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【新文速递】2023年11月1日复合材料SCI期刊最新文章

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今日更新:Composite Structures 6 篇,Composites Part A: Applied Science and Manufacturing 1 篇,Composites Part B: Engineering 1 篇,Composites Science and Technology 1 篇

Composite Structures

Effects of fiber layout on strength and failure of 3D printed notched composites

Battini Davide, Giorleo Luca, Avanzini Andrea

doi:10.1016/j.compstruct.2023.117644

纤维布局对 3D 打印缺口复合材料强度和失效的影响

This study investigates the effect of printing strategies on the strength of additively manufactured notched fiber reinforced composite specimens. Specimens with varying notch geometries (two radii and two opening angles) and fiber layouts (unreinforced, unidirectional, quasi-isotropic and concentric) were 3D printed and tested under tension. Digital image correlation provided surface strain field data. Results showed that fiber deposition patterns significantly impact notch sensitivity, failure loads and mechanisms, with notch geometry being of secondary importance. The unidirectional layout achieved the highest strength but with progressive failure, while quasi-isotropic specimens failed abruptly from the notch. The concentric layout shielded the notch region but induced premature failure away from the notch due to transverse stress. Stress concentration factor approaches, which work well for conventional laminates, have limitations for 3D printed composites due to local differences and complex interactions. Optimizing fiber deposition, instead of geometry, emerges as a promising design route. Combining unidirectional and contouring algorithms may improve performance. However, further studies utilizing multiscale modelling and local failure analyses are needed to fully understand failure mechanisms and guide optimal notch designs for 3D printed composites. With improved understanding and design methods, 3D printing promises to unlock new possibilities for structurally efficient notched composite parts.

本研究探讨了打印策略对加成法制造的缺口纤维增强复合材料试样强度的影响。试样具有不同的切口几何形状(两个半径和两个开口角度)和纤维布局(非增强、单向、准各向同性和同心),经三维打印后进行拉伸测试。数字图像相关性提供了表面应变场数据。结果表明,纤维沉积模式对缺口敏感性、失效载荷和机理有重大影响,缺口几何形状则次之。单向布局的试样强度最高,但会逐渐失效,而准各向同性试样则会从缺口处突然失效。同心布局可遮挡缺口区域,但由于横向应力的影响,会导致远离缺口的试样过早失效。应力集中因子方法对传统层压板效果良好,但由于局部差异和复杂的相互作用,对三维打印复合材料有一定的局限性。优化纤维沉积,而不是几何形状,是一种很有前途的设计方法。结合单向算法和轮廓算法可以提高性能。不过,还需要利用多尺度建模和局部失效分析进行进一步研究,以充分了解失效机制,并指导三维打印复合材料的最佳缺口设计。随着理解和设计方法的改进,3D 打印有望为结构高效的缺口复合材料部件带来新的可能性。


Highly strain rate sensitive and ductile composite materials combining soft with stiff TPMS polymer-based interpenetrating phases

Singh Agyapal, Al-Ketan Oraib, Karathanasopoulos Nikolaos

doi:10.1016/j.compstruct.2023.117646

 

将基于 TPMS 聚合物的软硬互穿相组合在一起的高应变速率敏感性和韧性复合材料

The current work investigates the engineering of strain-rate sensitive and ductile composites through the combination of stiff, triply-periodic-minimal-surface (TPMS) with soft, rubber-type material phases. Different interpenetrating phase composite (IPC) designs are considered, with Diamond, Fisher-Koch, and IWP TPMS architectures as reinforcement phase topologies. The loading rate sensitivity of the arising IPCs is evaluated at different strain-rates, revealing an effective composite performance that well separates from the either brittle or substantially low-strength behavior of its constituent materials. Significant strain-rate effects are recorded, which relate to increased stiffness and energy absorption attributes upon substantial ductility, with the actual performance to depend on the underlying reinforcement phase topology. The effective strain-rate IPC constitutive response is well-captured by dedicated, low numerical cost and high accuracy machine learning models, whereas Digital Image Correlation (DIC) and finite element analysis are employed to provide insights in the inner strain and stress fields developed and failure modes observed. Overall, energy absorptions higher than 10 and up to 14 MJ m-3 are reported for strain-rates in the order of 100, furnishing specific energy absorptions (SEA) in the uppermost range of the effective composite material behaviors up to now reported, upon exceptionally high crushing force efficiencies (CFE) at moderate densities.

目前的研究工作是通过将坚硬的三周期最小表面(TPMS)与柔软的橡胶类材料相组合,研究应变速率敏感型韧性复合材料的工程设计。研究考虑了不同的互穿相复合材料(IPC)设计,将金刚石、费希尔-科赫和 IWP TPMS 结构作为增强相拓扑结构。在不同的应变速率下,对所产生的 IPC 的加载速率敏感性进行了评估,结果表明,有效的复合材料性能完全不同于其组成材料的脆性或实质上的低强度行为。研究记录了显著的应变速率效应,这与增加的刚度和能量吸收属性有关,而实际性能则取决于底层增强相拓扑结构。专用、低数值成本和高精度的机器学习模型可以很好地捕捉到有效应变速率 IPC 构成响应,而数字图像相关性(DIC)和有限元分析则用于深入了解内部应变和应力场的发展以及所观察到的失效模式。总体而言,在应变速率为 100 的情况下,能量吸收高于 10 兆焦耳/立方米,最高可达 14 兆焦耳/立方米,在中等密度下具有极高的破碎力效率 (CFE) 时,比能量吸收 (SEA) 达到了目前所报道的有效复合材料行为的最高范围。


A unified hybrid Ritz-SEA acoustic vibration coupling method of a rectangular plate coupled with fast multipole boundary integration

Zhao Yiming, Wang Zhonggang, Yang Zhigang, Qin Bin

doi:10.1016/j.compstruct.2023.117650

与快速多极边界积分相结合的矩形板声学振动耦合统一混合 Ritz-SEA 方法

The Ritz method, based on a segmental strategy, is known for its fast convergence and ability to handle arbitrary boundary conditions while maintaining accuracy comparable to benchmark solutions. It is particularly effective in calculating vibrations in composite laminates, functionally graded plates, and other novel plate types. However, this method faces challenges in accurately calculating the mid-frequency problems that arise between plate structures and acoustic cavities. To fill this gap, this paper proposes a Ritz and statistical energy analysis (Ritz-SEA) hybrid method for calculating rectangular plate acoustic vibration coupling in the mid-frequency range for both deterministic and random loads. This method utilizes the fast multi-pole boundary element integral equation and region segmentation mapping as the governing equation for the coupling boundaries. The power flow equation of the statistical energy analysis (SEA) method is incorporated to solve for the average sound pressure level and sound power level of the coupled acoustic cavity. A method that combines the CHIEF and Burton-Miller methods has been proposed to address the issue of non-unique solutions. Validation and parametric studies are conducted. The results demonstrate that this approach can effectively filter out random fluctuations in mid-frequency domains while exhibiting exceptional stability and precision.

基于分段策略的 Ritz 方法以其收敛速度快、能够处理任意边界条件而著称,同时还能保持与基准解法相当的精度。它在计算复合材料层压板、功能分级板和其他新型板材的振动时尤为有效。然而,这种方法在精确计算板结构和声腔之间产生的中频问题时面临挑战。为了填补这一空白,本文提出了一种里兹和统计能量分析(Ritz-SEA)混合方法,用于计算确定性载荷和随机载荷下矩形板在中频范围内的声学振动耦合。该方法利用快速多极边界元积分方程和区域分割映射作为耦合边界的控制方程。统计能量分析(SEA)方法的功率流方程用于求解耦合声腔的平均声压级和声功率级。还提出了一种结合 CHIEF 和 Burton-Miller 方法的方法,以解决非唯一解的问题。我们进行了验证和参数研究。结果表明,这种方法可以有效过滤中频域的随机波动,同时表现出卓越的稳定性和精确性。


Vibro-acoustic performance of graded piezoelectric metamaterial plates

Schimidt Camila Sanches, de Oliveira Leopoldo Pisanelli Rodrigues, De Marqui Carlos

doi:10.1016/j.compstruct.2023.117656

分级压电超材料板的振动声学性能

This work investigates the vibro-acoustic performance of graded piezoelectric metamaterial plates. The governing equations are presented for an unimorph electromechanically coupled metamaterial plate. A piezoelectric layer with electrodes segmented in a regular lattice is attached over a rectangular, simply-supported panel to realize the electromechanically coupled metamaterial plate, rendering a geometrically periodic structure. The grading is achieved in the electric domain, as each unit cell’s inductive shunt resonant frequency can be tuned independently. We investigate two first-order grading patterns based on linear variations along one and both dimensions of the plate and evaluate their impact on vibration attenuation, sound power, kinetic energy, and acoustic radiation efficiency. The graded metamaterial plates outperform the periodic locally resonant counterparts in vibration and radiated sound power attenuation. Moreover, sound radiation efficiency may increase within the attenuation band for steep grading patterns related to the vibration localization phenomenon. The results show that piezoelectric metamaterial plates with reconfigurable properties are an interesting alternative for enhanced vibro-acoustic performance.

这项研究探讨了分级压电超材料板的振动声学性能。本文给出了单变形机电耦合超材料板的控制方程。为实现机电耦合超材料板,在简单支撑的矩形面板上附着了以规则晶格分割电极的压电层,形成了几何周期性结构。由于每个单元格的电感并联谐振频率可以独立调整,因此可以在电域实现分级。我们研究了基于沿板的一维和两维线性变化的两种一阶分级模式,并评估了它们对振动衰减、声功率、动能和声辐射效率的影响。分级超材料板在振动和辐射声功率衰减方面优于周期性局部谐振板。此外,对于与振动局部化现象有关的陡峭分级模式,声辐射效率可能会在衰减带内提高。研究结果表明,具有可重构特性的压电超材料板是增强振动声学性能的一种有趣的替代方案。


Induction thermography for unidirectional CFRP composites: A novel inspection approach through global current path integration

Kidangan Renil Thomas, Unnikrishnakurup Sreedhar, Krishnamurthy C.V., Balasubramaniam Krishnan

doi:10.1016/j.compstruct.2023.117678

用于单向 CFRP 复合材料的感应热成像技术:通过全局电流路径集成的新型检测方法

In the evolving field of non-destructive testing of composite materials, induction thermography offers significant potential. However, its application to Unidirectional Carbon Fiber Reinforced Polymer (UD CFRP) composites remains challenging due to the unavailability of global current paths. This study introduces a novel methodology to inspect UD CFRP composites using Induction Thermography by incorporating an additional conduction current loop between the composite layers. Initial proof-of-concept experiments were conducted on fiber tow and further validated on laminates. The findings substantiate that the integration of a global current path notably facilitates laminate heating, enhancing the induction thermographic inspection capability. An unexpected discovery in our research is the ability of a circular coil to detect fiber breakage in a laminate that is nearly an order of magnitude wider than the coil diameter, thus demonstrating the approach’s high sensitivity. The practical applicability of the proposed methodology was demonstrated using an external fixture. Moreover, this work proposes an innovative modification to the manufacturing process of non-crimp textiles by incorporating a conductive thread, envisaged to bolster the induction thermographic inspection efficiency further. Numerical modeling, closely aligning with experimental observations, provides a robust theoretical foundation for our work.

在不断发展的复合材料无损检测领域,感应热成像技术具有巨大的潜力。然而,由于无法获得全局电流路径,将其应用于单向碳纤维增强聚合物(UD CFRP)复合材料仍具有挑战性。本研究介绍了一种使用感应热成像技术检测 UD CFRP 复合材料的新方法,即在复合材料层之间增加一个传导电流回路。在纤维丝束上进行了初步概念验证实验,并在层压板上进行了进一步验证。研究结果证明,整合全电流路径可显著促进层压板加热,增强感应热成像检测能力。我们研究中的一个意外发现是,圆形线圈能够检测到比线圈直径宽近一个数量级的层压板中的纤维断裂,从而证明了该方法的高灵敏度。使用外部夹具证明了所建议方法的实际适用性。此外,这项研究还提出了一种创新的方法,即在非卷曲纺织品的制造过程中加入导电线,以进一步提高感应热成像检测的效率。数值建模与实验观察紧密结合,为我们的工作提供了坚实的理论基础。


Impacts of nanofiller shapes on the interface confinement effect in polymer nanocomposites

Wang Guotong, Wang Ruijie, Wang Liya, Wang Chengyuan, Zhang Faling, Wang Ziyu, Tang Chun

doi:10.1016/j.compstruct.2023.117679

纳米填料形状对聚合物纳米复合材料界面约束效应的影响

Shape effect of nanofillers (NFs) on the properties of nanocomposites has attracted considerable attention in recent research. The present study aims to examine how NF shapes influence the confinement effect of polymer-NF interface on the physical properties of nearby polymer (the interphase). Herein molecular dynamics simulations are performed to capture the shift of interphase properties when NFs change from nanosphere to nanocylinder and nanofilm geometry. A stress analysis is then carried out in the interphase to identify a key parameter for characterizing the stress-property coupling and revealing the pathway of the NF shapes to impact the interphase properties. It is shown that the peak hydrostatic stress σ_hyd quantifies the effect of internal stresses on the properties of the interphase. Specifically, the shape transition considered can substantially enhance the peak σ_hyd by flattening the stress space in the interphase without largely affecting the polymer-NF interaction. Increased peak σ_hyd in turn upshifts the interphase properties and thus, leads to the coupling between the NF shapes and interface confinement effect.

纳米填料(NFs)的形状对纳米复合材料性能的影响在最近的研究中引起了广泛关注。本研究旨在探讨 NF 的形状如何影响聚合物-NF 界面对附近聚合物(相间)物理性质的约束效应。本文通过分子动力学模拟来捕捉 NF 从纳米球到纳米圆柱和纳米薄膜几何形状变化时相间特性的变化。然后在相间进行应力分析,以确定表征应力-性能耦合的关键参数,并揭示 NF 形状影响相间性能的途径。结果表明,静水压力峰值 σ_hyd 可以量化内应力对相间特性的影响。具体来说,所考虑的形状转变可通过平整相间层中的应力空间来大幅提高峰值 σ_hyd,而不会在很大程度上影响聚合物-NF 的相互作用。σ_hyd峰值的增加反过来又会提高相间特性,从而导致无纺布形状与界面约束效应之间的耦合。


Composites Part A: Applied Science and Manufacturing

MOF derived NiFe@C composites with controllable multi-dimensional microstructures for broadband microwave absorption

Liu Bo, Feng Mengfei, Liang Biao, Xiao Junjie, Feng Mengfei, Cheng Hui, Li Yuan, Cheng Yi, Zhang Kaifu

doi:10.1016/j.compositesa.2023.107869

具有可控多维微结构的 MOF 衍生 NiFe@C 复合材料用于宽带微波吸收

Metal-organic framework (MOF) derivatives exhibit great potential as microwave absorbing materials (MAMs) owing to their high porosity, abundant surface sites and tunable constituents. Herein, this paper proposed “Efficient microstructure controllable strategy” for synthesizing thin-thickness broadband MAMs named NiFe@C by regulating its material microstructure. NiFe-MOF-74 precursors were firstly prepared through solvothermal method. By controlling the supersaturation of precursors, three kinds of microstructures were obtained: 3-dimensional lotus-like nanorods self-assembled structure, 1-dimensional nanospheres/nanorods hybrid structure, and 0-dimensional nanospheres structure. Subsequently, NiFe@C derivatives were obtained by pyrolysis, inheriting the microstructures of NiFe-MOF-74. The lotus-like structure of NiFe@C achieves an effective absorption bandwidth (reflection loss < -10 dB) of 5.09 GHz (12.91-18.00 GHz) with thickness of only 1.6 mm, while the nanospheres structure of NiFe@C exhibits the maximum absorptance of 99.96% at 17.12 GHz with thickness of 2.3 mm. This work provides a facile direction for designing thin thickness MAMs with broadband microwave absorption capability.

金属有机框架(MOF)衍生物具有高孔隙率、丰富的表面位点和可调控的成分,因此作为微波吸收材料(MAM)具有巨大的潜力。本文提出了 "高效微结构可控策略",通过调节材料的微结构来合成名为 NiFe@C 的薄厚度宽带微波吸收材料。首先通过溶热法制备了 NiFe-MOF-74 前驱体。通过控制前驱体的过饱和度,获得了三种微观结构:三维莲花状纳米棒自组装结构、一维纳米球/纳米棒混合结构和零维纳米球结构。随后,通过热解得到了 NiFe@C 衍生物,继承了 NiFe-MOF-74 的微观结构。莲花状结构的 NiFe@C 在厚度仅为 1.6 毫米的情况下实现了 5.09 GHz(12.91-18.00 GHz)的有效吸收带宽(反射损耗小于 -10dB),而纳米球结构的 NiFe@C 在厚度为 2.3 毫米的情况下在 17.12 GHz 频率下的最大吸收率为 99.96%。这项工作为设计具有宽带微波吸收能力的薄厚度 MAM 提供了一个便捷的方向。


Composites Part B: Engineering

Mechanical properties and failure mechanisms of all-CFRP corrugated sandwich truncated cone

Li Zhibin, Wang Wenyu, Xue Pengcheng, Wei Xingyu, Xiong Jian

doi:10.1016/j.compositesb.2023.111090

 

全-CFRP 波纹夹层截顶锥的机械性能和失效机理

Cone-shaped sandwich structures are extensively employed in various fields due to their excellent bearing efficiency and designability. In this work, the design approach and integrated manufacturing method for the carbon fiber reinforced plastic (CFRP) corrugated sandwich truncated cone (CSTC) are proposed to improve the anti-debonding ability and ensure the reliability of the sandwich cone. First, the theoretical model for the stiffness of the CSTC is derived, in which the conservative prediction and the upper limit considering the fiber orientation of the cone are derived. The multiple failure modes of the CSTC under axial compression are theoretically established. Then, the failure mechanism map of the CSTC is established to forecast the possible failure modes. The typical failure modes of local buckling, face fracture, and core buckling are captured by experiments and finite element analysis (FEA). The theoretical model of the stiffness and failure modes is verified by the experiments and FEA. The effect of the semi-vertex angle and circumferential cell number on the failure modes is revealed. Furthermore, a more comprehensive failure mechanism map was generated by altering the geometric parameters of the CSTC. The failure modes of Euler buckling and global buckling are acquired by the comprehensive failure mechanism map and verified by FEA. Finally, the optimum design of the CSTC structure was performed. The results show that the failure mode of face fracture has the best bearing efficiency. This research provides a solid foundation for designing and applying lightweight CSTCs in constructions, such as the adapter of launch vehicles.

锥形夹层结构因其优异的承载效率和可设计性被广泛应用于各个领域。本文提出了碳纤维增强塑料(CFRP)波纹夹层截顶锥体(CSTC)的设计方法和集成制造方法,以提高夹层锥体的抗脱粘能力,确保其可靠性。首先,推导了 CSTC 刚度的理论模型,其中考虑了锥体的纤维取向,得出了保守预测值和上限值。从理论上确定了 CSTC 在轴向压缩下的多种失效模式。然后,建立了 CSTC 的失效机理图,以预测可能的失效模式。通过实验和有限元分析(FEA)捕捉到了局部屈曲、端面断裂和核心屈曲等典型失效模式。实验和有限元分析验证了刚度和失效模式的理论模型。半顶角和圆周单元数对失效模式的影响得到了揭示。此外,还通过改变 CSTC 的几何参数生成了更全面的失效机理图。通过综合失效机理图获得了欧拉屈曲和全局屈曲的失效模式,并通过有限元分析进行了验证。最后,对 CSTC 结构进行了优化设计。结果表明,面断裂失效模式具有最佳承载效率。这项研究为轻质 CSTC 在运载火箭适配器等结构中的设计和应用奠定了坚实的基础。


Composites Science and Technology

High thermal conductive polyurethane composite films with a three-dimensional boron nitride network in-situ constructed by multi-folding and multi-laminating

Yang Lide, Huang Rutao, Yuan Jianmin, Zhang Pingan, Deng Jianru, Li Qiang

doi:10.1016/j.compscitech.2023.110326

 

通过多重折叠和多重层压在原位构建具有三维氮化硼网络的高导热聚氨酯复合薄膜

Based on the chemical modifications of the few-layer boron nitride nanosheets (BNNSs) prepared by ball milling, several BNNS/polyurethane (PU) composite films (non-laminated films) were prepared by solution blending. It showed that the modified BNNSs (M-BNNSs) in PU matrices assembled into boron nitride (BN) micro-flakes and mildly orientated along the film planes. Then, an approach of multi-folding and multi-laminating further promoted the orientation, stacking and connection of BN micro-flakes, by which a three-dimensional (3D) BN network composed of lamellar BN skeleton and a small number of BN linkers was in-situ constructed in the PU composite films (laminated films). For the existence of a continuous heat conductive channel based on the 3D BN network, the thermal conductivities (TCs) of the laminated films were obviously enhanced compared to the corresponding non-laminated films. The incorporation of M-BNNSs further improved the electrical insulation of the laminated films. When the M-BNNS content was 50 wt%, the in-plane TC of the laminated film reached 23.80 W/m·K. The laminated film with M-BNNS content of 30 wt% showed high TC, good flexibility, and outstanding electrical insulation, who is a promising candidate for the flexible thermal management materials.

在对球磨法制备的几层氮化硼纳米片(BNNSs)进行化学修饰的基础上,通过溶液混合法制备了几种氮化硼纳米片/聚氨酯(PU)复合膜(非层压膜)。研究表明,聚氨酯基质中的改性 BNNSs(M-BNNSs)组装成了氮化硼(BN)微片,并沿薄膜平面温和取向。然后,多重折叠和多重层压的方法进一步促进了氮化硼微薄片的取向、堆叠和连接,从而在聚氨酯复合薄膜(层压薄膜)中原位构建了由片状氮化硼骨架和少量氮化硼连接体组成的三维(3D)氮化硼网络。由于基于三维 BN 网络的连续导热通道的存在,与相应的非层压薄膜相比,层压薄膜的导热系数(TCs)明显提高。M-BNNS 的加入进一步提高了层压薄膜的电绝缘性。当 M-BNNS 含量为 50 wt% 时,层压薄膜的面内 TC 达到 23.80 W/m-K。M-BNNS 含量为 30 wt% 的层压薄膜具有较高的 TC 值、良好的柔韧性和出色的电绝缘性能,是柔性热管理材料的理想候选材料。



来源:复合材料力学仿真Composites FEM
ACTMechanicalAdditive振动断裂复合材料化学ADSCONVERGE声学理论材料分子动力学纺织
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【新文速递】2023年10月12日复合材料SCI期刊最新文章

今日更新:Composite Structures 9 篇,Composites Part A: Applied Science and Manufacturing 1 篇,Composites Science and Technology 2 篇Composite StructuresHigh performance shape-adjustable structural lithium-ion battery based on hybrid fiber reinforced epoxy compositeMao Yu-Qin, Dong Guang-He, Fu Yu-Tong, Li Yuan-Qing, Huang Pei, Fu Shao-Yundoi:10.1016/j.compstruct.2023.117598基于混合纤维增强环氧树脂复合材料的高性能形状可调结构锂离子电池High performance shape-adjustable structural batteries with both excellent electrochemical performances and mechanical properties, and compatible with conventional batteries and composite processing techniques, are highly attractive for next generation electrical vehicles and electrical aircrafts. Herein, a high-performance structural lithium-ion battery composite (SLBC) is developed by encapsulating commercial-available battery core materials with hybrid fiber reinforced epoxy composite laminate shells, which can be assembled into desired irregular shapes with the conventional vacuum bagging technique. Firstly, the laminate shell layout with the combination of glass fiber woven fabric (GFWF) and carbon fiber woven fabric (CFWF) is designed and optimized. Meanwhile, a PET film is employed to wrap the battery core materials, which enables processing of the SLBC with liquid electrolyte in ambient condition. The SLBC obtained demonstrates both prominent mechanical (flexural strength of 211.7 MPa and flexural modulus of 7.7 GPa) and electrochemical properties (an initial discharge capacity of 98.5 mAh g-1 at 0.2 C, a high energy density of 314.5 Wh kg-1, and a good cycling performance) owing to the hybrid design of CFWF and GFWF as well as a sealed environment to guarantee the battery operate well. Impressively, the in-situ mechano-electrochemical measurements are assessed under the out-of-plane compressive stress and the flexural stress conditions. These results show that the SLBC under loading can maintain stable electrochemical performance even at a high out-of-plane compressive stress of 20 MPa and a high flexural stress of 150 MPa. Furthermore, the SLBC can also maintain the excellent discharge capacity when subjected to a high impact energy, which is promising in next generation electrical vehicles. Finally, the wave-like SLBC fabricated demonstrates the effectiveness in withstanding loads and driving electric fan simultaneously, which is promising in next generation electrical vehicles.可调整形状的高性能结构电池既具有优异的电化学性能和机械性能,又与传统电池和复合材料加工技术兼容,对下一代电动汽车和电动飞机极具吸引力。本文开发了一种高性能结构锂离子电池复合材料(SLBC),将商用电池芯材料与混合纤维增强环氧树脂复合材料层压板壳体封装在一起,可通过传统的真空装袋技术组装成所需的不规则形状。首先,设计并优化了玻璃纤维编织物(GFWF)和碳纤维编织物(CFWF)组合的层压外壳布局。同时,采用 PET 薄膜包裹电池芯材料,使 SLBC 能够在环境条件下与液态电解液一起加工。由于 CFWF 和 GFWF 的混合设计以及密封环境保证了电池的良好运行,因此获得的 SLBC 具有突出的机械性能(抗弯强度为 211.7 MPa,抗弯模量为 7.7 GPa)和电化学性能(0.2 C 下的初始放电容量为 98.5 mAh g-1,能量密度高达 314.5 Wh kg-1,循环性能良好)。令人印象深刻的是,在面外压缩应力和弯曲应力条件下对原位机械电化学测量进行了评估。这些结果表明,即使在 20 兆帕的高平面外压应力和 150 兆帕的高弯曲应力条件下,加载中的 SLBC 仍能保持稳定的电化学性能。此外,SLBC 在承受高冲击能量时也能保持出色的放电能力,这在下一代电动汽车中大有可为。最后,制造出的波浪状 SLBC 在承受负载的同时还能有效驱动电风扇,这在下一代电动汽车中大有可为。Influence of projectile physical state on ballistic energy absorption capacity of UHMWPE laminate: Experiment and SimulationHe Yemao, Jiao Yanan, Qing Zhou Johnny, Zhang Diantang, Lei Hongshuai, Chen Lidoi:10.1016/j.compstruct.2023.117607弹丸物理状态对超高分子量聚乙烯层压板弹道能量吸收能力的影响:实验与模拟This paper presents the influence of projectile physical state on ballistic energy absorption capacity of UHMWPE laminate. Specifically, standard fragment simulating projectile (FSP) and 7.62 mm × 39 mm mild steel core projectile (MSCP) are utilized to perforate two kinds of areal density laminate. Internal damage morphologies of post-impact laminate are characterized via X-ray computer tomography (CT). A sub-laminate discretization approach was used to establish numerical laminate model, and decoupling parametric studies of projectile state were performed. Results of ballistic tests show that ballistic energy absorption capacity of laminate depends on projectile state and laminate areal density. Multi scale damage morphologies analysis indicate that shear fracture and multi-layer delamination failure are the primary failure modes of post-impact laminate, which were in good agreement with simulation results. Results of parametric studies suggest that high-speed spin of projectile will cause torsional deformation of laminate.本文研究了弹丸物理状态对超高分子量聚乙烯层压板弹道能量吸收能力的影响。具体而言,本文使用标准碎片模拟弹丸(FSP)和 7.62 mm × 39 mm 低碳钢芯弹丸(MSCP)击穿两种等密度层压板。冲击后层压板的内部损伤形态通过 X 射线计算机断层扫描(CT)进行表征。采用子层压离散化方法建立了数值层压模型,并对弹丸状态进行了解耦参数研究。弹道试验结果表明,层压板的弹道能量吸收能力取决于弹丸状态和层压板的等密度。多尺度破坏形态分析表明,剪切断裂和多层分层破坏是冲击后层压板的主要破坏模式,这与模拟结果十分吻合。参数研究结果表明,弹丸的高速旋转会引起层压板的扭转变形。Multi-objective optimization for free vibration of L-shaped bi-functionally graded sandwich plates using an effective finite element method and non-dominated sorting genetic algorithm IIHoa Pham Quoc, Thanh Tran Trung, Zenkour Ashraf M., Nguyen-Thoi Trungdoi:10.1016/j.compstruct.2023.117622利用有效有限元法和非支配排序遗传算法 II 对 L 形双功能分级夹层板的自由振动进行多目标优化Free vibration analysis and multi-objective optimization for L-shaped bi-functionally graded sandwich (L-BFGSW) plates are studied in this work. The L-BFGSW plates are made of three layers including a ceramic core and two face-sheet layers made of two different functionally graded materials (FGMs). For free vibration analysis, an effective C1 finite element formulation based on Shi&#39;s third-order shear deformation plate theory (TSDT) is proposed. For solving the multi-objective optimization, the non-dominated sorting genetic algorithm II (NSGA-II) is utilized to execute the optimization-solving process to acquire Pareto-optimum solutions. These results demonstrate a clear solution for solving the trade-off relationship between the maximum of the first frequency and the minimum of the structural weight.本文研究了 L 型双功能梯度夹层板(L-BFGSW)的自由振动分析和多目标优化。L-BFGSW 板由三层组成,包括陶瓷芯层和由两种不同功能分级材料(FGM)制成的两层面板层。针对自由振动分析,提出了基于 Shi 的三阶剪切变形板理论(TSDT)的有效 C1 有限元公式。为解决多目标优化问题,利用非支配排序遗传算法 II(NSGA-II)执行优化求解过程,以获得帕累托最优解。这些结果表明,在解决第一频率最大值和结构重量最小值之间的权衡关系时,有一个明确的解决方案。Parametric theoretical prediction of elastic properties and strength of fine weave pierced C/C compositesYao Tianlei, Li Diansen, Jiang Leidoi:10.1016/j.compstruct.2023.117614细织穿孔 C/C 复合材料弹性性能和强度的参数理论预测This paper developed a parametric model of fine weave pierced carbon/carbon (FWPCC) composites based on the structural relationship of actual sample information. The elastic constants and compressive strengths of FWPCC composites with various Z-directional yarn contents were parametrically investigated. The developed theoretical prediction model agreed well with the experimental data. The parametric prediction results found Z-directional modulus of FWPCC composites with 6K Z-directional yarns increased by 88.21% compared to FWPCC composites with 1K Z-directional yarns; X/Y-directional modulus decreased by 17.32%; Z-directional compressive strength increased by 337.33%; X/Y-directional compressive strength only decreased by 6.12%. The accuracy of the two failure criteria (Hoffmann, Hashin failure criterion) used for the model was compared. The accuracy of the model prediction using Hashin failure criterion was better than that of the Hoffmann criterion. The predicted results using Hashin criterion also showed that under Z-directional compressive loading, the composite failure was mainly the compressive failure of the Z-directional yarns; under X/Y-directional compressive loading, the composite failure was mainly the compressive failure of the fibers in the bending section in the X/Y-directional yarns. The developed theoretical model was of great significance for the engineering application of C/C composite.本文基于实际样品信息的结构关系,建立了细织穿孔碳/碳(FWPCC)复合材料的参数模型。对不同 Z 向纱线含量的 FWPCC 复合材料的弹性常数和抗压强度进行了参数化研究。所建立的理论预测模型与实验数据吻合良好。参数预测结果发现,与使用 1K Z 向纱的 FWPCC 复合材料相比,使用 6K Z 向纱的 FWPCC 复合材料的 Z 向模量增加了 88.21%;X/Y 向模量降低了 17.32%;Z 向抗压强度增加了 337.33%;X/Y 向抗压强度仅降低了 6.12%。比较了模型使用的两种失效准则(霍夫曼失效准则和哈辛失效准则)的准确性。采用 Hashin 失效准则的模型预测准确性优于 Hoffmann 准则。使用 Hashin 准则预测的结果还表明,在 Z 向压缩载荷作用下,复合材料的破坏主要是 Z 向纱线的压缩破坏;在 X/Y 向压缩载荷作用下,复合材料的破坏主要是 X/Y 向纱线弯曲部分纤维的压缩破坏。所建立的理论模型对 C/C 复合材料的工程应用具有重要意义。In-plane crashing behavior and energy absorption of re-entrant honeycomb reinforced by arched ribsZou Zhen, Xu Fengxiang, Niu Xiaoqiang, Fang Tengyuan, Jiang Zhoushundoi:10.1016/j.compstruct.2023.117615用拱肋加固的重入式蜂窝材料的平面内碰撞行为和能量吸收Arched structures have increased in importance over the last few years due to their high efficiency in bearing loads. This paper introduces arched ribs to the classical re-entrant honeycomb (RH) as reinforced structures, and then its energy absorption is improved by simultaneously utilizing the reinforced structures and the auxetic deformation of RHs. Herein, the in-plane crashing response of reinforced RHs (RRH) under different impact velocities is investigated with finite element methods verified against the quasi-static compression experiment of 3D-printed RRH specimens. By introducing arched structures, the deformation of RHs becomes more stable and regular, and two plateau stresses are produced in the stress-strain curves of RRHs. Benefiting from the stacking deformation of RRHs and pure compression characteristic of catenary arches, the second plateau stress of all-reinforced RHs (ARH) is 3.8 times higher than the first one. Two plateau stresses of ARHs are derivated theoretically with a relative error of less than 7%. Furthermore, a parametric study is performed to explore the effect of impact velocities, thicknesses, and the height of arched ribs on the crashing response of RRHs. The present investigation paves a new way toward strengthening the energy absorption of conventional honeycombs.在过去几年中,弧形结构因其高效的承载能力而日益受到重视。本文在经典的重入式蜂窝(RH)中引入了弧形肋作为增强结构,然后通过同时利用增强结构和 RH 的辅助变形来提高其能量吸收能力。本文采用有限元方法研究了不同撞击速度下增强型 RH(RRH)的平面内碰撞响应,并通过三维打印的 RRH 试样的准静态压缩实验进行了验证。通过引入弧形结构,RRH 的变形变得更加稳定和规则,并且在 RRH 的应力-应变曲线中产生了两个高原应力。得益于 RRH 的堆积变形和导管拱的纯压缩特性,全增强 RH(ARH)的第二个高原应力是第一个应力的 3.8 倍。从理论上推导出 ARH 的两个高原应力,其相对误差小于 7%。此外,还进行了参数研究,以探讨冲击速度、厚度和拱肋高度对 RRH 碰撞响应的影响。本研究为加强传统蜂窝的能量吸收能力铺平了新的道路。Investigation on tearing damage of CFRP circular cell honeycomb in end-face grindingDong Zhigang, Wang Zhenjia, Tian Junchao, Kang Renke, Bao Yandoi:10.1016/j.compstruct.2023.117616端面磨削中 CFRP 圆形蜂窝的撕裂损伤研究CFRP circular cell honeycomb has promising applications in the aerospace field due to its excellent mechanical properties. However, a large number of periodically distributed tearing damages severely restrict the high-quality machining of CFRP circular cell honeycomb. This paper investigates the formation mechanism of tearing damages during end-face grinding of CFRP circular cell honeycomb and proposes suppression strategies. In this paper, a maximum undeformed chip thickness model considering tearing damage distribution is developed, and the evolution behavior of tearing damage is studied by combining the material removal process and grinding force. The grinding force and maximum tearing damage depth in different grinding conditions are analyzed. The results show that the formation of tearing damage in the cut-in stage is related to the weak stiffness of thin walls and the radial grinding force. The radial grinding force and maximum tearing depth can be altered by changing the maximum undeformed chip thickness which can be adjusted for different grinding speeds, feed rates, and offset ratios. The low-damage machining of CFRP circular cell honeycomb can be achieved by using a large offset ratio and variable feed rate.CFRP 圆孔蜂窝材料因其优异的机械性能在航空航天领域有着广阔的应用前景。然而,大量周期性分布的撕裂损伤严重制约了 CFRP 循环蜂窝材料的高质量加工。本文研究了 CFRP 圆孔蜂窝材料端面磨削过程中撕裂损伤的形成机理,并提出了抑制策略。本文建立了考虑撕裂损伤分布的最大未变形切屑厚度模型,并结合材料去除过程和磨削力研究了撕裂损伤的演变行为。分析了不同磨削条件下的磨削力和最大撕裂损伤深度。结果表明,切入阶段撕裂损伤的形成与薄壁的弱刚度和径向磨削力有关。径向磨削力和最大撕裂深度可通过改变最大未变形切屑厚度来改变,而最大未变形切屑厚度可根据不同的磨削速度、进给量和偏置比进行调整。通过使用大偏移比和可变进给率,可实现 CFRP 圆形蜂窝材料的低损伤加工。3D printing microlattice interpenetrating phase composites for energy absorption, damage resistance, and fracture toughnessGuo Xiao, Hu Yuwei, Li Xinwei, Ying Hsi Fuh Jerry, Feng Lu Wendoi:10.1016/j.compstruct.2023.117617三维打印微晶格互穿相复合材料,实现能量吸收、抗损伤和断裂韧性Under external load, lightweight cellular solids are often associated with localized deformation that would lead to their catastrophic failure. Cellular solids are thus often infilled with a soft secondary material, constituting interpenetrating phase composites. Owing to highly interconnected porous architectures and controllable smooth surfaces, the triply periodic minimal surface structures based on interpenetrating phase composites are investigated in this paper. Samples are fabricated via polyjet multi-material printing, with the hard material taking on the primitive lattice and the soft material taking on its inverse. Quasi-static compression and three-point bending tests were performed on the fabricated composites. Results show that the combination of high stiffness, strength, and prolonged smooth plateau stress endows the composites to be promising for lightweight materials and energy absorbers. The designed composites can exhibit an excellent fracture toughness of 0.51MPa•m1/2. Moreover, the designed interpenetrating architectures and stiff-contrast materials intrinsically control the strengthening and toughening mechanisms. The findings presented here demonstrate the potential to obtain enhanced mechanical properties by combining the advantages of the multi-material printing technique and interpenetrated design.在外部载荷作用下,轻质蜂窝状固体往往会产生局部变形,从而导致灾难性的破坏。因此,蜂窝状固体通常会填充柔软的辅助材料,构成互穿相复合材料。由于具有高度互联的多孔结构和可控的光滑表面,本文研究了基于互穿相复合材料的三周期最小表面结构。样品是通过 polyjet 多材料打印技术制作的,其中硬质材料采用原始晶格,软质材料采用其反晶格。对制作的复合材料进行了准静态压缩和三点弯曲试验。结果表明,高刚度、高强度和长期平稳的高原应力使这种复合材料有望成为轻质材料和能量吸收器。所设计的复合材料的断裂韧性高达 0.51MPa-m1/2。此外,所设计的互穿结构和刚性对比材料从本质上控制了增强和增韧机制。本文的研究结果表明,结合多种材料打印技术和穿插设计的优势,有可能获得更高的机械性能。Comments on “Sigmoid functionally graded plates embedded on Winkler-Pasternak foundation: Free vibration analysis by dynamic stiffness method” [Compos. Struct. 288 (2022) 115400]Kumar Raj, Jana Prasundoi:10.1016/j.compstruct.2023.117619关于 &quot;嵌入 Winkler-Pasternak 地基上的西格玛功能分层板:用动态刚度法进行自由振动分析&quot; [Compos.As comments to the paper in Composite Structures 288 (2022) 115400, the present article shows that the mathematical formulation presented for the vibration analysis of sigmoid functionally graded (S-FGM) plates resting on elastic foundation is not correct in its present form. It is shown that the incorrect formulation has resulted in considerable error in the reported results of the paper. In this note, possible mistakes of the mathematical formulation of the paper have been identified, and corrections are proposed.作为对《复合材料结构》(Composite Structures)288 (2022) 115400 号期刊论文的评论,本文指出,针对弹性地基上的西格码功能分级(S-FGM)板振动分析所采用的数学公式目前并不正确。结果表明,不正确的公式导致本文报告的结果存在相当大的误差。本说明指出了论文数学表述中可能存在的错误,并提出了修正建议。Study of the transverse strain effect on the Fiber Bragg Grating Sensor (FBGS) response with polyimide coating under experimental biaxial testsMartínez Vicente J.L, González-Gallego M, Ramírez F Terroba, Frövel M, Cela J.J Lópezdoi:10.1016/j.compstruct.2023.117621在实验性双轴测试中研究横向应变对带有聚酰亚胺涂层的光纤布拉格光栅传感器 (FBGS) 响应的影响The aim of this research work is to study the behaviour of Fiber Bragg Grating (FBG) sensors to interpret their response more accurately in a structural monitoring system. In the presence of a complex stress state, a structure is subjected to strain fields in multiple directions simultaneously and the sensors used for its structural monitoring are affected as well. However, the traditional procedure to calibrate FBG sensors consists of uniaxial tensile tests to calculate a strain sensitivity factor (K) that relates the sensor response to the strain measured during the test. In this study, a polyimide coated FBG sensor is embedded in a cruciform composite specimen to analyse its response to biaxial strain states. The experimental methodology has consisted of carrying out a campaign of biaxial tests on this specimen in which the longitudinal strain (εx) has been kept constant and the transverse strain (εy) has been varied by means of a triaxial testing machine to reproduce different plane stress states. Biaxial tests have allowed to study experimentally the influence of the εy on the longitudinal measurement of the FBG sensor and therefore on the calibration procedure. Finally, the experimental results obtained in both uniaxial and biaxial tests have been compared to the strain-optic theory.这项研究工作的目的是研究光纤布拉格光栅(FBG)传感器的行为,以更准确地解释其在结构监测系统中的响应。在复杂的应力状态下,结构会同时受到多个方向的应变场影响,用于结构监测的传感器也会受到影响。然而,校准 FBG 传感器的传统方法是通过单轴拉伸试验来计算应变灵敏度系数(K)该系数将传感器的响应与测试过程中测得的应变联系起来。本研究将聚酰亚胺涂层 FBG 传感器嵌入十字形复合材料试样中,分析其对双轴应变状态的响应。实验方法包括对该试样进行一系列双轴测试,其中纵向应变 (εx) 保持不变,横向应变 (εy) 通过三轴试验机变化,以再现不同的平面应力状态。通过双轴测试,可以在实验中研究ε y 的影响。εy 对 FBG 传感器纵向测量的影响,因此也影响了校准过程。最后,将单轴和双轴测试中获得的实验结果与应变光学理论进行了比较。Composites Part A: Applied Science and ManufacturingMagnetic field vertically aligned Co-MOF-74 derivatives/polyacrylamide hydrogels with bifunction of excellent electromagnetic wave absorption and efficient thermal conduction performancesCai Jingyu, Zhao Hao, Liu Huan, Wei Yifeng, Zheng Zongrui, Zhang Chunni, Xiao Longqiang, Zhao Rui, Hou Linxidoi:10.1016/j.compositesa.2023.107832磁场垂直排列的 Co-MOF-74 衍生物/聚丙烯酰胺水凝胶具有优异的电磁波吸收和高效的热传导双重性能Developing dual-function materials with efficient electromagnetic wave absorption and good thermal conductivity to achieve excellent packaging of devices has considerable appeal in modern electronic devices. Co-MOF-74 derivatives/polyacrylamide bifunctional gels (PAM-x) were synthesized by magnetic field assisted technique and in situ radical polymerization. PAM-x showed a minimum reflection loss (RLmin) of -51.6 dB and a maximum effective absorption bandwidth (EAB) of 5.73 GHz at a low filler loading of 5wt%. The magnetic nanoparticles in the MOF derivatives orient the fillers in the polymer matrix under the action of the magnetic field to form an ordered thermal conductivity path, which improves the thermal conductivity perpendicular to the plane direction and helps to promote rapid heat transfer. This work highlights the potential of MOF derivatives/polymers as bifunctional gels, and also provides a reference for the trade-off between electromagnetic wave absorption and thermal conductivity.开发具有高效电磁波吸收和良好导热性能的双功能材料,以实现出色的器件封装,在现代电子设备中具有相当大的吸引力。利用磁场辅助技术和原位自由基聚合法合成了 Co-MOF-74 衍生物/聚丙烯酰胺双功能凝胶(PAM-x)。在填充量为 5wt% 时,PAM-x 的最小反射损耗 (RLmin) 为 -51.6 dB,最大有效吸收带宽 (EAB) 为 5.73 GHz。在磁场的作用下,MOF 衍生物中的磁性纳米粒子使聚合物基体中的填料定向,形成有序的导热路径,从而提高了垂直于平面方向的导热率,有助于促进快速传热。这项工作凸显了 MOF 衍生物/聚合物作为双功能凝胶的潜力,同时也为电磁波吸收和导热性之间的权衡提供了参考。Composites Science and TechnologyMechanically robust, flexible hybrid tactile sensor with microstructured sensitive composites for human-cyber-physical systemsLi Zefu, Wang Shuo, Ding Wenxuan, Chen Yonglin, Chen Meng, Zhang Shujie, Liu Zhuangjian, Yang Weidong, Li Yandoi:10.1016/j.compscitech.2023.110303 采用微结构敏感复合材料的机械坚固柔性混合触觉传感器,适用于人体--计算机--物理系统Advances in human-cyber-physical system (HCPS) requires multiple and multimodal sensory network to address the challenge of human-machine relationships, posing substantial potential for human health monitoring and human-centric smart manufacturing. However, combining electrical sensitivity and mechanical robustness of flexible sensors with simple device structure is still challenging. This work presents a flexible porous bimodal pressure sensor (PBPS) by fabricating 3D microstructured sensitive porous carbon-nanotubes composites (PCNC). The multi-layered PBPS can offer the ability to switch between piezoresistive and piezocapacitive sensing modes without altering the device structure, enhancing mechanical stability of device under loading/unloading cycles. This versatility allows for the detection of hardness discrimination, grabbing sensing, and dynamic human physiological signal recognition, which possess superior pressure sensing performances with a high sensitivity (0.1059 kPa−1 in piezoresistive mode, 0.2054 kPa−1 in capacitive mode), wide measuring range (0–25 kPa), rapid response time (&lt;130 ms in piezoresistive mode, &lt;55 ms in piezocapacitive mode), and long-term durability (&gt;3000 cycles). Furthermore, we proposed mechanical constitutive model to elucidate the sensing mechanism of microstructured PCNC by 3D micro-CT based modeling and experimental data. Finally, we employed multiple PBPSs as sensing elements to real-time monitor 3D printing processing stress, structure assembling stress, and human physiology signals in HCPS, indicating the potential applications of PBPS ranging from monitoring human health to facilitating intelligent manufacturing.人类-网络-物理系统(HCPS)的发展需要多种多模态传感网络来应对人机关系的挑战,这为人类健康监测和以人为本的智能制造带来了巨大潜力。然而,如何将柔性传感器的电灵敏度和机械鲁棒性与简单的设备结构相结合仍是一项挑战。本研究通过制造三维微结构敏感多孔碳纳米管复合材料(PCNC),提出了一种柔性多孔双模压力传感器(PBPS)。多层 PBPS 能够在不改变器件结构的情况下在压阻和压电容传感模式之间切换,从而增强了器件在加载/卸载循环下的机械稳定性。这种多功能性可用于检测硬度辨别、抓取感应和动态人体生理信号识别,具有卓越的压力传感性能,灵敏度高(压阻模式为 0.1059 kPa-1,电容模式为 0.2054 kPa-1),测量范围宽(0-25 kPa),响应时间快(压阻模式小于 130 毫秒,压电模式小于 55 毫秒),长期耐用(大于 3000 次循环)。此外,我们还提出了力学组成模型,通过基于三维微计算机断层扫描的建模和实验数据,阐明了微结构 PCNC 的传感机制。最后,我们采用多个 PBPS 作为传感元件,实时监测 HCPS 中的 3D 打印加工应力、结构装配应力和人体生理信号,这表明 PBPS 具有从监测人体健康到促进智能制造的潜在应用价值。New recyclable and self-healing elastomer composites using waste from toner cartridgesUtrera-Barrios S., Martínez M.F., Mas-Giner I., Verdejo R., López-Manchado M.A., Hernández Santana M.doi:10.1016/j.compscitech.2023.110292 利用硒鼓废料制成的新型可回收和自愈合弹性体复合材料Product recycling reintroduces what is discarded as waste and minimizes the environmental impact on our society. Among the different types of waste from electrical and electronic equipment, toner recycling often falls short, downcycling plastic components. This study introduces an innovative approach in which waste parts from toner cartridges are valorized to develop (recyclable and) self-healing elastomeric composite materials. The synergy between carboxylated nitrile rubber (XNBR) as the elastomeric phase and high-impact poly (styrene) (HIPS) as the thermoplastic phase derived from toner cartridge waste was explored and optimized. This combination resulted in the creation of a thermoplastic elastomer exhibiting robust mechanical properties and self-healing capabilities with a tensile strength of 6.6 ± 0.2 MPa and a temperature-driven mechanical recovery of 100%. Furthermore, the capacity of toner powder, an integral component of waste, to act as a reinforcing filler was confirmed, with a 50% increase in mechanical strength compared with the unfilled composite. Moreover, an increase in toner content (up to 20 phr) resulted in an optimal balance between tensile strength and self-healing capacity, surpassing the traditional antagonism between these properties. As a result, this research opens a new pathway in the field of self-healing composites and suggests a practical and environmentally friendly approach for managing electronic waste, effectively supporting the principles of Circular Economy.产品回收利用可以将废弃物重新回收利用,最大限度地减少对社会环境的影响。在电气和电子设备产生的各类废物中,墨粉盒的回收利用往往不足,塑料部件的循环利用率较低。本研究介绍了一种创新方法,即利用硒鼓中的废弃部件来开发(可回收和)自愈合弹性复合材料。研究探索并优化了羧基丁腈橡胶(XNBR)作为弹性体相与高抗冲聚苯乙烯(HIPS)作为热塑性相之间的协同作用。这种组合造就了一种热塑性弹性体,它具有强大的机械性能和自愈能力,拉伸强度为 6.6 ± 0.2 兆帕,温度驱动的机械恢复能力为 100%。此外,废料中不可或缺的墨粉粉末作为增强填料的能力也得到了证实,与未填充的复合材料相比,其机械强度提高了 50%。此外,墨粉含量的增加(最多 20phr)使拉伸强度和自愈能力达到了最佳平衡,超越了这两种性能之间的传统对立关系。因此,这项研究为自愈合复合材料领域开辟了一条新的道路,并为管理电子废弃物提出了一种实用、环保的方法,有效地支持了循环经济原则。来源:复合材料力学仿真Composites FEM

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