Готові списки джерел за темами / CF/PEKK composite

Добірка наукової літератури з теми "CF/PEKK composite"

Автор: Grafiati

Опубліковано: 18 травня 2024

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Статті в журналах з теми "CF/PEKK composite"

Jin, Jianghai, Yuequan Wang, Jiaqi Shi, and Yu Liu. "CF/PEKK advanced pultrusion thermoforming process temperature field simulation." Journal of Physics: Conference Series 2566, no. 1 (August 1, 2023): 012126. http://dx.doi.org/10.1088/1742-6596/2566/1/012126.

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Abstract Advanced pultrusion molding technology is one of the composite molding processes. It has unique advantages in the automated manufacturing of long trusses and long beam components. Thermoplastic composites are becoming popular for research in many fields such as aerospace because of their room-temperature storage and secondary use. Since the temperature history is critical to the molding quality of thermoplastic composites, the temperature field variation of CF/PEKK composites in the advanced pultrusion thermoforming process has been explored in the context of studying the advanced pultrusion molding process of thermoplastic composites in this paper. By constructing a 3D model of the temperature field and setting up a complete solution scheme in ANSYS simulation software, the simulated temperature field data were obtained, and a real-time temperature monitoring platform was set up to obtain the measured temperature data, and the comparison showed that the two temperature profiles fit well, which proved the applicability of the model and solution scheme to this study.

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Modi, Vedant, Aswani Kumar Bandaru, Karthik Ramaswamy, Conor Kelly, Conor McCarthy, Tomas Flanagan, and Ronan O’Higgins. "Repair of Impacted Thermoplastic Composite Laminates Using Induction Welding." Polymers 15, no. 15 (July 29, 2023): 3238. http://dx.doi.org/10.3390/polym15153238.

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The lack of well-developed repair techniques limits the use of thermoplastic composites in commercial aircraft, although trends show increased adoption of composite materials. In this study, high-performance thermoplastic composites, viz., carbon fibre (CF) reinforced Polyetherketoneketone (PEKK) and Polyether ether ketone (PEEK), were subjected to low-velocity impact tests at 20 J. Post-impact, the damaged panels were repaired using an induction welder by applying two different methods: induction welding of a circular patch to the impacted area of the laminate (RT-1); and induction welding of the impacted laminates under the application of heat and pressure (RT-2). The panels were subjected to compression-after-impact and repair (CAI-R), and the results are compared with those from the compression-after-impact (CAI) tests. For CF/PEKK, the RT-1 and RT-2 resulted in a 13% and 7% higher strength, respectively, than the value for CAI. For CF/PEEK, the corresponding values for RT-1 and RT-2 were higher by 13% and 17%, respectively. Further analysis of the damage and repair techniques using ultrasonic C-scans and CAI-R tests indicated that induction welding can be used as a repair technique for industrial applications. The findings of this study are promising for use in aerospace and automotive applications.

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Premanand, Aravind, Mario Prescher, Michael Rienks, Lutz Kirste, and Frank Balle. "Online and Ex Situ Damage Characterization Techniques for Fiber-Reinforced Composites under Ultrasonic Cyclic Three-Point Bending." Polymers 16, no. 6 (March 13, 2024): 803. http://dx.doi.org/10.3390/polym16060803.

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With ultrasonic fatigue testing (UFT), it is possible to investigate the damage initiation and accumulation from the weakest link of the composite material in the very high cycle fatigue (VHCF) regime in a shorter time frame than conventional fatigue testing. However, the thermal influence on the mechanical fatigue of composites and the scatter in fatigue data for composites under ultrasonic cyclic three-point bending loading still need to be investigated. In this study, we conducted interrupted constant-amplitude fatigue experiments on a carbon-fiber satin-fabric reinforced in poly-ether-ketone-ketone (CF-PEKK) composite material. These experiments were carried out using a UFT system, which operates at a cyclic frequency of 20 kHz with a pulse–pause sequence. Various parameters, such as the CF-PEKK specimen’s surface temperature, acoustic activity, and the ultrasonic generator’s input resonance parameters, were measured during cyclic loading. During experiment interruption, stiffness measurement and volumetric damage characterization in the CF-PEKK specimens using 3D X-ray microscopy (XRM) were performed. The locations of damage initiation and accumulation and their influence on the changes in in situ parameters were characterized. Under fixed loading conditions, damage accumulation occurred at different locations, leading to scattering in fatigue life data. Further, the damage population decreased from the surface to the bulk of the composite material.

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Quadrini, Fabrizio, Denise Bellisario, Leandro Iorio, Alice Proietti, and Loredana Santo. "Additive Layer Manufacturing of Carbon Fiber/PEKK Composites for Aeronautic Application." Materials Science Forum 1107 (December 6, 2023): 9–13. http://dx.doi.org/10.4028/p-xa6tlb.

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A 3d printer has been prototyped for additive manufacturing of carbon fiber (CF) poly-ether-ketone-ketone (PEKK) composites. The machine consisted of a SCARA robot, equipped with an extrusion device. The nozzle was designed to allow the deposition of thin unidirectional (UD) tapes without affecting the fiber continuity. An elastic connection between the robot end-effector and the extruder was used for allowing tape agglomeration during manufacturing. Deposition tests were carried out at the extrusion temperature of 400°C and the rate of 130 mm/min, for a maximum number of 3 layers on a CF-epoxy laminate as substrate. The good agglomeration of the 3d printed parts and their adhesion on the composite substrate are shown by the resulted final thickness, and the ability to machine them by end milling. Results show the feasibility of using this technology for the manufacturing of composite shims in the aeronautic sector.

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Cheng, Zhitong, Junwei Qi, Yuequan Wang, and Jianghai Jin. "Optimization of CF/PEKK molding process by orthogonal experiment." Journal of Physics: Conference Series 2566, no. 1 (August 1, 2023): 012123. http://dx.doi.org/10.1088/1742-6596/2566/1/012123.

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Abstract Composite materials have gradually entered people’s attention due to their advantages such as lightweight, high strength, corrosion resistance, fatigue resistance, and strong designability. Widely used in aviation, aerospace, automotive and other fields.[1-4].. The basic mechanical properties of the laminates were evaluated through short beam shear and bending tests. The optimum forming process was determined by orthogonal test: forming temperature 380°C, forming pressure 2 MPa, holding time 60 min, cooling rate 2°C/min. The interlaminar shear strength of this process was 103.42 MPa, and the bending strength was 1570 MPa

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Hou, Meng, and David De Weger. "Optimisation of Manufacturing Conditions of Carbon Fibre Reinforced Polyetherketoneketone (PEKK) Composite." Advanced Materials Research 399-401 (November 2011): 289–93. http://dx.doi.org/10.4028/www.scientific.net/amr.399-401.289.

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The effects of different processing conditions (pressure, holding time and temperature) on the impregnation/consolidation quality of CF/PEKK composite were investigated using compression molding process. Microscopic investigation of cross-sections, density measurements and flexural mechanical properties were used to examine the quality of impregnation and consolidation. A qualitative model to describe the impregnation and consolidation process of this material was developed. The model predicts the variations of void content during consolidation as well as the holding time, moulding temperature and pressure required to reach full consolidation. Good agreement between theoretical predictions and experimental data was achieved. Optimum processing conditions can be determined based on selected void content.

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Premanand, Aravind, Michael Rienks, and Frank Balle. "Damage assessment during ultrasonic fatigue testing of a CF-PEKK composite using self-heating phenomenon." International Journal of Fatigue 180 (March 2024): 108084. http://dx.doi.org/10.1016/j.ijfatigue.2023.108084.

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Kumar, Sumodh, Nidhi Ojha, M. R. Ramesh, A. S. S. Balan, and Mrityunjay Doddamani. "Shape memory behavior of 4D printed CF/PEKK high temperature composite under subsequent thermomechanical cycles." Materials Letters 366 (July 2024): 136567. http://dx.doi.org/10.1016/j.matlet.2024.136567.

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Nachtane, M., M. Tarfaoui, Y. Ledoux, S. Khammassi, E. Leneveu, and J. Pelleter. "Experimental investigation on the dynamic behavior of 3D printed CF-PEKK composite under cyclic uniaxial compression." Composite Structures 247 (September 2020): 112474. http://dx.doi.org/10.1016/j.compstruct.2020.112474.

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Lee, Kyo-Moon, Soo-Jeong Park, Tianyu Yu, Seong-Jae Park, and Yun-Hae Kim. "Experimental prediction of internal defects according to defect area on NDI via water absorption behavior." International Journal of Modern Physics B 35, no. 14n16 (June 30, 2021): 2140021. http://dx.doi.org/10.1142/s021797922140021x.

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This study analyzed the relationship between the defect area identified through a C-scan and the void volume in CF-PEKK composite materials through the water absorption behavior to predict the void volume. The water absorption content varies with the defect area; however, the defect area identified through a C-scan and the water absorption content did not show a proportional relationship. This is because voids are distributed in the through-thickness. The results indicated that the absorption behavior could be used to predict the void volume. Irreversible absorption was found to be independent of the void volume. Further, no matrix degradation was seen with water immersion at [Formula: see text]C; however, some local swelling was seen.

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Дисертації з теми "CF/PEKK composite"

Lesimple, Gwladys. "Interaction du PEKK et des composites PEKK/FC avec l'eau et le Skydrol." Electronic Thesis or Diss., Paris, HESAM, 2023. http://www.theses.fr/2023HESAE016.

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Alléger les avions reste une problématique majeure pour l’industrie aéronautique. Le développement de composites à matrices thermoplastiques, en remplacement des thermodurcissables, permet d’obtenir des matériaux soudables et recyclables, avec une température de service supérieure. Cette thèse s’inscrit dans le cadre du projet PSPC HAICoPAS, porté par Hexcel et Arkema, dont le but est de concevoir des nappes de composites à matrices thermoplastiques hautes performances. L’objectif de cette thèse est d’évaluer l’impact de l’eau et du Skydrol (un fluide hydraulique utilisé en aéronautique) sur les propriétés des composites PEKK/FC (polyéthercétonecétone renforcé en fibres de carbone) et d’identifier les mécanismes responsables des potentielles pertes de propriétés. Pour répondre à cette problématique, l’étude porte à la fois sur la matrice PEKK seule et sur le composite PEKK/FC. Les mécanismes de transport de l’eau dans la matrice ainsi que dans le composite sont mis en évidence par gravimétrie. Les différents paramètres de transport de l’eau sont déterminés dans une gamme de températures de 30°C à 70°C, à la fois en immersion dans l’eau et par DVS pour des humidités relatives entre 10% et 90%. La diffusion de l’eau dans le PEKK seul suit une loi de Fick tandis qu’une déviation de cette loi est observée aux temps long pour le composite PEKK/FC immergé dans l’eau. La solubilité de l’eau dans le PEKK suit une loi d’Henry. Cependant, l’absorption d’eau dans le composite, en fonction de l’humidité relative, est modélisée par une loi d’Henry couplée à une loi de puissance attribuée à un phénomène de « clustering » ayant lieu dans les micro cavités. Les propriétés mécaniques de la matrice et du composite sont peu impactées par l’eau qui induit essentiellement une plastification de la matrice et qui ne semble pas impacter l’interface fibre/matrice. L’immersion de composite PEKK/FC dans le Skydrol révèle une quantité de fluide absorbé par le composite croisé [0/90] dix fois plus importante que pour l’unidirectionnel. Ce résultat est la conséquence de cavités de taille submicronique créées dans le composite [0/90] sous la forme de décohésions à l’interface fibre/matrice. Ces décohésions sont présentes uniquement au niveau des interplis des composites d’empilements croisés (0/90, ±45° ou quasi-isotropes). Leur formation est attribuée au différentiel de retrait thermique qui existe entre les fibres de carbone et la matrice PEKK, causant un champ de contraintes résiduelles post-consolidation, lors du refroidissement. Ces endommagements, très localisés, n’impactent pas les propriétés mécaniques déterminées en ILSS
Lightening aircraft remains a major issue for the aeronautics industry. The development of composites with thermoplastic matrices, replacing thermosetting ones, makes it possible to obtain weldable and recyclable materials, with a higher service temperature. This thesis is part of the PSPC HAICoPAS project, led by Hexcel and Arkema, whose goal is to design high-performance thermoplastic matrix composite tapes. The objective of this thesis is to evaluate the impact of water and Skydrol (a hydraulic fluid used in aeronautics) on the properties of CF/PEKK composites (carbon fiber reinforced polyetherketoneketone) and to identify the mechanisms responsible for potential loss of property. To answer this problem, the study concerns both the PEKK matrix alone and the CF/PEKK composite. The water transport mechanisms in the matrix as well as in the composite are determined by gravimetry. The different water transport parameters are measured in a temperature range of 30°C to 70°C, both in water immersion and by DVS, for relative humidities between 10% and 90%. The diffusion of water in the PEKK alone follows a Fick's law while a deviation from this law is visible at long times for the CF/PEKK composite immersed in water. The solubility of water in PEKK follows Henry's law. However, water absorption in the composite, as a function of relative humidity, is modeled by Henry's law coupled with a power law attributed to a “clustering” phenomenon taking place in the microcavities. The mechanical properties of the matrix and of the composite are little affected by water, which essentially induces plasticization of the matrix and which does not seem to affect the fibre/matrix interface. The immersion of CF/PEKK composite in the Skydrol reveals a quantity of fluid absorbed by the crossed composite [0/90] ten times greater than for the unidirectional layup. This result is the consequence of cavities of submicronic size created in the [0/90] composite in the form of decohesions at the fibre/matrix interface. These decohesions are present only at the level of the interply of the cross-ply composites (0/90, ±45° or quasi-isotropic). Their formation is attributed to the thermal shrinkage differential that exists between the carbon fibers and the PEKK matrix, causing a post-consolidation residual stress field upon cooling. These very localized damages do not affect the resulting mechanical properties in ILSS

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Частини книг з теми "CF/PEKK composite"

Weiß, R. "Influence of Production Parameters on the Mechanical Behaviour of CF/PEEK." In Developments in the Science and Technology of Composite Materials, 1007–12. Dordrecht: Springer Netherlands, 1990. http://dx.doi.org/10.1007/978-94-009-0787-4_145.

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Kempe, G., H. Krauss, and G. Korger-Roth. "Adhesion and Welding of Continuous Carbon-Fiber Reinforced Polyether Etherketone (CF-PEEK/APC2)." In Developments in the Science and Technology of Composite Materials, 105–12. Dordrecht: Springer Netherlands, 1990. http://dx.doi.org/10.1007/978-94-009-0787-4_12.

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Agrawal, Brahma Nand, Pawan Kumar Singh Nain, Saksham Bisht, and Aniket Srivastava. "Prediction of Effective Elastic Properties of PEEK-CF Composites Subjected to Thermomechanical Loading." In Advances in Engineering Materials, 203–9. Singapore: Springer Nature Singapore, 2023. http://dx.doi.org/10.1007/978-981-99-4758-4_19.

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Curtis, D. C., D. R. Moore, B. Slater, and N. Zahlan. "FATIGUE TESTING OF MULTI-ANGLE LAMINATES OF CF/PEEK." In Composites Evaluation, 40–50. Elsevier, 1987. http://dx.doi.org/10.1016/b978-0-408-02569-0.50009-x.

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Ge, Jia, Wei Tan, Giuseppe Catalanotti, Brian G. Falzon, John McClelland, Colm Higgins, Yan Jin, and Dan Sun. "Understanding Chip Formation in Orthogonal Cutting of Aeronautical Thermoplastic CF/PEKK Composites Based on Finite Element Method." In Advances in Transdisciplinary Engineering. IOS Press, 2022. http://dx.doi.org/10.3233/atde220584.

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There has been an enormous increase in using of carbon fiber reinforced thermoplastic (CFRTP) especially carbon fiber reinforce polyetherketoneketone (CF/PEKK) in automotive and aeronautical industries. However, fundamental material removal mechanism of such material has never been elucidated in the literature. In this work, finite-element (FE) method is deployed and microscale numerical model considering fiber, matrix and interface has been established to understand the mechanisms of chip formation in orthogonal cutting of unidirectional (UD) thermoplastic CF/PEKK composites. Chip formation and subsequent surface / subsurface damage with different fiber orientations (0°, 45°, 90°, 135°) are modelled and compared. Results suggest that, for CF/PEKK, the chip formation mechanism is significantly affected by the fiber orientation and the most severe subsurface damage can be seen at fiber orientation 135°, as a result of bending fracture below the ideal machined surface.

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Friedrich, K., J. Flöck, K. Varadi, and Z. Néder. "Real contact area, contact temperature rise and transfer film formation between original and worn surfaces of CF/PEEK composites sliding against steel." In Tribology Series, 241–52. Elsevier, 1999. http://dx.doi.org/10.1016/s0167-8922(99)80046-7.

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Тези доповідей конференцій з теми "CF/PEKK composite"

POLNIKORN, Purith. "Basic characterization of the CF-PEKK prepreg and laminates for low temperature applications." In Material Forming. Materials Research Forum LLC, 2024. http://dx.doi.org/10.21741/9781644903131-45.

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Abstract. This paper investigates a carbon fibre-reinforced polyetherketoneketone (CF-PEKK) thermoplastic composite used for low-temperature applications like hydrogen tank applications. The degree of crystallinity of the prepreg as received first and then consolidated after hot press has been investigated. The melting temperature and glass transition, as well as the melting enthalpy and degree of crystallinity, were also studied by DSC (differential scanning calorimetry). The fibre volume fraction and void content after consolidation have been measured by acid digestion and an optical microscopy image analysis. Thermomechanical analysis (TMA) was also used in order the coefficients of thermal expansion (CTE) to be determined. Tensile and compressive Dynamic Mechanical Analysis (DMA)test were performed. Storage modulus, loss modulus, and Tan δ relationship have thus been analysed. Multifrequency DMA experiments have been conducted in order to create the master curve thanks to the time-temperature superposition (TTS).

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LE LOUËT, V. "Experimental measurement of CF/PEKK tapes heating behavior in the laser assisted automated fiber placement process." In Material Forming. Materials Research Forum LLC, 2023. http://dx.doi.org/10.21741/9781644902479-205.

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Abstract. This work takes place within the framework of the study and control of heat transfer taking place during the heating stage of the Laser Assisted Automated Fiber Placement (AFP) process. Understanding the interaction between the composite tape and the incoming laser radiation is a cornerstone for controlling the thermal history of the laminate. Laser incidence, fibre orientation and lay-up velocity have long been identified as key factors influencing the laser absorption by the composite and its increase in temperature. For the sake of simplicity, homogenous model is often used to describe phenomena inside the composite. However, the study of the radiative behaviour of laminates and tapes has shown that absorption occurs over a volume whose size depends on the carbon fibre architecture within the polymer matrix. Investigating heat transfer at micro scale is then crucial to fully understand the thermal phenomena occurring in the AFP process. In order to investigate heat transfer according to process parameters and especially to the orientation of the tape, a specific bench is developed in order to perform static heating a single composite with a laser diode. A full calibration of the bench was first performed including the response of the IR camera as well as the shape and power imposed by the laser source. Then, measurements for several orientations of the tape (0°,45° and 90°) were performed and thermal response measured and analysed.

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MARTINEZ, JIMENA, TIMOTHY YAP, and MEHRAN TEHRANI. "EFFECTS OF EXTRUSION RATE AND POST-ANNEALING ON MECHANICAL PROPERTIES AND PRINTING QUALITY OF ADDITIVELY MANUFACTURED CARBON FIBER REINFORCED POLYETHERKETONEKETONE (PEEK) PARTS." In Proceedings for the American Society for Composites-Thirty Seventh Technical Conference. Destech Publications, Inc., 2022. http://dx.doi.org/10.12783/asc37/36423.

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The development of high-temperature fused filament fabrication (FFF) 3D printers has enabled the additive manufacturing (AM) of polymers and composites with relatively high thermomechanical properties. Among them is polyetherketoneketone (PEKK) reinforced with short carbon fibers (CF-PEKK). PEKK is a high-performance thermoplastic that belongs to the polyaryletherketone (PAEK) polymer family with excellent mechanical properties. In particular, it offers a glass transition temperature of ~140°C, a relatively high modulus that can be readily enhanced by carbon fiber addition, and specific strength comparable to aluminum alloys. Therefore, there is a growing interest in using CF-PEKK to replace metal parts. Low dimensional accuracy and resolution, high porosity, and poor inter-layer strength [1-3] have limited FFF parts to rapid prototyping and non-structural applications. This paper aims to investigate extrusion rate, a printing parameter, and post-annealing as a potential solution to reducing porosity and enhancing inter-layer strength in CF-PEKK printed parts. A 5% increase in the theoretical extrusion multiplier (EM) resulted in a 1.6% reduction of void content accompanied by a 30% improvement in the inter-layer tensile strength of CFPEKK coupons. The impacts of extrusion rate and post-annealing (in a salt-packed container) on the printing quality of CF-PEKK parts are also determined. No significant structural or dimensional changes were detected with the higher extrusion rate or annealing in salt. This paper provides a new understanding of mechanical properties, processing, printability of CF-PEKK, and their AM challenges.

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YOUNG, DEVIN, BRITANNIA VONDRASEK, and MICHAEL CZABAJ. "INVESTIGATION OF MECHANICAL PROPERTIES OF COMPOSITES-BASED SHEET LAMINATION ADDITIVE MANUFACTURING PROCESS." In Proceedings for the American Society for Composites-Thirty Seventh Technical Conference. Destech Publications, Inc., 2022. http://dx.doi.org/10.12783/asc37/36463.

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The Composites-Based Additive Manufacturing (CBAM) system is a novel sheet lamination process combining mats of randomly oriented carbon fiber (CF) reinforcement with thermoplastic matrix materials to fabricate composite objects. This study investigated the suitability of three ASTM test standards for tensile, inplane shear, and interlaminar fracture properties of two CBAM material systems: CF reinforced Nylon-12 (CF/PA12) and CF reinforced polyether ether ketone (CF/PEEK). The tensile, in-plane shear, and interlaminar fracture tests were well suited for the CF/PEEK material, though high variability was found in the interlaminar fracture response. The CF/PA12 material system exhibited high plasticity and evidence of a poor fiber-matrix interface. This was shown by fiber pullout in the tensile tests and the presence of voids observed on the in-plane shear surfaces. The interlaminar fracture test method was invalid for the CF/PA12 material due to a large process zone invalidating. These results show CF/PEEK to be a promising material system for the CBAM process while CF/PA12 requires further development.

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CARASSUS, F. "Influence of roughness in ultrasonic welding of carbon fiber/PEEK composites." In Material Forming. Materials Research Forum LLC, 2023. http://dx.doi.org/10.21741/9781644902479-199.

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Abstract. In this work on ultrasonic welding of CF/PEEK composites, it was established that the surface roughness of the substrates has an influence on the interfacial strength of a joint. The joint resistance is lower when the roughness increases. Interestingly, a new characteristic time was found, named the healing plateau time (tHP), which is determined by the displacement versus time curves during ultrasonic welding. This time seems to be related to the shear strength of the joint. This is a major finding, because it appears as a non-destructive way of predicting the quality of welds. Besides, DNS test on CF/PEEK unidirectional composite pointed out 40% higher shear strength compared with SLS, performed on CF/PEEK substrates assembled with a 250 µm PEI integrated energy director. Ultrasonic welding was optimized to reach a performance close to the shear strength of bulk.

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Yang, Jing, Weiguo Su, and Dong Wang. "Study on PEEK/CF Composite Finite Element Model." In 2023 26th International Conference on Electrical Machines and Systems (ICEMS). IEEE, 2023. http://dx.doi.org/10.1109/icems59686.2023.10344598.

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Yavas, Denizhan, and Luis Sosa. "Investigating the Interlaminar Shear Strength of Short Carbon Fiber-Reinforced PEEK Composites Fabricated by Fused Filament Fabrication." In ASME 2023 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2023. http://dx.doi.org/10.1115/imece2023-114936.

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Abstract Carbon fiber (CF)-reinforced polyetheretherketone (PEEK) composites are highly valued for their exceptional physical and mechanical properties, making them suitable for various industrial applications. This study aims to investigate the interlaminar shear strength (ILSS) of short CF-reinforced PEEK composites fabricated by the fused filament fabrication (FFF) technique. Short beam shear (SBS) tests were performed to quantify the ILSS of 3D-printed CF-reinforced PEEK composites and unreinforced PEEK as the baseline. The digital image correlation (DIC) technique was used during the tests to measure in-situ full-field strain maps, enabling the observation of interlaminar failure mechanisms. The role of CF reinforcement and infill line orientation between adjacent layers on the ILSS of the PEEK composites was analyzed. The research findings reveal two main points: firstly, by adding short carbon fibers to 3D-printed PEEK composites, known as CF-PEEK, their ILSS can be improved by up to 100%, making it more effective than standard PEEK. Secondly, increasing the mismatch angle θ between infill lines of neighboring layers enhances ILSS in both PEEK and CF-PEEK by up to 50%. These outcomes could enhance the mechanical properties of 3D-printed PEEK and CF-PEEK composites in industries that require strong, lightweight materials.

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Panin, S. V., V. O. Alexenko, D. Tian, D. G. Buslovich, and A. V. Byakov. "Ultrasonic welding of “PEEK–CF–fabric prepreg–PEEK” laminated composites." In PHYSICAL MESOMECHANICS OF CONDENSED MATTER: Physical Principles of Multiscale Structure Formation and the Mechanisms of Nonlinear Behavior: MESO2022. AIP Publishing, 2023. http://dx.doi.org/10.1063/5.0162779.

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Byakov, A. V., V. O. Alexenko, and S. V. Panin. "Ultrasonic welding assisted formation of PEEK-CF layered composites." In PROCEEDINGS OF THE INTERNATIONAL CONFERENCE “PHYSICAL MESOMECHANICS. MATERIALS WITH MULTILEVEL HIERARCHICAL STRUCTURE AND INTELLIGENT MANUFACTURING TECHNOLOGY”. AIP Publishing, 2022. http://dx.doi.org/10.1063/5.0084750.

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KORYCKI, Adrian. "Monitoring the temperature during thermoplastic composites assembling with fibre Bragg gratings: Validation using a rheometer." In Material Forming. Materials Research Forum LLC, 2024. http://dx.doi.org/10.21741/9781644903131-293.

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Анотація:

Abstract. For many years, thermoplastic composites have been conquering the technological market in commercial applications in civil and military structures, with particular emphasis on aircraft. One of their most attractive advantages is the potential to be repaired and welded in a short time. However, due to the lack of knowledge on the impact of process parameters (time, pressure, temperature) bonding thermoplastic composites remains a challenge. The combined action of force and temperature leads to intimate contact between the substrates, which is the prerequisite for macromolecular interdiffusion and welding. A polymer film named Energy Director (ED) can be set up at the interface between substrates to enable the process and to ensure the strength of the joint. This leads to the need for a temperature measurement technique to better understand the physics responsible for the best bonding parameters. The use of Fibre Bragg Grating (FBG) seems to be suitable for obtaining real-time temperature data during the joining. The present work is challenging this technique by means of a rheometer as a device for results validation. The considered bonded materials are carbon fibre-reinforced polyetheretherketone (CF/PEEK) and polyetherimide (PEI). The integration of PEI film on top of the CF/PEEK composite parts is studied. The FBG sensors respond to both temperature and longitudinal strain. Then two kinds of measurements are examined under the rheometer: the first response of the fibre as a function of temperature in static mode during processing and the second one as a function of torque loading. Wavelength shifts and spectral form changes induced by the contraction of the composite during cooling were observed. The use of a rheometer is suitable for the simulation of CF/PEEK composites joining processes such as welding. FBG method has a higher potential for temperature measurement than incorporated thermocouples (TC) as studied during ultrasonic (US) welding [1]. Its advantage is the possibility to allow several measurement points along the optical fibre. The ultimate goal is to provide temperature mapping in the welding zone. The results from both techniques: optical fibre sensors and thermocouples were compared.

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