Papers by Keyword: Glass Fiber

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Authors: Woo Tai Jung, Jong Sup Park, Seung Han Kim
Abstract: Following the recent growing interest on long-lasting structures, various researches attempt to exploit Fiber Reinforced Polymer (FRP) to constructions owing to the remarkable reduction of maintenance costs brought by its outstanding resistance to corrosion. However, research dedicated to curved FRP construction material applicable to tunnel or arch bridge is still absent. This study conducts loading tests and finite element analysis in order to examine the behavior of curved FRP-concrete panel produced by pultrusion. The test results reveal that FRP and concrete exhibit linear elastic behavior until the maximum load. The parametric analysis with various FRP sections shows that the behavior of the curved FRP-concrete composite panel depends on the web height of FRP, the spacing of the webs, the length of the flange and the radius of curvature.
Authors: Sławomir Zolkiewski
Abstract: The tested specimens are fibre-metal laminates. The samples are made as a connection between a metal sheet plate and a fibreglass laminate. Epoxy resins or polyester resins were applied in matrix of the composite. In this paper the exemplary results of testing on abrasion of composites with the fibreglass laminate plate were presented. Thanks to the results it is possible to estimate and compare the surface quality of the samples together with the joint of the fibreglass laminate. In assumed testing group of laminates, it is also possible to compare the impact of different basis weight of fabrics on the level of abrasive wear. The most proper material properties such as a type of connection or basis weight of applied laminate fabric were defined. In order to determine the degree of abrasive wear of tested samples and evaluate the testing results the methodology of research was assumed as: abrasive test and the visual valuation, measurement of mass decrement, measurement of geometrical structure of the composite's profile on the side of laminate. Taking into consideration the results of testing the weighed and calculated mass losses of the particular samples were compared. The measurements were taken in accordance with the EN ISO 12947-3:1998 norm.
Authors: Oliver Weichold
Abstract: Glass rovings undergo a loss in tensile strength when aged in highly alkaline concrete. Based on the hypothesis that this loss is due to hydrolysis of the silicate network, binary polymer/pozzolan and ternary polymer/pozzolan/cement coating formulations have been developed in order to provide both corrosion protection and improved fibre-matrix adhesion. While the ternary mixtures were found to do either or, the best overall result was obtained with the binary mixture poly(vinyl acetate)/silica 20:80, showing a 1.8-fold increase in the pull-out load and a 1.6-fold increase in the residual tensile strength when compared to the as-received glass.
Authors: Burcu Ertuğ
Abstract: Most widely used material in ship hull construction is undoubtedly the steel. Composite materials have become suitable choice for marine construction in 1960s. The usage of the fiber reinforced plastic (FRP) in marine applications offers ability to orient fiber strength, ability to mold complex shapes, low maintenance and flexibility. The most common reinforcement material in marine applications is E-glass fiber. Composite sandwich panels with FRP faces and low density foam cores have become the best choice for small craft applications. The U.S Navy is using honeycomb sandwich bulkheads to reduce the ship weight above the waterline. Composites will play their role in marine applications due to their lightness, strength, durability and ease of production. It is expected that especially FRP composites will endure their life for many years from now on in the construction of boat building.
Authors: Cagatay Yılmaz, Cagdas Akalın, Esat Selim Kocaman, Mehmet Yıldız
Abstract: Damage accumulation in uni-directional glass fiber reinforced epoxy matrix composite manufactured with a stacking sequence of [90/0/0] s using vacuum infusion method is investigated by monitoring the change in Poisson’s ratio during quasi-static tension and quasi static cyclic tension test. During the tests, axial and transversal strains are recorded by utilizing extensometer and a strain gauge to compare the response of sensor types for the evolution of Poisson’s ratio.
Authors: Jian Wei Huang
Abstract: Currently, an environmental reduction factor (ERF) is incorporated in design codes/guidelines of Fiber Reinforced-Polymer (FRP) in reinforced concrete (RC) structures to account for the FRP long-term durability. Due to the lack of real time durability data, justification of the ERF is still necessitated. This paper presents a calibration of ERF for GFRP bar to be used in China on the basis of the prediction of GFRP long-term performance with monthly average temperature records from 32 major cities. Research results show that the ERF values vary from 0.49 to 0.58 at 100% R.H. exposure, while ERFs are greater than 0.70 for all cases being studied when R.H. is below 90%. On the basis of this study, ERF can be recommended as of 0.70 and 0.50 for application with R.H. <90% and moisture saturated exposures, respectively.
Authors: Jian Wei Huang
Abstract: To avoid the creep rupture of GFRP bar in RC members, not exceeding 20% design tensile strength (ffu)) is recommended as design limit for sustained stress level in GFRP bar in current ACI 440.1R-06 guideline. In this paper, the effects of using light weight concrete (LWC) is studied to investigate the sustained stress level in GFRP bar RC bridge decks by a parametric study. Results show that the sustained stress in GFRP bar in LWC bridge decks is in between 2.8-5.7% of ffu, while it is about 3.44-7.52% for normal weight concrete (NWC) deck.
Authors: Yue Yin, Shui Dong Zhang
Abstract: Due to its excellent comprehensive properties, glass fiber reinforced flame retardant PBT was widely applied in electrical accessory. In this paper, the recycled glass fiber reinforced flame retardant PBT(RGFFRPBT)with injection times effect on its carboxyl content, characteristic viscosity of PBT and the average length of glass fiber were studied. The properties of RGFFRPBT PBT including mechanical, thermal and rheological properties were well investigated. The results demonstrated that when GFFRPBT was injected third time, the length of glass fiber and characteristic viscosity of PBT decreased from 895um, 0.95 to 590um, 0.52, respectively. It also indicated that the decrease trend would accelerate with higher injection times. When the injection times were twice, the notched impact strength, flexural and tensile strength of RGFFRPBT-2nd decreased to 54J/m, 128MPa and 96.1MPa, respectively. Thermal stability, maximal crystallization temperature, melting point and HDT of RGFFRPBT-2nd were not significant differed to those of GFFRPBT. When the injection times were higher than three times, all of the properties decreased drastically. With the increasing of injection times, the samples show shear-thinning and nonlinear viscoelastic properties and the shear viscosity decreased, distinctly. The results illuminated that mechanical and thermal properties of RGFFRPBT-2nd were suitable to use in the electronic and electric field.
Authors: A. Thiagarajan, K. Palaniradja, N. Rajesh Mathivanan, M. Naresh
Abstract: The impact behaviors of glass fibre reinforced/epoxy nanocomposites were studied by experimental using instrumental falling weight testing machine at three different energy levels. Two types of laminates were prepared by hand lay-up method with varying nanoclay into the epoxy in a 1%, 3% and 5%, respectively. The structures of nanocomposites were studied using X-ray diffraction (XRD). It was found that the nanoclay was orderly exfoliated in the epoxy resin. The impact properties of maximum load and energy absorption were determined. It was observed that addition of 3% nanoclay into the epoxy, the maximum load was enhanced by 32% and energy absorption by 24% at the energy level of 24.89J. The impact fractured surface morphology of the glass fibre/epoxy nanocomposites was analyzed using scanning electron microscopy (SEM).
Authors: T.L. Hsin, W.H. Hsing, Nour Chuang
Abstract: The aim of this research is to increase the membrane’s transmitted intensities; it used Argon plasma etching to process the anti-reflective structure on PMMA/glass fiber membrane surface. The anti-reflective structure could increase the light transmission at the identical specification of membrane’s basic cloth. Membrane’s transmitted intensities can directly affect it products competitiveness. The parameter of experimentation set with distance between sample and RF plate are 19 or 5.5 centimeters, plasma output power is 270, 240, 210 Watt respectively, each process time is 6, 12, 18, 24, 30 seconds. In this stage, the best transmitted intensity of parameter is 19cm, 210W, 30sec; it increased 2.4 % than non-treatment sample. The summary of this study, decreased plasma output power would reduce the impact extent of plasma gas but uniformity of structure should increase. Decreased the distance between sample and RF plate can avoided the degeneration of energy, reinforced the problem of insufficient etching and reduced the turbulence.
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