFRP plate were captured from the side using a high-speed video camera. The number and weight of the ejecta on the front side and perforation holes were examined.

在低地球轨道上，空间碎片的轨道速度大约为宇宙第一速度。当空间碎片撞击航天器时，航天器的弹射物（碎片）会广泛散落。在选择航天器材料时，还必须考虑减少弹射物（撞击造成的碎片）的数量。作者的研究小组曾研究过抛射物（碎片）的大小和减少抛射物数量的问题。一般来说，高分子材料和 CFRP 板材的机械性能可能会受到空间环境的破坏，如辐射（伽马射线和电子束 (EB)）、原子氧 (AO)、紫外线、温度和热循环。作者建议使用抗 AO 涂层/聚酰亚胺 CFRP 作为耐太空环境的材料。在超高速撞击中，研究了 EB 和 AO 照射对抗氧化涂层/聚酰亚胺 CFRP 断裂行为和弹射物的影响。将静态三点弯曲试验的结果与断裂行为和喷出物进行了比较。冲击试验使用了两级光气枪。使用的球形弹丸由铝合金 2017-T4 制成，直径为 1.6 毫米。使用高速摄像机从侧面拍摄了散落在每块聚酰亚胺 CFRP 板前的弹丸照片。检查了正面和穿孔的弹丸数量和重量。

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引用次数: 0

Internal damage evolution of C/SiC composites in air at 1650 °C studied by in-situ synchrotron X-ray imaging 通过原位同步辐射 X 射线成像研究 1650 °C 下空气中 C/SiC 复合材料的内部损伤演化

IF 12.7 1区材料科学 Q1 ENGINEERING, MULTIDISCIPLINARY

Composites Part B: Engineering

Pub Date : 2024-10-12 DOI: 10.1016/j.compositesb.2024.111878

Li Xi , Shaoling Li , Kaiyuan Xue , Xiaochuan Cui , Bowen Wang , Ying Li , Daining Fang

Carbon fibre reinforced silicon carbide (C/SiC) ceramic matrix composites have attracted considerable attention due to their exceptional properties and extensive potential applications as high-temperature structural materials. However, due to their complex structure and manufacturing defects, C/SiC composites exhibit intricate mechanical behaviour under thermal-mechanical-oxidative coupling environments. To date, systematic studies on the internal damage evolution and failure mechanisms of C/SiC composites under high-temperature oxidative environments are lacking. In this study, a combination of synchrotron X-ray micro-computed tomography (SR-μCT) and in-situ experiments under thermal-mechanical-oxidative coupling environments at room temperature and 1650 °C in air was used to characterize the internal microstructures and damage evolution processes of C/SiC composites at different loading levels. Additionally, the 3D strain fields during in-situ loading were quantitatively analysed using the Digital Volume Correlation (DVC) method. The findings underscore the substantial impact of oxidative damage on the mechanical response of C/SiC composites, particularly concerning tensile properties and fracture modes. At room temperature, severe delamination, fibre bundle pull-out and interfacial debonding occurred internally. Whereas, under high-temperature atmospheric conditions, severe fibre oxidation reactions occurred at the specimen edges, resulting in rapid porosity escalation. Crack initiation from surface defects followed by rapid inward propagation is observed. Moreover, while the strain distribution remains relatively uniform until fracture, a pronounced concentration of strain is evident near the fracture zones at room temperature, with an even greater concentration observed at 1650 °C. Notably, the region of concentrated strain within the 3D deformation field corresponds closely to the final fracture location, as revealed by quantitative DVC analysis.

碳纤维增强碳化硅（C/SiC）陶瓷基复合材料因其优异的性能和作为高温结构材料的广泛应用潜力而备受关注。然而，由于其复杂的结构和制造缺陷，C/SiC 复合材料在热-机械-氧化耦合环境下表现出复杂的机械性能。迄今为止，还缺乏对 C/SiC 复合材料在高温氧化环境下的内部损伤演变和失效机理的系统研究。本研究结合同步辐射 X 射线显微计算机断层扫描（SR-μCT）和在室温和 1650 °C 空气中热-机械-氧化耦合环境下的原位实验，表征了不同加载水平下 C/SiC 复合材料的内部微结构和损伤演变过程。此外，还使用数字体积相关（DVC）方法对原位加载过程中的三维应变场进行了定量分析。研究结果强调了氧化损伤对 C/SiC 复合材料机械响应的重大影响，尤其是在拉伸性能和断裂模式方面。在室温下，内部会出现严重的分层、纤维束拉断和界面脱粘现象。而在高温大气条件下，试样边缘发生了严重的纤维氧化反应，导致孔隙率迅速增加。裂纹从表面缺陷开始，然后迅速向内扩展。此外，虽然应变分布在断裂前保持相对均匀，但在室温下，断裂区附近出现了明显的应变集中，1650 ℃ 时的应变集中程度更高。值得注意的是，三维变形场中的应变集中区域与 DVC 定量分析显示的最终断裂位置密切相关。

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引用次数: 0

All-polymer syntactic foams: Linking large strain cyclic experiments to Quasilinear Viscoelastic modelling for materials characterisation 全聚合物合成泡沫：将大应变循环实验与用于材料表征的准线性粘弹性建模联系起来

IF 12.7 1区材料科学 Q1 ENGINEERING, MULTIDISCIPLINARY

Composites Part B: Engineering

Pub Date : 2024-10-11 DOI: 10.1016/j.compositesb.2024.111866

Sy-Ngoc Nguyen , Riccardo De Pascalis , Zeshan Yousaf , William J. Parnell

The time-dependent behaviour of polymeric composites is critical in a broad range of applications, including those in marine, aerospace, and automotive environments. In the present study, we assess the validity of the quasi-linear viscoelastic (QLV) model to fit the stress–strain behaviour of all-polymer syntactic foams under large cyclic compressional strain in a novel experimental configuration. These syntactic foams were manufactured by adding hollow polymer microspheres of various sizes and wall thicknesses into a polyurethane matrix. These materials are known for their relatively large initial stiffness, and strong recoverability after large strains. In the QLV model, several strain energy functions (SEFs) were employed, including neo-Hookean, Ogden type I, and type II. The bulk and shear moduli are presented in the form of a Prony series. By estimating these experimental data using optimisation, the natural viscoelastic material properties and coefficients associated with the SEF were determined. The influence of the microsphere filling fraction was also explored. We show that at the strain rate considered here of 0.013 s

^{- 1}

, the compressible QLV model coupled with the Ogden-I SEF is capable of providing an excellent fit to experimental data. Critically, this fit can be achieved over a range of cycles via model optimisation to the first cyclic response only.

在包括海洋、航空航天和汽车环境在内的广泛应用中，聚合物复合材料随时间变化的行为至关重要。在本研究中，我们评估了准线性粘弹性（QLV）模型的有效性，该模型适合全聚合物合成泡沫在一种新型实验配置中的大循环压缩应变下的应力-应变行为。这些合成泡沫是通过在聚氨酯基体中加入不同尺寸和壁厚的中空聚合物微球制造而成的。这些材料以其相对较大的初始刚度和较大应变后的较强恢复能力而闻名。在 QLV 模型中，采用了多种应变能函数 (SEF)，包括新胡克式、奥格登 I 型和 II 型。体积模量和剪切模量以 Prony 系列的形式呈现。通过优化估计这些实验数据，确定了与 SEF 相关的天然粘弹性材料特性和系数。我们还探讨了微球填充分数的影响。我们发现，在 0.013 s-1 的应变速率下，与奥格登-I SEF 相结合的可压缩 QLV 模型能够很好地拟合实验数据。重要的是，通过对第一个循环响应进行模型优化，这种拟合可以在一定的循环范围内实现。

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引用次数: 0

A pattern design strategy for microwave-absorbing coding metamaterials with tortuosity and connectivity 具有曲折性和连通性的微波吸收编码超材料的图案设计策略

IF 12.7 1区材料科学 Q1 ENGINEERING, MULTIDISCIPLINARY

Composites Part B: Engineering

Pub Date : 2024-10-10 DOI: 10.1016/j.compositesb.2024.111880

Ruijiang Fan , Dawei Li , Wenhe Liao , Tingting Liu , Xiangjia Li , Tengteng Tang , Junming Zhao , Tian Jiang

Microwave absorption presents a challenge for the design of metamaterials, which is critical for the stealth and electromagnetic compatibility. To address this, a novel design strategy for patterns is proposed to enhance the wave absorption, which is tortuosity and connectivity. Utilizing the carbon ink composite and genetic algorithm, multi-layer coding metamaterials (MCMs) are designed to satisfy diverse engineering specifications, with reflectivity tests confirming their efficacy. Temperature alternation experiments simulate frequent environmental changes, and the absorptivity of MCMs is compared to evaluate their resilience. This approach ensures the designed MCMs maintain performance and stability under variable thermal conditions, offering a robust solution for advanced applications.

微波吸收对超材料的设计提出了挑战，而超材料的设计对隐形和电磁兼容性至关重要。为解决这一问题，我们提出了一种新颖的图案设计策略，即迂回性和连通性来增强吸波能力。利用碳墨复合材料和遗传算法，设计出了多层编码超材料（MCMs），以满足不同的工程规范，并通过反射率测试证实了其功效。温度交替实验模拟了频繁的环境变化，并比较了 MCM 的吸收率，以评估其复原能力。这种方法可确保所设计的 MCM 在多变的热条件下保持性能和稳定性，为先进的应用提供稳健的解决方案。

引用次数: 0

Genome engineering of materials based on Ce doping, high-performance electromagnetic wave absorber for marine environment 基于掺杂 Ce 的材料基因组工程，用于海洋环境的高性能电磁波吸收器

IF 12.7 1区材料科学 Q1 ENGINEERING, MULTIDISCIPLINARY

Composites Part B: Engineering

Pub Date : 2024-10-09 DOI: 10.1016/j.compositesb.2024.111882

Lvtong Duan , Jintang Zhou , Jiaqi Tao , Yijie Liu , Yi Yan , Yucheng Wang , Xiaoli Yang , Xuewei Tao , Zhengjun Yao , Hexia Huang , Peijiang Liu , Yao Ma

Traditional microwave absorbing materials (MAM) are difficult to meet the current increasingly complex electromagnetic environment, MAM began to functionally integrated development to meet the needs of diversified applications. For the high humidity and high salt spray environment of the ocean, the development of electromagnetic absorber integrating microwave absorption (MA) and corrosion protection functions is imminent. In this work, high-quality genes were screened through materials genome engineering, and in-situ doping strategies of Ce gene were designed to synergistically enhance MA properties using composition modulation and structure modulation, the effective absorption bandwidth (EAB) of composite material WC@FCC1 can reach 5.62 GHz at an ultra-thin thickness of 1.66 mm. Thanks to the unique 4f orbital mechanism of Ce element, CeO₂ is endowed with excellent redox property, forming an oxide protective film on the surface, which prevents the entry of external corrosive media. The excellent corrosion protection performance of the composite material has been verified through electrochemical testing and molecular dynamics simulation. This work provides new design ideas for high-performance MAM, as well as new strategies and insights for functionally integrated electromagnetic absorber.

传统的微波吸收材料（MAM）难以满足当前日益复杂的电磁环境，MAM 开始向功能集成化发展，以满足多样化的应用需求。针对海洋的高湿度、高盐雾环境，开发集微波吸收（MA）和防腐蚀功能于一体的电磁吸收材料迫在眉睫。本研究通过材料基因组工程筛选出优质基因，并设计了Ce基因原位掺杂策略，利用成分调制和结构调制协同增强MA性能，使复合材料WC@FCC1在1.66毫米超薄厚度下的有效吸收带宽（EAB）达到5.62 GHz。由于 Ce 元素独特的 4f 轨道机制，CeO2 具有优异的氧化还原特性，能在表面形成一层氧化物保护膜，阻止外部腐蚀介质的进入。通过电化学测试和分子动力学模拟验证了该复合材料优异的腐蚀防护性能。这项工作为高性能 MAM 提供了新的设计思路，也为功能集成电磁吸收器提供了新的策略和见解。

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引用次数: 0

Damage characterization and modelling of FRP laminated composites subjected to external edge-on impact 受到外部边缘冲击的 FRP 层压复合材料的损伤表征和建模

IF 12.7 1区材料科学 Q1 ENGINEERING, MULTIDISCIPLINARY

Composites Part B: Engineering

Pub Date : 2024-10-09 DOI: 10.1016/j.compositesb.2024.111879

Nian Li , Jian Du , Hsiao Mun Lee , Weiling Liu , Yangyan Zheng , Heow Pueh Lee

This paper presents both experimental and numerical investigations into the edge-on impact behavior of T700/YPH307 composite laminates with varying lay-up designs and impact energy levels. Various non-destructive testing techniques, including visual inspection, ultrasonic C-scanning and X-ray computed tomography (CT), were used to detect the post-impact damage status and further reveal its 3D spatial distribution. A continuum damage mechanics (CDM) model, incorporating in-plane shear nonlinearity, fracture plane angle within anisotropic materials, as well as fiber kinking failure in longitudinal compression, was established using an explicit solver. Detailed comparison of the experimental and numerical results was conducted in mechanical response curves and failure mechanisms, where a good agreement was observed. Parameter analyses on the in-situ strengths and the friction coefficient were also performed, offering guidelines for the edge-on impact modelling. Failure mechanisms induced by edge-on impact typically exhibit two distinct features: a highly localized debris wedge, which can be regarded as a trigger in the subsequent occurrence of damage, and the bending fracture of the outer plies resulting from the wedge effect during the oscillating stage of an impact force plateau. Besides, higher impact energy exacerbated internal damage, while the influence of the lay-ups was relatively limited.

本文通过实验和数值研究，探讨了不同铺层设计和冲击能量水平下 T700/YPH307 复合材料层压板的边缘冲击行为。采用了多种无损检测技术，包括目视检测、超声波 C 扫描和 X 射线计算机断层扫描 (CT)，以检测冲击后的损伤状态，并进一步揭示其三维空间分布。利用显式求解器建立了一个连续损伤力学（CDM）模型，其中包含面内剪切非线性、各向异性材料中的断裂面角度以及纵向压缩中的纤维扭结破坏。在机械响应曲线和破坏机理方面，对实验结果和数值结果进行了详细比较，结果表明两者具有良好的一致性。此外，还对原位强度和摩擦系数进行了参数分析，为边缘冲击建模提供了指导。边缘冲击诱发的破坏机制通常表现出两个明显的特征：高度局部化的碎片楔形（可视为随后发生破坏的触发器），以及在冲击力高原振荡阶段楔形效应导致的外层弯曲断裂。此外，较高的冲击能量会加剧内部损坏，而铺层的影响则相对有限。

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引用次数: 0

A novel rapid fabrication method and in-situ densification mechanism for ceramic matrix composite 陶瓷基复合材料的新型快速制造方法和原位致密化机制

IF 12.7 1区材料科学 Q1 ENGINEERING, MULTIDISCIPLINARY

Composites Part B: Engineering

Pub Date : 2024-10-09 DOI: 10.1016/j.compositesb.2024.111881

Yijun Zhang , Yifan Xue , Yu Liu , Weijie Li , Kaiqiang Liu , Weijian Han , Zhongwei Zhang

The extensive application of ceramic matrix composites has always been limited due to the long-period and expensive process. Hence, this research introduces a rapid manufacturing method named as ViS_fP-TiCOP (High Viscosity Solvent-free Precursor Combined Elemental Titanium Controlled Pyrolysis). The solvent-free precursor possesses high viscosity (30 °C, 10⁶ mPa S) and wide molecular weight distribution (M_z/M_w = 3.3), accomplishing stable loading of inorganic fillers. Simultaneously, the elementary titanium and ZrB₂, as the active and inert filler, are dopped into the precursor to control the pyrolysis. The ViS_fP-TiCOP technique offers a rapid method to manufacture CMCs under pressureless and low pyrolysis temperature conditions (1200 °C). Comparing to the addition of ZrB₂, the precursor with titanium provides an exceptional ceramic yield of 87 wt%, leading a notable enhancement in the rate of densification. This high densification efficiency is attributed to an in-situ titanium gas-phase reaction, besides with the high degree of cross-linking and low volatile of precursor. After undergoing three cycles of impregnation-pyrolysis, the porosity of C/SiBCN–Ti was discovered to be below 10 vol%, whereas that of C/SiBCN-25 wt%ZrB₂ still remained as high as 20.91 vol%. The ViS_fP-TiCOP technology can provide guidance for low-cost and rapid preparation of CMCs.

由于陶瓷基复合材料的生产周期长、成本高，其广泛应用一直受到限制。因此，本研究引入了一种名为 ViSfP-TiCOP（高粘度无溶剂前驱体结合元素钛可控热解）的快速制造方法。无溶剂前驱体具有高粘度（30 °C，106 mPa S）和宽分子量分布（Mz/Mw = 3.3），可实现无机填料的稳定负载。同时，作为活性和惰性填料的基本钛和 ZrB2 被掺入前驱体中，以控制热解。ViSfP-TiCOP 技术提供了一种在无压和低热解温度（1200 °C）条件下快速制造 CMC 的方法。与添加 ZrB2 相比，含钛前驱体的陶瓷产量高达 87 wt%，显著提高了致密化率。这种高致密化效率归功于原位钛气相反应，以及前驱体的高交联度和低挥发性。经过三次浸渍-热解循环后，发现 C/SiBCN-Ti 的孔隙率低于 10 Vol%，而 C/SiBCN-25 wt%ZrB2 的孔隙率仍高达 20.91 Vol%。ViSfP-TiCOP 技术可为低成本快速制备 CMC 提供指导。

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引用次数: 0

Imaging and reconstruction of asymmetric wrinkles in carbon fibre composites using high-frequency eddy current and full matrix capture-based ultrasound 利用高频涡流和全基质捕获超声波对碳纤维复合材料中的不对称皱纹进行成像和重建

IF 12.7 1区材料科学 Q1 ENGINEERING, MULTIDISCIPLINARY

Composites Part B: Engineering

Pub Date : 2024-10-09 DOI: 10.1016/j.compositesb.2024.111873

Qiuji Yi , Vincent Maes , Wai Lok Woo , Paul Wilcox , Robert Hughes

Ply wrinkles are a common defect found in Carbon Fiber Reinforced Polymer (CFRP) laminates that can lead to failure in composite structures if not correctly evaluated during manufacture stages. The mechanical performance of a structure depends on multiple parameters of a wrinkle, such as amplitude, wavelength, and asymmetry, which ideally need to all be measured to characterise the wrinkle properly. To address this issue, the authors designed and manufactured a set of complex wrinkles with various asymmetry offsets and amplitude and obtained raw data by testing them with a high-frequency eddy-current system. A unique trajectory in the complex Nyquist plot was found on asymmetric wrinkles, demonstrating the dominant influence of wrinkle asymmetry on electrical resistance. The authors also used full matrix capture ultrasound to characterise the wrinkles and measured the profiles by extracting texture phase randomness. The study revealed the superior capability of FMC UT for characterising and retrieving the profile in wrinkle coupons, while HF ECT was more adaptable for identifying the region of interest effectively. This work also implements a state-of-the-art deep fusion strategy to demonstrate a lightweight architecture can be easily used to combine multiple sources of wrinkle profiles and generate a more accurate prediction than traditional methods. Overall, the demonstrated work can be further applied to CFRPs with increasing geometric complexity and defects to facilitate the design efficiency and testing of CFRP components.

层状皱纹是碳纤维增强聚合物（CFRP）层压板中常见的缺陷，如果在制造阶段不加以正确评估，可能会导致复合材料结构失效。结构的机械性能取决于皱纹的多个参数，如振幅、波长和不对称性，理想情况下需要对所有这些参数进行测量，以正确描述皱纹的特征。为了解决这个问题，作者设计并制造了一组具有不同不对称偏移和振幅的复杂皱纹，并通过高频涡流系统测试获得了原始数据。在不对称皱纹上发现了复杂奈奎斯特图的独特轨迹，证明了皱纹不对称对电阻的主要影响。作者还使用了全矩阵捕获超声波来描述皱纹的特征，并通过提取纹理相随机性来测量纹理轮廓。研究表明，FMC UT 在表征和检索皱纹试样的轮廓方面能力出众，而 HF ECT 则更适合有效识别感兴趣的区域。这项工作还实施了最先进的深度融合策略，证明轻量级架构可轻松用于结合多种来源的皱纹轮廓，并生成比传统方法更准确的预测结果。总之，所展示的工作可进一步应用于几何复杂性和缺陷不断增加的 CFRP，以促进 CFRP 组件的设计效率和测试。

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引用次数: 0

Preparation of self-healing MXene/chitosan/benzaldehyde-polyurethane flexible conductive coating for dual-mode sensing applications 制备用于双模传感应用的自愈合 MXene/壳聚糖/苯甲醛聚氨酯柔性导电涂层

IF 12.7 1区材料科学 Q1 ENGINEERING, MULTIDISCIPLINARY

Composites Part B: Engineering

Pub Date : 2024-10-08 DOI: 10.1016/j.compositesb.2024.111875

Hang Zhang , Longhai Yi , Yezhou Ni , Zhenhua Jia , Hua Qiu , Kunlin Chen

Flexible conductive coatings have the potential to imbue traditional textiles with a range of functional or intelligent properties, including sensing, light emission, heat generation, etc. However, these flexible coatings are prone to damage from external forces in real-world applications. This study focuses on developing a chemically modified flexible coating with MXene as a conductive ligand, aiming to strike the characteristics of mechanical, conductive, and self-healing harmoniously. The process involves synthesizing modified 4-vinyl benzaldehyde into polyurethane (VPU), which is then cross-linked with chitosan to enhance the self-healing efficiency. The conductive ligand, MXene, was modified with tannic acid to strengthen hydrogen bonding with the VPUs. The resulting self-healing waterborne polyurethane conductive coating exhibits an impressive self-healing efficiency of 96 %, along with a high tensile strength at a break of 5.58 MPa and an elongation at a break of 340 %. It also demonstrates antimicrobial effects against Escherichia coli and Staphylococcus aureus of up to 86.8 % and 90.1 %, respectively. Importantly, this study also explores the wearable applications of flexible electronic devices. They can detect pressures up to 100 kPa in a maximum sensitivity of 0.204 kPa⁻¹ in the initial pressure range from 1 to 15 kPa. They can also monitor the pressure response of the foot in different motion states, suggesting potential integration with insoles or socks. This work offers a practical method for combining the key properties of polymer conductive coatings with the design of carbon nanomaterial-based stress-strain sensors. They are potentially applied to this approach including smart robots, e-skins, wearable health management systems, and artificial intelligence, among others.

柔性导电涂层有可能为传统纺织品注入一系列功能或智能特性，包括传感、发光、发热等。然而，这些柔性涂层在实际应用中容易受到外力破坏。本研究的重点是开发一种以 MXene 为导电配体的化学修饰柔性涂层，旨在协调兼顾机械、导电和自愈等特性。该工艺包括将改性的 4-乙烯基苯甲醛合成为聚氨酯（VPU），然后与壳聚糖交联以提高自愈合效率。导电配体 MXene 用单宁酸改性，以加强与 VPU 的氢键结合。最终制成的自愈合水性聚氨酯导电涂层的自愈合效率高达 96%，断裂拉伸强度高达 5.58 兆帕，断裂伸长率为 340%。它对大肠杆菌和金黄色葡萄球菌的抗菌效果分别高达 86.8% 和 90.1%。重要的是，这项研究还探索了柔性电子设备的可穿戴应用。在 1 至 15 千帕的初始压力范围内，它们能以 0.204 千帕-1 的最大灵敏度检测到高达 100 千帕的压力。它们还能监测脚部在不同运动状态下的压力反应，这表明有可能与鞋垫或袜子集成。这项工作为将聚合物导电涂层的关键特性与基于碳纳米材料的应力应变传感器的设计相结合提供了一种实用方法。它们有可能应用于智能机器人、电子皮肤、可穿戴健康管理系统和人工智能等领域。

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引用次数: 0