Bibliografie tematiche / Glass fibre reinforced polyester (GFRP)

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Letteratura scientifica selezionata sul tema "Glass fibre reinforced polyester (GFRP)"

Autore: Grafiati

Pubblicato: 25 gennaio 2025

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Articoli di riviste sul tema "Glass fibre reinforced polyester (GFRP)"

Alotaibi, Jasem Ghanem, Ayedh Eid Alajmi, Gabrel A. Mehoub e Belal F. Yousif. "Epoxy and Polyester Composites’ Characteristics under Tribological Loading Conditions". Polymers 13, n. 14 (7 luglio 2021): 2230. http://dx.doi.org/10.3390/polym13142230.

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This research examines the friction and dry wear behaviours of glass fibre-reinforced epoxy (GFRE) and glass fibre-reinforced polyester (GFRP) composites. Three fibre orientations—parallel orientation (P–O), anti-parallel orientation (AP–O), and normal orientation (N–O)—and various sliding distances from 0–15 km were examined. The experiments were carried out using a block-on-ring configuration at room temperature, an applied load of 30 N, and a sliding velocity of 2.8 m/s. During the sliding, interface temperatures and frictional forces were captured and recorded. Worn surfaces were examined using scanning electron microscopy to identify the damage. The highest wear rates for GFRE composites occurred in those with AP–O fibres, while the highest wear rates for GFRP composites occurred in those with P–O fibres. At longer sliding distances, composites with P–O and N–O fibres had the lowest wear rates. The highest friction coefficient was observed for composites with N–O and P–O fibres at higher sliding speeds. The lowest friction coefficient value (0.25) was for composites with AP–O fibres. GFRP composites with P–O fibres had a higher wear rate than those with N–O fibres at the maximum speed.

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Natarajan, Velmurugan, Ravi Samraj, Jayabalakrishnan Duraivelu e Prabhu Paulraj. "Experimental Investigation on Mechanical Properties of A/GFRP, B/GFRP and AB/GFRP Polymer Composites". Materiale Plastice 58, n. 4 (4 gennaio 2022): 28–36. http://dx.doi.org/10.37358/mp.21.4.5528.

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This study aims to reveal the consequence of thickness reinforcement on Fiber Laminates (Polyester Resin, Glass Fiber, Aluminum, and Bentonite) and to see if it can enhance the mechanical properties and resistance of laminates. Glass fiber reinforced polymer composites have recently been used in automotive, aerospace, and structural applications where they will be safe for the application s unique shape. Hand layup was used to fabricate three different combinations, including Aluminium /Glass fiber reinforced polyester composites (A/GFRP), Bentonite/Glass fiber reinforced polyester composites (B/GFRP), and Aluminium&Bentonie/Glass fiber reinforced polyester composites (AB/GFRP). Results revealed that AB/GFRP had better tensile strength, flexural strength, and hardness than GFRP and A/GFRP. Under normal atmospheric conditions and after exposure to boiling water, hybrid Aluminium&Bentonite and glass fiber-reinforced nanocomposites have improved mechanical properties than other hybrid composites. After exposure to temperature, the flexural strength, tensile strength and stiffness of AB/GFRP Composites are 40 % higher than A/GFRP and 17.44% higher than B/GFRP Composites.

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Ramnath, B. Vijaya, S. Rajesh, Chinnadurai Elanchezhian, V. Vignesh, V. Vijai Rahul, V. Tamilselvan e S. U. Sathya Narayanan. "Investigation of Mechanical Behaviour of Glass Fibre Based SiC Polymer Composites". Applied Mechanics and Materials 591 (luglio 2014): 142–45. http://dx.doi.org/10.4028/www.scientific.net/amm.591.142.

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Silicon Carbide/GFRP reinforced matrix composite and SiC matrix composite has been developed by using hand layup and resin casting methods respectively. The GFRP reinforced polymer composite is made by sandwiching two layers of GFRP in between the SiC material. The resin used for the preparation the samples are epoxy and polyester, for both Sic/GFRP composite and SiC composite. An Arcan fixture with butterfly specimen is used to measure the fracture occurring in various modes of the polymer composite. The objective of the proposed testing method is to determine the variation in the stress value depending on the resin material as well as the influence of GFRP in the strength of SiC polymer composite. Results from the tests are analyzed to show that the polyester resin is better for shear strength, in both Sic/GFRP reinforced and SiC composite material.

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Manasa, A. C., S. M. Basutkar, K. Madhavi, M. S. Amalkar, M. V. Renuka Devi e K. S. Jagadish. "Compressive Strength of Brick Masonry Confined with Glass Fibre Reinforced Polymer". ECS Transactions 107, n. 1 (24 aprile 2022): 19279–87. http://dx.doi.org/10.1149/10701.19279ecst.

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Compressive strength is one of the key factors influencing behavior of brick masonry. Various traditional techniques can be used to increase the strength, stiffness, and ductility of unreinforced brick masonry. However, considerable mass and thickness will be added to the original structural element as a result of with both aesthetics and economy will be affected. In this study, behavior of brick masonry prisms confined with glass fibre reinforced polymer (GFRP) has been investigated. Various patterns of wrapping were adopted using polyester resin. Maximum Compressive strength and ultimate strain of GFRP confined prisms were compared with unreinforced prisms. Results obtained show a substantial increase in compressive strength of prisms when confined with GFRP-polyester and GFRP-epoxy.

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Anbusagar, N. R. R., K. Palanikumar, R. Vigneswaran, M. Rajmohan e P. Sengottuvel. "Tensile and Flexural Properties of Glass Fibre Reinforced Nano Polymer Composite Panels". Applied Mechanics and Materials 766-767 (giugno 2015): 372–76. http://dx.doi.org/10.4028/www.scientific.net/amm.766-767.372.

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This paper investigates the effect of nanoclay content on glass fibre reinforced polymer (GFRP) composites under tensile and flexural loading. Four different combinations of GFRP composite panels made of fiber glass/nanomodified polyester resin have been prepared by hand lay-up manufacturing technique (HL). Composite samples are tested for tensile and flexural properties. Scanning Electron Microscopy (SEM) has given morphological picture of the FRP fracture samples. The results showed that the tensile and flexural strength is greatly increased over the range of nanoclay loading by about 23% and 40% respectively.

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Zaghloul, Mahmoud Yousry, Moustafa Mahmoud Yousry Zaghloul e Mai Mahmoud Yousry Zaghloul. "Influence of Stress Level and Fibre Volume Fraction on Fatigue Performance of Glass Fibre-Reinforced Polyester Composites". Polymers 14, n. 13 (29 giugno 2022): 2662. http://dx.doi.org/10.3390/polym14132662.

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Fibre-reinforced polymeric composite materials are becoming substantial and convenient materials in the repair and replacement of traditional metallic materials due to their high stiffness. The composites undergo different types of fatigue loads during their service life. The drive to enhance the design methodologies and predictive models of fibre-reinforced polymeric composite materials subjected to fatigue stresses is reliant on more precise and reliable techniques for assessing their fatigue life. The influences of fibre volume fraction and stress level on the fatigue performance of glass fibre-reinforced polyester (GFRP) composite materials have been studied in the tension–tension fatigue scenario. The fibre volume fractions for this investigation were set to: 20%, 35%, and 50%. The tensile testing of specimens was performed using a universal testing machine and the Young’s modulus was validated with four different prediction models. In order to identify the modes of failure as well as the fatigue life of composites, polyester-based GFRP specimens were evaluated at five stress levels which were 75%, 65%, 50%, 40%, and 25% of the maximum tensile stress until either a fracture occurred or five million fatigue cycles was reached. The experimental results showed that glass fibre-reinforced polyester samples had a pure tension failure at high applied stress levels, while at low stress levels the failure mode was governed by stress levels. Finally, the experimental results of GFRP composite samples with different volume fractions were utilized for model validation and comparison, which showed that the proposed framework yields acceptable correlations of predicted fatigue lives in tension–tension fatigue regimes with experimental ones.

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Izzuddin, Amir, e Ibrisam Akbar. "Effect of Flexural Static Load on the Strength of GFRP Gratings". Applied Mechanics and Materials 567 (giugno 2014): 387–92. http://dx.doi.org/10.4028/www.scientific.net/amm.567.387.

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– The usage of steel in offshore deep water area contributes to the massive load of the offshore platform which will lead to the massive operational cost. Therefore, the reduction of weight of platform is the major issue that need to be tackled properly. The great improvement in strength to weight ratio compare to steel and high resistivity to corrosion makes Glass Fibre Reinforced Polymer (GFRP) grating preferable. GFRP gratings are normally made of two types of processes which are moulded and pultruded and it is usually consists of glass fibre and bonding matrixes of vinyl ester (VE), polyester (PE), or phenolic (PHE). However there is still doubt on GFRP grating application for offshore due to no consensus guidelines for the design of GFRP grating and there are many several types of GFRP grating available to be chosen. This paper presenting the study on two types of GFRP grating strength with variation of bonding matrixes under flexural static load. A total of six specimens of GFRP grating which consist of 1 each of molded vinyl ester, molded polyester, molded phenolic, pultruded vinyl ester, pultruded polyester and pultruded phenolic were tested to failure in flexure. The main parameters concerns in this study are 1) max load vs. mid-span deflection and 2) failure mode of the specimens.

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Huang, Jing, Zhuo Bin Wei e Yi Gao. "Application Research on the New GFRP Members Based Modified Behavior Used in Building". Key Engineering Materials 517 (giugno 2012): 910–14. http://dx.doi.org/10.4028/www.scientific.net/kem.517.910.

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Glass fiber reinforced plastics (GFRP) is an immensely versatile material which combines lightweight with inherent strength. For the properties of sustainability, energy efficiency and reduction of CO2 of GFRP, they can be used in green building as a kind of the energy-efficient and environment-friendly material instead of the conventional materials. Based on the less elastic modulus and lower wave-transparent properties of glass fiber reinforced plastics for unsaturated polyester resin (UPR-FRP), a new kind of glass fiber reinforced plastics based modified unsaturated polyester (MUPR-FRP) was put forward. This paper presents material behavior and technical process of the new MUPR-FRP. For the modified property, the MUPR-FRP members may have the well superiority compare with the steel and the concrete materials used in strengthening engineering and special loading resistance.

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Baba, Nor Bahiyah, Ahmad Syakirin Suhaimi, Muhamad Asyraf Mohd Amin e Alias Mohd. "Study on Mechanical and Physical Behaviour of Hybrid GFRP". Advances in Materials Science and Engineering 2015 (2015): 1–7. http://dx.doi.org/10.1155/2015/138965.

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The paper discusses the mechanical and physical behaviour of hybrid glass fibre reinforced plastic (GFRP). Hybrid GFRP was fabricated by three different types of glass fibre, namely, 3D, woven, and chopped, which were selected and combined with mixture of polyester resin and hardener. The hybrid GFRP was investigated by varying three parameters which were the composite volume fractions, hybrid GFRP arrangement, and single type fibre. The hybrid GFRP was fabricated by using open mould hand lay-up technique. Mechanical testing was conducted by tensile test for strength and stiffness whereas physical testing was performed using water absorption and hardness. These tests were carried out to determine the effect of mechanical and physical behaviour over the hybrid GFRP. The highest volume fraction of 0.5 gives the highest strength and stiffness of 73 MPa and 821 MPa, respectively. Varying hybrid fibre arrangement which is the arrangement of chopped-woven-3D-woven-chopped showed the best value in strength of 66.2 MPa. The stiffness is best at arrangement of woven-chopped-woven-chopped-woven at 690 MPa. This arrangement also showed the lowest water absorption of 4.5%. Comparing the single fibre type, woven had overtaken the others in terms of both mechanical and physical properties.

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Boumehraz, Mohammed-Amin, Kamel Goudjil, Mekki Mellas, Achref Hamaidia, Farida Boucetta e Brahim Baali. "Mechanical behavior of glass fiber-reinforced polyester in a humid environment". STUDIES IN ENGINEERING AND EXACT SCIENCES 5, n. 2 (31 luglio 2024): e6274. http://dx.doi.org/10.54021/seesv5n2-066.

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Glass fiber composite materials have been well known in certain maritime applications for a long time, being used in several applications in different fields. The characteristics of Glass fiber-reinforced Polyester (GFRP) depend on the contained fibers, the matrix used, and the fiber-to-total volume ratio. GFRP is a polymer material used in various fields; it is generally preferred for its ease of installation and its very long lifespan, even in the presence of aggressive fluids. The aim of this research is to study the evolution of mechanical properties (tensile strength and flexural strength) of GFRP preserved in different environments such as open air (control), drinking water, and seawater (harsh environment). Additionally, tests on GFRP are conducted through chemical characterization studies or SEM observation of the resin. Lastly, GFRP is considered to be chemically stable for a conservation period of one year in seawater. Finally, despite the conservation of GFRP for a year in a humid and sulphate environment, we note that the connection between the fibers and the matrix is in good condition, or the conservation environment has no influence on the GFRP composite.

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Più fonti

Tesi sul tema "Glass fibre reinforced polyester (GFRP)"

Aoujdad, Khalid. "Caractérisatiοns ultrasοnοres du vieillissement de pales d’hydroliennes et d’éoliennes en milieu marin. : Cοnfrοntatiοn aux essais mécaniques". Electronic Thesis or Diss., Normandie, 2024. http://www.theses.fr/2024NORMLH24.

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Cette thèse porte sur la caractérisation non destructive par ondes ultrasonores des échantillons représentatifs des pales d’éoliennes offshore, avec confrontation aux tests mécaniques. Les échantillons sont en matériaux composites à base de la résine polyester renforcée par des fibres de verre UD GFRP (Unidirectional Glass Fibers Reinforced Polyester). Ils sont soumis à un vieillissement accéléré dans l’eau de mer chauffée à 40 °C et à 60 °C, afin de simuler le milieu marin et réduire la durée d’étude. L’objectif est de trouver des paramètres acoustiques sensibles au vieillissement permettant d’évaluer l’effet du vieillissement ou de le quantifier. L’analyse par ondes guidées de Lamb a montré une diminution des vitesses de phase des modes et de la vitesse de Rayleigh, ainsi que l’augmentation de l’atténuation dans le matériau, ce qui indique que les propriétés mécaniques des matériaux se dégradent à cause du vieillissement. L’imagerie C-scan montre une dégradation de la résine, entraînant la réorganisation des fibres et la modification de leur alignement. Une modélisation numérique par la méthode des éléments finis de la propagation des ondes guidées dans ces matériaux a montré que les propriétés structurelles et géométriques des matériaux se dégradent à cause du vieillissement. Les paramètres les plus attaquées sont les constantes d’élasticité, ainsi que la masse volumique pour des vieillissement plus forts et plus longs. Enfin, le nombre des plis des renforts dans un échantillons joue un rôle important dans sa résistance au vieillissement
This thesis discusses the ultrasonic non-destructive characterization of representative samples of offshore wind turbine blades. The samples are made of composite materials based on Unidirectional Glass Fibers Reinforced Polyester (UD GFRP). Samples are subjected to accelerated aging in heated seawater at 40°C and 60°C, in order to simulate the marine environment and reduce study times. The aim is to find acoustic parameters sensitive to aging, enabling the effect of aging to be assessed or quantified. Lamb's guided wave analysis showed a decrease in mode phase velocities and Rayleigh velocity, as well as an increase in attenuation in the material, indicating that the mechanical properties of the material are degrading due to aging. C-scan imaging shows degradation of the resin, leading to reorganization of the fibers and changes in their alignment. Finite element numerical modelling of guided wave propagation in these materials has shown that the structural and geometric properties of the materials degrade with age. The parameters most affected are the elasticity constants, as well as the density for stronger and longer aging. Finally, the number of reinforcement plies in a sample plays an important role in its resistance to aging

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White, Roger John. "Environmental creep mechanisms in glass/polyester composites". Thesis, University of Bath, 1985. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.353403.

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A previous study, looking at the creep-rupture behaviour of mixed reinforcement GRP when immersed in water, had discovered that low loads, behaviour became temperature sensitive. Since the recorded time to failure of a sample was reduced at elevated temperatures, from that predicted by a linear extrapolation of the short term creep-rupture results, this deviation caused problems in the accurate prediction of long-term design stresses. In order to improve the accuracy of long term design predictions, it was decided to study the mechanisms of creep in GRP that initiates time dependent failure. From this, it was hoped that accurate design criteria suitable for predicting GRP response over a 30 year design life from short term creep tests, could be developed. This thesis reports the results obtained from such a study. A series of creep tests were performed on mixed reinforcement GRP samples at several stress levels, both in air, and in room temperature distilled water, using a microcomputer based data collection system. In conjunction with this work, damage development in samples, due to combinations of water uptake and creep loading, was followed, using both scanning electron, and optical, microscopy. Moisture uptake measurements were undertaken under a series of load/temperature regimes, and fibre/matrix debonding followed using photographic techniques. In this way, water absorption, both in terms of uptake rate, and location within a sample, could be characterised. Tensile tests were also performed to determine the standard mechanical properties of the mixed reinforcement GRP used. It was found that a critical damage state was created at loads in excess of 50% of ultimate, but not below. This took the form of between 2 and 8 neighbouring filament breaks in the longitudinal woven rovings at weave crossover points, producing microcracks in the reinforcement. The creation of this multifilament fracture damage during primary creep, was considered to be necessary for time dependent failure to occur in air. Secondary greep strain was found to increase in discrete steps, both in air and water. This was attributed to the formation of transverse grasks in the longitudinal woven rovings, propogating from the above critical damage. In water, diffusion was found to be non-Fickian. Moisture uptake increased with increases in applied load and temperature. Water was seen to accumulate at weave cross-over points when immersed under load. This led to stress-enhanced fibre corrosion in these regions, weakening the reinforcement, and reducing the failure time from that expected at the same load level in air. The localised nature of moisture degradation was thought to result in the formation of critical fibre damage at loads below 50% of ultimate, when immersed in water. Two design criteria based on the observed creep mechanisms, have been developed for GRP that predict response when loaded in either air, or water. Both predict the existence of creep-rupture limits at low loads.

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Jaffry, Syed Ali Debaj. "Concrete filled glass fibre reinforced polymer (GFRP) shells under concentric compression". Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2001. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp04/MQ58768.pdf.

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Adediran, Oluseun. "Damage assessment of GFRP (glass fibre reinforced polymer) composite beam using vibration data". Thesis, University of Surrey, 2012. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.590654.

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Due to increase in the application of glass fibre reinforced polymer (GFRP) beams based structural systems for rehabilitation of existing and construction of new bridges there is a requirement for identification of critical components of these structural systems and the assessment of damage in this sort structural. The application of vibration-based damage detection (VBDD) techniques has been identified as one of the universal technique that is promising in damage assessment in composite beams. The current study aimed at using vibration-based damage detection technique for assessment of damage exhibited by FRP composite beam structure. This thesis addresses the experimental and numerical study of damage assessment of FRP composite beams using vibration data. Dynamic measurements were carried out considering different specified boundary conditions and the effect of supports on the modal parameters and the effect of damage would be obtained. Another set of experiments were conducted on a Fixed-Free beam with unspecified boundary conditions at the free end, where a mass and a spring attached to the free end and beams were tested for different damage scenarios. Triaxial accelerometers were placed at selected locations based on the result of simple FE beam model. The beams were excited in the two (vertical and horizontal) directions by means of a hammer but only the vertical direction was taken into consideration at this point. The responses at different points along the beam were recorded at different levels of damage and fed into an FIT analyzer. Post-processing of data was done with the stochastic subspace identification (SSI) technique. The effect of the damage on the natural frequencies, mode shapes, and damping ratio were determined. Finite element models for the intact, reference and damaged beams were constructed and used to support the dynamic measurements. FE model updating was applied to different five boundary conditions in order to evaiuate their effect. Damage assessment techniques based on selected methods such as modal frequency change, direct mode shapes, change in modal curvature, damage index method and model updating methods were developed and applied to the beams. A unique test configuration was introduced by combining fixed-free beam with undefmed boundary at the free end. The spring and masses were attached to the free-end, this was implemented for different damage scenarios. The outcome of this implement experiment was discussed and analysed.

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Worner, Victoria Jane. "Use of Glass Fibre Reinforced Polymer (GFRP) reinforcing bars for concrete bridge decks". Thesis, University of Canterbury. Civil & Natural Resources, 2015. http://hdl.handle.net/10092/10724.

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Glass Fibre Reinforced Polymer (GFRP) bars have been developed as an alternative to steel reinforcement for various structural concrete applications. Due to their non-corrossive nature, they are particularly suited for harsh environments where steel reinforcement is prone to corrosion. The purpose of this research is to determine the feasibility of GFRP reinforcing bars as concrete bridge deck reinforcement for locations, such as coastal New Zealand, where the non-corrosive benefits of GFRP may offer an alternative to traditional mild steel reinforcement. GFRP use as structural reinforcement may offer life-cycle cost benefits for certain structures as maintenance to repair corroded reinforcement is not necessary. The use of GFRP reinforcement in a New Zealand design context was investigated to directly compare the structural performance of this alternative reinforcing product. Mateen-bar, manufactured by Pultron Composites Ltd, is the GFRP reinforcing bar used in the experimental tests. Experimental investigation of tensile properties of GFRP bar samples was carried out to understand the mechanical behaviour of GFRP reinforcement and validate the manufacturer’s specifications. This series of tests highlighted the complexities of carrying out tensile testing of FRP products, due to the inability to grip the GFRP directly in a testing machine without crushing the specimen. Two phases of full-scale tests were carried out to compare the performance of bridge deck slabs reinforced with typical mild steel and GFRP reinforcing bar. This experimental testing was different to most existing research on GFRP reinforced slab performance as it did not compare the performance of a GFRP reinforcing bar area equivalent to steel, but was designed in such a way as to dependably give the same moment capacity of the steel reinforced slab design. This incorporated the recommended limit of 20% of design stress given by the manufacturer which led to an apparent over-reinforced section for the GFRP slab design. The aim of the experiments was to investigate the comparative performance of a typical New Zealand bridge deck design and a GFRP reinforced equivalent designed in such a way as is currently recommended by the manufacturer. The over-reinforcement lead to differences in conclusions drawn by other authors who have studied GFRP reinforced slab behaviour. Both flexural and concentrated loading (simulating vehicle loading) tests were carried out on both the steel and GFRP reinforced slab designs. Due to over-reinforcement the GFRP slab was considerably stiffer and stronger than the steel design, indicating that serviceability issues are unlikely to be as much of a design issue as existing literature would suggest. Deflection prediction models generally underestimate the strength of over-reinforced sections. All slabs failed in punching shear under concentrated loads, indicating that punching shear may be a critical failure mechanism for GFRP reinforced slabs Based on the findings from the extensive experimental phases, a set of design recommendations were made to further improve the potential for GFRP to be used for bridge deck design in a New Zealand context.

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Saleh, Najia M. "Bond of glass fibre reinforced polymer bars in high strength concrete". Thesis, University of Bradford, 2018. http://hdl.handle.net/10454/17361.

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Very limited research studies have been conducted to examine bond of glass fibre reinforced polymer (GFRP) bars with high concrete strength. The current research project aims to compare between bond measured from a pull-out test and a hinged beam test for GFRP bars embedded in high strength concrete. Different parameters influencing bond such as GFRP bar diameter, embedment length and surface configuration were investigated in both test methods, while the bar position, i.e. top or bottom, was only studied in hinged beams. Seventy-two pull-out cubes, eight pull-out prisms and twenty-four hinged beams reinforced with GFRP bars were constructed and tested to failure. Twelve pull-out cubes and four hinged beams reinforced with steel bars were also tested for comparison purposes. The results showed that bond stress – slip curves obtained from various testing methods were similar, consisting of high initial stiffness, followed by nonlinear ascending and softening branches. In addition, it was found that the experimental bond strength obtained from hinged beams was higher than both bond strengths measured by the pull-out cube and pull-out prism. However, when a finite element analysis was conducted for hinged beams, it was shown that the tensile force in the reinforcing bar estimated by equilibrium conditions is overestimated as the large deformation of hinged beams at failure was not considered. Therefore, if the tensile force obtained from the finite element analysis is used to calculate the bond strength, it would be similar to that obtained from pull-out cube and prism. Moreover, it was found that the distribution of tensile and bond stresses was nonlinear along the GFRP embedment length and bond stress at the vicinity of the free end increased with increasing the load due to redistribution of bond stresses along the embedment length. Bond strengths were compared against the prediction methods provided in ACI-440.1R, CSA-S806, CSA-S6 and JSCE 1997. In general, all design codes showed conservative results for all specimens tested and ACI predictions gave a good agreement with experimental data compared to other codes. Artificial neural network models were developed to predict bond strength of GFRP bars in concrete. These models used bar diameter, embedment length, concrete compressive strength and concrete cover as input variables. The developed ANN models showed to be able to predict bond strength of GFRP bars in concrete and, therefore, were used to conduct a parametric study.
Higher Education Institute, Government of Libya

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Saleh, N., Ashraf F. Ashour e Therese Sheehan. "Bond between glass fibre reinforced polymer bars and high - strength concrete". ElSevier, 2019. http://hdl.handle.net/10454/17246.

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Yes
In this study, bond properties of glass fibre reinforced polymer (GFRP) bars embedded in high-strength concrete (HSC) were experimentally investigated using a pull-out test. The experimental program consisted of testing 84 pull-out specimens prepared according to ACI 440.3R-12 standard. The testing of the specimens was carried out considering bar diameter (9.5, 12.7 and 15.9 mm), embedment length (2.5, 5, 7.5 and 10 times bar diameter) and surface configuration (helical wrapping with slight sand coating (HW-SC) and sand coating (SC)) as the main parameters. Twelve pull-out specimens reinforced with 16 mm steel bar were also tested for comparison purposes. Most of the specimens failed by a pull-out mode. Visual inspection of the tested specimens reinforced with GFRP (HW-SC) bars showed that the pull-out failure was due to the damage of outer bar surface, whilst the detachment of the sand coating was responsible for the bond failure of GFRP (SC) reinforced specimens. The bond stress – slip behaviour of GFRP (HW-SC) bars is different from that of GFRP (SC) bars and it was also found that GFRP (SC) bars gave a better bond performance than GFRP (HW-SC) bars. It was observed that the reduction rate of bond strength of both GFRP types with increasing the bar diameter and the embedment length was reduced in the case of high-strength concrete. Bond strength predictions obtained from ACI-440.1R, CSAeS806, CSA-S6 and JSCE design codes were compared with the experimental results. Overall, all design guidelines were conservative in predicting bond strength of both GFRP bars in HSC and ACI predictions were closer to the tested results than other codes.

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Errajhi, Osama Ali Zorgani. "Mechanical and physical properties of aluminised E-glass fibre reinforced unsaturated polyester composites". Thesis, University of Portsmouth, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.419044.

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Lamberti, Marco. "Innovative GFRP sections shape and proportions in civil engineering structures". Doctoral thesis, Universita degli studi di Salerno, 2016. http://hdl.handle.net/10556/2349.

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2014 - 2015
Although traditional materials (steel, concrete, timber and masonry) still dominate the building industry, new materials are constantly being explored by engineers and scientists. For instance, the use of the so-called FRPs (Fibre-Reinforced Polymers) is gradually spreading worldwide [1-4]. The main idea of FRPs is the combination, on a macroscopic scale, of two different long continuous fibres and a polymeric resin. More specifically, high strength fibres (glass, carbon, aramid or ultra-thin steel wires) provide strength and stiffness while the resin (polyester, vinylester or epoxy) protects the fibres and guarantees the stress transfer between them. As a result, enhanced final properties are obtained with respect to those exhibited by the individual constituents. Among several type of fibers, Glass Fibre Reinforced Polymers (GFRP) are widely used due to their relatively low cost, although glass fibres exhibit much lower elastic modulus and ultimate strength than carbon fibres. In addition, some additional issues emerge with regard to durability in alkaline environments and long-term response under sustained stresses. FRP pultruded beams take advantage of their principal features [5-6]. Since the late 1990s, among the FRPs elements, those frequently used in civil engineering are the pultruded ones. They are obtained by the pultrusion process that make possible to produce such profiles with both closed or open cross sections; the only limitation is that the same cross section is required over the length. Pultruded profiles reinforced with glass fibers (GFRP) present many advantages, including very high stiffness and strength to weight ratios, magnetic transparency, corrosion resistance, and an effective manufacturing process. For these features they can be qualified as non-corrosive, high mechanical strength and lightweight materials. In the last few years, they have been used in several different civil structures, acquiring a relevant role as primary bearing structural elements for applications such as cables, stands, truss members, footbridges, boardwalks, high voltage electricity poles, small buildings and emergency-oriented solutions...[edited by Author]
XIV n.s.

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Griffiths, Robert. "Characterisation and refinement of properties of glass fibre reinforced polyester polymer concrete for use in manhole components". Master's thesis, University of Cape Town, 1999. http://hdl.handle.net/11427/19803.

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The aim of this investigation is to characterise and refine the physical properties of glass fibre reinforced polyester polymer concrete. This material is currently being employed by AV Mouldings (Pty) Ltd. to manufacture manhole and drain components according to specifications existing for cast iron covers. No specification exists for polymer concrete. In particular it has been found that there is a large market for Type 2A replacement manhole covers and frames due to the current problem in South Africa of the cast iron versions being stolen and sold for scrap metal. It has been found that polymer concrete covers manufactured to replace stolen cast iron covers (in existing cast iron frames) fail occasionally in service. The investigation thus focuses on the characterisation of glass fibre reinforced polymer concrete and analysis of the current standards with a view to establishing a new South African Bureau of Standards (SABS) specification for polymer concrete manhole components. The main testing procedure involved flexural testing of beam specimens. Preliminary tests were carried out to measure strength, toughness, strain rate sensitivity, and the effect of different reinforcing materials. Accelerated degradation tests were then conducted to establish the materials resistance to UV radiation, acids, alkalis, and various solvents. Different resins were evaluated, and experiments were conducted using graded aggregates, in an attempt to reduce the number of voids in the material. Vibratory moulding techniques and postcuring methods were also evaluated. The viability of employing silane coupling agents in polymer concrete was investigated in detail towards the end of the research. Redesign of the Type 2A replacement cover was then undertaken.

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Libri sul tema "Glass fibre reinforced polyester (GFRP)"

Jaffry, Syed Ali Debaj. Concrete filled glass fibre reinforced polymer (GFRP) shells under concentric compression. Ottawa: National Library of Canada, 2001.

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Busschen, Albert Ten. Micromechanical Modelling of the Transverse Strenghts of Unidrectional Glass Fibre Reinforced Polyester. Delft Univ Pr, 1996.

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Capitoli di libri sul tema "Glass fibre reinforced polyester (GFRP)"

Thompson, S. J., R. T. Hartshorn e J. Summerscales. "Strain Gauges on Glass Fibre Reinforced Polyester Laminates". In Composite Structures 3, 748–59. Dordrecht: Springer Netherlands, 1985. http://dx.doi.org/10.1007/978-94-009-4952-2_53.

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Ghorbel, I., D. Valentin, M. C. Yriex e J. Grattier. "Damage Propagation Law in Glass Fibre Reinforced Polyester Tubes Under Hygrothermal Loading Conditions". In Durability of Polymer Based Composite Systems for Structural Applications, 374–84. Dordrecht: Springer Netherlands, 1991. http://dx.doi.org/10.1007/978-94-011-3856-7_29.

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As’ari, Muhammad Fareq Ikhwan, Alif Zulfakar Pokaad e Logah Perumal. "Crashworthiness Characteristic of Glass Fibre Reinforced Polymer (GFRP) Composite Tubes Under Quasi Static Loading". In Proceedings of the Multimedia University Engineering Conference (MECON 2022), 82–96. Dordrecht: Atlantis Press International BV, 2022. http://dx.doi.org/10.2991/978-94-6463-082-4_10.

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Khoo, Pui San, Shukur Abu Hassan, Muhammad Asyraf Muhammad Rizal, Ahmad Ilyas Rushdan, Mohd Yazid Yahya e Mat Uzir Wahit. "Enhancing Flexural Properties of Recycled Glass Fibre Reinforced Polyester with Eggshell-Derived Calcium Oxide". In Lecture Notes in Networks and Systems, 332–42. Cham: Springer Nature Switzerland, 2024. https://doi.org/10.1007/978-3-031-80341-3_26.

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Zamli, A. O. A., R. Hassan, M. N. M. Sidek, A. Awaludin, B. Anshari, N. H. A. Hamid e S. M. Sapuan. "Flexural Performance of Strengthened Glued Laminated (GLULAM) Timber Beam Using Glass Fibre-Reinforced Polymer (GFRP)". In Green Infrastructure, 75–92. Singapore: Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-16-6383-3_6.

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Gad, Mahmoud Anwar, Ehsan Nikbakht, Anas Khaled e Ahmed Al-Raeeini. "Ultimate Strength of Glass Fibre Reinforced Polymer—Engineered Cementitious Composites (GFRP-ECC) Sandwich Composite Sections". In Advances in Civil Engineering Materials, 51–61. Singapore: Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-33-6560-5_6.

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El Bahaoui, Jalal, Mohamed Chairi, Guido Di Bella, Chiara Borsellino e Federica Favaloro. "Effect of Fiber Orientation and Matrix Type on Machining Behavior and Structural Integrity of Glass and Basalt Fiber-Reinforced Polymer Composites". In Machining Polymer Matrix Composites, 39–64. IGI Global, 2023. http://dx.doi.org/10.4018/978-1-6684-9927-6.ch002.

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The marine industry is adopting composite materials with a polymer matrix for shipbuilding due to new technologies and high-performance expectations. However, selecting the right material is challenging, especially considering the machining behavior required for manufacturing cylindrical composite structures. This study focused on evaluating the turning operation and mechanical properties of composites made of glass and basalt fibers with a polymer matrix specifically for maritime construction. The composites consisted of two fabric types, six layers, and two fiber orientation lay-ups, using vinyl ester resin and polyester as the matrix. Test specimens were machined and analyzed, revealing that the hardness and mechanical properties had an impact on the machining process. Glass fiber reinforced polymer (GFRP) samples were successfully machined, resulting in well-formed and undamaged FRP bars. In contrast, basalt fiber reinforced polymer (BFRP) specimens faced difficulties during machining, with matrix splitting, interfacial delamination, fiber ripping.

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Thomas, A. H. "Glass Fibre Reinforced Plastic (GFRP) permanent rockbolts". In Tunnels and Underground Cities: Engineering and Innovation meet Archaeology, Architecture and Art, 3200–3209. CRC Press, 2020. http://dx.doi.org/10.4324/9781003031635-69.

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Atti di convegni sul tema "Glass fibre reinforced polyester (GFRP)"

Ifrahim, Muhammad Saad, Abdul Jabbar Sangi e Shaista Khan. "Experimental Study on Bond Performance between Concrete and BFRP Bars". In Technology Enabled Civil Infrastructure Engineering & Management Conference, 85–92. Switzerland: Trans Tech Publications Ltd, 2025. https://doi.org/10.4028/p-3vti7x.

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The problem of corrosion in reinforced concrete infrastructure can be addressed by using fibre-reinforced polymer (FRP) bars, since they are a feasible alternative due to their non-corrosive nature. Basalt fibre-reinforced polymer (BFRP) bars have recently gained attention as a possible substitute for both of these materials because they are less expensive than Carbon Fibre-Reinforced Polymer (CFRP) and have greater tensile strength than Glass Fibre-Reinforced Polymer (GFRP). While considerable research has been conducted on CFRP bars and GFRP bars, studies on BFRP are limited, hindering its incorporation into design guidelines. Therefore, in this study, bond behaviour of BFRP bars in concrete is experimentally evaluated. This study concludes that although BFRP bar shows more slip than steel bar, its bond strength is comparable to that of steel bar. It is also found that the bond strength and maximum slippage reduced with an increase in the bars' diameter and embedment length. Furthermore, the bond strength improves as the cover increases. Furthermore, bond strength equations as proposed by ACI 440.1 R15, CSA S806-02, and CSA S6-06 underestimated the experimental bond strength.

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Srinivasan, Malur N., e Vanchak Chayakul. "Buckling Behavior of Glass-Fiber Reinforced Polyester Pultruded Columns". In ASME 2011 International Mechanical Engineering Congress and Exposition. ASMEDC, 2011. http://dx.doi.org/10.1115/imece2011-62216.

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Fiber-reinforced plastic materials are used for lightweight structural applications in engineering. This paper is intended to contribute to knowledge of the buckling behavior of glass-fiber reinforced polyester (GFRP) composite I-section pultruded columns. Columns of two different lengths: 5.5 ft and 8.33 ft were axisymmetrically or eccentrically loaded in compression, until failure and the mid-point lateral deflections were measured during loading. Euler’s theory was used to determine theoretical deflection for comparison with the experimentally determined ultimate loads in the axisymmetrically loaded columns. An equation derived from the differential equation of the deflection curve was used for comparison with the experimental load-deflection curves for the eccentrically loaded columns. Limited scanning electron microscopy was done to differentiate between the microscopic failures in I-section columns.

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Aljuboury, Muhsin, Md Jahir Rizvi, Stephen Grove e Richard Cullen. "Bolted Flange Joint Made of Glass Fibre Reinforced Polymer (GFRP) for Oil and Gas Pipelines". In ASME 2018 Pressure Vessels and Piping Conference. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/pvp2018-84593.

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The objective of this work is an experimental and numerical investigation for a bol Richard Cullen ted composite flange connection for composite pipes, which are used in the oil and gas applications, and obtain a joint with high strength and high corrosion resistance. For the experimental part, we have designed and manufactured the required mould, which ensures the quality of the composite materials and controls its surface grade. Based on the ASME Boiler and Pressure Vessel Code, Section X, this GFRP flange has been fabricated using biaxial glass fibre braid and polyester resin in a vacuum infusion process. Numerically, an investigation is carried out using 3D finite element analysis (FEA) of a bolted GFRP flange joint including flange, pipe, gasket and bolts. This model has taken into account the orthotropy of the GFRP material and the non-linear behaviour of the rubber gasket material for both the loading and non-loading conditions. Furthermore, the leakage propagation between the flange and the gasket has also been simulated in this investigation by using the pressure-penetration criteria PPNC in ANSYS. Finally, the flange has been tested under the internal pressure and the agreement between the experimental and numerical results is excellent.

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Liao, Mengyuan, Yuqiu Yang, Ying Yu e Hiroyuki Hamada. "Hydrothermal Ageing Mechanism of Natural Fiber Reinforced Composite in Hot Water". In ASME 2012 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/imece2012-87314.

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As well known, sustainability issues represented by the environment and resource protection have been paid close attention nowadays. Natural fiber has been an increasing interest and promising as reinforcing fiber in polymeric composites due to its low density, cost, acceptable specific strength and biodegradation. Even though, the principle challenge for natural fibers used as reinforcement is their internal strong water-absorption ability when the exposed in wet and water environment. Long-term hydrothermal degradation behavior of Glass reinforced composite (GFRP) and jute reinforced composite (JFRP) have been discussed in previous study on the basis of the great amount of physical and mechanical testing results. As former working reported, gained water content increases linearly against the square root of aging time followed by gradual increase trend in longer duration both in JFRP and GFRP. In particularly, JFRP’s weight loss performance occurred earlier with higher value compared to GFRP. However, water absorption and weight loss mechanism, relationship between weight change and retention of mechanical property for JFRP didn’t report and illustrate clearly and extensively. Therefore, in order to figure it out comprehensively, the current study was focus on hydrothermal ageing mechanism and corresponding degraded mechanical behavior. Firstly, 2 layers of deeply dried and natural dried jute woven fabric reinforced unsaturated polyester were fabricated by hand-layup method. The cut samples were immersed into 80°C hot water bath for predetermined durations and inspected by ultrasonic wave. Afterwards, 3-point bending test with acoustic emission (AE) measurement was carried out for aged samples. The weight change mechanism, evolution of internal deterioration and mechanical property along with ageing time was investigated. The result indicated that JFRP can absorb water easily and quickly compared with GFRP owing to jute fiber’s hydroscopic nature. Weight loss was caused as a result of resin particle loss and pectin dissolution from the developed micro-crack owing to hydrothermal water environment. What’s more, internal serious deterioration occurred after 24 hours immersion leading to larger reduction of mechanical property.

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Anni, Ibnaj Anamika, Madison S. Kaminskyj, Kazi Zahir Uddin, Francis M. Haas, Behrad Koohbor, Madison S. Kaminskyj, Joseph F. Stanzione III, Francis M. Haas, Behrad Koohbor e Joseph F. Stanzione III. "Repair of Damaged Fiber Reinforced Polymer Composites with Cold Spray". In ITSC 2023. ASM International, 2023. http://dx.doi.org/10.31399/asm.cp.itsc2023p0742.

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Abstract The promising structural properties of fiber-reinforced polymer composites make them widely popular in the energy, automotive, defense, and aerospace industries. One of the most challenging limitations associated with the use of composites in the above applications is the maintenance and repair protocols. In this study, a novel cold spray approach is introduced as an efficient alternative for the structural repair of fiber composites. Damages in the form of circular tapered holes are created in glass fiber-reinforced polymer (GFRP) composite substrates using a conventional drilling process. The in-lab created damages are repaired by cold spray with thermoplastic (nylon 6) and thermoset (polyester epoxy resin, PER) materials. The fundamental adhesion mechanisms are investigated through microstructural observations, which point to adiabatic shear instability due to the occurrence of severe plastic deformation as a governing factor. Microstructural examinations also suggest that no significant fiber damage or surface degradation occurs after the repair by cold spray. Mechanical tests performed on neat, damaged, and repaired composites reveal the partial recovery of structural performance and load-bearing capacity after cold spray repair. Results obtained in this work highlight cold spray as a promising alternative technique for onsite structural repair of composite structures with minimal pre/post-processing requirements.

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Laagland, Jeroen. "Permanent glass-fibre-reinforced under water concrete floor". In IABSE Congress, Ghent 2021: Structural Engineering for Future Societal Needs. Zurich, Switzerland: International Association for Bridge and Structural Engineering (IABSE), 2021. http://dx.doi.org/10.2749/ghent.2021.1339.

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Glass fibre reinforced polymer (GFRP) has been applied in underwater concrete floors as part of the permanent structure of two underpasses within a road upgrade project in The Netherlands. This application is unique in view of the permanent nature of the use of GFRP in such structures. These underwater concrete floors are subjected to both downwards loads, such as traffic loads and permanent load, as well as by water pressure uplift.The construction pit consists of permanent sheet piling with a prefab concrete deck on top and a permanent underwater concrete floor between the sheet piling. This permanent underwater concrete floor is reinforced with only GFRP reinforcement. The fibre prevents cracking in the outer zone and increase the tensile strength.

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Kaklauskas, Gintaris, Edgaras Timinskas, P. L. Ng e Aleksandr Sokolov. "Deformation and Cracking Behaviour of Concrete Beams Reinforced with Glass Fibre-Reinforced Polymer Bars". In IABSE Symposium, Guimarães 2019: Towards a Resilient Built Environment Risk and Asset Management. Zurich, Switzerland: International Association for Bridge and Structural Engineering (IABSE), 2019. http://dx.doi.org/10.2749/guimaraes.2019.0500.

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This paper reports the experimental and numerical studies of concrete beams reinforced with glass fibre-reinforced polymer (GFRP) reinforcing bars with and without the addition of steel fibres. GFRP- reinforced concrete beam specimens of equivalent geometry were produced and tested under symmetrical two-point loading configuration. Deformation and cracking behaviour were monitored during the test, and the curvature was determined from the measured deformation response over the pure bending zone. In view of the lower stiffness of GFRP bars compared to conventional steel bars, the effectiveness of adding steel fibres to increase the flexural stiffness is investigated. Experimental results show that the steel fibres could reduce the average crack width and deflections of the beam, and could lead to a more ductile failure mode. The beam specimen was numerically analysed by employing the nonlinear finite element programme ATENA, and the analytical results are in good agreement with the experimental results.

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R, Akhil. "Flexural Strengthening Of Reinforced Cement Concrete Beam Using S-Glass Fibre". In The International Conference on scientific innovations in Science, Technology, and Management. International Journal of Advanced Trends in Engineering and Management, 2023. http://dx.doi.org/10.59544/squq7839/ngcesi23p77.

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Worldwide a great deal of research is currently being conducted concerning the use of fiber reinforced plastic wraps, laminates and sheets in the repair and strengthening of reinforced concrete members. Fiber reinforced polymer (FRP) application is a very effective way to repair and strengthen structures that have become structurally weak over their life span. FRP repair systems provide on economically viable to alternative to traditional repair systems and materials. Experimental investigations of flexural behaviour of RC beams strengthened by using glass fiber reinforced polymer sheets are carried out. Externally reinforced concrete beams with Epoxy bonded GFRP sheets were tested to failure using a symmetrical two point concentrated static loading system. Two sets of beams were casted for this experimental test program. The beam casted as weak in flexure and strengthened using glass fibre reinforced polymer sheets out of two beam another is controlled beam. The strengthening of the beam is done with different amount and configuration of GFRP sheets. Experimental Data on load, deflection and failure modes of each of the beams were obtained. The detail procedure and application of GFRP sheets for strengthening of RC beam is also included. The effect of number of GFRP layers and its orientation on ultimate load carrying capacity and failure mode of the beams are investigated.

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Akbar, Muhammad F., Ghassan N. Jawad, Laith R. Danoon e Robin Sloan. "Delamination Detection in Glass-Fibre Reinforced Polymer (GFRP) Using Microwave Time Domain Reflectometry". In 2018 15th European Radar Conference (EuRAD). IEEE, 2018. http://dx.doi.org/10.23919/eurad.2018.8546540.

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