Composites Science and Technology最新文献_第6页

3D printing, leakage-proof, and flexible phase change composites for thermal management application 用于热管理应用的三维打印、防漏和柔性相变复合材料

IF 8.3 1区材料科学 Q1 MATERIALS SCIENCE, COMPOSITES

Composites Science and Technology

Pub Date : 2024-10-10 DOI: 10.1016/j.compscitech.2024.110905

Siyuan Qiu , Yajiao Li , Yi An , Wenhao Wang , Yuanmin Chen , Ke Chen , Daming Wu , Jingyao Sun

Phase change composites (PCCs) have attracted much attention in the fields of thermal management due to their high latent heat. However, their risk of leakage and poor shape designability greatly limit their industrial applications. Therefore, there is an urgent need to develop leakage-proof and customizable PCCs to meet the emerging requirements of thermal management applications. Some scholars have proposed the concept of preparing PCCs by 3D printing technology, aiming to meet customized thermal management requirements of various electronic devices. Nevertheless, the phase change material leaking of PCCs under high temperature is still a tough problem to solve. In this study, expanded graphite (EG) is used as the carrier for paraffin wax (PW), which names as EP can tightly enveloping PW in its porous structure. Then, an innovative carbomer gel ink is prepared for 3D printing using EP and short carbon fiber (SCF) as thermal conductive fillers. Freeze-drying and polydimethylsiloxane (PDMS) infiltrating procedures are furtherly performed to ensure the flexibility of final PCCs samples. A maximum thermal conductivity of 2.89 W/(m·K) is obtained when the content of SCF/EP filler is 10 wt%. Importantly, the flexible PCCs prepared through this method effectively prevent the PW leaking during thermal management applications, thereby avoiding the consequent safety risks and enhancing the lifespan of electronic devices. This work opens up a promising pathway for the rapid fabrication of leakage-proof, customizable and flexible PCCs.

相变复合材料（PCC）因其高潜热而在热管理领域备受关注。然而，其泄漏风险和形状可设计性差极大地限制了其工业应用。因此，迫切需要开发防泄漏和可定制的 PCC，以满足热管理应用的新要求。一些学者提出了利用 3D 打印技术制备 PCC 的概念，旨在满足各种电子设备的定制化热管理要求。然而，PCC 在高温条件下的相变材料泄漏仍是一个亟待解决的难题。在这项研究中，膨胀石墨（EG）被用作石蜡（PW）的载体，EG的名称是EP，因为EP可以在其多孔结构中紧密包裹PW。然后，使用 EP 和短碳纤维（SCF）作为导热填料，制备了一种用于 3D 打印的创新卡波姆凝胶墨水。为了确保最终 PCCs 样品的柔韧性，还进一步进行了冷冻干燥和聚二甲基硅氧烷（PDMS）浸润程序。当 SCF/EP 填料的含量为 10 wt% 时，最大导热系数为 2.89 W/(m-K)。重要的是，通过这种方法制备的柔性 PCC 能有效防止 PW 在热管理应用中泄漏，从而避免了由此带来的安全风险，并延长了电子设备的使用寿命。这项工作为快速制备防漏、可定制和柔性 PCC 开辟了一条前景广阔的途径。

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引用次数: 0

Crushing behavior of GFRP composite-reinforced PVC tubes: Experimental testing and numerical simulation GFRP 复合材料增强 PVC 管的挤压行为：实验测试和数值模拟

IF 8.3 1区材料科学 Q1 MATERIALS SCIENCE, COMPOSITES

Composites Science and Technology

Pub Date : 2024-10-10 DOI: 10.1016/j.compscitech.2024.110903

Khaled Yousif , Aamir Dean , Elsadig Mahdi

This paper introduces glass fiber reinforced polymer (GFRP)-reinforced Polyvinyl Chloride (PVC) tubes, both corrugated and non-corrugated, designed as energy absorber devices. The PVC tubes were externally and internally reinforced with GFRP composite oriented at

\pm 4 5^{\circ}

and subjected to quasi-static axial compression tests. Results indicated that all reinforced tubes exhibited significantly higher load-bearing capacity, energy absorption (EA) capability, and crushing force efficiency (CFE) compared to standard PVC tubes. Among the tested specimens, externally reinforced corrugated tubes demonstrated the highest specific energy absorption (SEA), surpassing other configurations by 17.5 kJ/kg when considering both pre- and post-crushing stages combined. However, these corrugated specimens showed instability during crushing, reflected in poor instantaneous crush force efficiency (iCFE) and the lowest iCFE among the composite tubes, with an average decrease of 43.59%.

The corrugation notably increased the initial peak load, enhancing energy absorption in the pre-crushing stage without compromising the stability of crush force efficiency. Additionally, the combination of external and internal reinforcement significantly improved CFE and iCFE. Consequently, the PVC tubes combining corrugation with both external and internal reinforcement emerged as the best-performing configuration among all tested tubes.

Furthermore, a 3D Finite Element (FE) model was developed using ABAQUS FE code with user-defined subroutines to simulate the crushing process. The constitutive models and numerical procedures employed are detailed. The FE model’s predictions showed a satisfactory correlation with experimental results, providing valuable insights into the crushing mechanics and offering a predictive tool for future design optimizations.

本文介绍了玻璃纤维增强聚合物（GFRP）增强聚氯乙烯（PVC）管，包括波纹管和非波纹管，设计用作能量吸收装置。用取向为 ±45∘ 的 GFRP 复合材料对 PVC 管进行外部和内部增强，并对其进行准静态轴向压缩试验。结果表明，与标准聚氯乙烯管相比，所有增强管的承载能力、能量吸收（EA）能力和破碎力效率（CFE）都明显更高。在测试的试样中，外部加固的波纹管表现出最高的比能量吸收能力（SEA），在考虑破碎前和破碎后阶段的情况下，比其他结构的试样高出 17.5 kJ/kg。然而，这些波纹试样在破碎过程中表现出不稳定性，表现为瞬时破碎力效率（iCFE）较差，在复合管中 iCFE 最低，平均下降 43.59%。此外，外部和内部加固的结合也显著提高了 CFE 和 iCFE。此外，还使用 ABAQUS FE 代码和用户自定义子程序开发了三维有限元（FE）模型，以模拟挤压过程。详细介绍了所采用的构成模型和数值计算程序。有限元模型的预测结果与实验结果之间的相关性令人满意，为破碎力学提供了宝贵的见解，并为未来的设计优化提供了预测工具。

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引用次数: 0

Fatigue-creep damage model for carbon fibre reinforced composites under high temperature cyclic loading 高温循环加载下碳纤维增强复合材料的疲劳-蠕变损伤模型

IF 8.3 1区材料科学 Q1 MATERIALS SCIENCE, COMPOSITES

Composites Science and Technology

Pub Date : 2024-10-10 DOI: 10.1016/j.compscitech.2024.110909

Yi-Er Guo , De-Guang Shang , Lin-Xuan Zuo , Lin-Feng Qu , Chao-Lin Chen

In this paper, a fatigue-creep damage model that can take into account the interaction of fatigue and creep damage is proposed under high temperature cyclic loading. In the proposed model, the effect of temperature on creep damage, the variation of creep damage under different high temperature cyclic loading conditions, and fatigue-creep interaction damage are considered. In addition, in order to accurately describe the creep behavior of unidirectional laminates with different orientations, the damage mechanism of unidirectional laminates was also analyzed. The creep and fatigue test results at different temperatures showed that the proposed creep rupture time model and the fatigue-creep damage model considering the damage mechanisms can successfully predict the creep and fatigue lives of unidirectional laminates at high temperature, and the prediction results are in good agreement with the experimental data.

本文提出了一种疲劳-蠕变损伤模型，该模型可考虑高温循环加载条件下疲劳与蠕变损伤的相互作用。在所提出的模型中，考虑了温度对蠕变损伤的影响、不同高温循环加载条件下蠕变损伤的变化以及疲劳-蠕变交互损伤。此外，为了准确描述不同取向单向层压板的蠕变行为，还分析了单向层压板的损伤机理。不同温度下的蠕变和疲劳试验结果表明，所提出的蠕变断裂时间模型和考虑损伤机理的疲劳-蠕变损伤模型可以成功预测单向层压板在高温下的蠕变和疲劳寿命，预测结果与实验数据吻合良好。

引用次数: 0

Thermal reaction based mesoscale ablation model for phase degradation and pyrolysis of needle-punched composite 基于热反应的针刺复合材料相降解和热解中尺度烧蚀模型

IF 8.3 1区材料科学 Q1 MATERIALS SCIENCE, COMPOSITES

Composites Science and Technology

Pub Date : 2024-10-09 DOI: 10.1016/j.compscitech.2024.110898

Yu Chen , Ran Tao , Yiqi Mao

Needle-punched composites are highly valued for their exceptional resistance to interlaminar properties, ablation, and design flexibility, making them increasingly popular in aerospace thermal protection systems. This work investigates the mesoscale structural characteristics and thermophysical properties of needle-punched composites in ablation process. Oxyacetylene ablation experiments were carried out at different temperatures, and a mesoscopic needle-punched structure model was established based on the results of CT characterization. Further, Abaqus custom subroutine was used to reveal the ablation evolution mechanism of carbon fiber reinforced phenolic resin-based needle-punched composites. The results show that, at mesoscopic scale, the acicular fiber bundle perpendicular to the ablative surface accelerates the heat conduction to the interior of the material and promotes the thermal damage and performance degradation of the composite.

针刺复合材料因其优异的层间抗性、耐烧蚀性和设计灵活性而备受推崇，在航空航天热防护系统中越来越受欢迎。本研究探讨了针刺复合材料在烧蚀过程中的中尺度结构特征和热物理性能。在不同温度下进行了氧乙炔烧蚀实验，并根据 CT 表征结果建立了中观针刺结构模型。此外，还利用 Abaqus 自定义子程序揭示了碳纤维增强酚醛树脂基针刺复合材料的烧蚀演化机理。结果表明，在中观尺度上，垂直于烧蚀表面的针状纤维束加速了向材料内部的热传导，促进了复合材料的热损伤和性能退化。

引用次数: 0

Fraction-dependent filler network in silicone rubber: Unraveling abrupt enhancement in rheological properties via solvent extraction and DLS study 硅橡胶中取决于馏分的填料网络：通过溶剂萃取和 DLS 研究揭示流变特性的突然增强

IF 8.3 1区材料科学 Q1 MATERIALS SCIENCE, COMPOSITES

Composites Science and Technology

Pub Date : 2024-10-09 DOI: 10.1016/j.compscitech.2024.110895

Qiuyu Long , Longjin Huang , Xueyan Zhao , Yuying Li , Yewei Xu , Yi Sun , Chunhua Zhu , Yu Liu

A pivotal nanofiller network will be constructed by the filler loading threshold inside the silicone rubber, leading to abrupt enhancement in the rheological properties of the composites. However, the contribution of the nanofiller network to the performance mutation is poorly understood due to lack of direct evidence to recognize the formation of filler networks. This work quantitatively investigated the filler aggregation network of solvent-extracted monodisperse silica-filled polydimethylsiloxane (PDMS) composites to interpret the rheological properties. The results indicated that, when filler loadings reach 60 phr, the size of the filler network reaches its maximum (1280.5 nm), significantly increasing the storage modulus (166 kPa) and Payne effect (163 kPa), due to the formation of a filler network confirmed by Dynamic Light Scattering (DLS) and scanning electron microscope (SEM) observation. The reduction in aggregate size observed with longer extraction times is because of the collapse of the nanofiller network, which occurs as the polymer chains are removed. The aggregates reappear in a monodisperse form as the extraction duration reaches 20 days. This confirms that filler aggregates of interconnected polymer chains can form a well-developed network structure that effectively supports and transfers stresses. This contributes to an in-depth understanding of the formation mechanism of nanofiller networks, aiding the advancement of high-performance polymer nanocomposites.

硅橡胶内部的填料负载阈值将构建一个关键的纳米填料网络，从而导致复合材料流变特性的突然增强。然而，由于缺乏识别填料网络形成的直接证据，人们对纳米填料网络对性能突变的贡献知之甚少。本研究定量研究了溶剂萃取单分散二氧化硅填充聚二甲基硅氧烷（PDMS）复合材料的填料聚集网络，以解释其流变特性。结果表明，当填料负载量达到 60 phr 时，填料网络的尺寸达到最大值（1280.5 nm），显著提高了存储模量（166 kPa）和佩恩效应（163 kPa），这是因为动态光散射（DLS）和扫描电子显微镜（SEM）观察证实了填料网络的形成。随着萃取时间的延长，观察到的聚合体尺寸减小，这是因为聚合物链被去除后，纳米填料网络发生了坍塌。当萃取时间达到 20 天时，聚集体重新以单分散形式出现。这证实了由相互连接的聚合物链组成的填料聚集体可以形成发达的网络结构，从而有效地支撑和传递应力。这有助于深入了解纳米填料网络的形成机理，从而推动高性能聚合物纳米复合材料的发展。

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引用次数: 0

Investigations on the leak resistance performance and the difference mechanism of composite materials under several typical curing processes 几种典型固化工艺下复合材料的抗渗漏性能和差异机理研究

IF 8.3 1区材料科学 Q1 MATERIALS SCIENCE, COMPOSITES

Composites Science and Technology

Pub Date : 2024-10-09 DOI: 10.1016/j.compscitech.2024.110901

Shu Liu , Lihua Zhan , Bolin Ma , Weitao Chen , Dechao Zhang , Shunming Yao , Chuan Du

This study aims to investigate the leak resistance of carbon fiber composite products formed by various typical curing processes. Firstly, the leak rates of specimens produced through different curing methods were measured, and the defect were statistically analyzed. After that, the simulation approach was applied to numerically study the impact of these defect characteristics on leak rates was examined from the three factors of porosity, void distribution and void morphology, specimen with prefabricated defects was prepared, and its leak performance were tested to validate the simulation results. Finally, the differences in leak resistance among specimens under different curing processes were analyzed from the perspective of curing defects, and specific defect characteristics contributing to enhanced leak resistance were identified.

本研究旨在探讨采用各种典型固化工艺制成的碳纤维复合材料产品的抗渗漏性。首先，测量了不同固化方法生产的试样的泄漏率，并对缺陷进行了统计分析。然后，应用模拟方法从孔隙率、空隙分布和空隙形态三个因素数值研究了这些缺陷特征对泄漏率的影响，并制备了带有预制缺陷的试样，测试了其泄漏性能以验证模拟结果。最后，从固化缺陷的角度分析了不同固化工艺下试样抗渗漏性的差异，并确定了有助于提高抗渗漏性的具体缺陷特征。

引用次数: 0

Experimental and numerical validation of high strain rate impact response and progressive damage of 3D orthogonal woven composites 三维正交编织复合材料高应变率冲击响应和渐进损伤的实验和数值验证

IF 8.3 1区材料科学 Q1 MATERIALS SCIENCE, COMPOSITES

Composites Science and Technology

Pub Date : 2024-10-05 DOI: 10.1016/j.compscitech.2024.110896

Xue Yang , Dian-sen Li , Xiao-long Jia , Hong-mei Zuo , Lei Jiang , Stepan V. Lomov , Frederik Desplentere

Advanced three-dimensional (3D) woven composites for aerospace and automotive applications are commonly subjected to complex dynamic environments involving vibrations and impacts, resulting in examining their impact properties is extremely important. This paper first experimentally discussed the influences of strain rates, weft yarn densities and loading directions on the impact performances and failure mechanisms of 3D orthogonal woven composites (3DOWCs). Secondly, full-scale finite element models were developed to predict the stress distribution and interfacial damage evolution process. The predictions were well in agreement with the experimental results. This research revealed that the impact characteristics exhibited strain rate sensitivity. With increasing weft yarn densities, the high strain rate impact behaviors also improved. Particularly, the warp impact strength of 3DOWCs with a weft yarn density of 2 yarn/cm (W5-2) at 812 s⁻¹ was 17.4% and 24.0% higher than that of 3DOWCs with a weft yarn density of 1.5 yarn/cm (W5-1) at 822 s⁻¹. Meanwhile, warp impact strength consistently exceeded to that of the weft impact strength. Additionally, strain rates, weft yarn densities, and loading directions dramatically affected the stress distribution and interfacial damage evolution process of 3DOWCs. Significant warp yarns fracture and matrix cracking were the principal failure patterns in the warp impact, whereas the damage in the weft impact was dominated by localized fracture of weft yarns and interfacial debonding.

应用于航空航天和汽车领域的先进三维（3D）编织复合材料通常会受到振动和冲击等复杂动态环境的影响，因此研究其冲击性能极为重要。本文首先通过实验讨论了应变率、纬纱密度和加载方向对三维正交编织复合材料（3DOWC）冲击性能和破坏机制的影响。其次，建立了全尺寸有限元模型来预测应力分布和界面损伤演变过程。预测结果与实验结果十分吻合。研究发现，冲击特性具有应变速率敏感性。随着纬纱密度的增加，高应变速率冲击行为也得到了改善。特别是纬纱密度为 2 纱/厘米（W5-2）的 3DOWC 在 812 s-1 下的经纱冲击强度比纬纱密度为 1.5 纱/厘米（W5-1）的 3DOWC 在 822 s-1 下的经纱冲击强度分别高出 17.4% 和 24.0%。同时，经纱冲击强度一直超过纬纱冲击强度。此外，应变速率、纬纱密度和加载方向也对 3DOWC 的应力分布和界面损伤演变过程产生了显著影响。经向冲击的主要破坏形式是经纱明显断裂和基体开裂，而纬向冲击的破坏主要是纬纱局部断裂和界面脱粘。

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引用次数: 0

Synergistic enhancement of magic triangle properties of PC tread stocks modified by amine-capped trans-1,4-poly (butadiene-co-isoprene) 通过胺封端反式-1,4-聚（丁二烯-共异戊二烯）改性聚碳酸酯胎面料，协同增强其神奇三角特性

IF 8.3 1区材料科学 Q1 MATERIALS SCIENCE, COMPOSITES

Composites Science and Technology

Pub Date : 2024-10-05 DOI: 10.1016/j.compscitech.2024.110899

Shufang Luo , Kaixuan Dong , Shuo Wang, Aihua He

The development of high-performance “green tires” with synergistically improved “magic triangle” properties like lower rolling resistance, higher wet-skid resistance and higher abrasion resistance has always been a hot issue. In this work, an effective strategy for developing high-performance “green tires” with simultaneously improved “magic triangle” properties of solution-polymerized styrene-butadiene rubber (SSBR)/cis-1,4-polybutadiene rubber (BR) nanocomposites modified by amine-capped trans-1,4-poly(butadiene-co-isoprene) copolymers (F-TBIR) was proposed. A series of F-TBIR with 10–60 mol% amine-capped efficiency (CE) and 30-90 × 10⁴ weight-average molecular weight (M_w) were synthesized by using heterogeneous TiCl₄/MgCl₂–Al(i-Bu)₃ Ziegler-Natta catalyst with dicyclohexylamine (DCHA) as chain transfer agent (CTA). With the increase in CE of F-TBIR, the silica-filled SSBR/BR/F-TBIR compounds exhibited improved green strength, modulus at 100 % elongation and bound rubber, and their vulcanizates showed synergistically improved “magic triangle” properties like obviously reduced rolling resistance and abrasion loss, and increased wet-skid resistance. It was found that the incorporation of 10 phr F-TBIR3 with CE of 60 mol% and M_w of 32 × 10⁴ resulted in highly expected properties of the SSBR/BR/F-TBIR3 nanocomposite. The contribution mechanism of F-TBIR3 was discussed based on the improvements of polymer network structures and filler network structures. This work is expected to provide an effective strategy to construct the desired network structures for high-performance rubber composites.

开发具有协同改善 "神奇三角 "特性的高性能 "绿色轮胎"，如更低的滚动阻力、更高的湿滑阻力和更高的耐磨性，一直是一个热点问题。本研究提出了一种有效的策略，利用胺封端反式-1,4-聚（丁二烯-异戊二烯）共聚物（F-TBIR）改性的溶液聚合丁苯橡胶（SSBR）/顺式-1,4-聚丁二烯橡胶（BR）纳米复合材料，开发具有同时改善 "神奇三角 "性能的高性能 "绿色轮胎"。采用异相 TiCl4/MgCl2-Al(i-Bu)3 Ziegler-Natta 催化剂，以二环己胺（DCHA）为链转移剂（CTA），合成了一系列胺封端效率（CE）为 10-60 mol%、重量平均分子量（Mw）为 30-90 × 104 的 F-TBIR。随着 F-TBIR CE 的增加，二氧化硅填充的 SSBR/BR/F-TBIR 复合物的生坯强度、100% 拉伸模量和结合橡胶性能均有所提高，其硫化胶的 "神奇三角 "性能也得到了协同改善，如滚动阻力和磨损损耗明显降低，耐湿滑性能提高。研究发现，掺入 10 phr F-TBIR3（CE 为 60 mol%，Mw 为 32 × 104）后，SSBR/BR/F-TBIR3 纳米复合材料具有非常理想的性能。基于聚合物网络结构和填料网络结构的改进，讨论了 F-TBIR3 的贡献机制。这项工作有望为构建高性能橡胶复合材料所需的网络结构提供有效策略。

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引用次数: 0

Micromechanical analyses of unidirectional (UD) discontinuous flax fiber reinforced composites 单向（UD）非连续亚麻纤维增强复合材料的微机械分析

IF 8.3 1区材料科学 Q1 MATERIALS SCIENCE, COMPOSITES

Composites Science and Technology

Pub Date : 2024-10-05 DOI: 10.1016/j.compscitech.2024.110893

Yuan Yao , Yucheng Zhong , Zhoucheng Su , Ridha Muhammad , Dan Wang , Yiquan Li , Shuxin Li , Guangyong Sun

Prediction of the strength and damage behavior of natural fiber composites is a challenging task due to computational difficulties resulting from large fiber aspect ratio, non-uniform fiber length distribution, and interface modelling. A computational micromechanical model, which solves the above-mentioned challenges by incorporating a novel representative volume element (RVE) generation algorithm inspired by Lennard-Jones potential, is developed to predict the tensile behavior of unidirectional (UD) flax/epoxy composites. Effects of fiber aspect ratio, fiber spatial distribution, interfacial and matrix properties on longitudinal modulus, strength, and the damage behavior of the flax/epoxy composites are extensively studied using the numerical model. The modulus and strength predicted by numerical model were compared with both analytical models and experimental results, which not only validated the numerical model but identified the limitations of analytical model. The longitudinal strength of flax/epoxy composites initially increased with fiber aspect ratio. Upon reaching certain fiber aspect ratio (25 in this study), strength predicted by both RVE (RVEs with many fibers) and unit cell (unit cells with two fibers) are close to experimental value (240 MPa). This finding provides confidence and guidance on how to use simplified unit cells to predict the strength of natural fiber composites with acceptable accuracy and much lower computational cost.

由于纤维长宽比大、纤维长度分布不均匀以及界面建模等原因造成的计算困难，预测天然纤维复合材料的强度和损伤行为是一项具有挑战性的任务。受伦纳德-琼斯势能的启发，本研究开发了一种计算微观力学模型，通过采用一种新颖的代表体积元素（RVE）生成算法来解决上述难题，从而预测单向（UD）亚麻/环氧复合材料的拉伸行为。利用该数值模型广泛研究了纤维长径比、纤维空间分布、界面和基体特性对亚麻/环氧复合材料纵向模量、强度和损伤行为的影响。将数值模型预测的模量和强度与分析模型和实验结果进行了比较，不仅验证了数值模型，而且发现了分析模型的局限性。亚麻/环氧复合材料的纵向强度最初随纤维纵横比的增加而增加。当达到一定的纤维纵横比（本研究中为 25）时，RVE（多纤维 RVE）和单元格（双纤维单元格）预测的强度都接近实验值（240 兆帕）。这一发现为如何使用简化的单元格来预测天然纤维复合材料的强度提供了信心和指导，其精度可以接受，计算成本更低。

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引用次数: 0

Post impact flexural behavior investigation of hybrid foam-core sandwich composites at extreme Arctic temperature 极端北极温度下混合泡沫芯材夹层复合材料的冲击后挠曲行为研究

IF 8.3 1区材料科学 Q1 MATERIALS SCIENCE, COMPOSITES

Composites Science and Technology

Pub Date : 2024-10-05 DOI: 10.1016/j.compscitech.2024.110897

Faizan Mirza, Jason P. Mack, Arnob Banik, M.H. Khan, K.T. Tan

This study explores the post-impact bending behavior and failure mechanisms in hybrid sandwich composites made of Carbon Fiber Reinforced Polymer (CFRP) and Glass Fiber Reinforced Polymer (GFRP). Flexural tests conducted at both ambient room temperature and low temperature Arctic conditions reveal a significant enhancement in flexural performance when GFRP layer is incorporated on the outer side of the hybrid composite. The investigation utilizes images from testing to elucidate damage modes, including fiber and matrix cracking in the composite facesheet, as well as core shearing and debonding in the Polyvinyl Chloride (PVC) foam core. Residual flexural properties are notably influenced by stacking sequence, facesheet compressive properties, pre-existing impact damage and temperature conditions. Analytical predictions, validated experimentally, highlight the effect of stacking sequence, low temperature, and impact energy on flexural collapse modes, with competing failure modes such as indentation and core shear. Collapse maps indicate that room temperature specimens predominantly collapse through indentation, while diverse collapse mechanisms emerge due to facesheet thickness, rigidity, and degraded tensile strength. The study aims to provide fundamental insights for future composite designs tailored for Arctic applications.

本研究探讨了碳纤维增强聚合物（CFRP）和玻璃纤维增强聚合物（GFRP）混合夹层复合材料的冲击后弯曲行为和破坏机制。在室温和北极低温条件下进行的挠曲测试表明，在混合复合材料外侧加入玻璃纤维增强聚合物层后，挠曲性能显著提高。研究利用测试图像来阐明损坏模式，包括复合材料面层的纤维和基质开裂，以及聚氯乙烯（PVC）泡沫芯材的芯材剪切和脱粘。残余挠曲性能明显受到堆叠顺序、面片抗压性能、预先存在的冲击损伤和温度条件的影响。经实验验证的分析预测结果强调了堆叠顺序、低温和冲击能量对挠曲塌陷模式的影响，以及与之竞争的破坏模式，如压痕和芯材剪切。塌陷图显示，室温下的试样主要通过压痕塌陷，而由于面片厚度、刚度和抗拉强度下降，出现了多种塌陷机制。该研究旨在为未来针对北极应用的复合材料设计提供基本见解。

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引用次数: 0