Relevant bibliographies by topics / CFRP

Academic literature on the topic 'CFRP'

Author: Grafiati
Published: 4 June 2021
Last updated: 14 March 2023

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Journal articles on the topic "CFRP"

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Zuo, Jian Dong, and Chao Yun Luo. "Piezoresistive Property of Carbon Fiber Reinforced Plastics." Key Engineering Materials 575-576 (September 2013): 174–78. http://dx.doi.org/10.4028/www.scientific.net/kem.575-576.174.

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Carbon fiber reinforced plastics (CFRP) were prepared by manual molding technology and the effect of loading speed on the piezoresistive property of CFPR was discussed. The piezoresistive sensitivity of CFRP with the different content of carbon fibers was contrasted and the interface morphology of CFRP was observed by SEM. The results show that CFRP has the obvious piezoresistive property and it can provide early warning as a kind of strain sensor. The piezoresistive sensitivity of CFRP decreases as the increasing of the content of carbon fibers in CFRP. Moreover the piezoresistive sensitivity of CFRP reduced as the increasing of loading speed. The SEM showed that the interface was good between carbon fibers and epoxy resin.
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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.

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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.
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Okayasu, Mitsuhiro, Yuki Tsuchiya, and Hiroaki Arai. "Experimentally and analyzed property of carbon fiber reinforced thermoplastic and thermoset plates." Journal of Materials Science Research 7, no. 3 (June 30, 2018): 12. http://dx.doi.org/10.5539/jmsr.v7n3p12.

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The tensile and fatigue properties of long unidirectional (UD) and crossply (CR) carbon fiber reinforced plastics (CFRPs) were investigated. The CFRPs in this study were fabricated from 60% CF and various resins: epoxy, polyamide (PA6), polyphenylene sulfide (PPS), and polyether ether ketone (PEEK). The ultimate tensile strength sUTS of Epoxy-CFRP was found to be about twice that of PEEK-CFRP. Relatively high tensile strengths were found for PPS- and PA6-CFRP in the thermoset resin group, although these were still only about 85% of the strength of epoxy-CFRP. The tensile and fatigue strengths of the CR-CFRPs were less than half those of the UD-CFRPs, even though high ductilities were found for the CR-CFRPs. These high ductilities can be attributed to the crosslinking fiber effect and the low proportion of CFs in the loading direction. The sUTS values of CFRPs depend not only on the tensile strengths s and volume fractions V of CF and resin (i.e., through the conventional compound law sUTS = sfiberVfiber + sresinVresin), but also on several material properties, including the wettability of the CF by the resin. On the basis of the material properties, the ultimate tensile strengths of various UD- and CR-CFRPs were well estimated numerically through a statistical analysis, which afforded better estimates than those obtained from the compound law.
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Moon, Jae Sang, Da Young Kim, Myeong Seop Ko, and Changhyuk Kim. "Performance of Reinforced Concrete Beams Strengthened by Bidirectional Carbon-Fiber-Reinforced Polymers Based on Numerical Models." Polymers 15, no. 4 (February 17, 2023): 1012. http://dx.doi.org/10.3390/polym15041012.

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The use of carbon-fiber-reinforced polymers (CFRPs) for the repair and rehabilitation of reinforced concrete (RC) structures has been receiving a lot of attention. Specifically, the shear strengthening of RC members based on CFRP materials has been treated as an effective and efficient strengthening method. Previous research projects focused on the shear strengthening of RC members with unidirectional CFRP strips. Although the effectiveness of a bidirectional CFRP layout compared to a unidirectional CFRP layout was discussed in several studies, these studies only investigated the issue based on experiments. Morever, the parameters of the bidirectional CFRP layout were not clearly defined. This study investigates the performance of RC beams strengthened by bidirectional CFRP based on numerical models. A numerical model based on finite element analysis is designed. Using the numerical model, the parameters of the horizontal CFRP strips, such as the layouts of horizontal CFRP strips and the number of horizontal CFRP strips, are studied. The results show that the effect of horizontal CFRP strips is maximized if the strips are distributed along the depth. In contrast, the number of horizontal CFRP strips does not significantly affect the shear strength of RC members.
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Shuai, Tian, and Zhang Tong. "Study on Thermal Stress of Concrete Beams with Carbon-Fiber- Reinforced Polymers at Low Temperature." Open Construction and Building Technology Journal 8, no. 1 (December 12, 2014): 182–92. http://dx.doi.org/10.2174/1874836801408010182.

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Concrete beams reinforced with carbon-fiber-reinforced polymers (CFRPs) are subjected to considerable thermal stress at low temperatures. To mitigate this problem, this study conducts a series of tests on three concrete specimens at various temperatures, analyzes the change rule of thermal stress in CFRP-reinforced concrete beams, and discusses the influence of CFRPs on thermal stress in terms of the elastic modulus, thickness, thermal expansion coefficient, beam height, and concrete grade. The results show that when the temperature decreases, CFRP has an obvious restraining effect on the thermal curve of concrete beams. The thermal stress on the interface of CFRP-reinforced concrete beams is sufficiently large and should not be ignored. In particular, in cold areas, thermal stress should be taken into account when reinforcing structures such as concrete bridges. The CFRP sheet’s elasticity modulus and thickness are the main factors affecting the thermal stress; in comparison, the expansion coefficient and beam height have lesser effect on the thermal stress; finally, the concrete grade has little effect on the thermal stress. Thermal stress can be prevented feasibly by using prestressed CFRP sheets to reinforce concrete beams. This study can serve as a reference for concrete reinforcement design.
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Yang, Yi, Zuodong Wu, Qianziyang Zhou, Jiahao Bai, and Xinyan Guo. "An Experimental Study on Shear Performance of Adhesive Interface between Steel Plates and CFRP." Stavební obzor - Civil Engineering Journal 31, no. 4 (December 31, 2022): 561–70. http://dx.doi.org/10.14311/cej.2022.04.0042.

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CFRP (Carbon Fiber Reinforced Polymer) are widely used in steel structural reinforcement. For steel structures strengthened with CFRP, except the cases the structures have defects before strengthening, the adhesive interface is the weakest part and CFRP debonding is the most common failure mode. In order to investigate the failure mechanism of CFRP strengthened steel structures, this paper presents an experimental study on shear performance of adhesive interface between steel plate and CFRP by twin shear model. Six steel plates strengthened with CFRP are divided into two groups, one has no damage, another has a gap at the mid. The specimens are tested under tensile loadings. The study results show that, the plates with a gap failed for CFRPs debonding, the cracking loading and breaking loading are 14.85kN, and 17.88kN respectively; the strain-loading curves had long linear stages, two strains decrease and other strains of another side increased rapidly at the cracking loading, then they both rose until the plates failed.
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Yang, Yujin. "Dynamic Tensile Properties of CFRP Manufactured by PCM and WCM: Effect of Strain Rate and Configurations." Crystals 11, no. 12 (December 1, 2021): 1491. http://dx.doi.org/10.3390/cryst11121491.

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Carbon fiber-reinforced plastic (CFRP) is a promising material to achieve lightweight automotive components. The effects of the strain rate and configurations of CFRP on dynamic tensile properties have not yet been fully explored; thus, its lightweight benefits cannot be maximized. In this paper, the dynamic tensile properties of CFRPs, tested using two different processes with two different resins and four different configurations, were studied with a strain rate from 0.001 to 500 s−1. The tensile strength, modulus, failure strain, and fracture mechanism were analyzed. It was found that the dynamic performance enhances the strength and modulus, whereas it decreases the failure strain. The two processes demonstrated the same level of tensile strength but via different fracture mechanisms. Fiber orientation also significantly affects the fracture mode of CFRP. Resins and configurations both have an influence on strain rate sensitivity. An analytic model was proposed to examine the strain rate sensitivity of CFRPs with different processes and configurations. The proposed model agreed well with the experimental data, and it can be used in simulations to maximize the lightweight properties of CFRP.
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Borri, Antonio, Marco Corradi, Romina Sisti, Alessio Molinari, and Chiara Quintaliani. "Local FRP-Reinforcement of Clay Hollow Block Panels under Shear Loading." Key Engineering Materials 817 (August 2019): 450–57. http://dx.doi.org/10.4028/www.scientific.net/kem.817.450.

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The use of clay hollow blocks is common for new constructions in many parts of Europe. The results of 8 full-scale shear tests of block-masonry panels (dimensions 1.60x0.90x0.25 m) are reported in this paper. Non-defective and defective wall panels were tested in shear in the laboratory. Typical failure modes are investigated, not previously reported in the scientific literature. Test results show that the lateral load capacity of the panels is highly affected by construction defects. Furthermore, CFRPs were used in this research as local reinforcement (repair) in the area around the cracks previously opened in the masonry material. The lateral capacity for CFRP-repaired panels was restored to the original value of non-defective panels, indicating that the CFRP-repair of cracked panels is viable solution. An explanation for this phenomenon is suggested, which indicates that the high tensile strength of CFRPs can be effective in repairing cracked block-masonry. It is also argued that this large stress level of the CFRPs leads to a premature tensile CFRP crisis or a splitting failure of the blocks’ shells.
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Phan Viet, Nhut, Yukio Kitano, and Yukihiro Matsumoto. "Experimental Investigations of the Strengthening Effects of CFRP for Thin-Walled Storage Tanks under Dynamic Loads." Applied Sciences 10, no. 7 (April 6, 2020): 2521. http://dx.doi.org/10.3390/app10072521.

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In this study, the strengthening effects of different lamination conditions on carbon fiber reinforced polymers (CFRPs) for thin-walled storage tanks (TSTs) subjected to internal pressure under dynamic loads were experimentally investigated. A total of three small-scale models of TSTs were used for the investigation, including non-strengthened specimens, specimens strengthened with 0° CFRP layers, and specimens strengthened with 0°/90° CFRP layers. There were two types of tests for every specimen: the static and dynamic tests. A new experimental method using small steel balls was applied to create internal pressure in the TSTs. The results show that small steel balls could be used to increase the internal pressure compared to a normal liquid. Furthermore, the similarity rules for small-scale TSTs with small steel balls inside were also studied to consider the applicability of the models. The experimental results indicated that the CFRP layer could effectively restrain both static and dynamic hoop strains in the TSTs. Moreover, the CFRP layer could also remarkably reduce the impact of sloshing on the TST shells. The 0° CFRP layer proved to have better effects than the 0°/90° CFRP layers on the strengthening of the TSTs against dynamic loads.
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OKUYAMA, Kei-ichi, Shigeru HIBINO, and Aleksander LIDTKE. "KINETIC PROPERTY OF A PRESSURE VESSEL MADE FROM CFRP FABRICATED A FILAMENT WINDING METHOD." International Journal of Research -GRANTHAALAYAH 6, no. 3 (March 31, 2018): 140–48. http://dx.doi.org/10.29121/granthaalayah.v6.i3.2018.1507.

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Since the specific strength and the specific elasticity of carbon fiber reinforced plastics (CFRPs) are the greatest in practical materials, they are used abundantly in transport structures. This CFRP can also be used for a pressure vessel which stores liquid hydrazine, the required burst pressure is approximately 22MPa. Many researchers have been studying pressure vessels made from a CFRP fabricated by a filament winding (FW) method. In order to acquire the fundamental mechanical properties of a CFRP container, the small cylinder made from CFRP fabricated by the spiral winding type FW method is designed and manufactured. The winding angle of a carbon fiber of this cylinder is ±45 degrees. The plastic deformation of this cylinder generates from the strain range of 0.7%. So as to confirm by the analytical method that a small tank made from CFRP fabricated by the FW method can be utilized as a tank for liquid hydrazine, an analysis model is created. Since the pressure to which the strain of this CFRP tank reaches to 0.7% is approximately 35MPa, this small tank can be used as a fuel tank for micro satellites.
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Dissertations / Theses on the topic "CFRP"

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El, Bouami Souhail. "Contribution à l'optimisation du perçage des multi-matériaux CFRP/Al2198 et CFRP/Ti6Al4V." Thesis, Amiens, 2017. http://www.theses.fr/2017AMIE0040/document.

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La fabrication de structures hybrides associant pièces métalliques et composites vise à combiner résistance aux sollicitations multiples des pièces de structure et poids global limité, notamment dans l'industrie aéronautique. Les différences importantes de comportement mécanique qui existent entre les deux types de matériaux doivent être prises en considération lors de la mise en place d'une opération de perçage d'une structure hybride. L'objectif de cette thèse est de développer, en se basant sur l'expérimentation, des outils et une stratégie de perçage associée, pour les structures hybrides CFRP/Al2198 et CFRP/Ti6Al4V. Une étude de l'impact de la morphologie de l'outil et de la stratégie d'usinage a révélé un lien entre la morphologie du foret utilisée et les conditions de coupe d'une part, et la qualité du trou percé et les efforts de coupe d'autre part. Les outils proposés dans un premier temps ont combiné différentes morphologies existantes (hélicoïdal à deux lèvres, pointes extrêmes et étagé). Dans un deuxième temps, un outil répondant aux exigences a été développé et associé à une nouvelle stratégie d'usinage comprenant trois phases (ébauche, ½ finition et finition). Enfin, le délaminage en sortie de trou restant une préoccupation majeure lors du perçage des composites carbone à matrice polymère, un modèle analytique permettant le calcul de la force critique avant délaminage a été proposé. Ce travail de thèse a été réalisé dans le cadre d'un projet Industrilab financé par la Région Hauts de France et piloté par STELIA-AEROSPACE
The manufacturing of hybrid structures composite and metal parts aims to combine resistance to multiple stresses and to limit overall weight, particularly in the aviation industry. The significant differences in mechanical behavior that exist between the two types of materials must be taken into account in drilling operations of a hybrid structure. The objective of this thesis is to develop, based on the experimentation, tools and an associated drilling strategy for the CFRP/Al2198 and CFRP/Ti6Al4V hybrid structures. A study of the impact of the morphology of the tool and the machining strategy revealed a link between the morphology of the drill used and the cutting conditions, on the one hand, and the quality of the hole drilled and the thrust force, on the other hand. The tools proposed, at the first step, combine different existing morphologies (twist, square and step drill). In a second step, a tool meeting the requirements was developed and associated with a new machining strategy comprising three phases (roughing, ½ finishing and finishing). Finally, delamination at the exit of the hole remains a major concern when drilling carbon composites, an analytical model allowing the calculation of the critical force before delamination has been proposed. This work is part of Industrilab project financed by the Hauts de France Region and led by STELIA
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Ozdemir, Gokhan. "Mechanical Properties Of Cfrp Anchorages." Master's thesis, METU, 2005. http://etd.lib.metu.edu.tr/upload/12605890/index.pdf.

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Due to inadequate lateral stiffness, many reinforced concrete buildings are highly damaged or collapsed in Turkey after the major earthquake. To improve the behavior of such buildings and to prevent them from collapse, repair and/or strengthening of some reinforced concrete elements is required. One of the strengthening techniques is the use of CFRP sheets on the existing hollow brick masonry infill. While using the CFRP sheets their attachment to both structural and non-structural members are provided by CFRP anchor dowels. In this study, by means of the prepared test setup, the pull-out strength capacities of CFRP anchor dowels are measured. The effects of concrete compressive strength, anchorage depth, anchorage diameter, and number of fibers on the tensile strength capacity of CFRP anchor dowel are studied.
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Chacko, Noel. "Impact Resistance of CFRP Products." Thesis, KTH, Lättkonstruktioner, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-244020.

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This thesis investigated the impact performance of CFRP products within the sports industry. The primary aim of this thesis was to evaluate different configurations, matrix system, and technologies to find the best performing solutions for impact. During this work, an extensive literature study was conducted and various solutions were reviewed. Further on, several tubes were manufactured, impacted and put through a 2 point bending test to find out the residual strength. It was found that TeXtreme R fabrics positively affected the impact performance when compared to conventional fabrics and UD depending on the placement location. Thin plies proved to be better than conventional plies. Newer technologies such as CNT stitching requires further investigation before it can be qualitatively assessed.
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Yee, Jeffrey Cheze Hui. "Thin CFRP composite deployable structures." Thesis, University of Cambridge, 2006. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.614308.

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Karlsson, Marlene. "CFRP strengthening of existing building structures." Thesis, Linköpings universitet, Institutionen för teknik och naturvetenskap, 2007. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-96306.

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Most of the building structures needed in twenty years from now is already built. Building structures are ageing and they deteriorate and often the demands on the structure changes over time. It is often needed to reinforce the structure, especially when reconstructing, repairing or renovating a building. The traditional strengthening methods that are used today are strengthening the structure with beams and columns of steel. The beams and columns often require much space and problems might occur if there are a lot of installations. There is another more modern technique where a composite plate, sheet, grid or bar of relatively small thickness is bonded with an epoxy adhesive to the structure. These reinforcements don’t change the cross-section of the structure. The most common type of fibre reinforcement that is used for strengthening in the building industry is carbon fibre. The carbon fibre products are much more expensive when comparing to steel. Therefore the object of this report is to show when it is economically motivated to use carbon fibre instead of the more traditional material steel. To do this I have studied five real cases brought to me by WSP Construction in Linköping, Sweden. The study shows that in the cases where it’s possible to use composites strengthening the building structure it is also economically motivated to do so. Even if the material is more expensive than the more traditional materials the total cost is in the same price class as the traditional ones because of the short time of construction. But there is still a problem with only a few consultants and entrepreneurs that have the knowledge and the experience to work with composites when strengthening a structure. If the knowledge will be spread to the consultants I will say that carbon fibre composites are the materials of tomorrow even in the building industry.
En stor del av det byggnadsbestånd som kommer att behövas inom en tjugoårsperiod är redan uppfört idag. Byggnadskonstruktioner åldras och försämras, och ofta förändras förutsättningarna för byggnaderna med tiden. Ett ständigt återkommande moment är behovet av att förstärka den bärande konstruktionen, framför allt i samband med ombyggnation, reparation och renovering. De traditionella metoder man använder sig av idag innebär att stålbalkar och pelare monteras för att förstärka konstruktionen. Dessa tar utrymme i anspråk och problem kan uppstå med t ex installationer i tak. En nyare metod innebär att man fäster kolfiberkompositer på ytan av konstruktionen i tunna lager i form av laminat, väv, nät eller stavar som fräses ner i ytan. För att fästa kompositen på ytan använder man sig av epoxi. De tunna lagren gör att konstruktionens tvärsnitt och egenvikt inte förändras märkbart. Då kolfiber är ett dyrare material än stål är syftet med denna rapport att ta fram konkreta praktikfall där det är ekonomiskt motiverat att använda sig av kolfiberkompositer istället för de traditionella metoder som används idag. Fem praktikfall tillhandahållna av WSP Byggprojektering i Linköping har studerats. Det visade sig att i de fall det var tillämpligt att använda sig av kolfiber för förstärkning var det även ekonomiskt hållbart. Trots det dyrare materialet innebär den korta monteringstiden att totalkostnaden för förstärkningsjobbet ligger i ungefär samma prisklass som en förstärkning med stål. Problem kvarstår dock med alltför några kunniga konstruktörer och entreprenörer – men annars är kolfiberkompositen morgondagens material.
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Sivanendran, Shobana. "CFRP prestressed concrete exposed to moisture." Thesis, University of Cambridge, 2017. https://www.repository.cam.ac.uk/handle/1810/270196.

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In environments of high moisture exposure, carbon fibre-reinforced polymer (CFRP) reinforcement is believed to be a good alternative to steel due to its non-corrosive properties. However the CFRP matrix experiences other types of changes, mechanical deterioration and transverse swelling, with exposure to moisture and sustained stresses. Specifically for structural applications, few studies have investigated the effects of moisture and stress-induced matrix-dominated changes to the CFRP-concrete bond when the CFRP rods are cast into concrete as prestressed reinforcement. Experiments were conducted to measure the transverse swelling and moisture uptake rates of stressed and unstressed CFRP rods immersed in water and concrete pore solution (CPS). CFRP rods were also embedded in concrete and immersed in water to observe whether the transverse swelling of the rods would cause the concrete to crack. Pull-out tests were conducted on stressed and unstressed CFRP rods cast in concrete cubes and immersed in water for up to 125 days. Six CFRP prestressed concrete prisms were fabricated, three were immersed in water for over 125 days and three were left in lab conditions before being tested in three-point bending. Moisture-induced transverse swelling did not appear to cause cracking of the concrete covering CFRP rods in water, contrary to the prediction of the thick-walled cylinder model, but possibly caused an increase in the CFRP-concrete radial contact pressure. The imposition of sustained bending stresses on wet CFRP rods was found to cause premature failure, believed to be a result of matrix softening and microcracking. These observations of swelling and matrix degradation were believed to affect the CFRP-concrete bond. The pull-out tests of unstressed CFRP rods indicated an increased likelihood for bond failure in the CFRP matrix with moisture exposure. This resulted in greater variations in the ultimate and residual bond stresses of the wet samples compared to the dry controls. For the prestressed pull-out samples, higher magnitudes of prestressing resulted in lower bond failure loads. Both outcomes are indicative of matrix weakening with moisture and stress exposure. However despite this, the three-point bending tests revealed no significant differences in behaviour between the wet and dry prestressed prisms. Although the wet prisms exhibited slightly greater variation in their post peak load behaviour compared to the dry prisms, in line with the observations from the pull-out tests. The work from this thesis reveals that despite observations of matrix deterioration and transverse swelling in CFRP rods exposed to moisture and stress, the effect of these changes to the overall behaviour of a CFRP prestressed concrete member are minimal. Any long-term effects are unlikely to cause significant changes to the behaviour of the member. However, the CFRP-concrete bond may be more variable in members exposed to moisture, which should be allowed for in the design process. Therefore CFRP is a promising alternative to steel reinforcement in high moisture environments, with good long-term durability.
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Hägg, Jennifer. "Laser direct joining of CFRP and aluminum." Thesis, KTH, Industriell produktion, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-227961.

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Behovet av lätta konstruktioner ökar och nya lättare material används. Dessa behöver fogas samman. Att använda fogning med laser är ett sätt att göra detta och i detta examensarbete utvärderas fogning med laser av kolfiberkomposit (CFRP) och aluminium. Frågeställningarna i detta exjobb har rört huruvida aluminium och CFRP går att foga samman med hjälp av laser och hur hög skjuvhållfasthet som kan uppnås vid överlappsfogning med denna metod. Tre olika aluminiumlegeringar har fogats till PA6-CFRP och därför har även eventuella skillnader mellan fogarna undersökts. Fogning och testning visade att alla tre legeringar var fogbara till CFRP genom fogning med laser och att bindningsytan växte när fogningshastigheten minskade. AA5182 visade sig ge de starkaste fogarna och kunde fogas med CFRP vid en högre hastighet än AA6016 och AF200. AA5182 smälte dock lättare på ytan än de andra legeringarna. Genom LOM (ljusoptiskt mikroskop) och SEM (Svepelektronmikroskop) indikerades att bubblor i CFRP nära gränsskiktet gav starkare fogar än när bubblorna befann sig långt ifrån gränssnittet. Genom SEM-analysering syntes att materialen var tätt sammanfogade med varandra.
The need for light weight structures are growing stronger and new materials is being used. These materials need to be joined together. Laser joining is one possible way of doing that and in this thesis project laser joining of carbon fiber composite (CFRP) and aluminum is being analyzed. The scope of the thesis consists of questions whether aluminum and CFRP are joinable using this method and how high tensile strength that can be obtained in the lap joint. Three different aluminum alloys is being joint to the PA6-CFRP, and therefore it is also interesting to see if there is any difference between the joints. Joining and testing showed that all three alloys were joinable to CFRP through laser joining and that the bonding area increased for decreasing speed. AA5182 achieved the highest strength and was joined to CFRP at a significant higher speed than AA6016 and AF200. On the other hand AA6016 and AF200 did not melt as easily as AA5182.LOM (light optical microscope) and SEM (Scanning Electron Microscope) analysis showed that bubbles in the CFRP close to the interface seemed to give stronger joints than bubbles far away from the interface. Through SEM analyzes it was seen that a tight binding between the materials was achieved.
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Phillips, Benjamin John. "Multidisciplinary optimisation of a CFRP wing cover." Thesis, Cranfield University, 2009. http://dspace.lib.cranfield.ac.uk/handle/1826/4641.

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With the market introduction of both the Airbus A350XWB and the Boeing 787, Carbon Fibre Reinforced Plastics (CFRP) has been applied to primary structure of large commercial aircraft, as a means of enhancing overall performance. Both these aircraft are being developed and produced in a unique way where Airbus and Boeing are acting as System Integrators and using Risk Sharing Partners to develop the majority of the principal components. To support this new business and technological model it is necessary that the System Integrator has sufficient knowledge and tools to support the development of the components. Of particular interest are items such as the wing covers, as they are both heavy and expensive items, thus offering large opportunities for optimisation, in particular when the benefits of applying CFRP are considered. This creates the forum for this thesis, i.e. to thoroughly understand all factors that influence a CFRP wing cover, from which an optimisation methodology is developed, incorporating design constraints, while seeking the lightest weight solution, with a resultant Life Cycle Cost (LCC). Based on this, different solutions can be compared based on weight and LCC. In general stringer-stiffened panels are, from a weight perspective, the optimal configuration for wing covers, and thus are solely considered. Serendipitously, due to their prismatic shapes, buckling calculations of stringer-stiffened panels can be solved with reasonable accuracy and ease using the Finite Strip Method (FSM), as opposed to more time consuming methods such as the Finite Element Method. A suitable FSM program is available from ESDU, which when used in combination with a configured Excel spreadsheet can take into consideration constraints established from the extensive literature review. Once the lowest weight solution is obtained under buckling constraints, the solution is then checked for in-plane and if desired out-of-plane strength. Based on the structurally optimised wing cover, the manufacturing cost is calculated using a Process Based Cost Model (PBCM), which has been developed based on different CFRP materials for the skin and stringer fabrication, as well as suitable manufacturing and integration methods. In order to consider the LCC, i.e. all costs from cradle to grave, the PBCM factors in both the cost of recycling scrap material during manufacture and after retirement. Furthermore, when more than one solution is compared then the Economic Value of Weight Saving, which is based on the range equation, can be factored in to consider the financial benefit of weight saving. The optimisation methodology and PBCM has been evaluated on diverse wing cover examples, which has considered both uni-directional prepreg, non-crimp fabric and braids materials in combination with autoclave and liquid composite moulding techniques. The results demonstrated a trend which can be considered realistic, although the cost estimation is very much dependent on the assumptions made. In conclusion, the thesis and the optimisation methodology can be used to compare different configurations.
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Ross, Joseph Christopher. "Evaluating CFRP-Masonry Bond Using Thermal Imaging." Scholar Commons, 2013. http://scholarcommons.usf.edu/etd/4838.

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This study presents results from non-destructive testing to evaluate the degradation of the CFRP-masonry bond using thermal imaging. The goal of the research was to identify locations where there was evidence of bond deterioration that could subsequently be verified through destructive pull-off testing. Four full-scale masonry walls were built outdoors at the University of South Florida in 1995 to evaluate the effectiveness of CFRP for repairing settlement damage. Two of the settlement-damaged walls were repaired using single layer, commercially available unidirectional CFRP systems that used Tonen (wall 3) and Henkel (wall 2) epoxies. These two walls were the subject of this investigation. Before non-destructive tests were initiated, historical site data on temperature, humidity and rainfall variation was compiled. Over seventeen years, the walls experienced ambient temperatures as high as 98°F and as low as 25°F. The average rainfall in Tampa is about 34 inches and the annual average high humidity is around 87%#37;. Because of the high temperature and humidity, the CFRP-masonry bond was exposed to a particularly aggressive environment. Three types of thermal evaluation were carried out: thermocouple monitoring and both passive (solar) and active (localized heating) infrared thermal imaging. Twenty-four thermocouples were used to observe the spatial variations in temperature on the wall. Data showed that the surface temperatures of the wall are uneven with one end being hotter than the other. Measurements indicated that the wall temperatures went as high as 103°F during the week of data collection in late March and early April of 2012. In contrast, the highest ambient temperature over the same period was 92°F. The high temperature experienced by the wall is below the glass transition temperature for the epoxies, which ranges from 140°F to 180°F. A FLIR Tau 320 thermal imaging camera was used to identify localized de-bonding. Solar radiation heated the walls and the goal of thermal imaging was to detect hot spots which are indicative of de-bonding. Although this technique is ideal for exterior applications, initial attempts were unsuccessful. Once de-bonds were located by sounding, the camera was capable of confirming two hot spots on wall 2. A thermal scanner built by the university from a series of ten Omega OS137 thermal sensors was used to obtain more complete thermal images of the walls. This scanner had a heating element which supplied heat and allowed for active thermography. The scanner detected 16 hot spots not seen with the thermal camera. Ten of the twelve spots on wall 2 are concentrated on a region of the wall which experienced the highest daily changes in temperature, which indicates that higher thermal and environmental cycling has caused greater de-bond. Based on the number of hot spots found using both active and passive thermography the Tonen epoxy is performing better than the Henkel epoxy. In general, the bond has endured; however, there are a few localized areas that have de-bonded. Pull-off tests are recommended on walls 2 and 3. Five locations in regions suspected to have poor bond and five locations in regions suspected to have good bond are identified for each wall.
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Assaye, Abb. "Torsional Stiffness Calculation of CFRP Hybrid Chassis using Finite Element Method : Development of calculation methodology of Formula Student CFRP Chassis." Thesis, Karlstads universitet, Fakulteten för hälsa, natur- och teknikvetenskap (from 2013), 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:kau:diva-79065.

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Composite sandwich structures are being used in the automotive and aerospace industries at an increasing rate due to their high strength and stiffness per unit weight.  Many teams in the world’s largest engineering competition for students, Formula Student, have embraced these types of structures and are using them in their chassis with the intent of increasing the torsional stiffness per unit weight.   The Formula Student team at Karlstad University, Clear River Racing, has since 2017 successfully built three carbon fiber based sandwich structure chassis. A big challenge when designing this type of chassis is the lack of strategy regarding torsional stiffness simulations. Thus, the goal of this thesis project was to provide the organization with a set of accurate yet relatively simple methods of modelling and simulating the torsional stiffness of the chassis.   The first step in achieving the goal of the thesis was the implementation of simplifications to the material model. These simplifications were mainly targeted towards the aluminum honeycomb core. In order to cut computational times and reduce complexity, a continuum model with orthotropic material properties was used instead of the intricate cellular structure of the core. To validate the accuracy of this simplification, the in-plane elastic modulus of the core was simulated in the finite element software Abaqus. The stiffness obtained through simulations was 0.44 % larger than the theoretical value. The conclusion was therefore made that the orthotropic continuum model was an accurate and effective representation of the core.   Furthermore, simplifications regarding the adhesive film in the core-carbon fiber interfaces were made by using constraints in Abaqus instead of modelling the adhesive films as individual parts. To validate this simplification and the overall material model for the sandwich structure, a three-point bend test was simulated in Abaqus and conducted physically. The stiffness for the sandwich panel obtained through physical testing was 2.4 % larger than the simulated stiffness. The conclusion was made that the simplifications in the material modelling did not affect the accuracy in a significant way.   Finally, the torsional stiffness of the 2020 CFRP chassis was found to be 12409.75 Nm/degree.   In addition to evaluating previously mentioned simplifications, this thesis also serves as a comprehensive guide on how the modelling of the chassis and how the three-point bend test can take place in regards to boundary conditions, coordinate system assignments and layup definitions.
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Books on the topic "CFRP"

1

Klaus, Schulte. Fatigue damage development of various CFRP-laminates. Washington, D.C: National Aeronautics and Space Administration, 1988.

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Belarbi, Abdeldjelil, Mina Dawood, Prakash Poudel, Mahmoud Reda, Hamidreza Tahsiri, Bora Gencturk, Sami H. Rizkalla, and Henry G. Russell. Design of Concrete Bridge Beams Prestressed with CFRP Systems. Washington, D.C.: Transportation Research Board, 2019. http://dx.doi.org/10.17226/25582.

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Sissakis, Kyriakos. Strengthening concrete slabs for punching shear with CFRP laminates. Ottawa: National Library of Canada, 2002.

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Loken, David. Effect of fibre straightness on fatique of aligned continuous CFRP composites. Ottawa: National Library of Canada, 1990.

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Lee, Cathy. Accelerated corrosion and repair of reinforced concrete columns using CFRP sheets. Ottawa: National Library of Canada, 1998.

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Milman, Ioulia. CFRP wraps for corrosion repair of reinforced concrete columns and corrosion monitorng. Ottawa: National Library of Canada, 2001.

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Purba, Burt K. Reinforcement of circular concrete columns with carbon fiber reinforced polymer (CFRP) jackets. Halifax, N.S: Nova Scotia CAD/CAM Centre, 1998.

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Zin, Khazali Haji Mohd. Ultrasonic wave propagation in carbon fibre reinforced plastic (CFRP) by non-contact laser. [s.l.]: typescript, 1998.

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Lee, Luke S. Investigation of integrity and effectiveness of RC bridge deck rehabilitated with CFRP composites. La Jolla, Calif: Structural Systems Research Project, Dept. of Structural Engineering, University of California, San Diego, 2004.

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Pridmore, Anna B. Structural response of near surface mounted CFRP strengthened reinforced concrete bridge deck overhang. La Jolla, Calif: Structural Systems Research Project, Dept. of Structural Engineering, University of California, San Diego, 2008.

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Book chapters on the topic "CFRP"

1

Gooch, Jan W. "CFRP." In Encyclopedic Dictionary of Polymers, 131. New York, NY: Springer New York, 2011. http://dx.doi.org/10.1007/978-1-4419-6247-8_2175.

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Hong, Yihong. "Experimental Study of Reinforced Concrete Beams Strengthened with CFRP." In Lecture Notes in Civil Engineering, 103–8. Singapore: Springer Singapore, 2022. http://dx.doi.org/10.1007/978-981-19-1260-3_10.

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AbstractTo test the strengthening effect of CFRP sheets on reinforced concrete (RC) beams, an experimental study was performed on five RC beams to analyze the influence of the amount of CFRP sheets and the sustained load of RC beams on the strengthening effect. The results showed that CFRP sheets could significantly improve the bending bearing capacity of the beams. However, there was no linear relationship between the amount of CFRP sheets and the strengthening effect, and the load on the beams had a great impact on the rigidity of the beams in the yield stage.
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Fujita, Masami, Terumitsu Takahashi, Kazuhiro Kuzume, Tamon Ueda, and Akira Kobayashi. "Strengthening with Prestressed CFRP Strips of Box Girders on the Chofu Bridge, Japan." In Case Studies of Rehabilitation, Repair, Retrofitting, and Strengthening of Structures, 21–34. Zurich, Switzerland: International Association for Bridge and Structural Engineering (IABSE), 2010. http://dx.doi.org/10.2749/sed012.021.

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<p>Reinforced concrete (RC) box girders of the Chofu Bridge had been strengthened using tensioned carbon fibre reinforced polymer (CFRP) strip method. Before and after the CFRP application, on-site load tests of the bridge were conducted using a 45 t weight vehicle.</p>
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Tserpes, Konstantinos, Elli Moutsompegka, Mareike Schlag, Kai Brune, Christian Tornow, Ana Reguero Simón, and Romain Ecault. "Characterization of Pre-bond Contamination and Aging Effects for CFRP Bonded Joints Using Reference Laboratory Methods, Mechanical Tests, and Numerical Simulation." In Adhesive Bonding of Aircraft Composite Structures, 51–117. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-319-92810-4_2.

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AbstractIn this chapter, the pre-bond contamination and ageing effects on carbon fiber reinforced plastic (CFRP) adherends and CFRP bonded joints are characterized by means of reference laboratory non-destructive testing (NDT) methods, mechanical tests, and numerical simulation. Contaminations from two fields of application are considered, namely in aircraft manufacturing (i.e. production) and for in-service bonded repair. The production-related scenarios comprise release agent, moisture, and fingerprint, while the repair-related scenarios comprise fingerprint, thermal degradation, de-icing fluid, and a faulty curing of the adhesive. For each scenario, three different levels of contamination were pre-set and applied, namely low, medium and high level. Furthermore, two types of samples were tested, namely coupons and pilot samples (a stiffened panel and scarf repairs). The CFRP adherends were contaminated prior to bonding and the obtained surfaces were characterized using X-ray photoelectron spectroscopy. After bonding, the joints were tested by ultrasonic testing. To characterize the effects of each contamination on the strength of the bonded joints, mode-I and mode-II fracture toughness tests, and novel centrifuge tests were conducted on the coupons, while tensile tests were performed on the scarfed samples. Additionally, numerical simulation was performed on CFRP stiffened panels under compression using the LS-DYNA finite element (FE) platform.
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Adams, D. F. "CFRP Testing and Properties Optimization." In Carbon Fibres and Their Composites, 175–83. Berlin, Heidelberg: Springer Berlin Heidelberg, 1985. http://dx.doi.org/10.1007/978-3-642-70725-4_10.

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Crawford, Kenneth C. "Evaluating CFRP-Concrete Bond Performance." In 8th International Conference on Advanced Composite Materials in Bridges and Structures, 195–203. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-031-09632-7_23.

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Carboni, Michele, and Andrea Bernasconi. "Acoustic Emission Based Monitoring of Fatigue Damage in CFRP-CFRP Adhesive Bonded Joints." In Lecture Notes in Civil Engineering, 605–15. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-64594-6_59.

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Scheffers, Craig A., R. Sri Ravindrarajah, and Rhesa Reinaldy. "Bearing Strength of CFRP Confined Concrete." In Advances in FRP Composites in Civil Engineering, 603–6. Berlin, Heidelberg: Springer Berlin Heidelberg, 2011. http://dx.doi.org/10.1007/978-3-642-17487-2_131.

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Cirese, P., C. Folchitto, M. Marchetti, and M. Porzi. "Damage Propagation in Notched CFRP Laminates." In Durability of Polymer Based Composite Systems for Structural Applications, 280–97. Dordrecht: Springer Netherlands, 1991. http://dx.doi.org/10.1007/978-94-011-3856-7_21.

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Wu, D., R. Steegmüller, W. Karpen, and G. Busse. "Characterization of CFRP with Lockin Thermography." In Review of Progress in Quantitative Nondestructive Evaluation, 439–46. Boston, MA: Springer US, 1995. http://dx.doi.org/10.1007/978-1-4615-1987-4_52.

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Conference papers on the topic "CFRP"

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Sun, Jiayu, Kenta Yamanaka, Akihiko Chiba, Yuji Ichikawa, Hiroki Saito, and Kazuhiro Ogawa. "Cold Spray Sn Coating on the Carbon Fiber Reinforced Polymer." In ITSC2021, edited by F. Azarmi, X. Chen, J. Cizek, C. Cojocaru, B. Jodoin, H. Koivuluoto, Y. C. Lau, et al. ASM International, 2021. http://dx.doi.org/10.31399/asm.cp.itsc2021p0075.

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Abstract Because of their high specific strength; carbon fiber reinforced plastics (CFRPs) are widely used in the aerospace industry. Metallization of CFRP by cold spraying as a surface modification method can improve the low thermal resistance and electrical conductivity of CFRP without the need for high heat input. Herein; we cold spray a Sn coating on cured CFRP substrates and examine the Sn/epoxy interface. The results suggest that the Sn coatings are successfully obtained at a gas temperature of 473 K and indicate no severe damage to the CFRP substrates. The stress and plastic strain distributions at the cross-section of the Sn/CFRP interface when a Sn particle is impacted onto the CFRP substrate are obtained using the finite element method.
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Wang, Hui, Fuda Ning, Yingbin Hu, Yuanchen Li, Xinlin Wang, and Weilong Cong. "Edge Trimming of CFRP Composites Using Rotary Ultrasonic Machining: Effects of Ultrasonic Vibration." In ASME 2018 13th International Manufacturing Science and Engineering Conference. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/msec2018-6362.

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Carbon fiber reinforced plastic (CFRP) composites have many excellent properties, which make them be widely used in many applications. After demolding processes, CFRP composites still need additional machining processes to achieve final shape with desired tolerances. Edge trimming is the first machining process performed on composites after their molding processes. Because of carbon fibers’ abrasive properties as well as CFRPs’ properties of inhomogeneity and anisotropy, CFRPs are regarded as the difficult-to-cut materials. Many problems are generated in traditional machining processes. To reduce and solve the problems, edge trimming using rotary ultrasonic machining (RUM) is reported in this manuscript. This paper, for the first time, makes the comparisons on machining performance (cutting forces, torque, and surface roughness) between edge trimming processes with and without ultrasonic vibration assistance. To better understand effects of ultrasonic vibration on such a process, machining mechanisms are also obtained and analyzed. This paper will provide guides for RUM edge trimming of CFRP composites.
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KITAGAWA, YOUZOU, KOTARO HIRAIWA, MASAHIRO ARAI, AKINORI YOSHIMURA, and KEITZ GOTO. "PREDICTION OF NUMBER OF CYCLES FROM FATIGUE TEST CONDITIONS AND TRANSVERSE CRACK DENSITY OF CFRP CROSS-PLY LAMINATES." In Thirty-sixth Technical Conference. Destech Publications, Inc., 2021. http://dx.doi.org/10.12783/asc36/35918.

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In the present paper, we proposed a methodology that can predict the number of applied load cycles in tension-tension fatigue test of CFRP laminates from microscopic damages and test conditions. It is difficult to predict the fracture of CFRP laminates and to estimate the remaining life of CFRP laminates for ensuring the long-term reliability of the CFRP components because the fracture process of CFRP laminates is quite complex. The damage process of CFRP consists of various microscopic damage such as matrix cracks, fiber/matrix interfacial debondings, delamination and so on. In order to quantitatively estimate the remaining life of CFRPs, we focused on the degree of the microscopic damages and relate that to the remaining life of them. The tension-tension fatigue tests of CFRP cross-ply laminates were carried out, and we suspended the tests at arbitrary cycles. When the tests were suspended, we counted the number of transverse cracks occurred on the specimens by a replica method, and measured the stiffness degradation of the specimens. We formulated an equation that can predict the stiffness degradation using fatigue test conditions. The predicted stiffness degradation to the number of cycles using the formula agreed well with the experimental results. The result demonstrated that the formula can predict the number of subjected cycles from fatigue test conditions and transverse crack density.
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Che, Hanqing, Stephen Yue, and Phuong Vo. "Investigation of the Deposition Mechanism of Cold Spray onto Carbon Fibre Reinforced Polymers." In ITSC2015, edited by A. Agarwal, G. Bolelli, A. Concustell, Y. C. Lau, A. McDonald, F. L. Toma, E. Turunen, and C. A. Widener. ASM International, 2015. http://dx.doi.org/10.31399/asm.cp.itsc2015p0114.

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Abstract Carbon fibre reinforced polymers (CFRPs) are more and more used in a wide range of industries, especially in the aerospace industry, but their low electrical conductivity has limited their application. During the past few years, metallization of CFRP has attracted increasing interest. To make the polymer composites electrically conductive, a conductive media must be either embedded into or coated onto the composites. Cold spray is one coating approach to achieve this. In this work, metallic powders were cold sprayed onto the CFRPs used in aircraft by using two different cold spray systems. The coatings as well as the coating/substrate interfaces were characterized and the deposition mechanism onto the CFRP substrate was determined.
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BISWAS, PIAS KUMAR, MAYUR JADHAV, ASEL ANAND HABARAKADA LIYANAGE, HAMID DALIR, and MANGILAL AGARWAL. "MULTIFUNCTIONAL ENERGY STORAGE INTEGRATION INTO ELECTROSPUN EPOXY-CNT NANOFIBER ENHANCED CFRP COMPOSITE STRUCTURE." In Proceedings for the American Society for Composites-Thirty Seventh Technical Conference. Destech Publications, Inc., 2022. http://dx.doi.org/10.12783/asc37/36403.

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This work presents and assesses a structural integrity concept for a multifunctional carbon fiber reinforced composite with an embedded lithium-ion battery. In order to find a better packaging strategy for embedding lithium-ion batteries at its core, we compared adaptable composite structures made of traditional carbon fiber reinforced polymer (CFRPs), air-sprayed, and electrospun epoxy-multiwalled carbon nanotubes (epoxy-CNT) enhanced CFRPs. The electrospinning technique is well recognized across the world as a versatile and cost-effective way of producing continuous nanofilaments. It was precisely applied to the prepreg surface to provide efficient interfacial bonding and adhesion between the layers. The mechanical and physical characteristics of CFRPs reinforced with electrospun epoxy-carbon nanotubes have been demonstrated to be superior to those of conventional CFRP prepreg composites. Simultaneously, the air sprayed epoxy-carbon nanotube enhanced CFRP provides more mechanical strength than conventional CFRP prepreg but less than electrospun fiber-enhanced composites. The new multifunctional energy storage composite (MESC) might be a design factor in terms of economic feasibility. These components also help to the battery's structural load-bearing implementation and effective load transmission without damaging the battery's chemical composition. MESC design validation, manufacturing procedures, and experimental characterization (mechano-electrical) are all investigated in this paper. The electrochemical characterization findings demonstrate that the MESCs function similarly to ordinary lithium-ion pouch cells without any external packaging and under all loading circumstances. The mechanical strength and stiffness of the MESC cells, especially the electrospun epoxy-CNT enhanced MESC, are tested in three-point bending tests. The results show that the electrospun epoxy-CNT enhanced MESC has a lot more strength and stiffness than traditional pouch cells and air-sprayed CFRP at a lower weight and thickness. This mechanical robustness of the MESCs enables them to be manufactured as energy-storage devices for electric vehicles.
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Barry, John, and Zan Uffelman. "Process Speeds for Drilling and Reaming CFRP and CFRP/Metallic Stacks." In Aerospace Technology Conference and Exposition. 400 Commonwealth Drive, Warrendale, PA, United States: SAE International, 2011. http://dx.doi.org/10.4271/2011-01-2743.

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Santos, Bruno, Jónatas Valença, Filipe Dourado, and Eduardo Júlio. "Strain monitoring on pre-stressed CFRP laminates through computer vision." In IABSE Congress, New York, New York 2019: The Evolving Metropolis. Zurich, Switzerland: International Association for Bridge and Structural Engineering (IABSE), 2019. http://dx.doi.org/10.2749/newyork.2019.0493.

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<p>Strengthening reinforced concrete (RC) members with Carbon Fiber Reinforced Polymer (CFRP) solutions is currently a widespread technique. The success in increasing the strength and/or in controlling the deformation of structural members using CFRPs has been recognized worldwide, and most relevant aspects have been thoroughly studied and published. For large-span beams and slabs, the method is much more effective if pre- stressed CFRP laminates are adopted. Therefore, onsite measurements of the applied strain state, as well as of its evolution with time due to pre-stress losses, are mandatory to ensure a correct operation and to monitor the time-dependent behavior. Presently, the former is assessed only indirectly, through load control when pre-stress is applied, and the latter simply is not conducted since there is no budget to comply with.</p><p>In this paper a first step of a vision-based method to measure the strain level in CFRP laminates during the strengthening operations, as well as during periodic inspections later on, is presented. The method uses computer vision and was applied and validated in computational simulations. The results achieved allowed to establish the limits of validation of the algorithms developed and implemented. The contactless method proposed will represent a major added value for the already widespread technique of reinforcement of RC members with pre-stressed CFRP laminates.</p>
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Balázs, György L., and Adorján Borosnyói. "Prestressing with CFRP Tendons." In International Conference on High Performance Materials in Bridges. Reston, VA: American Society of Civil Engineers, 2003. http://dx.doi.org/10.1061/40691(2003)31.

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KAYNAN, OZGE, LISA PEREZ, and AMIR ASADI. "INTERFACIAL PROPERTIES OF HYBRID CELLULOSE NANOCRYSTAL/CARBONACEOUS NANOMATERIAL COMPOSITES." In Thirty-sixth Technical Conference. Destech Publications, Inc., 2021. http://dx.doi.org/10.12783/asc36/35922.

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Cellulose nanocrystal (CNCs) assisted carbon nanotubes (CNTs) and graphene nanoplatelets (GnP) were used to modify the interfacial region of carbon fiber (CF) and polymer matrix to strengthen the properties of carbon fiber-reinforced polymer (CFRP). Before transferring CNC-CNTs and CNC-GnPs on the CF surface by an immersion coating method, the nanomaterials were dispersed in DI water homogeneously by using probe sonication technique without additives. The results showed that the addition of CNC-CNT and CNC-GnP adjusted the interfacial chemistry of CFRP with the formation of polar groups. Furthermore, according to the single fiber fragmentation test (SFFT), the interfacial shear strength (IFSS) of CNC-GnP 6:1 and CNC-CNT 10:1 added CFRP increased to 55 MPa and 64 MPa due to modified interfacial chemistry by the incorporation of the nanomaterials. This processing technique also resulted in improvement in interlaminar shear strength (ILSS) in CFRPs from 35 MPa (neat composite) to 45 (CNC-GnP 6:1) MPa and 52 MPa (CNC-CNT 10:1).
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Beal, Aaron, Dave Dae-Wook Kim, Kyung-Hee Park, and Patrick Kwon. "A Comparative Study of Carbide Tools in Drilling of CFRP and CFRP-Ti Stacks." In ASME 2011 International Manufacturing Science and Engineering Conference. ASMEDC, 2011. http://dx.doi.org/10.1115/msec2011-50114.

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A comparative study was conducted to investigate drilling of a titanium (Ti) plate stacked on a carbon fiber reinforced plastic panel. The effects on tool wear and hole quality in drilling using micrograin tungsten carbide (WC) tools were analyzed. The experiments were designed to first drill CFRP alone to create 20 holes. Then CFRP-Ti stacks were drilled for the next 20 holes with the same drill bit. This process was repeated until drill failure. The drilling was done with tungsten carbide (WC) twist drills at two different speeds (high and low). The feed rate was kept the same for each test, but differs for each material drilled. A Scanning Electron Microscope (SEM), and a Confocal Laser Scanning Microscope (CLSM), were used for tool wear analysis. Hole size and profile, surface roughness, and Ti burrs were analyzed using a coordinate measuring system, profilometer, and an optical microscope with a digital measuring device. The experimental results indicate that the Ti drilling accelerated WC flank wear while CFRP drilling deteriorated the cutting edge. Entry delamination, hole diameter errors, and surface roughness of the CFRP plate became more pronounced during drilling of CFRP-Ti stacks, when compared with the results from CFRP only drilling. Damage to CFRP holes during CFRP-Ti stack drilling may be caused by Ti chips, Ti adhesion on the tool outer edge, and increased instability as the drill bits wear.
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Reports on the topic "CFRP"

1

Saeed, Yasir. Behavior of Prestressed Concrete Beams with CFRP Strands. Portland State University Library, January 2000. http://dx.doi.org/10.15760/etd.2722.

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Rafeeq, Ranj. Torsional Strengthening of Reinforced Concrete Beams Using CFRP Composites. Portland State University Library, January 2000. http://dx.doi.org/10.15760/etd.3121.

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Todoroki, Akira. Impact Damage Detection of Toughened CFRP Laminates with Time Domain Reflectometry. Fort Belvoir, VA: Defense Technical Information Center, January 2013. http://dx.doi.org/10.21236/ada571181.

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Al-Khafaji, Hayder. Experimental Investigation of CFRP Wrapped Square Non-ductile Reinforced Concrete Columns. Portland State University Library, January 2000. http://dx.doi.org/10.15760/etd.5265.

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Carlson, Blair E., David Ollett, and Sarah Kleinbaum. Friction Stir Scribe Joining of Carbon Fiber Reinforced Polymer (CFRP) to Aluminum. Office of Scientific and Technical Information (OSTI), February 2018. http://dx.doi.org/10.2172/1464600.

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BOEING CO SEATTLE WA. STARS Conceptual Framework for Reuse Processes (CFRP). Volume 2: application Version 1.0. Fort Belvoir, VA: Defense Technical Information Center, September 1993. http://dx.doi.org/10.21236/ada284597.

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7

Al-Obaidi, Salam. Behavior of Reinforced Concrete Beams Retrofitted in Flexure Using CFRP-NSM Technique. Portland State University Library, January 2000. http://dx.doi.org/10.15760/etd.2291.

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Zerkane, Ali. Cyclic Loading Behavior of CFRP-Wrapped Non-Ductile Reinforced Concrete Beam-Column Joints. Portland State University Library, January 2000. http://dx.doi.org/10.15760/etd.3001.

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Aules, Wisam. Behavior of Non-Ductile Slender Reinforced Concrete Columns Retrofit by CFRP under Cyclic Loading. Portland State University Library, January 2000. http://dx.doi.org/10.15760/etd.6688.

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Matt, Howard M. Structural Diagnostics of CFRP Composite Aircraft Components by Ultrasonic Guided Waves and Built-In Piezoelectric Transducers. Office of Scientific and Technical Information (OSTI), January 2006. http://dx.doi.org/10.2172/899976.

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