Composites Part C Open Access最新文献

Experimental investigation and modelling of the nonlinear creep behaviour of additive-manufactured carbon fibre-reinforced polyethylene terephthalate (CF-PET). 对添加剂制造的碳纤维增强聚对苯二甲酸乙二酯（CF-PET）的非线性蠕变行为进行实验研究和建模。

IF 5.3 Q2 MATERIALS SCIENCE, COMPOSITES

Composites Part C Open Access

Pub Date : 2024-10-01 DOI: 10.1016/j.jcomc.2024.100530

Silas Z. Gebrehiwot , Leonardo Espinosa-Leal , Paula Linderbäck , Heikki Remes

In this paper, the nonlinear creep behaviour of additive-manufactured carbon fibre-reinforced polyethylene terephthalate (CF-PET) is characterised using experimental, theoretical and computational methods. The experimental approach investigates the influence of infill orientations on the creep deformation of the material. For the study, samples at 0°, 45^○, and 90° infill orientations are produced with 90% infill density using fused filament fabrication (FFF). The infill orientation parameter highly influences the creep behaviour. Increasing the infill orientation from 0° to 90° monotonically improves the creep resistance of the material, which can be explained by orientation of the fibre-matrix reinforcement towards the uniaxial stresses. Surface examinations of creep-ruptured samples via scanning electron microscopy (SEM) reveal that a combination of matrix failure, fibre pull-out, fibre-matrix debonding, inter-layer debonding, and the presence of voids cause the fractures. Based on the experimental data, the primary and secondary creep responses are modelled theoretically and computationally. The theoretical model is based on the dependence of the material's creep on stress and time parameters at the transient and steady state stages. Combined stress and time functions are used to model the creep of the material. Parallelly, two-dimensional (2D) finite element (FE) analyses are made on COMSOL Multiphysics to model the creep computationally. The approach is based on the superposition of Norton's and Garofalo's creep models with predefined time hardening property. The results of the modelling are in good agreement with the experimental findings, showing a maximum of 1.04 % for the theoretical, and 2.9 % for the computational approaches.

本文采用实验、理论和计算方法对添加剂制造的碳纤维增强聚对苯二甲酸乙二酯（CF-PET）的非线性蠕变行为进行了表征。实验方法研究了填充方向对材料蠕变变形的影响。在研究中，采用熔融长丝制造（FFF）技术，以 90% 的填充密度生产出 0°、45° 和 90°填充方向的样品。填充方向参数对蠕变行为有很大影响。将填充取向从 0°增加到 90°，材料的抗蠕变性就会单调地提高，这可以用纤维-基质加固材料对单轴应力的取向来解释。通过扫描电子显微镜（SEM）对蠕变破裂样品进行的表面检查显示，基体破坏、纤维拉出、纤维基体脱胶、层间脱胶和空隙的存在共同导致了断裂。根据实验数据，对一次和二次蠕变反应进行了理论和计算建模。理论模型基于材料蠕变在瞬态和稳态阶段对应力和时间参数的依赖性。结合应力和时间函数来模拟材料的蠕变。同时，在 COMSOL Multiphysics 上进行二维（2D）有限元（FE）分析，以建立蠕变计算模型。该方法基于 Norton 和 Garofalo 蠕变模型与预定义时间硬化特性的叠加。建模结果与实验结果非常吻合，理论方法的最大值为 1.04%，计算方法的最大值为 2.9%。

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引用次数: 0

Lightweight 3D-printed heaters: design and applicative versatility 轻质 3D 打印加热器：设计和应用多样性

IF 5.3 Q2 MATERIALS SCIENCE, COMPOSITES

Composites Part C Open Access

Pub Date : 2024-10-01 DOI: 10.1016/j.jcomc.2024.100527

Francesca Aliberti , Andrea Sorrentino , Barbara Palmieri , Luigi Vertuccio , Giuseppe De Tommaso , Roberto Pantani , Liberata Guadagno , Alfonso Martone

This paper proposes a new strategy for designing a 3D-printed heater that can overcome some criticalities of current commercial heater devices for application in the transport and energy sectors. A semiconductive nanocomposite material, acrylonitrile-butadiene-styrene filled with carbon nanotubes (ABS-CNT), was processed via Fused Filaments Fabrication (FFF). The printing was set to favor the current flow along the printing direction, consequently increasing the material's electrical conductivity. 3D-printed heater geometry, equivalent to several electrical resistances (resistive branches) connected in parallel, was optimized by varying the width, thickness, lengths, and number of branches. The adopted approach resulted in a flexible and scalable low-equivalent resistance value heater. Moreover, the optimized heater's flexibility allows it to be integrated into a curved fiberglass composite. Joule heating tests were experimentally performed and theoretically simulated by a multi-physics model. The numerical prediction resulted in good agreement with the experimental data. The results encourage the application of 3D-printed heaters as functional patches for the thermal management of different devices/components, including complex-shape composite structures.

本文提出了一种设计三维打印加热器的新策略，这种加热器可以克服当前商业加热器设备的一些关键问题，应用于交通和能源领域。通过熔融长丝制造技术（FFF）加工了一种半导体纳米复合材料--填充碳纳米管的丙烯腈-丁二烯-苯乙烯（ABS-CNT）。打印设置有利于电流沿打印方向流动，从而提高材料的导电性。通过改变宽度、厚度、长度和分支数量，对 3D 打印加热器的几何形状进行了优化，该加热器相当于几个并联的电阻（电阻分支）。所采用的方法产生了一种灵活、可扩展的低等效电阻值加热器。此外，经过优化的加热器还具有灵活性，可以将其集成到曲面玻璃纤维复合材料中。焦耳加热试验是通过多物理场模型进行实验和理论模拟的。数值预测结果与实验数据十分吻合。研究结果鼓励将三维打印加热器作为功能性贴片应用于不同设备/组件（包括复杂形状的复合结构）的热管理。

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引用次数: 0

Comparative analysis of delamination resistance in CFRP laminates interleaved by thermoplastic nanoparticle: Evaluating toughening mechanisms in modes I and II 热塑性纳米粒子交错复合材料层压板抗分层能力的比较分析：评估模式 I 和模式 II 的增韧机制

IF 5.3 Q2 MATERIALS SCIENCE, COMPOSITES

Composites Part C Open Access

Pub Date : 2024-10-01 DOI: 10.1016/j.jcomc.2024.100518

Reza Mohammadi , R Akrami , Maher Assaad , Ahmed Imran , Mohammad Fotouhi

The study considers the delamination resistance of carbon/epoxy laminates modified with Thermoplastic Nanoparticles of Polysulfone (TNPs). A new electrospinning nanofiber technique was utilized to convert polysulfone polymer into nanoparticles and uniformly disperse them within the resin. Fracture toughness was evaluated under loading modes I and II. In mode I, the toughness (G_IC) increased significantly from 170 to 328 J/m² with TNPs incorporation. However, mode II showed minimal change, with G_IIC values of 955 J/m² for virgin and 950 J/m² for TNPs-modified specimens. Scanning Electron Microscopy (SEM) was employed to depict the influence of TNPs on damage characteristics and crack propagation patterns. In mode I, crack deviation enhanced toughness as TNPs bypassed the PSU, while in mode II, cracks propagated through TNPs, resulting in particle smearing on the epoxy surface. This highlights TNPs' potential to modify the fracture toughness in mode I loading, but their effect is constrained in mode II loading scenarios.

本研究探讨了使用热塑性纳米聚砜粒子（TNPs）改性的碳/环氧层压板的抗分层性能。研究采用了一种新的电纺丝纳米纤维技术，将聚砜聚合物转化为纳米颗粒并均匀地分散在树脂中。在加载模式 I 和 II 下对断裂韧性进行了评估。在模式 I 中，加入 TNPs 后，韧性（GIC）从 170 J/m² 显著增加到 328 J/m²。然而，模式 II 的变化很小，原始试样的 GIIC 值为 955 J/m²，TNPs 改性试样的 GIIC 值为 950 J/m²。扫描电子显微镜（SEM）被用来描述 TNPs 对损伤特征和裂纹扩展模式的影响。在模式 I 中，由于 TNPs 绕过了 PSU，因此裂纹偏离增强了韧性；而在模式 II 中，裂纹通过 TNPs 传播，导致颗粒在环氧树脂表面涂抹。这凸显了 TNPs 在模式 I 加载中改变断裂韧性的潜力，但在模式 II 加载情况下，其作用受到限制。

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引用次数: 0

Characteristics and evaluation of recycled waste PVCs as a filler in composite structures: Validation through simulation and experimental methods 作为复合材料结构填充物的回收废聚氯乙烯的特性和评估：通过模拟和实验方法进行验证

IF 5.3 Q2 MATERIALS SCIENCE, COMPOSITES

Composites Part C Open Access

Pub Date : 2024-10-01 DOI: 10.1016/j.jcomc.2024.100525

Eko Supriyanto , Nugroho Karya Yudha , Alvin Dio Nugroho , Muhammad Akhsin Muflikhun

Solar Cell as a renewable energy utilization in today's era is considered a suitable choice due to encompass sustainability, environmental preservation, and energy processing efficiency. Solar cells have a finite lifespan that need replacement to maintain energy absorption efficiency. Unfortunately, discarded materials are often underutilized or improperly disposed of. In this study, used photovoltaic solar cell materials are explored as reinforcements in composites. The results showed that 4 % cell filler specimen exhibited highest ultimate tensile strength (UTS) with 51.43 MPa. Followed by Compression strength with 35.38 MPa and flexural strength with 45.54 MPa. SEM/EDS analysis of PV filler specimens revealed the dominance of Carbon (C) and Silica (Si) materials, comprising over 60 %. FT-IR analysis indicated varying compound bond intensities affecting polymerization and material strength under applied forces. Simulation results showed a difference of <2 % when compared to experimental testing outcomes. The current study benefited in environmental conservation efforts through waste reduction and the reuse of recycled materials and are listed in several applications such as in wind turbine, structures, lightweight laminates, automotive structures, and sport equipment.

在当今时代，太阳能电池作为一种可再生能源，因其可持续性、环境保护和能源处理效率而被认为是一种合适的选择。太阳能电池的寿命有限，需要更换以保持能量吸收效率。遗憾的是，废弃材料往往没有得到充分利用或处理不当。在这项研究中，探讨了将废旧光伏太阳能电池材料作为复合材料的增强材料。结果表明，4% 电池填料试样的极限拉伸强度（UTS）最高，为 51.43 兆帕。其次是压缩强度（35.38 兆帕）和弯曲强度（45.54 兆帕）。光伏填料试样的 SEM/EDS 分析表明，碳（C）和硅（Si）材料占主导地位，超过 60%。傅立叶变换红外分析表明，不同的化合物键强度会影响聚合和材料在外力作用下的强度。模拟结果显示，与实验测试结果相比，差异为 2%。目前的研究通过减少废物和再利用回收材料，有利于环境保护工作，并被广泛应用于风力涡轮机、结构、轻质层压板、汽车结构和运动器材等领域。

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引用次数: 0

The acoustic properties of FDM printed wood/PLA-based composites FDM 印刷木材/聚乳酸基复合材料的声学特性

IF 5.3 Q2 MATERIALS SCIENCE, COMPOSITES

Composites Part C Open Access

Pub Date : 2024-10-01 DOI: 10.1016/j.jcomc.2024.100532

K. Vigneshwaran , N. Venkateshwaran , R. Shanthi , Gokul Kannan , B.Rajesh Kumar , Vigneshwaran Shanmugam , Oisik Das

The acoustic properties of the Fused Deposition Modelling (FDM) printed PLA wood composite was investigated. Initially tensile and flexural of wood PLA composite was studied with respect to varying layer thickness (0.15 mm, 0.20 mm, and 0.30 mm), infill density (30 %, 60 %, and 90 %), and pattern (Layer, Triangle, and Hexagon). The outcomes demonstrated that the specimen produced with a hexagonal pattern, 90% infill density, and 0.2 mm layer thickness had the highest tensile (16 MPa) and flexural strength (16 MPa). Utilizing this optimized parameter, micro-perforated panels were printed and acoustic properties were studied. Five specimens with a 3 mm thickness, various perforation diameters (5 mm, 4 mm, and 3 mm), and architecturally tapered perforations were fabricated. Using the impedance tube approach, the sound transmission loss and sound absorption coefficients were measured. The findings indicate that, in comparison to all the printed specimens, tapered type perforation with an exterior diameter of 5 mm and an internal diameter of 4.7 mm showed highest sound absorption coefficient of 0.60 Hz. A viscous loss is obtained by its convergent hole diameter reduction, which results in sound attenuations and is easily absorbed in the micro-perforated panel. Similar to this, the specimen printed with smaller perforation diameters (3 mm) had a high sound transmission loss of 79 dB. The small diameter of the perforations prevented the passage of sound waves. The current study is anticipated to lay the groundwork for extensive future research on these classes of materials, potentially serving as a catalyst for advancements in FDM based polymeric materials research and development.

研究了熔融沉积成型（FDM）印刷聚乳酸木材复合材料的声学特性。首先研究了不同层厚（0.15 毫米、0.20 毫米和 0.30 毫米）、填充密度（30%、60% 和 90%）和图案（层状、三角形和六边形）的聚乳酸木材复合材料的拉伸和弯曲性能。结果表明，采用六边形图案、90% 填充密度和 0.2 毫米层厚制作的试样具有最高的抗拉强度（16 兆帕）和抗弯强度（16 兆帕）。利用这一优化参数，印制了微穿孔板，并对其声学特性进行了研究。制作了五块厚度为 3 毫米、穿孔直径（5 毫米、4 毫米和 3 毫米）不同、穿孔呈建筑锥形的试样。使用阻抗管方法测量了声音传输损失和吸声系数。结果表明，与所有印刷试样相比，外部直径为 5 毫米、内部直径为 4.7 毫米的锥形穿孔的吸声系数最高，为 0.60 赫兹。由于其收敛孔直径减小，产生了粘性损失，从而导致声音衰减，并很容易被微穿孔板吸收。与此类似，用较小的穿孔直径（3 毫米）印制的试样的声音传输损失也高达 79 分贝。小直径穿孔阻碍了声波的通过。目前的研究预计将为今后对这些材料类别的广泛研究奠定基础，并有可能成为促进基于 FDM 的聚合物材料研究和开发的催化剂。

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引用次数: 0

Durability and compressive strength of composite polyolefin fiber-reinforced recycled aggregate concrete: An experimental study 复合聚烯烃纤维增强再生骨料混凝土的耐久性和抗压强度：实验研究

IF 5.3 Q2 MATERIALS SCIENCE, COMPOSITES

Composites Part C Open Access

Pub Date : 2024-10-01 DOI: 10.1016/j.jcomc.2024.100533

Mojtaba Gorji Azandariani , Mehdi Vajdian , Mehrdad Javadi , Ali Parvari

This study investigates of using recycled concrete aggregates along with the reinforcement of polyolefin fibers to augment both the compressive strength and durability of concrete, in alignment with the principles of sustainable development. This study experimentally investigated the compressive strengths and durability of composite polyolefin fiber-reinforced recycled aggregate concrete (PFRRAC) exposed to chloride and acidic environments. For this purpose, 150 cubic concrete samples of 100 × 100 × 100 mm with various combinations of recycled aggregates and polyolefin fibers were made and subjected to axial compressive loading. The results show that the addition of fibers significantly enhances the compressive strength of concrete, with an increase of up to 34.36 % at 5 % fiber content. However, increasing the proportion of recycled aggregates reduces the compressive strength, with reductions ranging from 21.12 % to 43.85 % as the recycled aggregate content rises to 70 %. Moreover, the combination of fibers and recycled aggregates demonstrates potential for improving the sustainability and durability of concrete under challenging environmental conditions, particularly in chloride and acidic environments. In acidic environments, the inclusion of fibers significantly enhances the resistance to strength reduction. Furthermore, the study uncovers that a higher concentration of recycled aggregates exacerbates the reduction in strength in chloride-rich settings, emphasizing the imperative nature of meticulous mix design and material selection. The findings for the integration of even minor quantities of polyolefin fibers to amplify the performance and sustainability of concrete mixtures, especially when utilizing recycled aggregates, thus promoting eco-friendly construction practices.

本研究探讨了使用再生混凝土骨料和聚烯烃纤维增强材料来提高混凝土的抗压强度和耐久性，以符合可持续发展的原则。本研究通过实验研究了暴露在氯化物和酸性环境中的复合聚烯烃纤维增强再生骨料混凝土（PFRRAC）的抗压强度和耐久性。为此，我们制作了 150 个 100 × 100 × 100 毫米的立方体混凝土样品，其中包含不同组合的再生骨料和聚烯烃纤维，并对其进行轴向抗压加载。结果表明，添加纤维可显著提高混凝土的抗压强度，纤维含量为 5% 时，抗压强度最高可提高 34.36%。然而，增加再生骨料的比例会降低抗压强度，当再生骨料含量增加到 70% 时，抗压强度会降低 21.12% 到 43.85%。此外，纤维和再生骨料的组合还显示出在具有挑战性的环境条件下，特别是在氯化物和酸性环境中，改善混凝土可持续性和耐久性的潜力。在酸性环境中，纤维的加入大大增强了抗强度降低的能力。此外，研究还发现，在富含氯化物的环境中，较高浓度的再生骨料会加剧强度的降低，从而强调了精心设计混合料和选择材料的必要性。研究结果表明，即使是少量的聚烯烃纤维，也能提高混凝土混合物的性能和可持续性，尤其是在使用再生骨料的情况下，从而促进生态友好型建筑实践。

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引用次数: 0

Hybrid lattice structure with micro graphite filler manufactured via additive manufacturing and growth foam polyurethane 通过增材制造和生长泡沫聚氨酯制造出带有微石墨填料的混合晶格结构

IF 5.3 Q2 MATERIALS SCIENCE, COMPOSITES

Composites Part C Open Access

Pub Date : 2024-10-01 DOI: 10.1016/j.jcomc.2024.100516

Fefria Tanbar , Alvin Dio Nugroho , Ariyana Dwiputra Nugraha , Seno Darmanto , Djarot Widagdo , Gil N.C. Santos , Muhammad Akhsin Muflikhun

The utilisation of lightweight structures is a common practice across a range of disciplines, including the construction of light steel frames, sandwich panels, and transportation infrastructure, among others. The advantages of lightweight structures include design flexibility, weight reduction, and the sustainability of materials that can be easily recycled. However, these advantages also present significant weaknesses. Compared to solid materials with compact weight, lightweight structures do not have the same characteristics. With the reduction in material weight, the strength of the lightweight structure decreases significantly compared to solid materials. In this study, the lightweight structure was made using additive manufacturing and reinforced with solid Composite Polyurethane Foam reinforced with graphite filler expanded into the lightweight structure. The results showed that in the compression test, the mixture with 2 % graphite filler had the highest value of 2.5 kN. The highest hardness test on the specimen with a 2 % graphite mixture was 19.8 HA. FT-IR testing showed that the carbon bonds from graphite in the 2 % specimen had the highest intensity. The test results showed that the addition of Polyurethane Foam into the structure could enhance material strength effectively without adding significant material weight.

轻质结构的应用在各个领域都很普遍，包括轻钢结构、夹芯板和交通基础设施等。轻质结构的优点包括设计灵活、重量减轻以及材料易于回收的可持续性。然而，这些优点也存在明显的缺点。与重量紧凑的固体材料相比，轻质结构不具备相同的特性。随着材料重量的减轻，轻质结构的强度与实心材料相比明显下降。本研究利用增材制造技术制作了轻质结构，并用固体复合聚氨酯泡沫增强石墨填料膨胀到轻质结构中。结果表明，在压缩试验中，含有 2% 石墨填料的混合物的压缩值最高，为 2.5 kN。含有 2% 石墨混合物的试样的最高硬度测试值为 19.8 HA。傅立叶变换红外测试表明，2% 的试样中石墨的碳键强度最高。测试结果表明，在结构中添加聚氨酯泡沫可有效提高材料强度，而不会增加大量材料重量。

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引用次数: 0

A review of repairing heat-damaged RC beams using externally bonded- and near-surface mounted-CFRP composites 使用外部粘接和近表面安装的纤维增强塑料复合材料修复热损伤 RC 梁的综述

IF 5.3 Q2 MATERIALS SCIENCE, COMPOSITES

Composites Part C Open Access

Pub Date : 2024-10-01 DOI: 10.1016/j.jcomc.2024.100519

Mousa Shhabat , Mohammad Al-Zu'bi , Mu'tasim Abdel-Jaber

Despite numerous investigations conducted in the field and the evident importance of this area of study, comprehensive reviews are still lacking, resulting in a noticeable gap in comprehension. Therefore, this paper presents an in-depth review of repair methods for heat-damaged reinforced concrete (RC) beams utilizing carbon fibre-reinforced polymer (CFRP) composites through both externally bonded reinforcement (EBR) and near-surface mounted (NSM) techniques. The paper meticulously compiles and analyses relevant experimental data, examining flexural and shear repair mechanisms, associated failure modes and factors influencing the repair processes, such as the form, length, spacing, orientation and number of CFRP reinforcement layers, as well as the type of bonding agent. Thus, this review serves as a valuable resource and guide for engineers and researchers seeking to deepen their knowledge in this field.

The review concludes with recommendations for future research directions aimed at advancing the development and application of repair technologies for heat-damaged RC members.

尽管在该领域进行了大量研究，而且该研究领域的重要性显而易见，但仍然缺乏全面的综述，因此在理解方面存在明显差距。因此，本文通过外部粘接加固（EBR）和近表面安装（NSM）技术，对利用碳纤维增强聚合物（CFRP）复合材料修复热损伤钢筋混凝土（RC）梁的方法进行了深入评述。论文对相关实验数据进行了细致的汇编和分析，研究了弯曲和剪切修复机制、相关失效模式以及影响修复过程的因素，如 CFRP 加固层的形式、长度、间距、方向和数量，以及粘接剂的类型。因此，本综述可作为工程师和研究人员深化该领域知识的宝贵资源和指南。综述最后提出了未来研究方向的建议，旨在推进热损伤 RC 构件修复技术的开发和应用。

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引用次数: 0

A machine learning enhanced characteristic length method for failure prediction of open hole tension composites 用于开孔拉伸复合材料失效预测的机器学习增强特征长度法

IF 5.3 Q2 MATERIALS SCIENCE, COMPOSITES

Composites Part C Open Access

Pub Date : 2024-10-01 DOI: 10.1016/j.jcomc.2024.100524

Omar A.I. Azeem, Silvestre T. Pinho

The characteristic length method is a non-local approach to predicting the failure of open and closed-hole composite features. This method requires the determination of the linear elastic stress field of the composite laminate at its failure load. Typically, this requires computationally expensive progressive damage and linear elastic modelling and simulation with finite element analysis (FEA). In this study, we demonstrate the benefit of machine learning methods to efficiently and accurately predict characteristic lengths of composite laminates with open holes. We find that the prediction of the load-displacement profile usefully informs ultimate failure load prediction. We also find that linear elastic stress fields are more accurately predicted using a long-short term memory neural network rather than a convolutional decoder neural network. We show indirect prediction of characteristic length, via prediction of failure loads and linear elastic stress fields independently, results in more flexible, interpretable and accurate results than direct prediction of characteristic length, given sufficient training data. Our machine learning-assisted characteristic length method shows over five orders of magnitude of time-saving benefit compared to FEA-based methods.

特征长度法是一种预测开孔和闭孔复合材料失效的非局部方法。这种方法需要确定复合材料层压板在失效载荷下的线性弹性应力场。通常，这需要计算昂贵的渐进损伤和线性弹性建模，并通过有限元分析（FEA）进行模拟。在本研究中，我们展示了机器学习方法在高效、准确地预测开孔复合材料层压板特征长度方面的优势。我们发现，对载荷-位移曲线的预测有助于最终失效载荷的预测。我们还发现，使用长短期记忆神经网络而不是卷积解码器神经网络能更准确地预测线性弹性应力场。我们表明，在有足够训练数据的情况下，通过独立预测破坏载荷和线性弹性应力场来间接预测特征长度，比直接预测特征长度的结果更灵活、更可解释、更准确。与基于有限元分析的方法相比，我们的机器学习辅助特征长度方法可节省五个数量级以上的时间。

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引用次数: 0

Experimental study to unraveling the seismic behavior of CFRP retrofitting composite coupled shear walls for enhanced resilience 揭示 CFRP 加固复合耦合剪力墙抗震行为的实验研究

IF 5.3 Q2 MATERIALS SCIENCE, COMPOSITES

Composites Part C Open Access

Pub Date : 2024-10-01 DOI: 10.1016/j.jcomc.2024.100523

Mohammad Meghdadian , Amir R. Masoodi , Mansour Ghalehnovi

This study focuses on the empirical examination of the nonlinear seismic performance of carbon fiber-reinforced polymer (CFRP)-strengthened composite coupled reinforced concrete (RC) shear walls. The experimental setup involves testing the structure in two distinct states, wherein CFRP sheets are utilized for retrofitting and reinforcement. In the initial phase, three samples undergo reinforcement utilizing distinct patterns of CFRP sheets. In the subsequent stage, an additional trio of specimens is fabricated and tested without the application of CFRP sheets. Subsequently, all structures are exposed to a load equivalent to 60 % of their flexural capacity. Following this, the tested specimens undergo retrofitting with CFRP sheets, utilizing the same patterns as in the initial phase. The retrofitted composite coupled shear walls are then subjected to retesting. The principal aim of CFRP retrofitting is to amplify the flexural and shear capacities of the specimens, empowering them to endure heightened seismic loads in comparison to their original configurations. This research contributes by evaluating ductility, ultimate strength, energy dissipation, and construction costs associated with composite coupled steel plate-concrete shear walls. All specimens underwent cyclic loading in accordance with the ATC-24 guidelines [1], which provide standard protocols for testing the cyclic performance of structural components. These guidelines, outline procedures for simulating seismic loading conditions in laboratory settings to evaluate the performance of structural systems under cyclic loading. Finally, a parametric study explores the impact of CFRP sheets and their adhesion patterns on the seismic behavior of composite coupled shear walls. The selection of the optimal retrofitting scheme considers the construction cost of each specimen based on the total area of CFRP sheets utilized.

本研究的重点是对碳纤维增强聚合物（CFRP）加固复合耦合钢筋混凝土（RC）剪力墙的非线性抗震性能进行实证检验。实验设置包括在两种不同状态下对结构进行测试，其中 CFRP 片材用于改造和加固。在初始阶段，三个样本利用不同模式的 CFRP 片材进行加固。在随后的阶段，在不使用 CFRP 片材的情况下，制作并测试另外三个试样。随后，所有结构都承受了相当于其抗弯能力 60% 的荷载。之后，利用与初始阶段相同的模式，对测试过的试样加装 CFRP 片材。然后对加装的复合耦合剪力墙进行重新测试。加装 CFRP 的主要目的是提高试样的抗弯和抗剪能力，使其能够承受比原始结构更高的地震荷载。本研究通过评估与钢板-混凝土复合材料耦合剪力墙相关的延展性、极限强度、能量消耗和建筑成本，为本研究做出了贡献。所有试样都按照 ATC-24 准则[1]进行了循环加载，该准则为测试结构部件的循环性能提供了标准协议。这些指南概述了在实验室环境中模拟地震加载条件的程序，以评估结构系统在循环加载下的性能。最后，一项参数研究探讨了 CFRP 片材及其粘合模式对复合材料耦合剪力墙抗震性能的影响。在选择最佳改造方案时，考虑了基于所使用的 CFRP 片材总面积的每个试样的施工成本。

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引用次数: 0