【新文速递】2024年4月28日复合材料SCI期刊最新文章

   

今日更新：Composite Structures 4 篇，Composites Part A: Applied Science and Manufacturing 2 篇，Composites Part B: Engineering 2 篇，Composites Science and Technology 8 篇

Composite Structures

Geometrically nonlinear vibration of toroidal sandwich shells with auxetic honeycomb core under periodic/impulsive pressure

Sayed Mohamad Mirfatah, Hamzeh Salehipour, Ömer Civalek

doi:10.1016/j.compstruct.2024.118166

周期/脉冲压力下带消声蜂窝芯环面夹层壳的几何非线性振动

The main objective of this paper is to evaluate the dynamic behaviour of sandwich toroidal shells composed of a core with negative Poisson ratio (auxetic honeycomb material) and nanocomposite enriched coating layers under impulsive/periodic pressures considering the geometrical nonlinearity. The set of nonlinear equilibrium equations based on the first-order shear deformation theory are and the resultant nonlinear differential motion equations are approximately solved by the Galerkin method and 4th-order Runge–Kutta solution, respectively. The achieved responses show that the amplitude of outward deformations is intensively increased when the proposed sandwich shells are subjected to rectangular periodic and impulsive loadings which shows the destructive effects of this type dynamic loading. The performed parametric studies shows that these destructive effects can be controlled by changing the geometrical properties of the honeycomb cells and the volume fractions of the nanocomposites in the coating layers. It is notable that in the previous studies the nonlinear dynamic response of toroidal shells subjected to various periodic and impulsive pressures was not investigated. However, in the present work, the mentioned dynamic responses were achieved and investigated without spending time-consuming computational. In fact, the novelty of this work is to develop such a robust and efficient tool

本文的主要目的是在考虑几何非线性的脉冲/周期压力下，研究由负泊松比核(负泊松比蜂窝材料)和富含纳米复合材料涂层组成的夹层环面壳的动力特性。基于一阶剪切变形理论的非线性平衡方程组和由此产生的非线性微分运动方程分别用伽辽金法和四阶龙格-库塔解近似求解。得到的响应表明，当所提出的夹层壳受到矩形周期和脉冲加载时，向外变形幅度急剧增加，表明了这种类型动力加载的破坏作用。参数化研究表明，这些破坏效应可以通过改变蜂窝细胞的几何特性和纳米复合材料在涂层中的体积分数来控制。值得注意的是，在以往的研究中，环形壳在不同周期压力和脉冲压力作用下的非线性动力响应没有进行研究。然而，在本工作中，上述动态响应的实现和研究不需要花费大量的计算时间。事实上，这项工作的新颖之处在于开发了这样一个强大而高效的工具

Mechanical behavior of nacre-inspired CFRP composites by 3D printing

Wenfei Peng, Zehui Ge, Yiyu Shao, Longfei Lin, He Li, Moliar Oleksandr

doi:10.1016/j.compstruct.2024.118167

碳纤维增强复合材料的3D打印力学性能

High-performance carbon fiber reinforced polymer (CFRP) composites are essential for many structural applications, however, properties such as strength and toughness are often considered mutually exclusive in CFRP composites. Inspired by the biological structure of nacre, this study offers a new 3D printing strategy for manufacturing nacre-inspired CFRP composites, aiming to overcome the limitations of traditional materials. The geometric parameters of the nacre-inspired brick composites, including waviness angle and aspect ratio were considered to systematically investigate their respective roles in achieving both strength and toughness and reveal the failure and deformation mechanisms through tensile and three-point bending tests. The results indicated the interlocking and appropriate aspect ratio nacre-inspired CFRP composites provides distinct advantages in enhancing both the overall strength and toughness of the structure under tensile loading. It is further shown that the bending property exhibited a significant sensitivity to the waviness angle. As the waviness angle gradually increases from negative to positive, the bending resistance of the sample decreases. The findings regarding deformation, failure modes, and toughening mechanisms shed light on how geometric parameters affect the mechanical performance of the nacre-inspired CFRP composites.

高性能碳纤维增强聚合物(CFRP)复合材料在许多结构应用中是必不可少的，然而，在CFRP复合材料中，强度和韧性等性能通常被认为是相互排斥的。受珍珠层生物结构的启发，本研究提供了一种新的3D打印策略来制造珍珠层启发的CFRP复合材料，旨在克服传统材料的局限性。采用几何参数，包括波纹角和纵横比，系统地研究了它们各自在实现强度和韧性中的作用，并通过拉伸和三点弯曲试验揭示了破坏和变形机制。结果表明，环锁和适当的长径比碳纤维增强复合材料在拉伸载荷下的整体强度和韧性都有明显的优势。进一步表明，弯曲性能对波纹角有显著的敏感性。随着波纹角由负向正逐渐增大，试样的弯曲阻力减小。关于变形、失效模式和增韧机制的研究结果揭示了几何参数如何影响碳纤维增强复合材料的力学性能。

Modified state space method for long-term behavior of viscoelastic laminated angle-ply plate

Junwei Yu, Bin Guan, Bo Sun, Ya Zhang, Kong Yue, Chao Hu, Peng Wu

doi:10.1016/j.compstruct.2024.118151

粘弹性角层合板长期性能的修正状态空间法

This work proposes a modified state space method (SSM) to develop the analytical solution for viscoelastic laminated angle-ply plates subjected to long-term loading situations. Within the analytical model, the plate’s stresses and displacements are governed by orthotropic elasticity theory combined with Boltzmann superposition. The convolution within the governing equation is resolved through the application of Laplace transform. The modified SSM is proposed to provide a general solution for each lamina by extracting the complex variable of the Laplace transform from the state space equation. This modification addresses a limitation of the traditional SSM where the exponential function of the state space matrix is computationally infeasible to calculate. The analytical solution of the laminated angle-ply plate is ultimately derived using the transfer matrix method followed by the inverse Laplace transform. Through comparative analysis, it is observed that the proposed solution exhibits greater accuracy than simplified solutions and higher efficiency compared to the finite element method. In addition, the work explores the bending creep and recovery behaviors of viscoelastic laminated angle-ply plate under various parameters.

本文提出了一种改进的状态空间方法(SSM)，以建立长期加载情况下粘弹性角层合板的解析解。在解析模型中，板的应力和位移由正交各向异性弹性理论结合玻尔兹曼叠加来控制。通过应用拉普拉斯变换求解控制方程内的卷积。通过从状态空间方程中提取拉普拉斯变换的复变量，提出了改进的SSM，以提供每个层的一般解。这种改进解决了传统SSM的一个限制，即状态空间矩阵的指数函数在计算上是不可行的。最后利用传递矩阵法和拉普拉斯逆变换导出了角层合板的解析解。通过对比分析，发现该解比简化解具有更高的精度，比有限元法具有更高的效率。此外，研究了粘弹性角层合板在不同参数下的弯曲蠕变和恢复行为。

Approximate analytical solutions of the 1:3 internal resonance response of piezoelectric energy harvester considering two types of coupled frequency components

Xiaochun Nie, Tao Lin, Dafu Shen, Qingyang Ren, Zhitao Yan, Lingzhi Wang

doi:10.1016/j.compstruct.2024.118159

考虑两种耦合频率分量的压电能量采集器1:3内共振响应的近似解析解

The 1:3 internal resonance effect in the L-shaped piezoelectric vibration energy harvester leads to an expanded frequency band for energy harvesting and better matching of external excitation frequency in the environment. The electromechanical-coupled governing equations for this vibration energy harvester have been validated in our previous work (Nie et al., 2019). The effect of load resistance on the energy harvester’s natural frequency and damping ratio is addressed. The quadratic and cubic nonlinearities in this system leads to two types of coupled frequency components appear, they ultimately affect the approximate solution of the voltage response. The method of multiple scales is used to derive the two types of coupled frequency components of the system along with their contribution to the output responses. The revised approximate analytical solutions of the output responses are then presented. The system’s stability is assessed through the Jacobi matrix of modulation equations. The nonlinear softening phenomenon that favors the broadening of the bandwidth of the energy harvester is analyzed. The vibration patterns in regions with nonlinear softening and non-softening behavior are investigated through frequency spectra, phase trajectories, and Poincaré cross-sections. The findings reveal that the load resistance significantly affects the damping ratio of the harvester. Inclusion of quadratic and cubic nonlinearities results in three frequency components in the output responses spectrum, with an approximate ratio of 1:2:3. Two types of coupled frequency components appeared in the spectrum of the system’s output responses. The contribution of coupled frequency components to the output response proves crucial, and the revised approximate solutions are in good agreement with that of numerical solutions. The output responses are significantly affected by the initial conditions in the nonlinear softening region, the large and small initial conditions yield solutions in the upper and lower branches, respectively.

l型压电振动能量采集器中1:3的内共振效应使得能量采集的频带扩大，与环境中的外部激励频率匹配更好。该振动能量采集器的机电耦合控制方程已在我们之前的工作中得到验证(Nie et al.， 2019)。研究了负载阻力对能量采集器固有频率和阻尼比的影响。该系统的二次非线性和三次非线性导致两类耦合频率分量出现，它们最终影响电压响应的近似解。采用多尺度法推导了系统的两种耦合频率分量及其对输出响应的贡献。然后给出了输出响应的修正近似解析解。通过调制方程的雅可比矩阵来评价系统的稳定性。分析了有利于能量采集器带宽展宽的非线性软化现象。通过频谱、相位轨迹和poincarcarcars截面研究了具有非线性软化和非软化行为区域的振动模式。结果表明，负载阻力对收割机的阻尼比有显著影响。包含二次和三次非线性导致输出响应谱中有三个频率分量，其比例近似为1:2:3。系统输出响应频谱中出现两种耦合频率分量。耦合频率分量对输出响应的贡献被证明是至关重要的，修正后的近似解与数值解吻合得很好。非线性软化区初始条件对输出响应有显著影响，大初始条件和小初始条件分别在上、下分支产生解。

Composites Part A: Applied Science and Manufacturing

Dual-scale numerical analysis of delamination in composite materials with varied fiber orientations at the interface

Anna De Gol, Anna Matveeva, Delphine Carrella-Payan, Larissa Gorbatikh, Mahoor Mehdikhani

doi:10.1016/j.compositesa.2024.108239

 

界面纤维取向不同的复合材料分层的双尺度数值分析

What is the relationship between the fiber orientation at delamination interface and the interlaminar fracture toughness of the composite? The answer is inconclusive based on experimental results. The conflicting observations stem from inconsistencies and inaccuracies in characterization techniques. As an alternative approach to circumvent the experimental challenges, the present study proposes a numerical dual-scale model for delamination, incorporating both micro- and meso-scale features. The model investigates two different fiber orientations at the mid-thickness interface: 0°/0° and 90°/90°. Comparative analyses demonstrate the importance of including a refined region with micromechanics to accurately predict the crack path during delamination. The results exhibit agreement with the literature models and enable estimation of early-initiation fracture toughness, considering delamination interacting with the microstructure while simulating a double cantilever beam specimen with reduced width. The approach provides a deeper understanding of delamination behavior and fracture toughness estimation, contributing to improving composite characterization techniques and design strategies.

分层界面纤维取向与复合材料层间断裂韧性之间的关系是什么?根据实验结果，答案是不确定的。相互矛盾的观察结果源于表征技术的不一致和不准确。作为规避实验挑战的另一种方法，本研究提出了一种结合微观和中尺度特征的分层数值双尺度模型。该模型研究了中厚界面处两种不同的纤维取向:0°/0°和90°/90°。对比分析表明，在分层过程中，包含精细区域的细观力学对于准确预测裂纹路径具有重要意义。在模拟宽度减小的双悬臂梁试样时，考虑分层与微观结构的相互作用，结果与文献模型一致，能够估计早期起裂韧性。该方法提供了对分层行为和断裂韧性估计的更深入理解，有助于改进复合材料表征技术和设计策略。

Impact of additives on the quality of oxide/oxide tow-pregs obtained by continuous fibre impregnation

Zoé Borius, Antoine Débarre, Marc Singlard, Thierry Cutard, Aurélie Julian-Jankowiak

doi:10.1016/j.compositesa.2024.108238

 

添加剂对纤维连续浸渍氧化/氧化双包质量的影响

This paper focuses on the formulation of aqueous alumina slurries compatible with manufacturing alumina/alumina ceramic matrix composite (CMC) by a continuous tow impregnation process. Two hygroscopic organic plasticizers, sorbitol and glycerol, along with a gelling powder, boehmite, are evaluated for their impact on both slurry behaviour and the quality of impregnated tows. The interest of using glycerol instead of sorbitol is demonstrated, as glycerol exhibits smaller impact on slurry viscosity and stability, while being more hygroscopic and plasticizing, enabling a reduction in organic content. Combining glycerol with boehmite powder improves the surface and the tack of impregnated tows, although boehmite increases slurry viscosity and shear-thinning behaviour. Furthermore, thermal degradations of sorbitol and glycerol are studied through thermogravimetric analysis, to define an autoclave curing cycle for each plasticizer removing, to achieve optimal compaction of tow-pregs and hence reduce the porosity of the resulting CMCs.

本文研究了连续浸渍法制备氧化铝/氧化铝陶瓷基复合材料(CMC)的水性氧化铝浆料配方。两种吸湿性有机增塑剂山梨醇和甘油，以及胶凝粉薄水铝石，评估了它们对浆料行为和浸渍拖带质量的影响。使用甘油代替山梨醇的好处是，甘油对浆料粘度和稳定性的影响较小，同时具有更强的吸湿性和塑化性，从而降低了有机含量。将甘油与薄水铝粉结合可以改善浸渍拖带的表面和粘性，但薄水铝粉会增加浆料粘度和剪切减薄性能。此外，通过热重分析研究了山梨醇和甘油的热降解，确定了每次去除增塑剂的高压釜固化周期，以实现最佳的压实，从而减少所得到的cmc的孔隙率。

Composites Part B: Engineering

Superior Strength, Highly Stretchable, Bionic Self-Healing Polyurethane and its Composites for Flexible Conductivity and Self-Cleaning Applications

Yinghu Song, Jialiang Li, Guojun Song, Zhaoji Li, Xirui Yang, Fenglei Ma, Xiaoru Li

doi:10.1016/j.compositesb.2024.111457

 

超强强度，高度可拉伸，仿生自修复聚氨酯及其复合材料的柔性导电性和自清洁应用

Balancing the exceptional mechanical strength and repair efficiency of self-healing materials presents a significant challenge to unlocking their full potential in practical applications. Inspired by natural spider silk and cartilage, multiple dynamic hydrogen bonds were introduced into the pre-prepared polyurethane (PU). Then modifided graphene oxide (GO) nanosheets with dynamic hydrogen bonds were added into the prepared PU to form composites (AU-PU/GDU) to establish a dense hydrogen bond network structure, providing strong interfacial interactions. The AU-PU/GDU film exhibits excellent tensile strength (39.6 MPa), high elongation at break (1155.6%), and outstanding repair efficiency (90.3%). Using AU-PU/GDU as the flexible base, a superhydrophobic conductive composite coating (F-AU-PU/GDU) with a contact angle greater than 150° was prepared by incorporating superhydrophobic nanomaterials. This work lays the foundation for the development of multifunctional materials through the creation of self-healing superhydrophobic conductive composite coatings, which have a wide range of potential applications.

平衡自愈材料的特殊机械强度和修复效率是释放其在实际应用中的全部潜力的重大挑战。受天然蜘蛛丝和软骨的启发，预先制备的聚氨酯(PU)中引入了多个动态氢键。将具有动态氢键的改性氧化石墨烯(GO)纳米片加入到制备的PU中，形成复合材料(AU-PU/GDU)，建立致密的氢键网络结构，提供强的界面相互作用。AU-PU/GDU薄膜具有优异的抗拉强度(39.6 MPa)、高断裂伸长率(1155.6%)和优异的修复效率(90.3%)。以AU-PU/GDU为柔性基，通过加入超疏水纳米材料，制备了接触角大于150°的超疏水导电复合涂层(F-AU-PU/GDU)。这项工作为通过创建自修复超疏水导电复合涂层开发多功能材料奠定了基础，具有广泛的潜在应用前景。

Hybrid additive manufacturing of aluminum matrix composites with improved mechanical properties compared to extruded counterparts

H. Zeng, F.C. Liu, S.Z. Zhu, Q.Z. Wang, Y.D. Wang, P. Xue, L.H. Wu, H. Zhang, D.R. Ni, B.L. Xiao, Z.Y. Ma

doi:10.1016/j.compositesb.2024.111497

混合增材制造的铝基复合材料与挤压相比较，具有更好的机械性能

Great difficulties existed in fabricating large components of SiC particles reinforced aluminum matrix composites with excellent mechanical properties using existing manufacturing procedures. This study demonstrated that the challenges can be addressed by developing a hybrid solid-state additive manufacturing method. The influence of the deposition procedures and the post-processing heat treatment on the microstructure and mechanical properties of the SiC particles reinforced 2009 aluminum ally matrix composites (SiCp/2009Al composites) was systematically investigated using advanced technologies such as spherical aberration corrected transmission electron microscope, atom probe tomography, etc. The results showed that the SiCp/2009Al composites produced by the hybrid solid-state additive manufacturing exhibited enhanced tensile properties and improved isotropy in mechanical properties compared to the extruded feedstock of SiCp/2009Al composites. This was attributed to the formation of dense metal with uniformly distributed SiC particles, high-density of Cu-Mg co-clusters, refined grains and SiC particles, low deformation texture, tightly bonded SiCp/2009Al interface, and sound interfacial bonding between deposited layers.

采用现有的制造工艺，制备具有优异力学性能的碳化硅颗粒增强铝基复合材料存在较大的困难。这项研究表明，可以通过开发一种混合固态增材制造方法来解决这些挑战。采用球面像差校正透射电镜、原子探针层析成像等先进技术，系统研究了沉积工艺和后处理热处理对SiC颗粒增强2009铝基复合材料(SiCp/2009Al复合材料)显微组织和力学性能的影响。结果表明:与挤压成型的SiCp/2009Al复合材料相比，复合材料的拉伸性能得到增强，力学性能各向同性得到改善;这是由于形成了致密的SiC颗粒分布均匀的金属，Cu-Mg共团簇高密度，晶粒和SiC颗粒细化，变形织构低，SiCp/2009Al界面结合紧密，沉积层间界面结合良好。

Composites Science and Technology

Sweat and Microwave Manageable Textiles for Efficient Personal Thermal Comfort and Electromagnetic Radiation Defend

Duo Xu, Can Ge, Chong Gao, Qian Zhang, Ze Chen, Yingcun Liu, Keshuai Liu, Weilin Xu, Jian Fang

doi:10.1016/j.compscitech.2024.110622

 

汗水和微波管理纺织品，有效的个人热舒适和电磁辐射防御

Although electromagnetic interference (EMI) shielding fabrics integrated with absorption and reflection have recently shown attractive defense performance, effective sweat management is still scarce for simultaneously achieving sustainable personal comfort. Here, we demonstrate a hierarchically arrayed fabric for personal EMI shielding and thermal comfort management. By integrating EMI shielding interfaces and spatially distributed channels, the fabric exhibits high-efficiency EMI shielding ability and enhanced sweat transportation. We demonstrate the tuning electromagnetic response with maximum EMI shielding efficiency value of ∼118 dB and continuous one-way liquid sweat flow with a temperature of ∼3.5 °C lower than that of conventional EMI shielding fabrics. In addition, the fabric shows substantially stabilized EMI shielding performance for long-term use by transporting and repelling internal liquid sweat. The high performance of our fabric makes it a promising design paradigm for personal electromagnetic interference shielding and thermal management.

虽然电磁干扰(EMI)屏蔽织物集成吸收和反射最近显示出诱人的防御性能，有效的汗水管理仍然是稀缺的，同时实现可持续的个人舒适。在这里，我们展示了一种用于个人电磁干扰屏蔽和热舒适管理的分层排列织物。通过集成电磁干扰屏蔽接口和空间分布通道，织物具有高效的电磁干扰屏蔽能力和增强的汗水输送能力。我们展示了调谐电磁响应，最大电磁干扰屏蔽效率值为~ 118 dB，连续单向液汗流温度比传统电磁干扰屏蔽织物低~ 3.5°C。此外，该织物通过输送和排斥内部液体汗液，显示出长期使用的稳定的电磁干扰屏蔽性能。我们的高性能织物使其成为个人电磁干扰屏蔽和热管理的有前途的设计范例。

Evaluation of Matrix Crack Growth in Interlaminar Toughened Quasi-isotropic Carbon-Fiber Reinforced Plastic Laminates up to the Very-high Cycle Regime by Ultrasonic Fatigue Testing

Yuki Nishi, Atsushi Hosoi, Hiroyuki Kawada

doi:10.1016/j.compscitech.2024.110623

 

基于超声疲劳试验的层间增韧准各向同性碳纤维增强塑料层合板基体裂纹扩展研究

It is time-consuming to conduct conventional hydraulic fatigue testing up to the very-high cycle fatigue (VHCF, N (number of cycles)  108) regime. Ultrasonic fatigue testing has been proposed as an accelerated alternative method. In this study, ultrasonic fatigue testing was conducted on interlaminar toughened quasi-isotropic carbon-fiber reinforced plastic (CFRP) laminates to evaluate the characteristics and mechanism of fatigue up to the VHCF regime. Hydraulic fatigue tests were conducted at the same stress ratio as a comparison. The resulting S–N diagrams showed a lower fatigue strength and different fatigue mechanisms for specimens subjected to ultrasonic fatigue tests compared with those subjected to hydraulic fatigue tests. The observed growth of the matrix crack density in each laminate layer was used to perform a shear-lag analysis to calculate the energy release rate considering off-axis matrix cracks. The results suggested different damage growth behaviors for specimens subjected to ultrasonic and conventional fatigue tests.

常规液压疲劳试验在高周疲劳(VHCF, N(循环次数)108)工况下进行是非常耗时的。超声疲劳试验已被提出作为一种加速的替代方法。本研究对层间增韧准各向同性碳纤维增强塑料(CFRP)层合板进行了超声疲劳试验，以评价其达到VHCF状态的疲劳特性和机理。在相同的应力比下进行了水力疲劳试验作为对比。结果表明，超声疲劳试验与水力疲劳试验相比，试样的疲劳强度更低，疲劳机制也不同。利用观察到的每层基体裂纹密度的增长进行剪切滞后分析，计算考虑离轴基体裂纹的能量释放率。结果表明，超声疲劳试验和常规疲劳试验的损伤扩展行为不同。

A mapping-based method capturing the mesoscopic morphological characteristics of 3D woven fabric torsion structures

Hao Li, Qirui Jin, Zengfei Liu, Chuang Ma, Jingran Ge, Yichao Zhu, Jun Liang

doi:10.1016/j.compscitech.2024.110630

 

一种基于映射的方法捕捉三维机织织物扭转结构的介观形态特征

Upon torsional molding, 3D woven fabrics accommodate a complex mesoscopic morphology that significantly governs the mechanical properties of composite structures. This paper is aimed to propose a macro-mesoscopic mapping method for characterizing the mesoscopic morphology of 3D woven fabric torsion structures. To this end, hyperelastic constitutive molding simulations of fabrics are performed to determine the macroscopic deformation profile within the structure in first. Then the mesoscopic details are resolved with the unit cell deformed accordingly at each digital element. A macro-mesoscopic mapping relationship is thus established by constructing a multiscale topological description function so as to tune the mesoscopic unit cells in consistency with the macroscopic manifold. Finally, the collection of mapping data is utilized for geometric reconstruction, establishing a mesoscale geometrically refined descriptive model about the torsion structure. The mesoscopic morphology of the reconstructed model is shown to agree well with experimental results. Moreover, the mapping method offers a significant time-saving strategy as the calculation time is only within a few minutes on a personal computer, in comparison with existing treatments necessitating 2-day computation on a workstation against similar tasks. The applicability of the present method to resolve other multiscale manifolds is also demonstrated.

在扭转成型后，3D机织织物适应复杂的介观形态，显着控制复合结构的机械性能。本文旨在提出一种宏观介观映射方法来表征三维机织物扭转结构的介观形态。为此，首先对织物进行了超弹性本构成型模拟，确定了织物在结构内部的宏观变形分布。然后通过在每个数字单元上进行相应变形的单元格来解析细观细节。通过构造多尺度拓扑描述函数，建立宏观-介观映射关系，使介观单元胞与宏观流形保持一致。最后，利用收集到的映射数据进行几何重建，建立扭转结构的中尺度几何精细描述模型。重建模型的介观形貌与实验结果吻合较好。此外，映射方法提供了一个显著的节省时间的策略，因为计算时间在个人计算机上只有几分钟，而现有的处理方法需要在工作站上进行2天的计算。该方法同样适用于求解其他多尺度流形。

A novel organic-inorganic two-dimensional filler for composite coating with excellent mechanical and high-pressure CO2 anti-corrosion performance

Qianqian Yin, Chijia Wang, Yize Liu, Shuyi Liu, Jianxin Wang, Weihao Fan, Xueqing Wang, Huaiyuan Wang

doi:10.1016/j.compscitech.2024.110631

 

一种新型复合涂层用有机-无机二维填料，具有优异的机械性能和抗高压CO2腐蚀性能

organic-inorganic composite fillers were successfully prepared by a simple one-pot film-like coating of poly(α-cyanoethyl acrylate) (PECA) on mica. Scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FT-IR), and thermogravimetric analysis (TG) were used to analyze the structure, morphology, and chemical composition of the organic-inorganic composite filler and pure mica in detail. The organic-inorganic composite filler was added to epoxy resin to prepare a composite coating with long-lasting anti-corrosion and wear-resistance properties. The composite coating was characterized by electrochemical impedance spectroscopy (EIS), high-pressure CO2 corrosion tests, friction performance tests, differential scanning calorimetry (DSC), and adhesion performance tests. The mechanical test results showed that the average wear quality of the EP/P30&M(8/2) composite coating prepared with the modified filler was reduced to 65.7% of that of the EP/MICA(8/2) coating. The addition of the modified filler to the coating substantially improved the wear resistance and crosslinking of the composite coating, reduced the porosity, increased the density, and effectively improved the overall performance of the composite coating. The results of high-pressure CO2 corrosion tests in harsh environments and electrochemical impedance spectroscopy showed that the composite coating had excellent barrier capacity. After high-pressure CO2 corrosion tests, the EP/P20&M(9/1) composite coating still has a high impedance modulus value of 6.348×1010 Ω/cm2 at 0.01 Hz, which is 5 orders of magnitude higher than that of the pure epoxy coating, and showsed excellent long-lasting corrosion resistance in EIS tests. This study provides new ideas for the industrial application of mica and the preparation of long-lasting anti-corrosion coatings.

通过在云母表面涂覆聚α-氰基丙烯酸乙酯(PECA)，制备了有机-无机复合填料。采用扫描电镜(SEM)、傅里叶变换红外光谱(FT-IR)和热重分析(TG)对有机-无机复合填料和纯云母的结构、形貌和化学成分进行了详细分析。在环氧树脂中加入有机-无机复合填料，制备了具有持久防腐耐磨性能的复合涂层。通过电化学阻抗谱(EIS)、高压CO2腐蚀测试、摩擦性能测试、差示扫描量热法(DSC)和粘附性能测试对复合涂层进行了表征。力学性能测试结果表明，改性填料制备的EP/P30&M(8/2)复合涂层的平均磨损质量降低到EP/MICA(8/2)涂层的65.7%。在涂层中加入改性填料后，复合涂层的耐磨性和交联性大幅提高，孔隙率降低，密度增加，有效提高了复合涂层的整体性能。在恶劣环境下进行的高压CO2腐蚀试验和电化学阻抗谱分析结果表明，复合涂层具有优异的阻隔性能。经过高压CO2腐蚀试验，EP/P20&M(9/1)复合涂层在0.01 Hz下仍具有较高的阻抗模值6.348×1010 Ω/cm2，比纯环氧涂层提高了5个数量级，并在EIS试验中表现出优异的持久耐蚀性。该研究为云母的工业应用和长效防腐涂料的制备提供了新的思路。

Mechanical static and dynamic damping performance of architected epoxy-ceramic interpenetrating phase composites

Agyapal Singh, Nikolaos Karathanasopoulos

doi:10.1016/j.compscitech.2024.110632

 

体系结构环氧树脂-陶瓷互穿相复合材料的力学静态和动态阻尼性能

The current contribution investigates the engineering of high strength, ductility and damping interpenetrating phase composites (IPCs), incorporating architected brittle ceramic reinforcement phases in epoxy and whisker-enhanced epoxy matrices. Initially, the mechanical performance of the underlying, ceramic, single-phase triply periodic minimal surface (TPMS) and spinodal metamaterial reinforcement phase designs is assessed, quantifying volume fraction and architecture effects. Ceramic-epoxy IPCs yield more than 30 times higher peak stress values compared to single-phase ceramic metamaterials, providing an overall ductile rather than brittle response, with substantial strength and deformation capacity. Moreover, whisker-enhanced IPC designs furnish considerable improvements in the peak strength and post-elastic performance of epoxy-ceramic IPCs, furnishing exceptional Specific Energy Absorption (SEA) attributes, up to 18.5 J/g. The effect of the reinforcement phase design is more prominent at lower volumetric contents, leading to considerable differences in strength and energy absorption characteristics. Failure is controlled by the maximum principal stress capacity of the ceramic reinforcement phase, as revealed by dedicated finite element analysis. The remarkable static attributes are combined with outstanding dynamic damping characteristics. The maximum dynamic loss modulus is controlled by the reinforcement phase type and volumetric content, exceeding 500 MPa at 55 Hz for spinodal-based, 30% ceramic volume fraction IPCs, values that outperform the damping capacity of most comparable-strength materials.

目前的贡献是研究高强度、延展性和阻尼互穿相复合材料(IPCs)的工程，在环氧树脂和晶须增强环氧树脂基体中加入结构脆性陶瓷增强相。首先，评估了底层、陶瓷、单相三周期最小表面(TPMS)和spinodal超材料增强相设计的力学性能，量化了体积分数和结构效应。与单相陶瓷超材料相比，陶瓷环氧IPCs的峰值应力值高出30倍以上，提供了整体的延展性而不是脆性响应，具有可观的强度和变形能力。此外，晶须增强的IPC设计大大提高了环氧陶瓷IPC的峰值强度和后弹性性能，提供了特殊的比能吸收(SEA)属性，高达18.5 J/g。在体积含量较低时，配筋相位设计的影响更为突出，导致强度和能量吸收特性存在较大差异。有限元分析表明，陶瓷增强相的最大主应力能力控制了破坏。卓越的静态特性与卓越的动态阻尼特性相结合。最大动态损失模量由增强相类型和体积含量控制，在55 Hz时，基于spinodal的30%陶瓷体积分数的IPCs超过500 MPa，该值优于大多数同等强度材料的阻尼能力。

A novel and precise method to determine the upper limit of crystallization temperature of basalt melts for the production of continuous basalt fibers

Yong Meng, Jianxun Liu, Shuqin Yang, Shaohua Dong, Zengsheng Li, Kaixiang Liu, Wen Liang

doi:10.1016/j.compscitech.2024.110633

 

为生产连续型玄武岩纤维，提出了一种确定玄武岩熔体结晶温度上限的新方法

The upper limit of crystallization temperature (Tc) of basalt melt is crucial for the production of continuous basalt fibers (CBFs). However, the precisely measuring Tc for basalt systems has been a challenging and time-consuming task. As a result, there is often a mismatch between the fiber-drawing temperature (Td) and the Tc of basalt melt during CBF production, which hinders the improvement of the mechanical properties and leads to the fiber fracture. To address these limitations, a new approach has been proposed to determine Tc by analyzing the inflection point of the viscosity-temperature curve, This is achieved by fitting an exponential function (y = y0 + Aexp(R0x)). The results of this viscosity fitting technique were compared to the microstructure and morphology of basalt melts quenched at different temperatures, which were assessed using X-ray diffraction (XRD) and scanning electron microscopy (SEM). The findings indicate that the results from XRD and micro-observations are in agreement with the viscosity fitting method. Furthermore, the variations of Tc and Td in binary basalt systems were quantified, and it was revealed that their behavior follows the linear superposition principle based on the mass percentage Wi (i=1, 2) of the two end members. Empirical formulas have been developed to describe this relationship, which are given as Tc = W1×Tc1 + W2×T c1 and Td = W1×Td1 + W2×Td2. These findings not only contribute to the precise measurement of Tc but also provide new insights for modeling the prediction formula of Tc for binary basalt systems.

玄武岩熔体结晶温度上限(Tc)对玄武岩连续纤维的形成至关重要。然而，玄武岩体系Tc的精确测量一直是一项具有挑战性和耗时的任务。因此，在CBF生产过程中，玄武岩熔体的拉丝温度(Td)与Tc不匹配，阻碍了纤维力学性能的提高，导致纤维断裂。为了解决这些限制，提出了一种新的方法，通过分析粘度-温度曲线的拐点来确定Tc，这是通过拟合指数函数(y = y0 + a exp(R0x))来实现的。利用x射线衍射仪(XRD)和扫描电镜(SEM)对不同温度下玄武岩熔体的微观结构和形貌进行了比较。结果表明，XRD和显微观察结果与粘度拟合方法吻合较好。此外，定量分析了二元玄武岩体系中Tc和Td的变化规律，发现它们的行为遵循基于两端成员质量百分比Wi (i= 1,2)的线性叠加原理。已经开发了经验公式来描述这种关系，分别为Tc = W1×Tc1 + W2×T c1和Td = W1×Td1 + W2×Td2。这些发现不仅有助于Tc的精确测量，而且为二元玄武岩体系Tc预测公式的建模提供了新的见解。

Investigation on grinding temperature characteristics of CF/PEEK and material removal mechanism under temperature treatments

Xin Yan, Huan Zhao, Zihang Wen, Yiwei Wang, Pulin Li, Han Ding

doi:10.1016/j.compscitech.2024.110621

 

温度处理下CF/PEEK的磨削温度特性及材料去除机理研究

Carbon fiber reinforced thermoplastic (CFRTP) composites grinding temperatures could even exceed the glass transition temperature (Tg) of the material due to heat accumulation, combined with the unknown material removal mechanism, resulting in machining defects. To investigate the grinding temperature distribution and maximum temperatures of carbon fiber-reinforced poly-ether-ether-ketone (CF/PEEK) composites, as a typical kind of CFRTP, an analytical temperature model considering the anisotropy was proposed based on the moving heat source theory, verified by the experimental results measured by the infrared camera. Further, the material removal mechanism under temperature treatments (below and above Tg) was also studied. In high temperatures (above Tg), there were many defects on surfaces after grinding, including resin smearing, severe deflection, fiber distortion, and grinding wheel clogging. Therefore, to reduce the grinding temperature below Tg, the vortex tube cooling-assisted grinding method was proposed in the research. The proposed method could reduce the grinding temperature in the grinding area, suppress resin smearing, improve the surface quality, enhance the elastic modulus and nano-hardness of the workpiece, and reduce the clogging of grinding wheels. This study provided a better understanding of the CF/PEEK grinding temperature characteristics and suggested a method to improve the grinding quality.

碳纤维增强热塑性塑料(CFRTP)复合材料由于热积累，磨削温度甚至可能超过材料的玻璃化转变温度(Tg)，再加上未知的材料去除机制，导致加工缺陷。为了研究碳纤维增强聚醚醚酮(CF/PEEK)复合材料的磨削温度分布和最高温度，基于移动热源理论，提出了考虑各向异性的分析温度模型，并通过红外摄像机实测结果进行了验证。此外，还研究了温度处理下(低于和高于Tg)材料的去除机理。在高温(Tg以上)下，磨削后的表面存在许多缺陷，包括树脂涂布、严重挠曲、纤维变形、砂轮堵塞等。因此，为了将磨削温度降低到Tg以下，本研究提出了涡流管冷却辅助磨削方法。该方法可以降低磨削区域的磨削温度，抑制树脂涂布，改善表面质量，提高工件的弹性模量和纳米硬度，减少砂轮堵塞。该研究有助于更好地了解CF/PEEK的磨削温度特性，并提出提高磨削质量的方法。

A breathable and sweat-absorbing pressure sensor based on PDMS gradient foam to achieve high sensitivity and wide detection range

Long Chen, Han Ye, Ping Yu

doi:10.1016/j.compscitech.2024.110628

 

一种基于PDMS梯度泡沫的透气吸汗压力传感器，实现高灵敏度和宽检测范围

Various designs of porous structures have been introduced to enhance the sensitivity of resistive pressure sensors. However, this method often comes at the cost of narrowing down the measurement range, limiting its use in low-pressure detection. This study proposes a soft pressure sensor with a two-layer gradient foam structure. By finely adjusting the porosity and cross-linking degree of the PDMS, we aim to enhance the sensitivity without compromising the range of the sensor. Testing results demonstrate that the sensitivity of the gradient foam increases with higher porosity, while the measurement range expands with a higher cross-linking degree. The soft sensor with the PDMS gradient stiffness foam (PGSF) achieves a sensitivity of 0.202 KPa-1 in the range of 0-40 kPa, 0.067 KPa-1 in the range of 40-210 kPa, and 0.020 KPa-1 in the range of 210-850 kPa. Furthermore, the sensor exhibits a minimum detection limit of 50 Pa and demonstrates excellent stability (withstanding over 8000 testing cycles), breathability, and sweat absorption ability. Additionally, we conducted motion detection, health monitoring, and pressure mapping tests to showcase the potential applications of our proposed soft sensor in these fields.

为了提高电阻式压力传感器的灵敏度，引入了多种多孔结构设计。然而，这种方法往往以缩小测量范围为代价，限制了其在低压检测中的应用。本研究提出一种双层梯度泡沫结构的软压力传感器。通过精细调节PDMS的孔隙度和交联度，我们的目标是在不影响传感器范围的情况下提高灵敏度。测试结果表明，梯度泡沫的灵敏度随孔隙率的增加而增加，而测量范围随交联度的增加而扩大。采用PDMS梯度刚度泡沫(PGSF)的软传感器在0 ~ 40 kPa范围内的灵敏度为0.202 kPa -1，在40 ~ 210 kPa范围内的灵敏度为0.067 kPa -1，在210 ~ 850 kPa范围内的灵敏度为0.020 kPa -1。此外，该传感器具有50 Pa的最小检测极限，并具有出色的稳定性(承受超过8000次测试周期)，透气性和吸汗能力。此外，我们还进行了运动检测、健康监测和压力映射测试，以展示我们提出的软传感器在这些领域的潜在应用。