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Durability of large-format additively manufactured polymer composite structures with environmental exposure–accelerated water immersion 环境暴露-加速浸水条件下大尺寸增材制造聚合物复合材料结构耐久性研究
IF 7 Q2 MATERIALS SCIENCE, COMPOSITES Pub Date : 2025-10-01 DOI: 10.1016/j.jcomc.2025.100659
Sunil Bhandari , Prabhat Khanal , Roberto A. Lopez-Anido
Large-format additive manufacturing (LFAM) of polymer composites enables rapid production of large-scale components for infrastructure, transportation, and defense. As these components see increased outdoor use, understanding their durability under moisture exposure is critical. This study evaluates the effects of water immersion on the durability of LFAM composites using three material systems: carbon fiber reinforced acrylonitrile butadiene styrene (CF-ABS), glass fiber reinforced polyethylene terephthalate glycol (GF-PETG), and wood flour reinforced amorphous polylactic acid (WF-aPLA). Specimens were fabricated using a pellet-fed extrusion-based LFAM process and immersed in water for 30, 60, and 90 days at three temperatures. Moisture uptake and mechanical degradation were assessed in both longitudinal and through-thickness orientations to capture the influence of interlayer interfaces. Results show that bio-based WF-aPLA absorbed significantly more moisture than petroleum-based CF-ABS and GF-PETG and exhibited ongoing degradation that prevented saturation. The most severe mechanical losses occurred in the through-thickness direction, where more interbead interfaces and voids were present. Longitudinal specimens showed better retention of strength and stiffness. Mechanical property degradation progressed in two stages: an initial rapid phase following an Arrhenius relationship with inverse temperature, and a slower secondary phase that deviated from this behavior. The findings demonstrate that both material selection and build orientation significantly affect moisture durability. While petroleum-based composites performed better overall, their durability remains influenced by LFAM-induced anisotropy. These results support material selection and predictive modeling for reliable LFAM structures in outdoor environments.
聚合物复合材料的大尺寸增材制造(LFAM)能够快速生产用于基础设施、交通和国防的大型部件。随着这些组件在户外使用的增加,了解它们在潮湿暴露下的耐久性至关重要。本研究采用碳纤维增强丙烯腈-丁二烯-苯乙烯(CF-ABS)、玻璃纤维增强聚对苯二甲酸乙二醇酯(GF-PETG)和木粉增强无定形聚乳酸(WF-aPLA)三种材料体系,评估了水浸泡对LFAM复合材料耐久性的影响。使用基于颗粒喂料挤压的LFAM工艺制作标本,并在三种温度下在水中浸泡30、60和90天。在纵向和全厚度方向上评估了吸湿性和机械退化,以捕捉层间界面的影响。结果表明,生物基WF-aPLA比石油基CF-ABS和GF-PETG吸收更多的水分,并表现出持续降解,防止饱和。最严重的机械损失发生在贯穿厚度方向,其中存在更多的界面和空洞。纵向试件表现出较好的强度和刚度保留。力学性能的退化分两个阶段进行:最初的快速阶段遵循Arrhenius与逆温度的关系,以及偏离这种行为的较慢的次级阶段。研究结果表明,材料选择和建筑朝向对防潮耐久性有显著影响。虽然石油基复合材料的总体性能更好,但其耐久性仍然受到lfam诱导的各向异性的影响。这些结果为室外环境中可靠的LFAM结构的材料选择和预测建模提供了支持。
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引用次数: 0
In-situ open-hole tensile testing and modeling of hybrid PEEK thermoplastic laminates under burn-through kerosene flame exposure 混合PEEK热塑性层压板在煤油火焰下的原位开孔拉伸试验与建模
IF 7 Q2 MATERIALS SCIENCE, COMPOSITES Pub Date : 2025-10-01 DOI: 10.1016/j.jcomc.2025.100657
Lanhui Lin , Benoit Vieille , Christophe Bouvet , Tanguy Davin
The objective of the present work is to investigate the thermo-mechanical behavior of open-hole hybrid carbon/glass fiber reinforced PolyEther Ether Ketone (CG/PEEK) thermoplastic laminate subjected to the kerosene flame exposure (1100 °C and 116 kW/m2 heat flux) in combination with tensile loading. A specialized flame testing bench has been developed, integrating a tensile mechanical loading and a kerosene burner, to induce in-situ fire-mechanical test conditions. The novel prototype has been employed to monitor the temporal evolution of several physical quantities in the range of fire exposure times up to 900 s, including back surface and through thickness temperature, open-hole deformation and swelling ratio of thickness. The mechanisms of fire- and mechanically-induced damage are examined through the fractographic analysis using tomography and microscopy. One-sided burn-through flame exposure causes the in-plane (4.0 K/mm) and through-thickness (40.1 K/mm) temperature gradients after 300 s. Compared to the virgin state, there is a considerable reduction in the equivalent stiffness (-67%) and axial strength (-55%) following a 900 s of flame exposure, indicating the severely damaged structural integrity. The modeling of the in-situ mechanical properties over multiple phase transition temperatures of the PEEK matrix is applied to characterize and ultimately predict the thermo-mechanical response of laminate under tensile loading in fire. The approach is based on the experimental measurement of mechanical properties over a wide temperature range (isothermal heating from the glass transition temperature to the PEEK matrix pyrolysis). The model shows a high degree of effectiveness in representing the in-situ open-hole tensile behavior of TP-based laminates under fire conditions as a function of flame exposure time.
本研究的目的是研究开孔混杂碳/玻璃纤维增强聚醚醚酮(CG/PEEK)热塑性层压板在煤油火焰(1100°C和116 kW/m2热流密度)和拉伸载荷联合作用下的热力学行为。研制了集拉伸机械载荷和煤油燃烧器为一体的专用火焰试验台,模拟了现场火焰力学试验条件。该新型原型已被用于监测火灾暴露时间长达900 s范围内的几个物理量的时间演变,包括背表面和穿过厚度温度、裸眼变形和厚度膨胀比。火灾和机械损伤的机制是通过断口分析,使用断层扫描和显微镜检查。在300秒后,单侧燃烧穿透火焰暴露会导致面内温度梯度(4.0 K/mm)和厚度温度梯度(40.1 K/mm)。与原始状态相比,在900秒的火焰暴露后,等效刚度(-67%)和轴向强度(-55%)显著降低,表明结构完整性严重受损。通过对PEEK基体在多个相变温度下的原位力学性能建模,表征并最终预测层合板在火灾中拉伸载荷下的热力学响应。该方法基于在宽温度范围内(从玻璃化转变温度到PEEK基体热解的等温加热)的机械性能的实验测量。该模型能够很好地描述tp基层压板在火灾条件下的原位开孔拉伸行为与火焰暴露时间的关系。
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引用次数: 0
Thermomechanical behaviour of 3D-printed carbon, glass, and aramid fibre-reinforced composites under heat exposure: Interlaminar failure perspective 热暴露下3d打印碳,玻璃和芳纶纤维增强复合材料的热力学行为:层间失效的观点
IF 7 Q2 MATERIALS SCIENCE, COMPOSITES Pub Date : 2025-10-01 DOI: 10.1016/j.jcomc.2025.100674
Ebrahim Rogha , Milad Bazli , Milad Shakiba , Caleb O. Ojo , Ali Rajabipour , Reza Hassanli , Mehrdad Arashpour , Hamish A Campbell
This study investigates the interlaminar shear strength (ILSS) of 3D-printed continuous carbon, glass, and Kevlar fibre-reinforced polymer (CFRP, GFRP, and AFRP) composites with an Onyx matrix exposed to elevated temperatures up to 200 °C. ILSS of CFRP and AFRP increased steadily up to 170 °C, peaking at 196 % and 203 % of baseline, respectively. This is driven by annealing and enhanced fibre–matrix reconsolidation. Both materials maintained high ILSS retention at 200 °C, with CFRP at 183 % and AFRP at 173 %. In contrast, GFRP exhibited a weaker response, with variable retention and a decrease in ILSS to 84 % of its baseline at 200 °C. These findings highlight the superior performance of CFRP and AFRP, which is attributed to enhanced interlaminar bonding and the thermal stability of their matrices, while GFRP’s performance was hindered by thermal cracking. The results show the importance of fibre selection for high-temperature applications, with CFRP demonstrating the best overall performance.
本研究研究了3d打印连续碳、玻璃和芳纶纤维增强聚合物(CFRP、GFRP和AFRP)复合材料的层间剪切强度(ILSS),这些复合材料的玛瑙基体暴露在高达200°C的高温下。CFRP和AFRP的ILSS在170°C时稳定增加,分别在基线的1966%和203%处达到峰值。这是由退火和增强的纤维基体再固结驱动的。两种材料在200°C时均保持较高的ILSS保留率,其中CFRP为183%,AFRP为173%。相比之下,GFRP表现出较弱的反应,在200°C时具有可变的保留和ILSS下降到其基线的84%。这些发现突出了CFRP和AFRP的优越性能,这归因于增强的层间结合和其基体的热稳定性,而GFRP的性能受到热开裂的阻碍。结果表明,高温应用中纤维选择的重要性,CFRP显示出最佳的综合性能。
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引用次数: 0
Development of a novel glass laminate with GFRP interlayers 新型玻璃钢夹层玻璃复合材料的研制
IF 7 Q2 MATERIALS SCIENCE, COMPOSITES Pub Date : 2025-10-01 DOI: 10.1016/j.jcomc.2025.100655
Feyza Nur Yildirim , Mithila Achintha
This paper presents establishment of materials and a fabrication method for fabrication of a new laminated glass type with a Glass Fibre Reinforced Polymer (GFRP) interlayer. The developed novel Glass–GFRP Laminate (GGL) is strong and ductile compared to contemporary PolyVinyl Butyral (PVB)-based laminated glasses. The paper shows that annealed glass and an acrylic-based clear casting resin at viscosity 300–400 mPa.s can be used to fabricate the Glass–GFRP Laminate (GGL) using a Modified Vacuum-Infusion-Process -based (MVIP) method. By carrying out a detailed experimental investigation focused on different glass and resin types, aspect ratio of the laminate specimens, GFRP thickness and number of GFRP layers, and humidity at fabrication, the key design parameters that ensure greater load resistance of the GGL (more than twice the load capacity and more than four times the flexural stiffness) compared to an equivalent thickness PVB-based laminated glass reference specimens are established and discussed in the paper. Finally, the results of percentage of passing of the visible light through the GGL specimens are investigated using a spectrometer. The percentage of passing of the visible light was determined to be 60–75 % and 50–60 % along the lateral and through-thickness directions of the laminate, respectively.
本文介绍了一种新型玻璃纤维增强聚合物夹层玻璃(GFRP)夹层玻璃的材料建立和制造方法。与现有的聚乙烯醇丁醛夹层玻璃相比,新型玻璃- gfrp夹层玻璃(GGL)具有很强的韧性。本文介绍了一种粘度为300 - 400mpa的退火玻璃和丙烯酸基透明浇注树脂。采用改进的真空灌注工艺(MVIP)方法制备玻璃-玻璃钢层压板(GGL)。通过对不同玻璃和树脂类型、层压试件的长宽比、玻璃钢厚度和玻璃钢层数以及制造时的湿度进行详细的实验研究,建立并讨论了与同等厚度的聚乙烯醇基夹层玻璃参考试件相比,确保GGL具有更大的抗载能力(载荷能力的两倍以上,抗弯刚度的四倍以上)的关键设计参数。最后,用分光计研究了可见光通过GGL样品的百分率。在层压板的横向和透厚方向上,可见光的透射率分别为60 - 75%和50 - 60%。
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引用次数: 0
Failure modes and energy absorption in Glass Reinforced aluminum (GLARE) hybrid laminates subjected to three-point bending 三点弯曲作用下玻璃增强铝复合材料层合板的失效模式和能量吸收
IF 7 Q2 MATERIALS SCIENCE, COMPOSITES Pub Date : 2025-10-01 DOI: 10.1016/j.jcomc.2025.100651
Shreyas Anand, Nachiket Dighe, Pranshul Gupta, René Alderliesten, Saullo G.P. Castro
This paper investigates 3-point bending failure of five different types of GLARE laminates (2A, 2B, 3, 4A and 4B). 73 configurations (419 specimens), with different stacking sequences and aluminum layer thicknesses are tested. Failure mechanisms, effect of stacking sequence, effect of aluminum rolling direction, effect of displacement rate and energy absorption are analyzed. Configurations with predominantly 0°glass fiber layers fail with delamination as the major failure mode, while configurations with predominantly 90°glass fiber layers fail with central cracking as the major failure mode. GLARE 3, with 1:1 ratio of 0°and 90°fibers, fail with an equal mix of delamination and central cracking. A semi-analytical framework that can be used to predict the force versus displacement curve for central cracking failure is proposed and validated.
本文研究了5种不同类型的眩光层压板(2A、2B、3、4A和4B)的三点弯曲破坏。测试了73种不同堆叠顺序和铝层厚度的配置(419个试样)。分析了失效机理、叠加顺序的影响、轧制方向的影响、位移率和能量吸收的影响。以0°玻璃纤维层为主的结构以分层为主要破坏模式,以90°玻璃纤维层为主的结构以中心开裂为主要破坏模式。0°和90°纤维比例为1:1的眩光3失效,分层和中心开裂的比例相等。提出并验证了可用于预测中心开裂破坏力-位移曲线的半解析框架。
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引用次数: 0
Assessing the impact of carbon nanotubes on the damping and parametric instability responses of glass fiber reinforced composite cylindrical shells 碳纳米管对玻璃纤维增强复合材料圆柱壳阻尼和参数失稳响应的影响
IF 7 Q2 MATERIALS SCIENCE, COMPOSITES Pub Date : 2025-10-01 DOI: 10.1016/j.jcomc.2025.100669
Khadra Mokadem , Prasad Mattipally , Syed Waheedullah Ghori , Abdullah Alzlfawi , Alok Kumar , Mohammed Al-Bahrani , Mohammed Javeed Siddique , Prakhar Jindal , Rajeshkumar Selvaraj , Dany Tasan Cruz
This work examines the vibration, damping, and instability properties of cylindrical shells comprised of glass fiber-reinforced polymer (GFRP) composite reinforced with carbon nanotubes (CNT). The 2 wt.% CNT-reinforced composites are created using the vacuum-assisted hand layup method. An experimental investigation was done to examine the material characteristics of CNT-reinforced GFRP composites. The results indicate that the CNT reinforced composite exhibits superior material characteristics. A finite element method-based higher-order shear deformation theory (HSDT) is used to obtain the governing equations for the cylindrical shell. Further, a thorough parametric study is conducted to examine the effect CNT reinforcement, curvature ratio, thickness ratio and aspect ratio on the vibration, damping, and instability characteristics of the cylindrical GFRP shell. From the obtained results, it can be concluded that the 2 wt.% CNT reinforcement greatly influences the vibration, damping, and instability characteristics of the cylindrical shells.
本研究考察了由碳纳米管(CNT)增强的玻璃纤维增强聚合物(GFRP)复合材料组成的圆柱壳的振动、阻尼和不稳定特性。2 wt.%碳纳米管增强复合材料是使用真空辅助手铺法创建的。对碳纳米管增强GFRP复合材料的材料特性进行了试验研究。结果表明,碳纳米管增强复合材料具有优异的材料性能。采用基于有限元法的高阶剪切变形理论(HSDT)得到圆柱壳的控制方程。此外,通过参数化研究,考察了碳纳米管配筋、曲率比、厚度比和长径比对圆柱形玻璃钢壳体振动、阻尼和失稳特性的影响。结果表明,2 wt.%碳纳米管对圆柱壳的振动、阻尼和失稳特性有较大影响。
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引用次数: 0
3D printed polyethylene terephthalate glycol ternary composites with short carbon fiber/ carbon nanotube graphitic reinforcements: Insights into multi-scale synergistic mechanisms 具有短碳纤维/碳纳米管石墨增强的3D打印聚对苯二甲酸乙二醇酯三元复合材料:对多尺度协同机制的见解
IF 7 Q2 MATERIALS SCIENCE, COMPOSITES Pub Date : 2025-10-01 DOI: 10.1016/j.jcomc.2025.100684
Fivos Simopoulos , George Kampourakis , George Karalis , Benke Li , Emmanouil Porfyrakis , Stavros Katsiaounis , Aaron Soul , Dimitrios Papageorgiou , Marco Liebscher , Konstantinos Papagelis , Apostolos Karanastasis , Nikolaos Papadakis , Lazaros Tzounis
Three-dimensional printed (3DP) Polyethylene Terephthalate Glycol (PETG) ternary composites reinforced with short carbon fibers (sCF) and multi-walled carbon nanotubes (CNT) are reported for the first time. A single-screw extrusion process is employed to manufacture micro-/nano- ternary PETG-based filaments for Fused Filament Fabrication (FFF)-3DP. Scanning electron microscopy (SEM), thermogravimetric analysis (TGA), Differential Scanning Calorimetry (DSC) and Raman spectroscopy are conducted to characterize the material’s physicochemical properties at filament level. Mechanical and electrical characterizations of 3D-printed PETG composites with hierarchical micro-/nano-filler networks revealed substantial improvements over the neat polymer. Rheological characterization of the composites was conducted in the melt state. The incorporation of CNT significantly altered the melt polymer chain entanglement and the composite spanning network, resulting in changes in molecular entanglement, plateau modulus and yielding behavior, which ultimately affected the 3D printing process and the final composite’s performance. Tensile and flexural tests were performed for unidirectional: (UD[0]16) and cross-ply: (CP[0/90]16s) “16-ply laminate” 3DP specimens, accompanied with fractographic analyses. The highest values in tensile modulus (7.93±0.38 GPa) and strength (53.3 ± 3.49 MPa) are found for PETG loaded with 15.0 wt.% sCF and 2.0 wt.% CNT, hereafter denoted as PETG/sCF(15)/CNT(2), with 285% and 40.5% increase, respectively, compared to neat PETG. The multi-scale PETG/sCF(15)/CNT(2) composite exhibits a 936% improvement in electrical conductivity (σ) compared to PETG/CNT(5) nanocomposite demonstrating the synergy of the co-existing nano-/ micro-fillers’ network within the polymer matrix. The overall results indicate a promising multi-scale reinforced feedstock material with superior mechanical performance and inter-/intralaminar bead adhesion in the 3DP manufactured specimens. The optimized formulations obtained herein could be applied in other polymer matrices towards 3DP multi-functional structural composites with enhanced mechanical and electrical properties.
本文首次报道了以短碳纤维(sCF)和多壁碳纳米管(CNT)为增强材料的三维打印聚对苯二甲酸乙二醇酯(PETG)三元复合材料。采用单螺杆挤压法制备微/纳米聚乙二醇基三元长丝,用于熔丝加工(FFF)- 3d打印。采用扫描电子显微镜(SEM)、热重分析(TGA)、差示扫描量热法(DSC)和拉曼光谱对材料的物理化学性质进行了表征。具有分层微/纳米填充网络的3d打印PETG复合材料的机械和电气特性表明,与纯聚合物相比,该复合材料有了实质性的改进。在熔融状态下对复合材料进行了流变学表征。碳纳米管的加入显著改变了熔融聚合物链缠结和复合材料的跨越网络,导致分子缠结、平台模量和屈服行为的变化,最终影响了3D打印过程和最终复合材料的性能。对单向(UD bbb16)和交叉层压(CP[0/90]16)“16层”3DP试样进行拉伸和弯曲试验,并进行断口分析。PETG的拉伸模量(7.93±0.38 GPa)和强度(53.3±3.49 MPa)在加载15.0 wt.% sCF和2.0 wt.% CNT(以下表示为PETG/sCF(15)/CNT(2)时最高,分别比纯PETG提高了285%和40.5%。与PETG/CNT(5)纳米复合材料相比,多尺度PETG/sCF(15)/CNT(2)复合材料的电导率(σ)提高了936%,证明了聚合物基体内共存的纳米/微填料网络的协同作用。总体结果表明,在3d打印制造的样品中,具有优越的机械性能和层间/层内粘附性的多尺度增强原料是有前途的。本文所获得的优化配方可以应用于其他聚合物基体,从而制备出力学性能和电学性能均有所提高的3d打印多功能结构复合材料。
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引用次数: 0
Viscoelastic high-damping vibration attenuation of sandwich FG-GPLRC face sheets by incorporating full nonlinear effects 考虑全非线性效应的FG-GPLRC夹层面板粘弹性高阻尼减振
IF 7 Q2 MATERIALS SCIENCE, COMPOSITES Pub Date : 2025-09-17 DOI: 10.1016/j.jcomc.2025.100650
Hamidreza Rostami , Sattar Jedari Salami
This article deals with the study of geometrically and materially nonlinear free-damped vibration analysis of Sandwich beams incorporating flexible cores governed by various frequency-dependent viscoelastic models, surrounded with top and bottom face sheets reinforced through a functionally graded distribution of graphene platelets (GPLs) in large deformation. In fact, two types of nonlinearities are considered in the formulation: one arising from the nonlinear strain-displacement relationship, and the other due to the viscoelastic material behavior in the sandwich beam. To analyze the impact of including nonlinear terms in both geometric and material behavior—which has not been reported in the literature—the results are computed by adopting the geometrically nonlinear von Kármán assumptions for the core and the face sheets on one hand, and by employing a viscoelastic core material with complex frequency-dependent Young's/shear modulus that induces material nonlinearity on the other. Based on the Extended Higher-Order Sandwich Panel Theory (EHSAPT), a set of coupled nonlinear governing equations is derived using the Lagrangian technique. As a progressive step, this is the first time that a displacement control technique has been enhanced to simultaneously account for both geometric and material nonlinearities in order to obtain the vibrational characteristics of a system, making it valid for large vibration amplitudes and high damping. To validate the approach, the results obtained from EHSAPT are compared with available data in the literature. Additionally, the problem is also examined by applying Euler–Bernoulli and Timoshenko beam theories to the face sheets and core, respectively. The complex nonlinear eigenvalue problem is solved, and the natural frequencies and loss factors of the viscoelastically damped sandwich beam are calculated. Parametric studies are discussed in detail to investigate the effects of weight fraction, graphene platelet distribution pattern, core-to-face sheet thickness ratio, boundary conditions, viscoelastic core temperature, and vibration amplitude. The results provide valuable and practical insights, showing that considering appropriate ranges of geometry and material in large-amplitude nonlinear vibrations of frequency-dependent viscoelastic core sandwich beams leads to improved design and industrial optimization.
本文研究了包含柔性芯的夹层梁的几何和材料非线性自由阻尼振动分析,这些柔性芯由各种频率相关的粘弹性模型控制,周围是通过大变形的石墨烯片(GPLs)的功能梯度分布加强的顶部和底部面板。实际上,公式中考虑了两种非线性:一种是由非线性应变-位移关系引起的,另一种是由夹层梁中的粘弹性材料行为引起的。为了分析在几何和材料行为中包括非线性项的影响-这在文献中尚未报道-结果是通过采用几何非线性的von Kármán假设来计算一方面的核心和面片,并通过采用具有复杂频率相关的杨氏/剪切模量的粘弹性核心材料来计算材料非线性。基于扩展高阶夹层板理论,利用拉格朗日技术导出了一组耦合非线性控制方程。作为一个进步的步骤,这是位移控制技术第一次得到加强,同时考虑几何非线性和材料非线性,以获得系统的振动特性,使其适用于大振动幅值和高阻尼。为了验证该方法,将EHSAPT获得的结果与文献中的现有数据进行了比较。此外,该问题还通过应用欧拉-伯努利和Timoshenko梁理论分别对面板和核心进行了检验。求解了复合非线性特征值问题,计算了粘弹性阻尼夹层梁的固有频率和损耗因子。详细讨论了参数研究,以研究重量分数、石墨烯血小板分布模式、芯与面片厚度比、边界条件、粘弹性芯温度和振动幅度的影响。结果提供了有价值和实用的见解,表明在频率相关粘弹性芯芯夹层梁的大幅非线性振动中考虑适当的几何形状和材料范围可以改进设计和工业优化。
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引用次数: 0
Structure–property relationships in 3D-printed onyx-based composites reinforced with continuous fibers: role of temperature and fiber orientation 连续纤维增强3d打印玛瑙基复合材料的结构-性能关系:温度和纤维取向的作用
IF 7 Q2 MATERIALS SCIENCE, COMPOSITES Pub Date : 2025-09-15 DOI: 10.1016/j.jcomc.2025.100649
Vishista Kaushik, Suresh Kurra, Ramesh Adusumalli
This study investigates the flexural performance of 3D-printed continuous fiber-reinforced composites, focusing on the influence of fiber types, orientation, and temperature. Using a carbon, glass, kevlar fiber- and Onyx matrix- filaments, specimens were fabricated as 24 or 30-layer composites. Three-point bending tests were conducted under different temperatures. The results reveal a significant influence of fiber type and orientation. Carbon fiber composite showed the highest strength of 281 MPa at 0° orientation and 127 MPa at 90° orientation at RT. At -20 °C, Carbon, Glass and Kevlar composites revealed flexural strength of 422, 308 and 188 MPa respectively (0°). Similarly, with an increase in temperature, a decrement in flexural properties can be observed in all the fiber types. The modulus for kevlar decreased from 8.29 to 5.71 to 4.15 GPa with an increase in temperature from -20 to 27 to 85 °C. Additionally, microscopic analysis highlights the failure mechanisms, including fiber pull-out, delamination, and matrix softening. Grey relation analysis used two mutually conflicted parameters (strength, cost) and reported the best and worst composite amongst 18 combinations considered. The findings provide valuable insights for optimizing the design of 3D-printed composites at different fiber orientations and temperatures enhancing their applicability in structural applications.
本研究研究了3d打印连续纤维增强复合材料的弯曲性能,重点研究了纤维类型、取向和温度的影响。使用碳、玻璃、凯夫拉纤维和缟玛瑙基体长丝,将样品制成24层或30层复合材料。在不同温度下进行三点弯曲试验。结果表明,纤维类型和取向对其有显著影响。碳纤维复合材料在0°取向下的抗弯强度最高,为281 MPa,在90°取向下为127 MPa。在-20℃时,碳纤维、玻璃和凯夫拉复合材料的抗弯强度分别为422、308和188 MPa(0°)。同样,随着温度的升高,在所有类型的纤维中都可以观察到弯曲性能的下降。当温度从-20℃升高到27℃至85℃时,芳纶的模量从8.29 ~ 5.71 ~ 4.15 GPa下降。此外,微观分析强调了破坏机制,包括纤维拔出、分层和基体软化。灰色关联分析使用了两个相互冲突的参数(强度、成本),并在考虑的18种组合中报告了最佳和最差的组合。研究结果为在不同纤维取向和温度下优化3d打印复合材料的设计提供了有价值的见解,增强了其在结构应用中的适用性。
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引用次数: 0
Estimating the creep rupture time of GFRP bars using machine learning 用机器学习估计GFRP筋的蠕变断裂时间
IF 7 Q2 MATERIALS SCIENCE, COMPOSITES Pub Date : 2025-09-15 DOI: 10.1016/j.jcomc.2025.100648
M.Talha Junaid , Ahed Habib , Mazen Shrif , Samer Barakat
Fiber-reinforced polymer (FRP) bars are increasingly utilized in civil structures due to their advantages in terms of corrosion resistance and a high strength-to-weight ratio. Current research on long-term durability, particularly under sustained loading (creep-rupture), has not yet fully explored the use of methods like machine learning to accurately predict the creep rupture time of FRP bars. This study seeks to address this gap by applying machine learning techniques to estimate the creep rupture time of glass fiber-reinforced polymer (GFRP) bars. The motivation for this research comes from the shortcomings of traditional models, which are often inadequate for capturing the complex nonlinear behavior of materials subjected to long-term stress. This research aims to evaluate the effectiveness of different machine learning models, including neural networks, support vector machines, and ensemble methods, in predicting the creep behavior of GFRP bars. Within the study context, a large dataset consisting of 435 experimental tests is collected from the literature. In the testing phase, the optimized neural network achieved an RMSE of 926.29 h and an R² of 0.99 on a heterogeneous dataset that also included bars tested under environmental conditioning reported in the source studies. Gaussian process regression and support vector machines also performed well, albeit with higher errors. Sensitivity analysis revealed that the level of sustained stress and bar diameter were the most critical factors for environmentally conditioned bars. Importantly, the predictors reflect standard design and material descriptors (diameter, fiber content, modulus, UTS, sustained stress) and, when reported, environmental conditioning, which together capture the primary sources of variability relevant to civil engineering practice. Overall, the findings suggest that machine learning, particularly through optimized neural networks, offers a powerful tool for predicting complex material behavior and improving the reliability of GFRP-reinforced structures. This study contributes to the field by highlighting the potential of machine learning to enhance the precision of long-term performance predictions for engineering materials, facilitating improved design and material selection in critical infrastructure.
纤维增强聚合物(FRP)钢筋由于其耐腐蚀和高强度重量比的优点,在民用结构中得到越来越多的应用。目前对FRP筋长期耐久性的研究,特别是在持续荷载(蠕变破裂)下,尚未充分探索使用机器学习等方法来准确预测FRP筋蠕变破裂时间。本研究试图通过应用机器学习技术来估计玻璃纤维增强聚合物(GFRP)棒的蠕变破裂时间来解决这一差距。这项研究的动机来自于传统模型的缺点,这些模型往往不足以捕捉材料在长期应力作用下的复杂非线性行为。本研究旨在评估不同机器学习模型的有效性,包括神经网络、支持向量机和集成方法,以预测GFRP筋的蠕变行为。在研究背景下,从文献中收集了一个由435个实验测试组成的大型数据集。在测试阶段,优化后的神经网络在异构数据集上的RMSE为926.29 h, R²为0.99,该数据集还包括在源研究中报告的环境条件下测试的棒材。高斯过程回归和支持向量机也表现良好,尽管误差较高。敏感性分析表明,持续应力水平和杆径是环境条件杆的最关键因素。重要的是,预测因子反映了标准设计和材料描述符(直径、纤维含量、模量、UTS、持续应力),当报告时,还反映了环境条件,它们一起捕获了与土木工程实践相关的可变性的主要来源。总的来说,研究结果表明,机器学习,特别是通过优化的神经网络,为预测复杂的材料行为和提高gfrp增强结构的可靠性提供了一个强大的工具。这项研究通过强调机器学习的潜力来提高工程材料长期性能预测的准确性,促进关键基础设施的改进设计和材料选择,从而为该领域做出了贡献。
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Composites Part C Open Access
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