Academic literature on the topic 'Composite laminate in Carbon Fiber Reinforced Polymer (CFRP))'
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Journal articles on the topic "Composite laminate in Carbon Fiber Reinforced Polymer (CFRP))":
1
Subagia, I. D. G. Ary, and Yonjig Kim. "Tensile behavior of hybrid epoxy composite laminate containing carbon and basalt fibers." Science and Engineering of Composite Materials 21, no. 2 (March 1, 2014): 211–17. http://dx.doi.org/10.1515/secm-2013-0003.
Abstract:
AbstractThis paper investigated the effect of the incorporation of basalt fibers on the tensile properties of carbon fiber-reinforced epoxy laminates manufactured by vacuum-assisted resin transfer molding. The purpose of this research was to design a carbon-basalt/epoxy hybrid composite material that is of low cost in production, is lightweight, and has good strength and stiffness. The tensile strength and stiffness of the hybrid laminates demonstrated a steady, linear decrease with an increase in basalt fiber content, but the fracture strain gradually increased together with the increase in the basalt layer content. In this study, the incorporation of basalt fibers into the carbon fiber-reinforced polymer (CFRP) showed lower tensile strength than CFRP but has higher tensile strain. Furthermore, we found that the arrangement and enhancement of basalt fiber into the CFRP significantly influence the mechanical properties of interply hybrid composites.
2
Khan, Mohammad K. A., Harri Junaedi, Hassan Alshahrani, Ahmed Wagih, Gilles Lubineau, and Tamer A. Sebaey. "Enhanced Open-Hole Strength and Toughness of Sandwich Carbon-Kevlar Woven Composite Laminates." Polymers 15, no. 10 (May 11, 2023): 2276. http://dx.doi.org/10.3390/polym15102276.
Abstract:
Fiber-reinforced plastic composites are sensitive to holes, as they cut the main load-carrying member in the composite (fibers) and they induce out-of-plane stresses. In this study, we demonstrated notch sensitivity enhancement in a hybrid carbon/epoxy (CFRP) composite with a Kevlar core sandwich compared to monotonic CFRP and Kevlar composites. Open-hole tensile samples were cut using waterjet cutting at different width to diameter ratios and tested under tensile loading. We performed an open-hole tension (OHT) test to characterize the notch sensitivity of the composites via the comparison of the open-hole tensile strength and strain as well as the damage propagation (as monitored via CT scan). The results showed that hybrid laminate has lower notch sensitivity than CFRP and KFRP laminates because the strength reduction rate with hole size was lower. Moreover, this laminate showed no reduction in the failure strain by increasing the hole size up to 12 mm. At w/d = 6, the lowest drop in strength showed by the hybrid laminate was 65.4%, followed by the CFRP and KFRP laminates with 63.5% and 56.1%, respectively. For the specific strength, the hybrid laminate showed a 7% and 9% higher value as compared with CFRP and KFRP laminates, respectively. The enhancement in notch sensitivity was due to its progressive damage mode, which was initiated via delamination at the Kevlar–carbon interface, followed by matrix cracking and fiber breakage in the core layers. Finally, matrix cracking and fiber breakage occurred in the CFRP face sheet layers. The specific strength (normalized strength and strain to density) and strain were larger for the hybrid than the CFRP and KFRP laminates due to the lower density of Kevlar fibers and the progressive damage modes which delayed the final failure of the hybrid composite.
3
Ismail*, Mohd Fadzli, and Aidah Jumahat. "Impact Properties of Hybrid Fibre Reinforced Polymer Composite Laminates." International Journal of Innovative Technology and Exploring Engineering 9, no. 3 (January 30, 2020): 2763–66. http://dx.doi.org/10.35940/ijitee.c9206.019320.
Abstract:
The increasing demand for high-strength light-weight fibre reinforced polymer (FRP) composite materials has driven the researchers to further innovate and introduce hybrid reinforcement materials. The usage of hybrid FRP composite laminates in structural industries is still new and limited research has been reported in this area. Thus, this research is aimed to determine the impact properties of hybrid FRP composite laminate. The impact tests were carried out on three types of FRP composite laminates, i.e. Carbon, Glass and Hybrid, in order to determine the impact properties of the materials. The composite laminates were prepared using hot pressing method. It was found that the hybrid FRP composite laminate exhibited better impact properties with 13% higher specific energy absorption when compared to the neat carbon FRP composite laminate. The impact test on hybrid FRP composite laminate recorded higher peak force, deflection at peak force and energy absorbed values of 109%, 71% and 25% respectively, when compared to the neat CFRP composite laminate.
4
Sun, Jinru, Xuanjiannan Li, Xiangyu Tian, Jingliang Chen, and Xueling Yao. "Dynamic electrical characteristics of carbon fiber-reinforced polymer composite under low intensity lightning current impulse." Advanced Composites Letters 29 (January 1, 2020): 2633366X2094277. http://dx.doi.org/10.1177/2633366x20942775.
Abstract:
The distribution and conduction path of lightning current inside carbon fiber-reinforced polymer (CFRP) composites subjected to lightning strikes are determined by their dynamic conductive characteristics. An experimental platform that generates lightning current impulses with variable parameters was established to obtain the equivalent conductivities of CFRPs with different laminated structures. The experimental results indicated that the through-thickness conductivity (10−3 S/mm) was much lower than the in-plane conductivity (100 S/mm). Then, the dynamic conduction model of CFRPs was analyzed based on the anisotropic nonlinear conductivities of CFRPs under lightning currents of 50–1000 A. The CFRP laminate could be regarded as a series circuit of resistance and inductance. The dynamic conductance of the CFRP laminate first increased and then decreased during the single lightning current strike process, which was closely related to the conductive properties of the interlaminar resin. The inductive properties of the CFRP material were manifested in the test results, which showed that the voltage reached the peak value prior to the current waveform and the equivalent conductivities of the CFRPs increased as the rate of increase decreased and the duration increased. In addition, the equivalent inductance of the carbon fiber network was found to be an important part of the inductive effect of CFRP laminates. This research is helpful for understanding the complicated relationships in the lightning current conducting process and can provide experimental and theoretical support for CFRP coupled electrical–thermal simulation studies of lightning direct effects.
5
Liu, J. A., Z. Q. Dong, X. Y. Zhu, W. B. Sun, and Z. Q. Huang. "Flexural properties of lightweight carbon fiber/epoxy resin composite sandwiches with different fiber directions." Materials Research Express 9, no. 2 (February 1, 2022): 026506. http://dx.doi.org/10.1088/2053-1591/ac4dc5.
Abstract:
Abstract In this study, structurally efficient carbon fiber reinforced plastic (CFRP) sandwiches were developed via introducing pumice/Mg composite foams as new core material. The effects of the fiber direction (0°, 45°, 90°) on the mechanical properties of CFRP laminates and composite sandwiches were studied. Compared with 45°-CFRP and 90°-CFRP laminates, 0°-CFRP laminate exhibits outstanding flexural properties due to different failure modes. Correspondingly, the 0°-CFRP/PMSF composite sandwiches exhibit higher flexural strength than 45°-CFRP/PMSF and 90°-CFRP/PMSF composite sandwiches. The as-prepared composite sandwiches are lightweight and have higher specific strength than some traditional sandwiches. The different flexural behaviors of three types of sandwiches were observed to explain the failure mechanisms.
6
CASAPU, Maria, Michel ARRIGONI, and Ion FUIOREA FUIOREA. "Off-axis response and shear characterization of unidirectional ply-level hybrid carbon-fiber-reinforced polymer materials." INCAS BULLETIN 15, no. 3 (September 4, 2023): 31–46. http://dx.doi.org/10.13111/2066-8201.2023.15.3.3.
Abstract:
Composite materials, among them Carbon Fiber Reinforced Polymers (CFRP), have become a key material in structural applications for lightweight structures such as spacecraft and aircraft. CFRP can be found under various quality grades and their mechanical performances increase with their cost and quality grade. In order to limit the costs of the material without degrading technical performances, hybridization could be of interest. However, assessing the conservation of quality standards of hybridized CFRP is crucial. This paper investigates the off-axis mechanical response of ply-level hybrid carbon composites, with varying thickness and material quality. Two types of carbon fiber prepregs were combined in the same laminate using symmetric and asymmetric stacking sequences. Monotonic quasi-static off-axis tests were performed to evaluate the non-linear stress-strain behavior of the laminates, with Digital Image Correlation used to measure strain. The apparent elastic modulus and the in-plane shear modulus were evaluated from the tensile tests at three off-axis angles. The results indicate that the hybrid laminates exhibit higher failure stress levels compared to simple laminates, with an intermediate failure strain. Overall, this study provides insights into the off-axis mechanical behavior of ply-level hybrid carbon fiber composites, with potential applications in the design of composite structures.
7
Hu, Junfeng, Xutong Zhang, Zhou Chen, Wenkang Guo, Hang Li, and Xi Deng. "Experimental and Numerical Research on Open-Hole Strength and Damage Mechanism of Regularly Arrayed Short Fiber Reinforced Polymer Composite." Polymers 12, no. 7 (July 21, 2020): 1622. http://dx.doi.org/10.3390/polym12071622.
Abstract:
Laminates with unidirectionally arrayed chopped strands (UACS) are one of the advanced short fiber reinforced polymer composites (SFRP) with significant application prospect, which greatly improves mechanical properties compared to the traditional SFRP, meanwhile ensuring excellent flowability. In practice, composite laminate with an open hole is one of the typical connective components, and it is necessary to clarify the allowable load and damage tolerance performance of notched structures. In the present study, UACS laminates were fabricated using the continuous carbon fiber reinforced polymer (CFRP) prepreg, on which regularly arrayed bi-angled slits were introduced by a commercial numerical control cutter. The tensile strength and strain distribution around the open hole of the notched UACS laminate were experimentally investigated, while the damage progression near the open hole of the notched UACS laminate was analyzed by the finite element method (FEM). The tensile strength of the notched UACS laminate was measured at 298 MPa, which is about 60% of the strength of the unnotched UACS laminate. The simulation results match well with the experimental results, although there is a little overestimate on strength, by about 5% and 7%, for unnotched and notched UACS laminates, respectively. The final critical failure mode for the notched UACS laminate is mainly dominated by the delamination instead of the fiber breakage in the unnotched UACS laminate.
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Yousuf, Aquib Bin, Sajjid Hasan Asif, Md Jalal Uddin Rumi, and Kamrul Hasan. "Progressive Failure Analysis of Carbon Fiber Reinforced Polymer Composite with a Circular Notch by Varying Fiber Orientation." IOP Conference Series: Materials Science and Engineering 1305, no. 1 (April 1, 2024): 012019. http://dx.doi.org/10.1088/1757-899x/1305/1/012019.
Abstract:
Abstract Progressive failure for Carbon Fiber Reinforced Polymer (CFRP) was computationally studied and analyzed using Hashin’s failure criteria. It was an interactive failure criterion having 4 separate modes of failure. 8 layers of plies were oriented at specific stacking sequences to create different laminates with dimensions being specified using the ASTM D5766 standard. A total of 7 types of laminate were modeled and simulated to predict the failure for each type under tensile loading. A circular notch was added in the center for the concentration of stress. The damage to the fiber and matrix propagated and failed the structure. Contour plot analyses showed failure progression of fibers and matrix around the circular notch. Results show that matrix failure most predominant and critical type of failure for most laminates. From the stress vs. strain curves, it was seen that the [0/90]4 cross-ply laminate showed the highest open-hole tensile strength.
9
Manomaisantiphap, Siwat, Vipin Kumar, Takao Okada, and Tomohiro Yokozeki. "Electrically conductive carbon fiber layers as lightning strike protection for non-conductive epoxy-based CFRP substrate." Journal of Composite Materials 54, no. 29 (June 24, 2020): 4547–55. http://dx.doi.org/10.1177/0021998320935946.
Abstract:
A large amount of electrically conductive fillers is needed to enhance a Carbon Fiber Reinforced Plastics (CFRP) electrical conductivity enough to withstand lightning strikes of peak currents. However, such large alien constituents hamper the inherent good mechanical properties of CFRP structures. In this work, a solution has been proposed to retain both desired properties in a CFRP laminate. Layer-wise hybrid laminate has been demonstrated as a solution for lightning strike protection of Carbon Fiber Reinforced Plastics (CFRP). Top few layers of a hybrid laminate are prepared using electrically conductive polymer-based resin (CF/C-POLY) to provide effective dissipation of lightning current while epoxy-based CFRP substrate (CF/Epoxy) provides the main structural strength. An insulating adhesive layer is used to bond CF/C-POLY and CF/Epoxy to prepare the laminate. The hybrid laminates were tested for their effectiveness against lightning strikes. Laminates were struck by modified lightning waveform of component A with peak current of -14 kA and -40 kA. The performance of the laminates against lightning strike were evaluated using high speed camera, high-speed and thermal camera. It is found that CF/C-POLY layer successfully defended the main structural component i.e. CF/Epoxy from lightning direct damage.
10
Zhong, Yu Cheng, and Sunil Chandrakant Joshi. "Diffusion Characteristics of Moisture in Polymer Composites under Different Hygrothermal Conditions." Advanced Materials Research 849 (November 2013): 69–74. http://dx.doi.org/10.4028/www.scientific.net/amr.849.69.
Abstract:
The diffusion of moisture in composite materials is a complex phenomenon. In this investigation, effects of temperature, laminate architecture and cyclic hygrothermal conditions on the moisture absorption behavior of carbon/epoxy laminates were explored. Both woven and unidirectional laminates were fabricated from carbon fiber reinforced epoxy prepreg materials (CFRP). Specimens were later immersed in water at different temperatures, including room temperature (RT), 60°C and 80°C, or exposed to cyclic hydrothermal conditions. Within the temperature range studied, the diffusion of moisture inside the CFRP laminates followed the Ficks law. Both the diffusivity and the saturation moisture contents of the conditioned laminates increased with temperature. Furthermore, no weight variation was observed when the specimens were stored in a freezer at-30°C. The architecture of the reinforcement fibers also exhibited significant influence on the diffusion behavior of moisture in the laminates. Under the same temperature, the diffusivity of moisture in woven laminates was higher than that in unidirectional laminates.
Dissertations / Theses on the topic "Composite laminate in Carbon Fiber Reinforced Polymer (CFRP))":
1
Pandolfi, Carlo. "Experimental characterization of carbon-fiber-reinforced polymer laminates." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2016. http://amslaurea.unibo.it/9777/.
Abstract:
The goal of this thesis is to make static tensile test on four Carbon Fiber Reinforced Polymer laminates, in such a way as to obtain the ultimate tensile strength of these laminates; in particular, the laminates analyzed were produced by Hand Lay-up technology. Testing these laminates we have a reference point on which to compare other laminates and in particular CFRP laminate produced by RTM technology.
2
Lee, Tuan Kuan 1976. "Shear strength of reinforced concrete T-beams strengthened using carbon fibre reinforced polymer (CFRP) laminates." Monash University, Dept. of Civil Engineering, 2003. http://arrow.monash.edu.au/hdl/1959.1/6647.
3
Angelidis, Nikolaos. "Damage sensing in CFRP composites using electrical potential techniques." Thesis, Cranfield University, 2004. http://dspace.lib.cranfield.ac.uk/handle/1826/127.
Abstract:
This Thesis investigates the damage sensing capabilities of the electrical potential measurement technique in carbon fibre reinforced polymer composites. Impact damage was introduced in multidirectional laminates and its effect on potential distribution studied. It was found that delaminations and fibre breakages within the laminate can be detected and located by measuring potential changes on the external composite surface. The extent and size of potential changes were significantly affected by the position of the current electrodes in relation to the potential measurement probes. A numerical model was developed investigating the effect of different size delaminations, located in various positions within the lamina, on electrical potential distributions on the external ply, and a quantitative analysis of the numerical results is presented. The numerical simulations demonstrated that the measured potential changes on the external ply were in proportion to the delamination size. The numerical and experimental results were compared and the optimum configuration of current electrodes and potential probes for damage detection selected. The response of electrical potential to mechanical strain, in unidirectional and multidirectional samples was also investigated. It was found that the conductive medium, used for introducing the current, defines the piezo-resistance performance of the composite. A finite element model was developed able to predict the effect of inhomogeneous current introduction in unidirectional specimens on electrical potential and piezo-resistance. The effects of temperature and water absorption on potential measurements were also presented.
4
Deng, Jiangang. "Durability of carbon fiber reinforced polymer (CFRP) repair/strengthening concrete beams." Laramie, Wyo. : University of Wyoming, 2008. http://proquest.umi.com/pqdweb?did=1663060011&sid=2&Fmt=2&clientId=18949&RQT=309&VName=PQD.
5
Curnutt, Austin. "Research on the mechanics of CFRP composite lap joints." Thesis, Kansas State University, 2017. http://hdl.handle.net/2097/38191.
Abstract:
Master of ScienceDepartment of Architectural Engineering
Donald J. Phillippi
For this thesis, research was performed on CFRP bonded composite lap-joints with one and two continuous laminas through the lap. Composite wraps used to retrofit existing structures use lap joints to maintain their integrity. The use of composites for retrofitting structures has many advantages over traditional methods, such as steel jacketing, and is becoming more widely accepted in the structural engineering industry. While much literature exists documenting the performance of composite wraps as a whole when applied to concrete columns, less information is available on the behavior of the lap-joint of the wrap. Developing a better understanding of how the lap-joint behaves will help researchers further understand composite column wraps. This research sought to determine what affect continuous middle laminas may have on the stiffness of lap joints and whether or not stress concentrations exist in the lap-joint due to a change in stiffness.
6
Kergosien, Nina. "Instrumentation de plaque composite de type aéronautique pour le contrôle santé intégré." Electronic Thesis or Diss., Ecully, Ecole centrale de Lyon, 2024. http://www.theses.fr/2024ECDL0008.
Abstract:
Des systèmes CSI sont actuellement à l'étude pour vérifier l'intégrité des matériaux composites des aéronefs. Ils permettent d’optimiser la maintenance, en donnant la possibilité de suivre l’état des structures en temps réel ou de contrôler ponctuellement des pièces difficiles d’accès par les méthodes de CND courantes. Les matériaux composites offrent la possibilité d’intégrer un système CSI directement à cœur du matériau. De cette façon, l’instrumentation est protégée de l’environnement et les problématiques de collage en surface sont résolues. L'objectif de cette thèse est de déterminer les effets de l'intégration de transducteurs ultrasonores piézoélectriques à cœur d'un composite PRFC stratifié de type aéronautique sur leur comportement en émission et en réception afin de montrer les avantages et inconvénients d'une telle intégration à cœur pour le monitoring de ces structures par ondes de Lamb. Les transducteurs PZT minces se sont révélés être les transducteurs les plus adaptés à l'intégration, car ils supportent les conditions d'élaboration d'un composite de structures aéronautiques élaboré en autoclave (7 bar et 180°C) et sont capables d'émettre et de recevoir des ondes guidées se propageant dans les plaques. La méthode d'intégration a été adaptée pour préserver l'intégrité des PZT et optimiser leur capacité d'émission d'ondes dans un composite. A cette occasion, la capacité des mesures d'impédance électromécanique à vérifier rapidement l'efficacité de la mise en œuvre de l'intégration a été validée. La caractérisation du champ d'onde qA0 a été réalisée expérimentalement, grâce aux déplacements hors plan mesurées avec un vibromètre laser suite à l'excitation de disques PZT intégrés à des fréquences comprises entre 30 et 200 kHzLa capacité du PZT intégré à détecter un défaut simulé de type aimant est aussi étudiée en essai d'émission-réception et est comparé avec le comportement de PZT couplés en surface de composite. Une étude par modélisation fréquentielle multiphysique a ensuite été réalisée afin de mettre en évidence les phénomènes physiques mis en jeu par l'intégration d'un PZT à cœur de composite. Ainsi, la direction des plis en contact du PZT intégré, la profondeur d'intégration et le couplage du PZT au composite influent sur le mécanisme de transduction ultrasonore. De plus, les contraintes induites par l'actionneur PZT ne permettent pas d'être simplifiées sous forme d'un modèle de type pin-force habituellement utilisé comme chargement d'un PZT en surface de matériau isotrope. En effet, les contraintes induites localement par l'excitation du PZT intégré ne sont pas radiales et dépendent de l'électrode du PZT considérée ainsi que des fréquences de génération d'ondesSHM systems are currently being developed to check the integrity of aircraft composite materials. These systems will help optimize maintenance by enabling real-time monitoring of structural condition, or spot-checking of parts that are difficult to access using conventional NDT methods. Composite materials offer the possibility of integrating a SHM system directly into the material. In this way, the instrumentation is protected from the environment and surface bonding issues are resolved. The aim of this thesis is to determine the effects of integrating piezoelectric transducers into the core of an aeronautical laminated CFRP composite on their Lamb-wave emission and reception abilities, in order to demonstrate the advantages and disadvantages for the design of a defect detection SHM system. Thin PZT transducers proved to be the most suitable ones for integration, as they can withstand the processing conditions of an autoclave-processed composite (7 bar and 180°C). They are also capable of transmitting and receiving guided waves, which are propagating in the plates. Moreover, the integration method was adapted to preserve the integrity of the PZTs and to optimize their ability to transmit waves in a composite. In order to assess the effectiveness of the integration, electromechanical impedance measurements were made a fast checking process. Characterization of qA0 mode wavefield transmitted by embedded PZT was carried out experimentally. Surface-bonded and embedded PZT were excited at frequencies between 30 and 200 kHz, while out-of-plane displacements were measured with a laser vibrometer. The ability of the embedded PZT to detect a simulated magnet-type defect are also studied in pitch-catch tests, and compared with the behavior of surface-bonded PZT to the composite surface. A dynamic finite element modelling study was then conducted to highlight the physical phenomena induced by the integration of a PZT in the composite core. The direction of the plies in contact with the embedded PZT, the depth of integration and the coupling of the PZT with the composite are influencing the ultrasonic transduction mechanism. Furthermore, it appears that the stresses induced by the PZT actuator cannot be simplified by the pin-force model usually used to load a PZT on an isotropic material surface in flaw detection models. These stresses are not radially oriented and depend on the PZT electrode considered, as well as on the wave generation frequencies
7
Olka, Michael. "FLEXURAL MECHANICAL DURABILITY OF CONCRETE BEAMS STRENGTHENED BY EXTERNALLY BONDED CARBON FIBER REINFORCED POLYMER SHEETS." Master's thesis, University of Central Florida, 2009. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/3120.
Abstract:
About 77,600 bridges throughout the United States in the Federal Highway Association (FHWA) bridge database are listed as structurally deficient. This has created a need to either replace or strengthen bridges quickly and efficiently. Due to high costs for total replacement of deficient bridges, strengthening of existing bridges is a more economical alternative. A technique that has been developing over the past two decades is the strengthening of bridges using carbon fiber reinforced polymer (CFRP) sheets. The CFRP sheets are attached to the bottom of the bridge girders using structural adhesives so that the CFRP becomes an integral part of the bridge and carries a portion of the flexural loading. The CFRP sheets allow for an increase in the capacity of the bridge with minimal increase in the weight of the structure due to CFRP having a low density. Because the CFRP is expected to be an integral component and carry some of the long-term loading it is important to understand the long-term durability of the composite section. This thesis is part of a larger project, in which the long-term durability of the CFRP composite on concrete beams is investigated experimentally. The CFRP strengthened beams are exposed to fatigue testing and thermal-humidity cycling followed by failure testing. The testing scheme for this experiment allows for the investigation of the individual effects of fatigue and thermal-humidity loading as well as to explore the effects from combined fatigue and thermal-humidity loading. The investigation of the combined effects is a unique aspect of this experiment that has not been performed in prior studies. Results indicate that a polyurethane-based adhesive could provide a more durable bond for the CFRP-concrete interface than possible with epoxy-based adhesives.M.S.
Department of Civil and Environmental Engineering
Engineering and Computer Science
Civil Engineering MS
8
Barberio, Francesco. "Nanofibre contenenti grafene per la modifica di compositi laminati: ottimizzazione del processo di elettrofilatura." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2020. http://amslaurea.unibo.it/20745/.
Abstract:
I compositi laminati, specialmente i Carbon Fiber Reinforced Polymers (CFRPs), possiedono ottime proprietà meccaniche ed un peso contenuto rispetto i materiali metallici. Uno dei problemi più importanti che i laminati presentano è il cedimento per delaminazione, ovvero il distaccamento delle lamine che costituiscono il composito, in seguito a sollecitazioni esterne e/o alla presenza di difetti formati durante il processo di lavorazione. Per poter minimizzare tale fenomeno sono stati studiati vari metodi; fra questi vi è l’utilizzo di tessuti nanofibrosi che, intercalati fra le lamine, riescono ad ostacolare efficacemente la propagazione della cricca. Nel presente lavoro di tesi sono stati prodotti, mediante elettrofilatura, tessuti nanofibrosi polimerici additivati con grafene, da impiegare per la modifica strutturale di compositi laminati. In particolare, è stata svolta l’ottimizzazione delle soluzioni (concentrazione polimero, sistema solvente) e dei parametri di processo (potenziale, portata, distanza ago-collettore) per diversi materiali polimerici. Per effettuare un’efficiente dispersione del grafene sono stati effettuati vari cicli di sonicazione. Le membrane sono state caratterizzate morfologicamente mediante microscopia elettronica (SEM) e termicamente mediante calorimetria differenziale a scansione (DSC). Infine, sono stati prodotti tessuti di grandi dimensioni adatti ad essere integrati, prossimamente, in compositi laminati per verificarne l’efficacia contro la delaminazione.
9
Dawood, Mina Magdy Riad. "Fundamental Behavior of Steel-Concrete Composite Beams Strengthened with High Modulus Carbon Fiber Reinforced Polymer (CFRP) Materials." NCSU, 2005. http://www.lib.ncsu.edu/theses/available/etd-06292005-192140/.
Abstract:
There is a growing need for a cost-effective, durable repair system that can be used for the repair and strengthening of steel bridges. Recently, high modulus carbon fiber reinforced polymers (CFRP) have been developed with a modulus of elasticity approximately two times greater than that of steel. Externally bonded high modulus CFRP materials have successfully been used to increase the elastic stiffness and ultimate capacity of steel-concrete composite beams However, since the technology is relatively new, the detailed behavior of steel bridge members strengthened with high modulus CFRP is not yet well understood. The current research investigates three aspects of the behavior of steel-concrete composite beams in detail. An experimental program was conducted to investigate the behavior of steel-concrete composite beams strengthened with high modulus CFRP materials. In the first phase of the study the behavior under overloading conditions was investigated. In the second phase of the research, the fatigue durability of the system was examined. In the third phase, the possible presence of shear-lag between the steel beam and the CFRP materials was investigated in detail. An analytical model was developed which can be used to determine the ultimate capacity and elastic stiffness increase for steel beams strengthened with high modulus CFRP materials. Additionally, a set of criteria are proposed which can be used to determine the allowable increase in the live load level for steel beams strengthened with high modulus CFRP materials.
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Huang, Jia. "Rapid determination of fatigue behaviour for carbon fiber reinforced polymer laminates based on thermodynamic phenomena observed by IR thermography." Thesis, Toulouse 3, 2019. http://www.theses.fr/2019TOU30033.
Abstract:
Afin de réduire le poids des structures composites et les coûts de fabrication et d'exploitation, le comportement en fatigue des stratifiés carbone fait l'objet d'une grande attention. Les objectifs de cette thèse sont de développer des méthodologies pour évaluer rapidement le comportement en fatigue des stratifiés carbone à partir de l'analyse des données thermodynamiques mesurées par une caméra infrarouge et d'examiner la corrélation entre la dissipation d'énergie et les dommages générés par la fatigue. Trois nouvelles méthodes numériques basées sur l'analyse statistique dans le traitement des données thermiques ont tout d'abord été proposées afin d'éviter les incertitudes humaines dans l'application des méthodes graphiques traditionnelles telles que la méthode de Luong et celle de Risitano. Ces trois méthodes ont toutes été évaluées en déterminant la limite de fatigue avec unicité selon les données expérimentales de la littérature. Ensuite, un modèle à deux paramètres a été proposé pour caractériser la dégradation de la rigidité des stratifiés carbone en fonction de l'augmentation du nombre de cycles. Après la calibration des paramètres et le calcul du seuil de la rigidité normalisée, toute la courbe S-N peut être obtenue dans un temps très court. Ensuite, la relation entre les phénomènes de fatigue et la génération de chaleur est étudiée. En fonction des différentes causes, la chaleur générée a été classée en deux parties : chaleur induite par le frottement interne et celle induite par l'accumulation de dommages. La production totale de chaleur correspondant aux dommages semble être indépendante de l'amplitude de la charge. Cette information peut donc être utilisée pour prédire la courbe S-N avec une bonne précisionIn order to achieve weight reduction of composite structures and reduce manufacturing and operating costs, fatigue behavior of Carbon Fiber Reinforced Polymer (CFRP) laminates has received more and more attention. The objectives of this thesis are to develop methodologies to evaluate the fatigue behavior of CFRP laminates in a short time based on the analysis of thermodynamic data measured by an infrared camera and to investigate the inherent correlation between energy dissipation and fatigue damage. Three new numerical methods based on statistical analysis for the treatment of the thermal data are firstly proposed to avoid man-made uncertainties in the traditional graphic methods such as Luong's method and Risitano's method. Those proposed methods are all evaluated by the experimental data from literature to determine the fatigue limit with uniqueness. Then, a two-parameter model is proposed to characterize the stiffness degradation of CFRP laminates with the increase of cycle numbers. After the calibration of parameters and the calculation of the normalized failure threshold stiffness, the whole S-N curve can be obtained in a very short time. Thereafter, the relationship between fatigue damage and heat generation is studied. Depending on the different causes, the generated heat is classified into two parts - induced by internal friction and induced by damage accumulation. The total heat generation corresponding to damage appears to be independent of loading amplitude, and this conclusion can also be used to predict the S-N curve with good precision
Books on the topic "Composite laminate in Carbon Fiber Reinforced Polymer (CFRP))":
1
Fawzia, Sabrina. Bond characteristics between steel and carbon fibre reinforced polymer (CFRP) composites. 2007.
Book chapters on the topic "Composite laminate in Carbon Fiber Reinforced Polymer (CFRP))":
1
Al-Rousan, Rajai Z., Khairedin M. Abdalla, and Bara’a R. Alnemrawi. "The Behavior of Heat-Damaged RC Beams Reinforced Internally with CFRP Strips." In Lecture Notes in Civil Engineering, 165–74. Cham: Springer Nature Switzerland, 2024. http://dx.doi.org/10.1007/978-3-031-57800-7_15.
Abstract:
AbstractWhen an RC (reinforced concrete) structure is prone to a very high temperature, the structure severely deteriorates; the reasons for this are: a) the degradation in the products of the cement hydration, b) the production of vapor’s pressure, and c) the incompatible change in the volumes of the components of concrete when the temperature is higher than 500 °C. Nevertheless, the structures damaged severely by excessive heat can be greatly able to re-have their original performance and qualities back if they are strengthened in shear with laminated CFRP (a short form for carbon fiber-reinforcement polymers) composites. However, the efficiency of this method is menaced because of two setbacks: 1) delamination, and 2) anchorage. This method aimed to examine its efficacy in reinforcing-in-flexural concrete beams, whether mainly or additionally, prior to and post being exposed to very high temperatures. In this paper, the study parameters were: 1) the CFRP sheet’s length of CFRP; and 2) the exposed temperature. Also, the researchers took into consideration to monitor: the structure’s behavior, the ultimate capacity of loading, the correspondent-to-loading deflections, toughness, and elastic stiffness. This research paper found that using internally installed sheets of CFRP for flexural strengthening proved to be highly efficient in damaged-by-heat RC beams.
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Ozkan, Dervis, Mustafa Sabri Gok, and Abdullah Cahit Karaoglanli. "Carbon Fiber Reinforced Polymer (CFRP) Composite Materials, Their Characteristic Properties, Industrial Application Areas and Their Machinability." In Advanced Structured Materials, 235–53. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-39062-4_20.
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Lu, Guangchen, Yinhang Ma, Minyang Wu, Boshuo Yang, Liu Liu, and Fujun Yang. "Mechanical Characterization of Laminated Carbon Fiber Reinforced Polymer." In Advances in Transdisciplinary Engineering. IOS Press, 2023. http://dx.doi.org/10.3233/atde230162.
Abstract:
Experimental method was employed to investigate mechanical characterization of carbon fiber reinforcement polymer (CFRP) composite beams at different temperatures. The experimental research is mainly based on the vibration response measurement by using the technique of electronic speckle pattern interferometry (ESPI), which can provide visualization of vibrating information represented as fringe patterns. The first ten order of out-of-plane mode shapes and natural frequencies at different temperatures are obtained by ESPI method. Based on the Euler-Bernoulli beam theory, the flexural moduli of the CFRP laminate was determined. The changes in the vibration response and modes of 0 degree off-axis CFRP beams at different temperatures has been investigated in this paper.
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Chen, Quanshi, Yanwei Xu, Wensheng Li, Chao Shen, Shiguang Chen, and Hao Li. "Investigation of the Influence of Delamination Characteristics on the Mechanical Properties of CFRP." In Advances in Transdisciplinary Engineering. IOS Press, 2023. http://dx.doi.org/10.3233/atde230165.
Abstract:
Carbon fiber reinforced polymer (CFRP) composites have been widely used in aviation, aerospace and other fields due to their excellent mechanical properties. However, it is difficult to observe delamination damage during the manufacturing, machining, assembling as well as transportation of composite materials, especially for joint structures. The delamination around joint hole is one of important factors for their service performance. In this paper, a model of composite laminate with delamination damage is established by combining numerical simulation methods and the experimental investigation of CFRP parts with delamination defects. Then, the influence of different delamination characteristics (diameter, position and shape) on the mechanical properties and failure process of the laminate under different loading conditions were investigated, and the results were verified through experimental validation. By comparing the experimental and simulation results, it can be concluded that all three factors have a great influence on the compressive static load strength and compressive fatigue life of the laminate, and the form of delamination expansion and stress distribution cloud diagram of the laminate under each delamination feature are also studied, to investigate the failure mechanism and the type of delamination expansion of the laminate. Finally, ANOVA was used to analyze the effects of different delamination characteristics on the compression strength and fatigue life of the laminates.
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Sahoo, Pradeep Kumar, and Bikash Kumar Pradhan. "FE-BASED FATIGUE ANALYSIS OF UNNOTCHED COMPOSITE LAMINATE USING STIFFNESS DEGRADATION APPROACH." In Futuristic Trends in Mechanical Engineering Volume 3 Book 6, 15–34. Iterative International Publisher, Selfypage Developers Pvt Ltd, 2024. http://dx.doi.org/10.58532/v3bgme6p1ch2.
Abstract:
The composites such as carbon fibre reinforced polymer (CFRP)/ glass fibre reinforced polymer (GFRP) composite material are being extensively used in aerospace industries for aircraft primary structural elements. The fatigue evaluation of composites is very complex and challenging. To the authors' knowledge, no computational tools are available to predict the fatigue life of composites. This project aims to carry out an FE-based fatigue analysis to estimate the fatigue life of GFRP composite aircraft structural elements by performing progressive damage growth analysis (PDGA) based on the stiffness degradation rule up to last ply failures (LPF). A glass fibre-reinforced plastic (GFRP) composite laminate, according to the Chinese standard of materials testing GB/T1447 2005 [1], is considered in the analysis. Two stacking sequences [45/90/-45/0]s and [45/0/0/-45]s are considered. First, the static analyses are conducted on GFRP composite laminate for various applied loads using LPF-based PDGA to determine the static strength of the laminate using Tsi-Wu failure criteria. Then, a similar procedure using the Tsi-Wu failure criterion is followed for the fatigue analyses to assess the fatigue strength of the laminate with the above two stacking sequences by using S-N data of the unidirectional composites for longitudinal, transverse and shear directions. FEA predicted fatigue strength results are slightly more than the experimental results. This trend may be because the delamination and debonding occurring in the experiment (which is a real scenario) are not considered in FEA. The error %age in fatigue strength for 103 cycles is of the order of 5% for [45/0/0/-45]s laminates and 7% for [45/90/-45/0]s laminate. This study is essential for evaluating the structural integrity of composite airframe structures.
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Acharya, Aniket, Anant Kumar Singh, Aayaam Agarwal, and Vikas Rastogi. "Analysis of Delamination Damage and Eigenvalue Buckling of Lap Joint in CFRP Laminates Using Finite Element Method." In Advances in Transdisciplinary Engineering. IOS Press, 2022. http://dx.doi.org/10.3233/atde220814.
Abstract:
Delamination damage is a characteristic damage which is observed in composite laminates. Delamination damage can be very disastrous, hence delamination analysis for any CFRP structure is necessary. In this paper epoxy carbon woven (230 GPa) Prepreg laminates was used as the adherend and FM-300K was used as adhesive to form a lap shear joint. The model was created using ANSYS ACP and analysis of delamination damage was done using 3D non-linear finite element method. Longitudinal buckling load was applied to study the eigenvalue buckling and deformation in different modes. Adhesive bonded lap shear joint made of fibre reinforced polymer (FRP) considering flat geometry subjected to longitudinal load has been investigated. The results were obtained for 10 modes in this analysis. Interpretation of the results shows that deformation decreases with increase in modes. It was also inferred that deformation is much smaller in modes where buckling occurs in two planes. Tsai-Wu failure criterion was used to observe the failure layers in the composite laminate structure. Crack Closure Technique was used to find out the strain energy release rates. It was observed that peel stress and shear stress in the inter laminar region was three dimensional in nature.
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Al-Abdwais, Ahmed H., Riadh S. Al-Mahaidi, and Adil K. Al-Tamimi. "Bond Strength of NSM CFRP Textile and Concrete Using Modified Cement-Based Adhesive at High Temperature Site Exposure." In Advances in Transdisciplinary Engineering. IOS Press, 2023. http://dx.doi.org/10.3233/atde230760.
Abstract:
Retrofitting of concrete structures has recently become a major issue worldwide due to design errors, earthquake damages and the deterioration by the exposure to the harsh environmental conditions, in addition to increase of loads carrying capacity of the structures. CFRP composites have been used efficiently to strengthening of concrete structures using epoxy adhesives to increase the service life of structures and increasing the applied loads. However, the limitations of using epoxy resin only at low temperature below the glass transition temperature, has created a need to replace the epoxy adhesives with cementitious bonding materials to provide better resistance at high temperatures environments. This program assessed the bonding between near-surface mounted (NSM) carbon fibre reinforced polymer (CFRP) Laminate and concrete using modified cement–based adhesive at site exposure in high temperature environment. The study showed a significant resistance of modified cement adhesive as a bonding material at high temperature environment compared to epoxy adhesive.
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Gangu Naidu, Challa, Challa V. V. Ramana, Yarraguntla Srinivasa Rao, Kollabathula Vara Prasada Rao, Dadi Vasudha, Gandi Anusha, and Koppisetty B. Rajeshbabu. "A Concise Review on Carbon Fiber-Reinforced Polymer (CFRP) and their Mechanical Significance Including Industrial Applications." In Carbon Nanotubes - Recent Advances, New Perspectives and Potential Applications [Working Title]. IntechOpen, 2023. http://dx.doi.org/10.5772/intechopen.109339.
Abstract:
Excellent characteristics of carbon fiber-reinforced polymer (CFRP) include light weight, high strength, high modulus, and high temperature resistance. CFRP has a wide range of potential applications in the domains of public safety, aviation, and high-end non-military people products. Different methods have been used to modify the CFRP in order to increase surface action, harshness, and wettability, improving the interfacial binding between the fiber and network for better mechanical properties. Finally, a few CFRP-related difficulties are looked at, and future directions in interfacial support research are predicted. In this day and age, innovation-focused applications are becoming more significant, and the use of mechanical cycles is progressing swiftly and steadily. Due to their exceptional performance, such as low weight, high specific strength, and high specific stiffness, carbon fiber-reinforced polymer (CFRP) composites have a wide application viewpoint in the aerospace, military, and wind power sector high-quality civilian products. Currently, there is still a significant discrepancy between the theoretical calculation of the CFRP and the actual force. Improving the interface rationally is the key to solving this fundamental issue. The development, properties, and contemporary applications of CFRP composite materials, as well as their processing and boring activities, are discussed in this overview along with recent innovations and potential future applications.
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Olofin, IfeOlorun, and Ronggui Liu. "The Effect of Temperature on the Mechanical Performance of Steel and Carbon Fiber Reinforced Polymer (CFRP) Tensegrity System." In Composite Materials [Working Title]. IntechOpen, 2019. http://dx.doi.org/10.5772/intechopen.90010.
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Shakouri Mahmoudabadi, Nasim, and Charles V. Camp. "Rapid Analysis of CFRP-Reinforced Concrete Structures Using Artificial Neural Networks." In Advanced Optimization Applications in Engineering, 60–96. IGI Global, 2024. http://dx.doi.org/10.4018/979-8-3693-2161-4.ch004.
Abstract:
This study examines the vital role of artificial neural networks (ANNs) in predicting and optimizing carbon fiber-reinforced polymer (CFRP) reinforced concrete structures. ANNs excel in modeling complex non-linear relationships, making them ideal for analyzing composite materials' intricate behavior. The review covers ANNs' fundamental principles, CFRP materials, reinforcement techniques, and the challenges of coupling multiple design parameters. It investigates ANNs' potential to model these complexities through multivariate input parameters and ensemble techniques, highlighting current ANN-based practices like response surface models. The study suggests overcoming limitations with advanced feature engineering, hybrid modeling, and embracing emerging technologies. It emphasizes the transformative potential of integrating ANNs and CFRP in designing more efficient, durable, and sustainable concrete structures.
Conference papers on the topic "Composite laminate in Carbon Fiber Reinforced Polymer (CFRP))":
1
BHAGANAGAR, SIDDHARTH, PIAS KUMAR BISWAS, MANGILAL AGARWAL, and HAMID DALIR. "CELLULOSE NANOFIBERS (CNF) REINFORCED CARBON FIBER/EPOXY MATRIX COMPOSITE WITH HIGHER MECHANICAL PROPERTIES." In Proceedings for the American Society for Composites-Thirty Seventh Technical Conference. Destech Publications, Inc., 2022. http://dx.doi.org/10.12783/asc37/36405.
Abstract:
The effect of the Cellulose Nanofibers (CNF) compositions, their morphology on carbon fiber, and subsequent mechanical properties have been explored in this work. The CNF composite nanofiber networks were introduced as interleave layers to improve the interlaminar shear strength (ILSS) of an epoxy/carbon fiber laminate composite. Dry carbon fiber was coated by different volume fractions of CNF (0.6wt%, 0.8wt%, 1wt%) through the sonication process. The CNFs volume fraction and delamination properties of enhanced carbon fiber reinforced polymer (CFRP) laminates have been studied. It is shown that when the dry carbon fiber was treated with CNF, the laminate shows greater mechanical strength in certain cases. The application of CNF composite nanofiber networks as an interleaved layer in an epoxy/carbon laminate increased the delamination resistance of the ILSS in both 0.8wt% and 1wt% CNF by 27.2% and 12.4% respectively, while compared to the neat control sample. This result suggests that CNF could enhance the delamination resistance of an epoxy/carbon laminate undergoing stress and deformation. This result is attributed to crack path modification, and load energy absorption by higher modulus CNFs reinforced nanofibers interleave in the laminate resulting in a higher shear modulus to the networks.
2
Liping, Zhao, Pang Boon Inn, and Zhong Zhaowei. "Thermal wavefront sensing for defect inspection of carbon fiber reinforced polymer (CFRP) composite laminate." In 2012 Quantitative InfraRed Thermography. QIRT Council, 2012. http://dx.doi.org/10.21611/qirt.2012.377.
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Akter, Rizwana, and Oliver J. Myers. "Fabrication of a 3D Bistable Composite." In ASME 2020 Conference on Smart Materials, Adaptive Structures and Intelligent Systems. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/smasis2020-2365.
Abstract:
Abstract Bistable composites have created much attention in engineering applications because of its ability to sustain two stable shapes. A systematic layup of carbon fiber reinforced polymer (CFRP) causes bistability in a lamina. The transition from one stable shape to another is occurred by snap-through and snap-back process. Due to their adaptive nature a lot of study has been conducted on a 2D laminate for over the past 30 years. However, fabrication of a 3D model that exhibits bistability is yet to be explored. In this research we fabricated a 3D bistable composite structure having two parallel cross-ply square laminates connected by a rigid tab at one edge. The entire structure exhibits bistability when the two laminates are actuated simultaneously. The parallel laminates are also independent when actuated individually, making the model achieve four independent stable shapes. Our goal is to understand the bistable behavior and predict the degree of curvature and the snap through response of the solid structure. This paper discusses the fabrication of a solid composite structure that can be further analyzed numerically by creating an FEA model using ABAQUS. The simulation results could be validated experimentally. In this research we also aim to put together an analytical model of this 3D laminate structure. Successful fabrication and mathematical analysis of our 3D laminate using carbon fiber reinforced polymer will hopefully inspire additive manufacturing of bistable composite structure that will lead to more complicated design of bistable materials with more morphing characteristics.
4
LABIK, TIM ,., JONATHAN AWERBUCH, and TEIN-MIN TAN. "FAILURE PREDICTION IN LARGE SCALE COMPOSITE LAMINATES CONTAINING BONDED REPAIRS." In Proceedings for the American Society for Composites-Thirty Eighth Technical Conference. Destech Publications, Inc., 2023. http://dx.doi.org/10.12783/asc38/36584.
Abstract:
A finite element (FE) based predictive framework, incorporating NASA’s CompDam composite damage model, has been developed to simulate damage initiation and progression in large carbon fiber reinforced polymer (CFRP) composite laminates containing various scarfed hole configurations. The framework was applied to a CFRP panel with a centrally located double-sided scarf hole. The CFRP laminate is made of carbon/epoxy with layup sequences comparable to transport category aircraft wing skin panels. The experimental work was previously conducted using the Airframe Beam Structural Test (ABST) fixture at the FAA William J. Hughes Technical Center, which can apply combinations of loads simulating various service loading conditions of an aircraft. Results show good correlation between FE analysis and experiment.
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Yousefpour, Kamran, Wenhua Lin, Yeqing Wang, and Chanyeop Park. "Protection of Carbon Fiber Reinforced Polymer Matrix (CFRP) Composite Laminate Against Lightning Strike Using Nano-Fillers." In 2020 IEEE Conference on Electrical Insulation and Dielectric Phenomena (CEIDP). IEEE, 2020. http://dx.doi.org/10.1109/ceidp49254.2020.9437508.
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ANDREOZZI, M. "Effect of carbon nanotube content on the mechanical behaviour of CFRP composite materials." In Italian Manufacturing Association Conference. Materials Research Forum LLC, 2023. http://dx.doi.org/10.21741/9781644902714-41.
Abstract:
Abstract. The present investigation aims at studying the effect of carbon nanotubes (CNTs) content on the mechanical performances of carbon fiber reinforced polymer (CFRP) composite materials. To this purpose, percentages of carbon nanotubes, ranging from 0.5 to 4%, were dispersed in the epoxy resin used to impregnate carbon fibers. Tensile and flexural tests were performed in order to evaluate the effect of CNTs content on the tensile and flexural performances of CFRP composites reinforced using different percentages of carbon nanotubes. Furthermore, a scanning electron microscopy analysis was carried out in order to analyze the dispersion of the CNTs in the composite laminates. The results showed that the addition of nanofillers up to the value of 3% leads to an improvement in the tensile and flexural performances of CFRP composites.
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Jafarli, Ilgar, and Umesh-Haribhai Vavaliya. "Mechanical behavior of I-beams reinforced by unidirectional carbon fibre, unidirectional glass fiber and carbon fibre laminates." In 22nd International Scientific Conference Engineering for Rural Development. Latvia University of Life Sciences and Technologies, Faculty of Engineering, 2023. http://dx.doi.org/10.22616/erdev.2023.22.tf144.
Abstract:
Industry demands new engineering and material solutions. One of these solutions are fibre reinforced polymers. They are light and strong for application as a material for I-beams. An I-beam is the best section for a homogeneous material because of the highest resistance moment. The popularity of composite materials introduces wide use in most branches of engineering and mostly as fibre reinforced polymers (FRP). This paper presents numerical and analytical studies on the mechanical behaviour of the I-beams made of fibre reinforced polymers reinforced by glass fibres (GFRP) and carbon fibres (CFRP) comparing to the structural steel S235JR. Five I-beams with different composite structures and one steel I-beam were numerically tested. Four-point test according to ASTM C 78 – 02 was conducted. Numerical simulation made in SOLIDWORKS software in the Static simulation mode was used. The obtained results were analysed and an attempt to determine the optimal parameters for combination of different composite materials was conducted. As a result of numerical analysis values of deflection and normal stress were obtained for polymer I-beam reinforced by glass and carbon fibres comparing to the steel I-beam.
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Kotikalapudi, Sai Tharun, and Raman P. Singh. "Mechanical Strength Degradation of Carbon Fiber Polymer Matrix Composites Exposed to Constant Low-Density Direct Current." In ASME 2019 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/imece2019-12259.
Abstract:
Abstract Carbon fiber reinforced composites (CFRP) can experience two dissimilar magnitudes of direct current during a lightning strike on an aircraft, a concentrated catastrophic high current followed by low direct current spread across the surface. Low density direct current can also occur in multifunctional composite structures for resistive heating, energy harvesting and storage. These direct currents lead to material degradation. Since CFRP structures are more susceptible to a lightning strike due to weak electrical and thermal conductivity compared to metallic bodies, considerable amount of research has been done to study the effects of instantaneous high current on mechanical properties. With the ever-growing demand for tailorable multifunctional composites, the effect of low direct current on mechanical properties of CFRP should be investigated. An experiment is designed to study the long-term exposure of low-density electric field effects on CFRP which are often coupled with detrimental thermal effects. In this study, experiments have been performed using an in-house setup to study the electrical effects of low constant direct current (DC) on cross-ply CFRP laminates. A constant current study has been conducted to characterize the voltage across the laminate over a period. The strength of the polymer depends on the integrity and type of bonds, the observed resistance change is a perceptible way of demonstrating the change in mechanical properties. The combined effect of electrical and thermal fields has been studied by mapping the surface temperatures continuously on the entire length of the laminate. Preliminary research showed that the presence of non-conducting epoxy undergoes localized dielectric breakdown near the carbon epoxy interface. In order to quantify the degradation, combined loading compression (CLC) and dynamic mechanical analysis (DMA) tests have been performed for coupon size samples which have been electrically degraded for a definite period. Compression test results are compared with electrical characterization and glass transition temperatures from DMA results.
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Meon, Mohd Suhairil. "Finite Element Analysis of Low-Velocity Impact Carbon Fiber-Reinforced Polymer (CFRP) Composite Laminate Emphasizing on Meshing Technique." In International Conference on Nanoscience and Nanotechnology 2022. Switzerland: Trans Tech Publications Ltd, 2023. http://dx.doi.org/10.4028/p-9hbg70.
Abstract:
This paper presents the performance of the three-dimensional progressive damage model using Puck failure criteria gradual degradation law to predict the structural responses, as well as the onset and propagation of failure due to different meshing techniques. The proposed damage model is performed using Abaqus explicit analysis. Three meshing strategies are analyzed using a solid element finite element model based on low-velocity impact loading. The structural responses are compared with experimental data taken from literature to measure the performance of such damage model. The results revealed that the models adopted here respond well to experimental data and demonstrate acceptable results in predicting the inter- and intra-laminar damage of the composite laminate.
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Parandoush, Pedram, Timothy Deines, Dong Lin, Hao Zhang, and Chang Ye. "Mechanical Finishing of 3D Printed Continuous Carbon Fiber Reinforced Polymer Composites via CNC Machining." In ASME 2019 14th International Manufacturing Science and Engineering Conference. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/msec2019-2972.
Abstract:
Abstract 3D printing technology could be extremely beneficial for increasing the flexibly and reducing the cost of carbon fiber reinforced polymer composite (CFRP) production. However, this technology suffers from poor surface quality and uncertain engineering quality. Mechanical finishing processes could concurrently solve these surface issues with the 3D printed composites components. Herein, a mechanical finishing process for 3D printed CFRP composites via CNC milling is proposed to improve the surface quality of two 3D printing methods, namely fused deposition modeling (FDM) and laser assisted-laminated object manufacturing (LA-LOM). The 3D printed CFRP structures fabricated via both methods comprise of continuous carbon fiber reinforcement. The surface roughness and surface morphology of the original unfinished and finished surfaces with various cutting depths are extensively studied to investigate the feasibility of the proposed finishing technique. The surface morphology of the surfaces parallel and perpendicular to the 3D printed layers is the main focus of this work. After the CNC finishing process, the surface roughness of the 3D printed CFRP composites is improved by 70% and 60% for FDM and LA-LOM components, respectively. A smooth, consistent, and predictable surface morphology is achieved for various cutting depths demonstrating a substantial improvement over the original 3D printed surfaces.
Reports on the topic "Composite laminate in Carbon Fiber Reinforced Polymer (CFRP))":
1
Wang, Hao, Milad Salemi, Jiaqi Chen, P. N. Balaguru, Jinhao Liang, and Ning Xie. DTPH56-15H-CAP04L An Inorganic Composite Coating for Pipeline Rehabilitation and Corrosion Protection. Chantilly, Virginia: Pipeline Research Council International, Inc. (PRCI), December 2018. http://dx.doi.org/10.55274/r0011991.
Abstract:
The project aims to address the need for an inorganic coating composite for corrosion protection of pipelines in an aggressive environment. The inorganic coating does not generate CO2 emission or volatile organic content (VOC). Inorganic coatings are frequently used in the construction industry as anti-corrosion coatings, which are effective, chemically inert, hard, and thermally stable. In this study, microfiber reinforcement and Nano-modification were used to improve the performance of the inorganic coating system. The research work integrates both laboratory testing and numerical simulations. The major tasks conducted are 1) development of an inorganic coating with Nano modification; 2) accelerated corrosion testing; 3) durability and adhesion strength testing; 4) shear testing of coating with carbon fiber reinforced polymer (CFRP), and 5) analytical study of composite repair system of the pipeline.