【新文速递】2024年12月14日固体力学SCI期刊最新文章

今日更新：Composites Part A: Applied Science and Manufacturing 2 篇，Composites Part B: Engineering 4 篇，Composites Science and Technology 2 篇Composites Part A: Applied Science and ManufacturingCharacterisation of near pure mode II quasi-static and fatigue delamination behaviour of a carbon-glass interface using a pure-moment-loaded DCB test rigIñigo Urcelay Oca, Simon Mosbjerg Jensen, Brian Lau Verndal Bak, Fahimeh Shakibapour, Esben Lindgaarddoi:10.1016/j.compositesa.2024.108625利用纯矩加载DCB试验装置表征碳-玻璃界面的近纯II型准静态和疲劳分层行为This work covers the characterisation of delamination growth in a carbon-glass interface, representative of the one in a wind turbine blade. A pure-moment-loaded Double Cantilever Beam (DCB) test rig is used under quasi-static and fatigue loading. A new fatigue characterisation procedure is adopted by real-time controlling the prescribed energy release rate G . This procedure enables sweeping any desired G range at a user-defined rate independently of the compliance of the specimen. A finite element simulation using a cohesive zone model confirms the testing was performed at near pure mode II conditions. From the quasi-static tests, the onset and steady-state fracture toughnesses are characterised. Fibre bridging is observed, which is believed to explain the characterised R-curve effect. From the fatigue tests, Paris’ law is characterised in a wide G m a x range in each test. The characterisation of the quasi-static and fatigue fracture behaviour of the carbon-glass interface is thus successfully achieved.这项工作涵盖了碳-玻璃界面中分层生长的特征，代表了风力涡轮机叶片中的分层生长。采用纯矩加载双悬臂梁（DCB）试验台进行准静态和疲劳载荷试验。通过实时控制规定的能量释放率G，采用了一种新的疲劳表征方法。该程序能够以用户定义的速率扫描任何所需的G范围，而不受试样的依从性的影响。利用内聚区模型进行的有限元模拟证实了试验是在接近纯模态II条件下进行的。通过准静态试验，分析了初始断裂韧度和稳态断裂韧度。观察到纤维桥接，这被认为解释了特征的r曲线效应。从疲劳试验来看，巴黎定律在每次试验中都具有很宽的gm2 a x范围。因此，碳-玻璃界面的准静态和疲劳断裂行为的表征是成功的。Microstructural Characterisation of fibre-hybrid polymer composites using U-Net on optical imagesJi Dong, Ali Kandemir, Ian Hamertondoi:10.1016/j.compositesa.2024.108569基于光学图像的U-Net表征纤维杂化聚合物复合材料微观结构This study investigates the application of deep learning-based image segmentation using 2D optical imaging for the microstructural characterisation of composite materials with hybridised fibres, offering a potentially cost-effective alternative to computed tomography/3D imaging. Laminates were produced using the HiPerDiF method, combining discontinuous carbon and basalt fibres to reinforce a poly(L-lactic acid) (PLA) matrix. The results demonstrate that the Generalised Dice Loss function significantly outperforms others, particularly in the void class, achieving a 19% improvement in Dice Similarity Score on an unseen dataset for full image characterisation. Similarly, for Boundary Intersection over Union (IoU), which measures the accuracy of local boundary detail capture, the model trained with Generalised Dice Loss achieved 61.4%, compared to 55.0% for the next best model trained with Compound Loss. These findings suggest that regional loss functions are better suited for image-based microstructural characterisation and quality inspection. Additionally, volume fraction, relative fibre and void ratios, and fibre alignment computed from the segmentation results closely match ground truth data. Challenges related to data limitations and variability are also briefly discussed.本研究探讨了基于深度学习的图像分割的应用，使用二维光学成像来表征混合纤维复合材料的微观结构，为计算机断层扫描/3D成像提供了一种潜在的经济可行的替代方案。层压板采用HiPerDiF方法生产，结合不连续的碳和玄武岩纤维来增强聚乳酸（PLA）基质。结果表明，广义骰 子损失函数明显优于其他函数，特别是在void类中，在完整图像表征的未见数据集上，骰 子相似度得分提高了19%。类似地，对于边界交集（IoU），测量局部边界细节捕获的准确性，用广义骰 子损失训练的模型达到了61.4%，而用复合损失训练的下一个最佳模型为55.0%。这些发现表明，区域损失函数更适合于基于图像的微结构表征和质量检测。此外，根据分割结果计算的体积分数、相对纤维和空隙比以及纤维排列与地面真实数据非常吻合。还简要讨论了与数据限制和可变性有关的挑战。Composites Part B: EngineeringA unified strain energy-based fatigue life prediction methodology for composite and metal adhesive joints: Effects of adhesive, geometry and, environmentFernando Castro Sousa, Alireza Akhavan-Safar, Ricardo J.C. Carbas, Eduardo A.S. Marques, Lucas F.M. da Silvadoi:10.1016/j.compositesb.2024.112022基于应变能的复合材料和金属粘接接头疲劳寿命预测方法：粘接、几何和环境的影响Ensuring the efficiency and safety of bonded structures across diverse engineering sectors requires a robust fatigue model for adhesive joints in both composite and metal substrates. This study presents a unified fatigue life prediction methodology for similar and dissimilar composite and metal adhesive joints. The proposed model integrates hydrostatic and deviatoric strain energy density components with the theory of critical distances. The model has been validated against diverse experimental data from different joint geometries, loading conditions, and different environments. The linear-elastic assumption is sufficient for toughened epoxies, whereas an elastoplastic model is necessary for ductile methacrylate adhesives. Calibration based on a single fatigue test yields the highest accuracy, while quasi-static test calibration is also satisfactory. The methodology addresses diverse loading conditions and environmental factors, showing a strong correlation with experimental results. It advances the performance, design, and reliability of similar and dissimilar composite to metal adhesive joints.为了确保不同工程领域的粘合结构的效率和安全性，需要针对复合材料和金属基板的粘合接头建立一个强大的疲劳模型。提出了一种统一的相似和不同复合材料和金属粘接接头疲劳寿命预测方法。该模型将流体静力和偏应变能密度分量与临界距离理论相结合。该模型已通过不同节点几何形状、加载条件和不同环境的实验数据进行了验证。对于增韧环氧树脂，线弹性假设是足够的，而对于延性甲基丙烯酸酯胶粘剂，弹塑性模型是必要的。基于单一疲劳试验的校准精度最高，而准静态试验校准也令人满意。该方法考虑了不同的加载条件和环境因素，与实验结果有很强的相关性。它提高了相似和不同复合材料对金属粘合接头的性能、设计和可靠性。Preparation of energy-efficient, environmentally friendly and high-strength biocomposites from wood fibre ultramicro self-composite cellulose matricesMingTao Bai, Yang Yang, Lei Zhang, HongFei Huo, Jijuan Zhang, Zhifeng Wang, Zhongfeng Zhangdoi:10.1016/j.compositesb.2024.112047 木纤维超微自复合纤维素基质制备节能环保高强生物复合材料Considering the diminishing forest as a natural resource, the efficient use of small-diameter shrubs is crucial for global sustainable development. This approach has significant potential to prevent wasting forest resources and reduce carbon emissions. However, small-diameter timber has inherent drawbacks, such as the looseness of this material, susceptibility to cracking and deformation, and low strength, all of which significantly impact its range of applications. In this study, an efficient, green method was developed to prepare adhesive-free biocomposites from discarded small-diameter shrubs via ultrasonic pretreatment and thermoforming. After the ultrasonic pretreatment, the flexural and tensile strengths of the biocomposites increased by 145% and 132%, respectively. Ultrasonic pretreatment separated and destroyed chemical bonds among the lignocellulosic biomass macromolecules through high-speed shear and microjets. This process significantly increased the amount of binding sites on the cellulose fibres, and further densified the cell walls through hot pressing. Moreover, the ultrasonic pretreatment may remove components of the wood flour that act as fillers or density enhancers, resulting in a reduction in the density of the biocomposite. Simultaneously, lignin acted as a binder and improved fibre bonding through both physical and chemical cross-linking, resulting in a dense cellulose structure with a three-dimensional lattice structure and a less hydrophilic surface, as evidenced by a water contact angle of 81.72°. In addition, the high-quality, binder-free biocomposites did not emit harmful gases such as formaldehyde. Hence, they are expected to become sustainable materials for building decoration and furniture applications in the future.考虑到森林作为一种自然资源的日益减少，小直径灌木的有效利用对全球可持续发展至关重要。这种方法在防止森林资源浪费和减少碳排放方面具有巨大潜力。然而，小直径木材具有固有的缺点，例如材料的松散，易开裂和变形，强度低，所有这些都严重影响了其应用范围。本研究开发了一种高效、绿色的方法，通过超声波预处理和热成型，从废弃的小直径灌木中制备无粘合剂生物复合材料。经超声预处理后，生物复合材料的抗弯强度和拉伸强度分别提高了145%和132%。超声波预处理通过高速剪切和微射流分离和破坏木质纤维素生物质大分子之间的化学键。这一过程显著增加了纤维素纤维上结合位点的数量，并通过热压使细胞壁进一步致密化。此外，超声波预处理可以去除木粉中作为填料或密度增强剂的成分，从而导致生物复合材料密度的降低。同时，木质素作为粘合剂，通过物理交联和化学交联改善纤维的结合，使纤维素结构致密，具有三维晶格结构，表面亲水性较低，水接触角为81.72°。此外，这种高质量、无粘合剂的生物复合材料不会释放甲醛等有害气体。因此，它们有望成为未来建筑装饰和家具应用的可持续材料。Enhanced carbon fiber interface with thermoplastics via nanostructure surface modification: failure, morphology and wettability analysisWeiqing Fang, Adam Pearson, Yige Huang, Hani E. Naguibdoi:10.1016/j.compositesb.2024.112054 通过纳米结构表面改性增强碳纤维与热塑性塑料的界面：失效、形貌和润湿性分析Improving the fiber-matrix adhesion in thermoplastic composites remains a significant challenge due to the lack of chemical bonding between thermoplastics and common reinforcing fibers. This study investigates the effectiveness of carbon fibers enhanced with nanostructure surface modification for strengthening the interfacial adhesion to thermoplastic matrices. The fiber surface was modified with graphene nanoplatelets (GNP) through the facile coating method, and the apparent interfacial shear strength (IFSS) was determined by the single-fiber pullout test. GNP-coated fiber improved IFSS by 74% with neat high-density polyethylene (HDPE-Neat) and 28% with maleic anhydride-grafted HDPE (HDPE-8MA), while reduced by 27% with polyamide 6 (PA6) due to different failure mechanisms. Morphology, chemical, and wettability analysis were conducted on the nano-enhanced carbon fibers to quantitatively elucidate these findings on micro/nanoscale, combining machine learning-based image segmentation, X-ray photoelectron spectroscopy (XPS), and contact-angle measurements of intermittent beading on fibers.由于热塑性塑料与普通增强纤维之间缺乏化学结合，提高热塑性复合材料中纤维-基体的粘附性仍然是一个重大挑战。本研究考察了纳米结构表面改性增强碳纤维与热塑性基体界面粘附的有效性。用石墨烯纳米薄片（GNP）通过易涂法对纤维表面进行改性，并通过单纤维拉拔试验测定纤维的表观界面剪切强度（IFSS）。采用纯高密度聚乙烯（HDPE- neat）和马来酸酐接枝HDPE （HDPE- 8ma）分别提高了74%和28%的IFSS，而采用聚酰胺6 （PA6）由于失效机制的不同，使IFSS降低了27%。结合基于机器学习的图像分割、x射线光电子能谱（XPS）和纤维上间歇性珠状的接触角测量，对纳米增强碳纤维进行了形态学、化学和润湿性分析，以在微/纳米尺度上定量阐明这些发现。Controllable fabrication of the luminescent photocatalytic material AgB/SMSO for application in cement: Optimization of doping strategies and all-weather degradation of pollutantsXinjie Cai, Yidong Xudoi:10.1016/j.compositesb.2024.112060水泥用发光光催化材料AgB/SMSO的可控制备：掺杂策略优化及污染物全天候降解This paper presents an innovative luminescent photocatalytic material, Ag3PO4/BiVO4/Sr2MgSi2O7:(Eu2+, Dy3+) (AgB/SMSO), which overcomes a pivotal limitation of photocatalysts—dependence on a light source—and effectively remediates pollutants and augments cement-based composite properties. The efficient carrier separation facilitated by Ag3PO4, in conjunction with the broad spectral response of BiVO4, enables AgB/SMSO to harness the internal luminescent properties of SMSO as a persistent light source, achieving continuous degradation of pollutants, which reveals the exceptional afterglow characteristics and photocatalytic activity of AgB/SMSO. At a 1:1:40 ratio, AgB/SMSO maintained its catalytic efficacy for over 8 h in the dark (methylene blue degradation rate of 70.43%), surpassing the 3-hour limit of current luminescent photocatalysts. Furthermore, the impact of integrating AgB/SMSO with cement on early-stage cement hydration, morphology, and micromechanical properties was comprehensively assessed. Ultimately, the overall photocatalytic capability of the derived AgB/SMSO cement-based composites was evaluated through experiments, revealing the synergistic mechanisms involved. This study not only enriches the theoretical understanding of photocatalysis but also provides a robust technical foundation for the innovation of environmentally friendly building materials and the advancement of sustainable urban development.本文提出了一种创新的发光光催化材料Ag3PO4/BiVO4/Sr2MgSi2O7:(Eu2+, Dy3+) (AgB/SMSO)，它克服了光催化剂依赖光源的关键限制，有效地修复了污染物并增强了水泥基复合材料的性能。Ag3PO4促进了高效的载流子分离，结合BiVO4的广谱响应，使AgB/SMSO能够利用SMSO的内部发光特性作为持续光源，实现污染物的连续降解，这揭示了AgB/SMSO独特的余辉特性和光催化活性。在1:1:40的比例下，AgB/SMSO在黑暗中保持了8 h以上的催化效果（亚甲蓝降解率为70.43%），超过了目前发光光催化剂3小时的极限。此外，还综合评估了AgB/SMSO与水泥的掺入对水泥早期水化、形态和微观力学性能的影响。最后，通过实验评估了衍生的AgB/SMSO水泥基复合材料的整体光催化能力，揭示了所涉及的协同机制。本研究不仅丰富了光催化的理论认识，而且为环保建筑材料的创新和城市可持续发展的推进提供了坚实的技术基础。Composites Science and TechnologyInfluence of expansion ratio and multilayered gradient structure on the electromagnetic interference shielding performance of lightweight poly (lactic acid)/carbon nanostructures composite foamsQian Ren, Youquan Wei, Xueyun Li, Cao Yu, Long Wang, Bin Shen, Wenge Zhengdoi:10.1016/j.compscitech.2024.110992 膨胀率和多层梯度结构对轻质聚乳酸/碳纳米复合泡沫电磁干扰屏蔽性能的影响Cellular structures incorporated in conductive polymer composites (CPC) are gaining recognition as a promising alternative to traditional metal materials for electromagnetic interference (EMI) shielding applications, owing to their outstanding properties and lightweight nature. In this study, the polylactic acid (PLA)/carbon nanostructure (CNS) composite foam with a multilayered gradient structure was prepared by supercritical carbon dioxide (CO2) foaming technology. The original size of the sample, saturation pressure, and foaming temperature had obvious effects on the foaming behavior of the PLA/CNS composite. In the prepared multilayered gradient-structured sample, the CNS content increased layer by layer (from 1 wt% to 7 wt%), and its density could be as low as 0.22 g/cm³. In addition, the EMI SE value of the prepared sample could be as high as 51.8 dB with an absorption coefficient of 0.85, thus providing superior EMI shielding performance. This result indicated that high-performance and lightweight polymer-based shielding materials could be obtained by preparing multilayered gradient-structured foam samples, which have broad application prospects in aerospace and electronics.导电性聚合物复合材料（CPC）的细胞结构由于其优异的性能和轻便的特性，被认为是传统金属材料在电磁干扰（EMI）屏蔽应用中的一种有前途的替代品。本研究采用超临界二氧化碳（CO2）发泡技术制备了具有多层梯度结构的聚乳酸(PLA)/碳纳米结构（CNS）复合泡沫材料。样品的原始尺寸、饱和压力和发泡温度对PLA/CNS复合材料的发泡行为有明显的影响。在制备的多层梯度结构样品中，CNS含量逐层增加（从1 wt%增加到7 wt%），其密度可低至0.22 g/cm³。此外，制备的样品的EMI SE值可高达51.8 dB，吸收系数为0.85，具有优异的EMI屏蔽性能。这一结果表明，制备多层梯度结构泡沫样品可以获得高性能轻质聚合物基屏蔽材料，在航空航天和电子领域具有广阔的应用前景。Enhanced Electromagnetic Wave Absorption and Thermal Conductivity in Epoxy Composites with a Heterostructure-Rich 3D MoS₂/CMF Network FrameworkHaoran Geng, Long Zhao, Jing Deng, Jingru Chen, Yihao Fan, Qingyun Zhao, Hongxing Gui, Jianhe Liao, Yanfang Zhao, Yongxin Qian, Guizhen Wangdoi:10.1016/j.compscitech.2024.110993 具有丰富异质结构的三维MoS 2 /CMF网络框架的环氧复合材料的电磁波吸收和导热性With the widespread application of highly integrated and high-frequency power devices in the electronics field, traditional electronic packaging materials can no longer effectively resist the harm caused by electromagnetic interference and heat accumulation to electronic equipment. To address these challenges, we have successfully constructed a heterostructure-rich dual-level three-dimensional (3D) network framework (MoS2/CMF) by effectively integrating molybdenum disulfide (MoS2) with carbonized melamine foam (CMF). These fillers were then composited with epoxy resin (EP) to develop MoS2/CMF/EP composites exhibiting both electromagnetic wave absorption (EMA) and enhanced thermal conductivity. Specifically, two-dimensional (2D) MoS2 nanosheets with a 1T/2H-phase structure uniformly grew on the surface of CMF, improving the poor impedance characteristics of the 3D carbon structure and increasing heterointerfaces and multiple scattering abilities. Owing to the synergistic effects of attenuation performance and impedance matching, the EP-based MoS2/CMF-1 composite demonstrated an impressive reflection loss value of -64.80 dB and an effective absorption bandwidth of 8.48 GHz, achieved with only a 5 wt.% loading. Correspondingly, CST simulation results indicated that when electromagnetic waves are vertically incident on MoS2/CMF-1/EP samples, the radar cross-section (RCS) attenuation value can reach up to 35.4 dBm2. Moreover, the highly interconnected 3D carbon structure of CMF provides broad pathways for phonon transport, resulting in the thermal conductivity of MoS2/CMF-1/EP reaching 0.41 W/m·K at room temperature, a nearly 141% improvement compared to pure EP. This multifunctional EP-based composite, with its high-efficiency EMA and thermal management performance, shows great potential for application in the packaging of highly integrated electronic devices.随着高集成度、高频功率器件在电子领域的广泛应用，传统的电子封装材料已不能有效抵御电磁干扰和热量积累对电子设备造成的危害。为了解决这些挑战，我们通过将二硫化钼（MoS2）与碳化三聚氰胺泡沫（CMF）有效整合，成功构建了富含异质结构的双层三维（3D）网络框架（MoS2/CMF）。然后将这些填料与环氧树脂（EP）复合，制备出具有电磁波吸收（EMA）和增强导热性的MoS2/CMF/EP复合材料。具体而言，具有1T/ 2h相结构的二维（2D） MoS2纳米片在CMF表面均匀生长，改善了三维碳结构的阻抗特性，增加了异质界面和多次散射能力。由于衰减性能和阻抗匹配的协同效应，基于ep的MoS2/CMF-1复合材料显示出令人印象深刻的反射损耗值为-64.80 dB，有效吸收带宽为8.48 GHz，负载仅为5.wt .%。相应的，CST仿真结果表明，电磁波垂直入射到MoS2/CMF-1/EP样品上，雷达截面（RCS）衰减值可达35.4 dBm2。此外，高度互连的CMF三维碳结构为声子输运提供了广阔的途径，导致MoS2/CMF-1/EP在室温下的导热系数达到0.41 W/m·K，比纯EP提高了近141%。这种多功能ep基复合材料具有高效的EMA和热管理性能，在高度集成的电子器件封装中显示出巨大的应用潜力。来源：复合材料力学仿真Composites FEM