scholarly journals Combined Effects of Sustained Loads and Wet-Dry Cycles on Durability of Glass Fiber Reinforced Polymer Composites

2017 ◽  
Vol 2017 ◽  
pp. 1-14
Author(s):  
Mengting Li ◽  
Jun Wang ◽  
Weiqing Liu ◽  
Ruifeng Liang ◽  
Hota GangaRao ◽  
...  
Keyword(s):  
Tensile Strength ◽  
Elastic Modulus ◽  
Fiber Reinforced Polymer ◽  
Distilled Water ◽  
Combined Effects ◽  
Gfrp Composites ◽  
Glass Fiber Reinforced Polymer ◽  
Reinforced Polymer ◽  
Glass Fiber Reinforced ◽  
Sustained Loads

This paper deals with durability of glass fiber reinforced polymer (GFRP) composites under the combined effects of sustained tensile loads and wet-dry (WD) cycles. Two different solutions (distilled water and saltwater) were used to imitate the freshwater and marine environments, respectively. Tensile properties of the unconditioned and conditioned specimens were measured to study the durability of GFRP composites under these 2 effects. The response indicated that both tensile strength and elastic modulus increased initially upon WD cycles, which was attributed to both the postcuring of resin and the sustained tensile stress allowing for fastec cure. Further exposure to WD cycles in distilled water or saltwater led to a steady decrease in tensile strength and modulus. WD cycles of saltwater and distilled water have similar effects on the degradation of the tensile properties for unstressed specimens. However, the elastic modulus and elongation at rupture of stressed specimens under WD cycles of saltwater decreased more than those specimens under WD cycles of distilled water. Moreover, increase of sustained loads led to a decrease in tensile strength. Based on Arrhenius method, a prediction model which accounted for the effects of postcure processes was developed. The predicted results of tensile strength and elastic modulus agree well with those obtained from the experiments.

Influence of rib parameters on mechanical properties and bond behavior in concrete of fiber-reinforced polymer rebar

2020 ◽  
Vol 24 (1) ◽  
pp. 196-208
Author(s):  
Pu Zhang ◽  
Shuangquan Zhang ◽  
Danying Gao ◽  
Fang Dong ◽  
Ye Liu ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Elastic Modulus ◽  
Glass Fiber ◽  
Fiber Reinforced Polymer ◽  
Fiber Reinforced ◽  
Glass Fiber Reinforced Polymer ◽  
Bond Behavior ◽  
Reinforced Polymer ◽  
Glass Fiber Reinforced

Mechanical properties of fiber-reinforced polymer rebar and bond behavior between the fiber-reinforced polymer rebar and concrete are highly related to rib parameters, including rib depth and rib spacing. Therefore, rib parameters should be taken into account when fiber-reinforced polymer bars are used as the structure reinforcement. In this article, the tensile properties of glass-fiber-reinforced polymer rebars with different rib depths and rib spacings are tested. The influences of different rib depths and rib spacings on the bond behavior between glass-fiber-reinforced polymer rebar and concrete are investigated by pull-out test. Experimental results show that the rib depth has a distinctive effect on the ultimate tensile strength, elastic modulus, and ultimate elongation of glass-fiber-reinforced polymer rebar. The tensile strength and elastic modulus of glass-fiber-reinforced polymer rebar with shallow rib are remarkably higher than those of glass-fiber-reinforced polymer bars with deep rib. However, compared with the glass-fiber-reinforced polymer bars with shallow rib, the glass-fiber-reinforced polymer bars with deep rib contribute larger bond strength with concrete. Besides, the bond strength and basic anchorage length are predicted by taking rib depth and rib spacing into account. A modified Bertero–Popov–Eligehausen model is adopted to simulate the bond stress–slip behavior, and the ascending branch of bond stress–slip curve expressed by rib depth and rib spacing is also proposed. The calculated results are in good agreement with the test ones.

EFFECT OF NANOCLAY CONTENT ON FLEXURAL PROPERTIES OF GLASS FIBER REINFORCED POLYMER (GFRP) COMPOSITES

2015 ◽  
Vol 76 (3) ◽  
Author(s):  
Widia Wahyuni Amir ◽  
Aidah Jumahat ◽  
Jamaluddin Mahmud
Keyword(s):  
Flexural Strength ◽  
Flexural Modulus ◽  
Fiber Reinforced Polymer ◽  
Flexural Test ◽  
Gfrp Composites ◽  
Glass Fiber Reinforced Polymer ◽  
Reinforced Polymer ◽  
Glass Fiber Reinforced ◽  
Gfrp Composite ◽  
Nanoclay Content

This paper presents a study on the flexural properties of glass fiber reinforced polymer composites. The epoxy-nanoclay resin was milled using a three roll mill machine to produce exfoliated structure nanocomposites. The fiber laminates specimens were manufactured by vacuum bagging system. These specimens were tested in the three point bend configuration following the ASTM D7264. The flexural modulus, flexural strength and strain to failure were then determined based on the flexural test results. The results showed that flexural modulus and flexural strength increases when a certain amount of nanoclay was included in the resin system. A maximum of 80% and 37% improvement of flexural strength and flexural modulus, respectively, were found at 5 wt% nanoclay content when compared to the neat GFRP composite. The improved properties of GFRP composites were achieved mostly due to an increase on the interfacial surface areas as well as a well-dispersion of nanoclay in the GFRP composite system. The fracture surfaces of specimens after flexural test were observed under FESEM. The results showed that the compressive failure region in the fiber was a dominant failure mechanism of the specimens due to a large compressive area on the fracture surface.

scholarly journals Effect of Sea Water Environment Exposure on Glass Fiber Reinforced Polymer Composites

2019 ◽  
Vol 9 (1) ◽  
pp. 670-674
Keyword(s):  
Mechanical Properties ◽  
Glass Fiber ◽  
Mechanical Behaviour ◽  
Sea Water ◽  
Fiber Reinforced Polymer ◽  
Fiber Reinforced ◽  
Gfrp Composites ◽  
Glass Fiber Reinforced Polymer ◽  
Reinforced Polymer ◽  
Glass Fiber Reinforced

Glass fiber reinforced polymer(GFRP) composites are currently used in large numbers of diverse applications ranging from tip and engine strut fairings in aircrafts, building panels and dash boards in automotive vehicles, boat hulls in ocean vehicle structures, golf clubs and race helmets in sports equipment, etc. The service life of composite materials are influenced by the different adverse environment which leads to various failures like corrosion, fatigue, fracture, etc., results in loss of structural integrity due to environmental conditions. The investigations involved are to study the mechanical behaviour of these materials when subjected to various adverse conditions of the environment at different intervals of exposure due to change in moisture and temperature. Experiments were conducted on GFRP composites with and without exposing to different environment conditions of sea water. Tensile and flexural tests are conducted to predict the mechanical behaviour of both normal specimens and specimens exposed with sea water. Reduction in mechanical properties found due to maximum absorption of any liquid by the material. When temperature increases better in mechanical properties are noticed and at low temperature the composite behaves like a brittle.

scholarly journals Hygrothermal Studies on GFRP Composites: A Review

2018 ◽  
Vol 144 ◽  
pp. 02026 ◽  
Author(s):  
Manjunath Shettar ◽  
Aakarshit Chaudhary ◽  
Zaid Hussain ◽  
U. Achutha Kini ◽  
Sathyashankara Sharma
Keyword(s):  
Fiber Reinforced Polymer ◽  
Gfrp Composites ◽  
Glass Fiber Reinforced Polymer ◽  
Environment Effects ◽  
Reinforced Polymer ◽  
Glass Fiber Reinforced ◽  
Hygrothermal Environment ◽  
Fiber Matrix Interface ◽  
Fiber Matrix ◽  
The Individual

The objective of this paper is to review the hygrothermal environment effects on Glass Fiber Reinforced Polymer (GFRP) composites. A brief summary of the hygrothermal phenomenon and its mechanisms of GFRP is followed by detailed review of hygrothermal effects on the GFRP. The review also includes the different hygrothermal aging tests viz., cold soaking, boiling soaking, thermal shocks and use of environmental chamber, procedures and significance. At the end, hygrothermal effects on the individual constituents of GFRP viz., fiber, matrix and the fiber-matrix interface, are discussed.

Preparation and Characterization of TiO2 Particulate Filled Polyester Based Glass Fiber Reinforced Polymer Composite

2014 ◽  
Vol 984-985 ◽  
pp. 360-366 ◽  
Author(s):  
S. Srinivasa Moorthy ◽  
K. Manonmani ◽  
M. Sankar Kumar
Keyword(s):  
Mechanical Properties ◽  
Glass Fiber ◽  
Chemical Resistance ◽  
Fiber Content ◽  
Fiber Reinforced Polymer ◽  
Fiber Reinforced ◽  
Gfrp Composites ◽  
Glass Fiber Reinforced Polymer ◽  
Reinforced Polymer ◽  
Glass Fiber Reinforced

Polyester based glass fiber reinforced polymer (GFRP) composites are widely used in marine and automotive industries because of its strength to weight ratio with lower price. In order to have the better properties of GFRP composites, the particulate filler material titanium oxide (TiO2) was added in unsaturated polyester resin with the fiber reinforcement by hand lay-up process. The fiber content was kept at 35 wt% constant with the fiber length of 5 cm. The particulate was varied with 2 wt. %, 4 wt. %, 6 wt. %, 8 wt. %, and 10 wt. %. Experiments were carried out to study the mechanical properties like tensile strength, impact strength, and Rockwell hardness. The chemical resistance analysis (CRA) was carried out by weight loss method. The mechanical properties of the hybrid reinforced composites were improved due to the fiber content with increased particulate content. The influence of the particulate content was more pronounced in the chemical resistance.

scholarly journals Investigation bending behaviors of the slabs with glass fiber reinforced polymer composite and steel bars

2021 ◽  
Vol 4 (4) ◽  
pp. 227-238
Author(s):  
Alper Karadis ◽  
Kabil Cetin ◽  
Taha Yasin Altıok ◽  
Ali Demir
Keyword(s):  
Glass Fiber ◽  
Polypropylene Fiber ◽  
Fiber Reinforced Polymer ◽  
Polypropylene Fibers ◽  
Gfrp Composites ◽  
Glass Fiber Reinforced Polymer ◽  
Reinforced Polymer ◽  
Glass Fiber Reinforced ◽  
Gfrp Composite ◽  
Steel Bars

Glass fiber reinforced polymer (GFRP) composites have been frequently used in engineering applications in recent years. GFRP composites produced by using glass fiber and epoxy resin have significant advantages such as high strength, lightness, and resistance against corrosion. However, GFRP composites exhibit a more brittle behavior than steel bars. This study aims to investigate both the experimental and numerical bending behavior of slabs with GFRP bars, steel bars, and polypropylene fiber. Within the scope of experimental studies, 5 slabs were built. Two slabs called SS-1 and SS-2 have only steel bars. Two slabs called GFRPS-1 and GFRPS-2 have only GFRP composite bars. A slab called GFRPS-F has both GFRP composite bars and polypropylene fibers. Polypropylene fibers are added to fresh concrete to improve the slab’s ductility. Three-point bending tests have been carried out on the slabs. All slabs are subjected to monotonic increasing distributed loading until collapse. As a result of tests, GFRPS slabs have carried %53 higher load than SS slabs. However, the SS slabs have exhibited a more ductile behavior compared to the GFRPS slabs. GFRPS slabs have more and larger crack width than other slabs. The addition of 5% polypropylene fiber by volume to concrete has a significant contributed to ductility and tensile behavior of slab. The average displacement value of GFRPS-F slab is 22.3% larger than GFRPS slab. GFRPS-F slab has better energy consumption capacity than other slabs. The energy consumption capacity of GFRPS-F slab is 1.34 and 1.38 times that of SS and GFRPS slabs, respectively. The number of cracks in GFRPS-F slab is fewer than GFRPS slabs. The fibers have contributed to the serviceability of the GFRPS slabs by limiting the displacement and the crack width. GFRPS-F exhibits elastoplastic behavior and almost returns to its first position when the loading is stopped. In addition, experimental results are verified with numerical results obtained by using Abaqus software. Finally, it is concluded that GFRP composite bars can be safely used in field concretes, concrete roads, prefabricated panel walls, and slabs.

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