【新文速递】2024年12月16日复合材料SCI期刊最新文章_ACT_Mechanical_Optical_System_Deform_振动_疲劳_断裂_复合材料_碰撞_非线性_裂纹_理论

【新文速递】2024年12月21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 3 篇，Composites Part B: Engineering 4 篇，Composites Science and Technology 1 篇Composite StructuresExperimental and numerical investigation on the mechanical behavior of 3D star-shaped auxetic structureWenjie Han, Yuliang Hou, Jianwei Shi, Liang Meng, Thaneshan Sapanathandoi:10.1016/j.compstruct.2024.118803三维星形结构力学性能的实验与数值研究This study proposes a novel 3D star-shaped auxetic (3D-SAU) structure and investigates the mechanical behavior using experimental and numerical approaches. Three lattice structures have been initially additively-manufactured using 3D-SAU cell, as well as the conventional body-centered-cubic (BCC) and 3D re-entrant (3D-RE) structures. Quasi-static compressive and low-velocity impact (LVI) tests have been performed on those additively-manufactured structures, to characterize the mechanical properties. The experimental and numerical results indicate that 3D-SAU structure possesses a more stable and prolonged stress plateau stage than BCC and 3D-RE structures, demonstrating its superior protective capacity. Moreover, LVI test results reveal that the structures with auxetic effect exhibit lower peak forces and longer impact durations compared to BCC structure. Both auxetic structures are found to possess better energy-absorption capacity during high energy impact cases. Finally, a parametric study of design parameters has been performed for 3D-SAU structure through quasi-static compressive tests, to optimize its performance in protecting internal components.本文提出了一种新型的三维星形形变（3D- sau）结构，并采用实验和数值方法研究了其力学行为。三种晶格结构最初使用3D- sau单元，以及传统的体心立方（BCC）和3D重入（3D- re）结构进行增材制造。对这些增材制造结构进行了准静态压缩和低速冲击（LVI）试验，以表征其力学性能。实验和数值结果表明，3D-SAU结构比BCC和3D-RE结构具有更稳定、更持久的应力平台阶段，显示出更强的保护能力。此外，LVI试验结果表明，与BCC结构相比，具有auxetic效应的结构具有更低的峰值力和更长的冲击持续时间。在高能量冲击情况下，两种结构都具有较好的吸能能力。最后，通过准静态压缩试验对3D-SAU结构的设计参数进行了参数化研究，以优化其保护内部构件的性能。CPMOH hydrogel with high tensile properties and environmental resistance Benefits from Intermolecular hydrogen bonding for ECG monitoringTinggang Zhang, Yang Li, Huan Liu, Jiafu Song, Junyao Wang, Jianlang Shu, Zhida Li, Yuyang Huang, Yuhan Huangdoi:10.1016/j.compstruct.2024.118820具有高拉伸性能和耐环境性能的CPMOH水凝胶应用于心电监测Conductive hydrogels (CHs) have been widely used in the design of flexible strain electrodes due to their excellent physicochemical properties, such as large stretchability and high electrical conductivity. However, conductive hydrogels when aqueous solvents are used as the dispersion medium are subject to freezing and drying, which greatly limits their applications. In this study, we demonstrated an conductive hydrogel that is resistant to ambient temperature and highly stretchable by replacing part of the water in the synthesized polyacrylamide/poly(vinylpyrrolidone)/carbon nanotube hydrogel with glycerol through a simple solvent substitution strategy, which provides excellent temperature resistance and good stability without sacrificing the stretchability and conductivity. The conductive hydrogel is environmentally tolerant and is capable of effectively detecting physiological signals from the human body at both high and low temperatures.导电水凝胶（CHs）由于其优异的物理化学性能，如大拉伸性和高导电性，在柔性应变电极的设计中得到了广泛的应用。然而，当使用水性溶剂作为分散介质时，导电水凝胶会受到冷冻和干燥的影响，这极大地限制了它们的应用。在本研究中，我们通过简单的溶剂替代策略，用甘油取代合成的聚丙烯酰胺/聚（乙烯吡咯烷酮）/碳纳米管水凝胶中的部分水，展示了一种耐环境温度和高拉伸性的导电水凝胶，在不牺牲拉伸性和导电性的情况下，具有优异的耐温性和良好的稳定性。导电水凝胶具有环境耐受性，能够在高温和低温下有效检测人体生理信号。Improvement of flame retardancy and anti-dripping properties of polypropylene composites via ecofriendly borax cross-linked lignocellulosic fiberSandeep Gairola, Shishir Sinha, Inderdeep Singhdoi:10.1016/j.compstruct.2024.118822 用硼砂交联木质纤维素纤维改善聚丙烯复合材料的阻燃和防滴性能This research endeavour investigates the enhancement of flame retardancy in natural fiber-reinforced polypropylene composites through boron-based cross-linking. Jute-sisal fabric was treated with borax and subsequently incorporated into a polypropylene matrix to develop flame-retardant composites. The borax-treated fabric exhibited significantly improved flame resistance, as evidenced by a 25.28% increase in limiting oxygen index (LOI), a 60.16% reduction in peak heat release rate (pHRR), and a 3.59% decrease in average heat release rate (av-HRR) compared to the untreated fabric. Similarly, the developed composites demonstrated enhanced thermal stability and flame retardancy, with a 22.01% increase in LOI, a 22.29% reduction in pHRR, and a 22.23% decrease in av-HRR compared to composites reinforced with untreated fibers. The dimensional thermal stability (DTS) of the composites, assessed by heat deflection temperature and coefficient of thermal expansion, was also improved with the incorporation of borax-modified fibers. Chemical and morphological analysis of the char residues of the treated fibers revealed a compact fibrous structure, which likely contributes to the enhanced flame retardancy by forming a protective char layer that insulates the underlying material and hinders heat and mass transfer.本研究旨在探讨通过硼基交联增强天然纤维增强聚丙烯复合材料的阻燃性。黄麻-剑麻织物用硼砂处理，随后加入聚丙烯基体，以开发阻燃复合材料。与未处理织物相比，硼砂处理织物的极限氧指数（LOI）提高了25.28%，峰值放热率（pHRR）降低了60.16%，平均放热率（av-HRR）降低了3.59%，阻燃性能得到了显著提高。同样，与未经处理的纤维增强的复合材料相比，开发的复合材料表现出更好的热稳定性和阻燃性，LOI增加22.01%，pHRR降低22.29%，av-HRR降低22.23%。以热挠曲温度和热膨胀系数评价复合材料的尺寸热稳定性（DTS），硼砂改性纤维的掺入也提高了复合材料的尺寸热稳定性。经过处理的纤维的炭渣的化学和形态分析显示了致密的纤维结构，这可能有助于通过形成一个保护炭层来隔离底层材料并阻碍传热和传质，从而增强阻燃性。Topology optimization method for light-weight design of three-dimensional continuous fiber-reinforced polymers (CFRPs) structuresYongjia Dong, Hongling Ye, Yang Xiao, Jicheng Li, Weiwei Wangdoi:10.1016/j.compstruct.2024.118819三维连续纤维增强聚合物（cfrp）结构轻量化设计的拓扑优化方法Continuous fiber-reinforced polymers (CFRPs) exhibit excellent mechanical properties and designability, offering more opportunities for achieving better structural performance through optimization. However, the high non-convexity of the concurrent optimization model may result in a suboptimal design. In this paper, a novel topology optimization method for three-dimensional CFRP structures is proposed. The light-weight optimization model with compliance constraint is formulated and solved to obtain an optimal topology and spatial fiber orientation. A local coordinate system is established based on the vectors of principal stress and fiber orientation, the interpolation method is presented to control fiber design variables during iteration, reducing the possibility of local optima. Topology and fiber orientation design variables are updated through the method of moving asymptotes (MMA) after sensitivity analysis. Numerical examples are offered to demonstrate the applicability of proposed method. The influence of different initial fiber orientations, mesh sizes and compliance constraints on the optimization results are discussed. Furthermore, the interpolation strategy is also extended to multi-loaded problems, with effectiveness evaluated through a numerical example. The proposed method offers theoretic support for light-weight design and fiber paths planning of three-dimensional CFRP structures.连续纤维增强聚合物（CFRPs）具有优异的力学性能和可设计性，为通过优化获得更好的结构性能提供了更多的机会。然而，并行优化模型的高度非凸性可能导致次优设计。本文提出了一种新的CFRP三维结构拓扑优化方法。建立并求解了具有柔度约束的轻量化优化模型，以获得最优的拓扑结构和空间光纤方向。基于主应力矢量和纤维取向矢量建立了局部坐标系，提出了在迭代过程中控制纤维设计变量的插值方法，减少了局部最优的可能性。在灵敏度分析后，通过移动渐近线法更新拓扑和光纤方向设计变量。数值算例验证了该方法的适用性。讨论了不同初始纤维取向、网格尺寸和柔度约束对优化结果的影响。此外，还将该插值策略推广到多载荷问题，并通过数值算例对其有效性进行了评价。该方法为三维CFRP结构的轻量化设计和纤维路径规划提供了理论支持。Composites Part A: Applied Science and ManufacturingNumerical analysis of fatigue evolution of laminated composites using cohesive zone model and extended finite element methodRong-Can Hong, Ryo Higuchi, Xin Lu, Tomohiro Yokozekidoi:10.1016/j.compositesa.2024.108653 基于黏聚区模型和扩展有限元法的层合复合材料疲劳演化数值分析A numerical method for fatigue accumulation of in laminated composites is developed in this paper. Extended finite element method (XFEM) and cohesive element are integrated into a numerical program for modelling intralaminar matrix cracking and delamination in composite laminates, respectively. A damage-mechanics-based fatigue model is also introduced into the numerical scheme. Pure modes fatigue tests are used for the identification of fatigue parameters. The simulation of open hole tensile test is then performed to investigate the fatigue behaviors of composite laminates. The numerical damage distribution aligns with prior test records, while the predicted fatigue life is consistent with the referenced data. The fast crack propagation observed in the reference is also captured. This study demonstrates that the proposed numerical method can predict the fatigue initiation and evolution of multi-cracks under mixed mode loading. This paper introduces a convenient approach to effectively simulate multiple fatigue cracks in composite laminates.本文提出了一种层合复合材料疲劳累积的数值计算方法。将扩展有限元法（XFEM）和内聚元法（cohesive element）分别集成到复合材料层合板层内基体开裂和分层的数值模拟程序中。数值方案中还引入了基于损伤力学的疲劳模型。采用纯模态疲劳试验对疲劳参数进行识别。通过模拟开孔拉伸试验研究复合材料层合板的疲劳行为。数值损伤分布与试验记录一致，疲劳寿命预测与参考数据一致。在参考文献中观察到的快速裂纹扩展也被捕获。研究表明，所提出的数值方法可以预测混合模式载荷下多裂纹的疲劳萌生和演化过程。本文介绍了一种有效模拟复合材料层合板多重疲劳裂纹的简便方法。A comparative study of 3D woven variable-thickness composite structures with reduced yarns and varied weft sizes under cantilever loadingZengfei Liu, Jingran Ge, Yang Sun, Binbin Zhang, Xiaodong Liu, Jun Liangdoi:10.1016/j.compositesa.2024.108675悬臂载荷下减少纱线和不同纬纱尺寸的三维变厚编织复合材料结构的对比研究In this paper, two types of 3D woven variable-thickness composite structures are designed by reducing yarns and varying weft sizes with the same weave patterns. The mesoscale geometric morphology of two kinds of variable-thickness composite structures is observed by the optical microscope. The cantilever loading tests of the variable-thickness composite structures combined with DIC and strain gauges were carried out, and the strain distribution was determined using finite element analysis. The differences in the mechanical properties and failure mechanisms of woven variable-thickness composite structures with different preform manufacturing processes are comparatively investigated through the surface strain field evolution process and fracture morphology analysis of the specimens. The results show that the varied weft yarn size variable-thickness structures maintain the yarn continuity compared to the reduced yarn structures, but the stiffness and strength are weaker. This study provides mechanical property data support for process design optimization of aero-engine fan blades.在相同的织型条件下，通过减少纱线和改变纬纱尺寸，设计了两种三维变厚织物结构。用光学显微镜观察了两种变厚度复合材料结构的中尺度几何形态。采用DIC和应变片对变厚复合材料结构进行了悬臂加载试验，通过有限元分析确定了应变分布。通过试样的表面应变场演化过程和断口形貌分析，比较研究了不同预制体制造工艺编织变厚度复合材料结构的力学性能差异和破坏机制。结果表明：变纬纱粗变结构与减纬纱结构相比，保持了纱线的连续性，但刚度和强度较弱；该研究为航空发动机风扇叶片的工艺设计优化提供了力学性能数据支持。Characterization of damage in non-crimp fabric glass fiber-reinforced reactive thermoplastic composites at low temperature using an in-situ digital imaging techniqueErli Shi, John Montesanodoi:10.1016/j.compositesa.2024.108674使用原位数字成像技术表征无卷曲织物玻璃纤维增强反应性热塑性复合材料在低温下的损伤An in-situ digital imaging technique was developed to characterize damage in non-crimp fabric glass fiber/reactive thermoplastic cross-ply laminates subjected to tensile loading at −50 °C. A custom algorithm was developed to automatically detect the initiation and growth of 90° tow cracks, matrix cracks, and 0° tow cracks through image stacking, shift-correction, and thresholding. The laminates exhibited four stages of deformation/damage, including linear elastic, onset/growth of 90° fiber tow cracks, onset/growth of 0° fiber tow cracks, and progressive failure of 0° fiber tows. Although at low temperature the effective laminate strength and stiffness increased by 4 % and 13 %, respectively, damage initiated sooner and propagated at a higher rate leading to a 60 % increase in crack density at saturation. The digital imaging technique proved to effectively detect local damage in the glass fiber/thermoplastic laminates, which led to a deeper understanding of their low-temperature deformation response, damage characteristics, and damage tolerance.开发了一种原位数字成像技术，用于表征非卷曲织物玻璃纤维/反应性热塑性交叉层合板在- 50 °C拉伸载荷下的损伤。开发了一种自定义算法，通过图像叠加、位移校正和阈值化自动检测90°tow裂纹、矩阵裂纹和0°tow裂纹的起裂和扩展。层合板呈现线性弹性、90°纤维束裂纹开始/扩展、0°纤维束裂纹开始/扩展和0°纤维束逐渐破坏四个阶段的变形/损伤。虽然在低温下层合板的有效强度和刚度分别增加了4 %和13 %，但损伤开始更快，扩展速度更快，导致饱和时裂纹密度增加了60 %。事实证明，数字成像技术可以有效地检测玻璃纤维/热塑性层压板的局部损伤，从而更深入地了解其低温变形响应、损伤特性和损伤容限。Composites Part B: EngineeringExperimental study on circumferential compression behavior of large-diameter bamboo winding composite pipe (BWCP)Jin Xia, Yu Zhou, Yue Chen, Qingang Ma, Jialin Dongdoi:10.1016/j.compositesb.2024.112082大直径竹缠绕复合管周向压缩性能试验研究Bamboo winding composite pipe (BWCP) is a new type of environmentally friendly pipe material that uses bamboo as the base material. In this study, the circumferential compressive performance of large-diameter BWCP (inner diameter ≥ 1 m) was investigated under various inner diameter and wall thickness conditions through parallel plate loading tests. The results showed that the initial ring stiffness of BWCP increased with wall thickness, rising from approximately 5 kN/m2 at 42 mm thickness to 25 kN/m2 at 67 mm when the inner diameter was 1.4 m. Conversely, the ring stiffness declined as inner diameter increased. When the wall thickness was approximately 52 mm, the initial ring stiffness dropped from about 18 kN/m2 at an inner diameter of 1.0 m to around 3.3 kN/m2 at 1.6 m. This decline became more pronounced with larger diameters, with a 50% reduction from 1.2 m to 1.4 m and a 60% reduction from 1.4 m to 1.6 m. BWCP demonstrated strong toughness and resistance to deformation under external pressure, with load-displacement curves showing a distinct yield plateau and specimens exhibiting ductile failure characteristics. After unloading, the pipes retained over 95% of their original inner diameter. Due to the layered anisotropic nature of BWCP, a single elastic modulus does not accurately represent its ring stiffness. Thus, an equivalent elastic modulus calculation method based on the law of mixture was adopted, and a semi-empirical, semi-theoretical formula for predicting the initial ring stiffness of BWCP was proposed by combining mechanical theory with experimental results.竹缠绕复合管是一种以竹材为基材的新型环保管材。本研究通过平行板加载试验，研究了不同内径和壁厚条件下大直径BWCP（内径≥1 m）的周向压缩性能。结果表明：当内径为1.4 m时，BWCP的初始环刚度随壁厚的增加而增加，从42 mm时的约5 kN/m2增加到67 mm时的25 kN/m2；相反，环刚度随内径的增大而减小。当壁厚约为52 mm时，初始环刚度从内径1.0 m时的约18 kN/m2下降到1.6 m时的约3.3 kN/m2。随着直径的增大，这种下降更加明显，从1.2 m到1.4 m减少了50%，从1.4 m到1.6 m减少了60%。BWCP具有较强的韧性和抗外压变形能力，载荷-位移曲线呈现明显的屈服平台，试件表现出延性破坏特征。卸载后，管道保留了95%以上的原始内径。由于BWCP的层状各向异性，单一弹性模量不能准确表示其环刚度。因此，采用基于混合规律的等效弹性模量计算方法，结合力学理论和实验结果，提出了预测BWCP初始环刚度的半经验、半理论公式。3D printing and near-net shaping of laminated Cr3C2/Cu composites: Enhanced strength, toughness, and anisotropyShuai-Shuai Li, Xiang-Yu Meng, Rui-Fen Guo, Ping Shendoi:10.1016/j.compositesb.2024.112090 Cr3C2/Cu复合材料的3D打印和近净成形：增强强度、韧性和各向异性Ceramic/metal laminates offer great potential for enhancing mechanical properties; however, traditional fabrication methods lack precise microstructural control. This study employed direct ink writing (DIW) and pressureless infiltration to create near-net-shape Cr3C2/Cu laminates with tailored properties. Adjusting the Cr3C2 content and loading orientation yielded significant improvements in strength and toughness. Notably, a composite with 26.2 vol.% Cr3C2 exhibited a flexural strength of 995 MPa and a fracture toughness (KIC) of 22.3 MPa·m1/2 when loaded parallel to the layers (S-YOZ), exceeding values reported for conventionally manufactured counterparts. The enhanced mechanical properties and anisotropic behavior result from the synergy between the alternating soft Cu and hard Cr3C2 layers, the interpenetrating microstructures, and strong interfacial bonding. In situ observations and finite element simulations confirmed toughening mechanisms, including crack deflection, ductile bridging, and multiple cracking. This DIW-based approach offers a promising route for designing high-performance ceramic/metal composites.陶瓷/金属层状复合材料在提高机械性能方面具有巨大的潜力，但传统的制备方法缺乏精确的微观结构控制。本研究采用直接墨水书写（DIW）和无压浸渍的方法，以获得具有定制性能的近净形Cr3C2/Cu层状复合材料。通过调整Cr3C2含量和加载方向，显著提高了强度和韧性。值得注意的是，当Cr3C2含量为26.2体积％时，该复合材料在平行于层的方向（S-YOZ）上的弯曲强度为995 MPa，断裂韧性（KIC）为22.3 MPa·m1/2，超过了传统制造方法的同类材料的报告值。增强的机械性能和各向异性行为源于交替的软铜和硬Cr3C2层、相互渗透的微观结构和强界面结合。在位观察和有限元模拟证实了增韧机制，包括裂纹偏转、塑性桥接和多裂纹。基于DIW的方法为设计高性能陶瓷/金属复合材料提供了有前途的途径。Adhered Web-Lapped Semi-Rigid Pultruded FRP Beam-to-Column Framing Connections: Part 2 – Spring Constant, Strength Prediction, and ApplicationsDavid Pirchio, Juan Diego Pozo, Kevin Q. Walshdoi:10.1016/j.compositesb.2024.112097粘结网搭接半刚性拉挤FRP梁-柱框架连接：第2部分-弹簧常数，强度预测和应用The herein research focused on the definition of the spring constant, developing a predictive equation for strength, and a parametric study for adhered lapped semi-rigid pultruded fiber reinforced polymers (FRP) beam-to-column connections. The research is the second part of a two-part paper in which the first part focused on the experimental testing of 51 lapped adhered semi-rigid pultruded FRP beam-to-column connections in cyclic loading. The spring constant was determined based on analytical methods to determine the initial stiffness of the semi-rigid connections, net deformation due to flexural bending, and shear acting on the connection component (i.e., the column and the beam). A predictive equation to determine the strength of the semi-rigid connection was developed using an analytical approach and compared with the connection strength determined in the first part of the work, and a strength reduction factor (i.e., ϕ-factor) was defined to grant a standard-compliant level of reliability for the application of the developed predictive equation into load and resistance factor design (LRFD) approach. Finally, the possible applications of the results within the boundaries of LRFD design of pultruded FRP framing systems were discussed via a parametric study in which the results were applied and two real-world examples.本文的研究重点是弹簧常数的定义，建立了强度预测方程，并对粘接搭接半刚性拉伸纤维增强聚合物（FRP）梁柱连接进行了参数化研究。本文的研究是两部分论文的第二部分，第一部分是对51个循环荷载下搭接粘贴半刚性拉挤FRP梁柱连接的试验测试。弹簧常数根据解析方法确定半刚性连接的初始刚度、受弯净变形和作用于连接构件（即柱和梁）的剪力。使用分析方法开发了用于确定半刚性连接强度的预测方程，并将其与第一部分工作中确定的连接强度进行了比较，并定义了强度折减因子（即，因子），以便为将开发的预测方程应用于负载和阻力因素设计（LRFD）方法提供符合标准的可靠性水平。最后，通过参数化研究和两个现实世界的例子，讨论了结果在拉挤FRP框架系统LRFD设计边界内的可能应用。Three-dimensional printing of high-performance continuous fiber-reinforced thermoplastic composites: causes and elimination of process-induced defectsWeijun Zhu, Long Fu, Xiaoyong Tian, Quan Zhi, Zhanghao Hou, Zhikun Zhang, Ning Wang, Tengfei Liu, Henglun Sun, Ryosuke Matsuzaki, Masahito Ueda, Andrei V. Malakhov, Alexander N. Polilov, Meng Luo, Dongsheng Li, Dichen Lidoi:10.1016/j.compositesb.2024.112080高性能连续纤维增强热塑性复合材料的三维打印：工艺缺陷的原因和消除Continuous fiber composite three-dimensional (3D) printing technology enables the production of lightweight, complex 3D composite parts with functional integration and other significant advantages. However, in high-end applications, scenarios such as aerospace and energy delivery the performance stability of materials in long-term service environments is critical. The poor performance and instability of the existing 3D printing of fiber composite materials, particularly fiber-reinforced thermoplastic materials, caused by the various defects introduced in the printing process, has become the main challenge. This paper focuses on high-performance continuous fiber-reinforced thermoplastic composites. It reviews various defects in the printing process and discusses their mechanisms, effects on properties and possible elimination measures. Printing defects are categorized into two types based on their primary components: polymer defects and fiber-related defects. This paper also discusses two types of defects: defects in turning zones and defects on surfaces, which are classified based on their location. In addition, this paper summarizes the existing defect elimination methods and research progress. It also suggests the direction of future development, emphasizing that understanding the mechanisms and addressing irremovable defects are crucial for advancing high-performance 3D printing technology.连续纤维复合材料三维（3D）打印技术使生产轻量化、复杂的3D复合材料部件具有功能集成等显著优势。然而，在高端应用中，如航空航天和能源输送等场景，材料在长期服务环境中的性能稳定性至关重要。现有的纤维复合材料，特别是纤维增强热塑性材料的3D打印由于在打印过程中引入的各种缺陷而导致的性能差和不稳定性成为主要挑战。本文主要研究高性能连续纤维增强热塑性复合材料。综述了印刷过程中出现的各种缺陷，讨论了缺陷产生的机理、对性能的影响以及可能的消除措施。打印缺陷根据其主要成分可分为两类：聚合物缺陷和纤维相关缺陷。本文还讨论了两类缺陷：车削区缺陷和表面缺陷，并根据它们的位置进行了分类。此外，本文还总结了现有的缺陷消除方法和研究进展。指出了未来的发展方向，强调了解机理和解决不可消除的缺陷对于推进高性能3D打印技术至关重要。Composites Science and TechnologyCharacterization of fracture behavior in adhesively bonded joints with porosity in the adhesive layer using X-ray computed tomographyWilliam E. Guin, John V. Bausano, Ashley N. Taets, Alan T. Nettles, Scott Ragasadoi:10.1016/j.compscitech.2024.111025 用x射线计算机断层扫描表征带有黏合剂层孔隙的黏合剂粘合接头的断裂行为Adhesively bonded joints with various levels of porosity in the adhesive layer are examined via X-ray computed tomography (CT) and Mode I fracture toughness testing. Bonded assemblies consisting of woven carbon fiber/epoxy composite adherends and a toughened epoxy film adhesive are considered. Porosity is induced in the adhesive layer through the use of shims during the manufacturing process. X-ray CT and accompanying image processing is used to characterize bondline thicknesses and void content in each Mode I fracture toughness specimen considered. Mode I fracture toughness tests are carried out to quantitatively assess the effects of porosity in the adhesive layer and post-test optical microscopy is used to examine the relationships between fracture toughness and fracture processes. This experimental approach is used to establish relationships among bondline thickness, void content, Mode I fracture toughness, and failure modes in an effort to correlate quantifiable physical parameters to adhesively bonded joint structural performance.通过x射线计算机断层扫描（CT）和I型断裂韧性测试，对粘接层中具有不同孔隙度的粘接接头进行了检查。考虑了由编织碳纤维/环氧复合材料粘合剂和增韧环氧薄膜粘合剂组成的粘合组件。在制造过程中，通过使用垫片在胶粘剂层中引起孔隙。x射线CT和伴随的图像处理用于表征所考虑的每个I型断裂韧性试样的结合线厚度和空洞含量。进行I型断裂韧性试验，定量评价粘接层孔隙率的影响，试验后使用光学显微镜检查断裂韧性与断裂过程的关系。该实验方法用于建立粘结线厚度、空隙含量、I型断裂韧性和破坏模式之间的关系，试图将可量化的物理参数与粘接接头的结构性能联系起来。来源：复合材料力学仿真Composites FEM