Influence of curing on the mechanical performance of FRP laminates

Singh, S. B.; Vummadisetti, Sudhir; Chawla, Himanshu

doi:10.1016/j.jobe.2017.12.002

Cited by 37 publications

(15 citation statements)

References 22 publications

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“…Next, the flexural stress has a slight reduction and holds a value for a brief time. Finally, the stress continues to rise and comes to a severe damage stage, and the multi-CFPL presents a ductile flexural failure other than a catastrophic break [8]. When the damage is just beginning to appear in a multi-CFPL, the PC layers could act as protectors to avoid further cracking because of their good plasticity.…”

Section: Resultsmentioning

confidence: 99%

“…Therefore, the CFRP laminates are widely applied in industries such as wind turbine blades in clean energy fields [3] and fuselages, wing skins, and other critical components in aircraft fields [4,5]. In addition, the CFRP laminates present highly flexible designability [6,7,8,9], making their fabrication process easily tailored to meet different application requirements.…”

Section: Introductionmentioning

confidence: 99%

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A Thermoplastic Multilayered Carbon-Fabric/Polycarbonate Laminate Prepared by a Two-Step Hot-Press Technique

Liu

Yang

et al. 2018

Polymers

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Carbon fiber (CF) reinforced thermoplastic composites have gradually become increasingly popular in composite production owing to their lower hazard level, good structural flexibility and recyclability. In this work, a multilayered carbon-fabric/polycarbonate laminate (multi-CFPL) was fabricated by a two-step hot-press process, mainly based on the thermoplastic properties of its polycarbonate (PC) matrix. Different from the conventional one-step method, the two-step hot-press process was composed of two separate procedures. First, a unit-hot-press operation was introduced to prepare a single-layered carbon-fabric/PC laminate (simplified as unit-CFPL). Subsequently, a laminating-hot-press was employed to compress several as-prepared unit-CFPLs bonded together. This combined process aims to reduce the hot-press temperature and pressure, as well as facilitate the structure designability of this new composite. Several mechanical investigations were conducted to analyze the effect of the hot-press parameters and unit-CFPL numbers on the performance of this multi-CFPL material, including flexural, uniaxial tensile and impact tests. The results reveal that the multi-CFPL exhibits a good stability of flexural and tensile properties in terms of strength and modulus. Furthermore, during impact tests, the multi-CFPL presents an accelerated growth of peak force and energy absorption capability with increasing unit-CFPL layers.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A Thermoplastic Multilayered Carbon-Fabric/Polycarbonate Laminate Prepared by a Two-Step Hot-Press Technique

Liu

Yang

et al. 2018

Polymers

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“…Moreover, the core concrete can prevent the local buckling of the external GFRP tube, thus enhancing the structural stability [21]. The GFRP composite materials also have the characteristics of lightweight and corrosion resistance [22][23][24][25][26]. Therefore, the GFRP tube can protect the core concrete and improve the overall durability of structures when they are used in a relatively harsh environment.…”

Section: Introductionmentioning

confidence: 99%

Research on bond–slip performance between pultruded glass fiber-reinforced polymer tube and nano-CaCO₃ concrete

Guo

Zhu

et al. 2020

Nanotechnology Reviews

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The article describes an experimental study on the bond–slip performance between the pultruded glass fiber-reinforced polymer (GFRP) tube and the nano-CaCO3 concrete. Taking the nano-CaCO3 concrete strength and GFRP tube thickness as primary parameters, nine specimens were designed and tested to study the influence of these parameters on the bond strength of the specimens. Besides, three specimens filled with the ordinary concrete were also tested by using the push-out tests to make comparisons with the bond performance of the specimens filled with nano-CaCO3 concrete. A total of four push-out tests were conducted on each specimen. The experimental results indicate that there are two types of axial load–slip curves for each specimen in four push-out tests. Moreover, comparison of the results of the push-out tests in the same direction shows that the bond failure load of the specimen decreases with the increase in the number of push-out tests. Based on the analysis of the test results, it is shown that the bond performance between the GFRP tube and the nano-CaCO3 concrete is better than that between the GFRP tube and the ordinary concrete. Furthermore, as the nano-CaCO3 concrete strength increases, the bond strength of the specimens decreases, indicating that the concrete strength has a negative effect on the bond strength. When the nano-CaCO3 concrete strength is relatively smaller (C20), the bond strength of the specimens decreases with the increase in the thickness of the GFRP tube. However, when the nano-CaCO3 concrete strength is relatively larger (C30 and C40), the bond strength of the specimens increases as the thickness of the GFRP tube increases.

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“…For these reasons, the bonding behavior at the interface may deteriorate rapidly if existing concrete structures lie in harsh environments, such as over-high/low temperature, in the presence of moisture, or even near fire and underwater. Therefore, some scholars have suggested replacing the epoxy systems with some inorganic cementitious materials to develop two major strengthening systems which combine FRP composites and cement-based materials [31], namely FRP sheets/plates bonded with a cementitious material [32] Some strengthening and retrofitting materials have been developed for existing concrete structures in the last decade, including textile reinforced mortar (TRM) [1][2][3][4][5][6], fiber reinforced cementitious matrix (FRCM) [7][8][9][10][11][12], textile reinforced concrete (TRC) [13][14][15][16], steel-reinforced grout (SRG) [17,18], and fiber reinforced polymer (FRP) composites [19][20][21][22][23][24][25]. Among them, fiber reinforced polymer (FRP) composites, including FRP sheets, FRP plates, FPR grids, and so forth, have been demonstrated to be an effective solution due to their favorable and prominent properties (e.g., light weight, high tensile strength, excellent corrosion resistance, and durability in harsh environments) [26,27].…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on Shear Strengthening of RC Beams with an FRP Grid-PCM Reinforcement Layer

et al. 2019

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This paper investigates the shear strengthening effect of a number of reinforced concrete (RC) beams strengthened by a reinforcement layer which combines carbon fiber reinforced polymer (CFRP) grid and polymer cement mortar (PCM). A total of ten RC beams, including three types of specimens as Series A and seven kinds of specimens as Series B, were prepared and investigated. The test variables in both series of experiments included various reinforcement ranges and different reinforcement amounts that consisted of CFRP grids’ spacing and cross-section areas. The experimental results suggest that the shear strengthening effect of the CFRP grid-PCM layer for RC beams is obvious and adequate. Meanwhile, better performance is observed if the CFRP grid-PCM reinforcement layer is used for the full sectional reinforcement of RC beams with an I-shaped profile, in contrast to RC beams with reinforcement of the web only. In addition, a new evaluation method based on the effective strain of the CFRP grid is developed to determine the shear capacity of RC beams strengthened by a CFRP grid-PCM layer.

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Influence of curing on the mechanical performance of FRP laminates

Cited by 37 publications

References 22 publications

A Thermoplastic Multilayered Carbon-Fabric/Polycarbonate Laminate Prepared by a Two-Step Hot-Press Technique

A Thermoplastic Multilayered Carbon-Fabric/Polycarbonate Laminate Prepared by a Two-Step Hot-Press Technique

Research on bond–slip performance between pultruded glass fiber-reinforced polymer tube and nano-CaCO₃ concrete

Experimental Study on Shear Strengthening of RC Beams with an FRP Grid-PCM Reinforcement Layer

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Influence of curing on the mechanical performance of FRP laminates

Cited by 37 publications

References 22 publications

A Thermoplastic Multilayered Carbon-Fabric/Polycarbonate Laminate Prepared by a Two-Step Hot-Press Technique

A Thermoplastic Multilayered Carbon-Fabric/Polycarbonate Laminate Prepared by a Two-Step Hot-Press Technique

Research on bond–slip performance between pultruded glass fiber-reinforced polymer tube and nano-CaCO3 concrete

Experimental Study on Shear Strengthening of RC Beams with an FRP Grid-PCM Reinforcement Layer

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Research on bond–slip performance between pultruded glass fiber-reinforced polymer tube and nano-CaCO₃ concrete