A Study on Tensile Behavior According to the Design Method for the CFRP/GFRP Grid for Reinforced Concrete

Kim, Jin Sung; Kim, Seong Jong; Min, Kyoung Jae; Choi, Jung Chul; Eun, Hwa Seong; Song, Bhum Keun

doi:10.3390/ma15010357

Cited by 3 publications

(3 citation statements)

References 24 publications

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“…The FRP composite used for the resin content measurement was prepared directly by the hand lay-up method, which is a molding method for reinforcement lamination and resin impregnation by hand. The hand lay-up manufacturing method involves mold release treatment, mixing resin, inner lamination of peel ply, fiber lamination, and outer lamination of peel ply [17]. To uniformly apply the release agent to the mold (size: 1000 × 1000 mm 2 ), a fabric was moistened with the release agent and used to coat the entire mold.…”

Section: Experimental Methodsmentioning

confidence: 99%

Optimizing Heat Treatment Conditions for Measuring CFRP and GFRP Resin Impregnation

et al. 2022

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As the use of carbon-fiber-reinforced plastic (CFRP) and glass-fiber-reinforced plastic is frequent in the field of construction, a method for measuring FRP resin content is needed. Herein, thermal gravimetric analysis (TGA) was employed to optimize the heat treatment conditions (temperature and time) for determining the resin content in which only the resin was removed without fiber heat loss. Accordingly, the measurement was performed in 100 °C increments at a resin pyrolysis temperature up to 800 °C with a heat treatment time of 4 h to continuously observe the degree of thermal decomposition of the resin. The thermal decomposition of unsaturated polyester was confirmed at the melting point (350 ℃) regardless of the type of fibers used as reinforcement. In the case of CFRP, most of the resin decomposition occurred at 300 °C. Notably, the resin was removed at a pyrolysis temperature of 400 ℃ and almost no change in weight was observed. However, at a pyrolysis temperature of 500 °C or higher, the thermal decomposition of the fibers occurred partially. The results show that the composite resin was removed within 10 min at a pyrolysis temperature of 400 °C in an air atmosphere when using TGA.

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Section: Experimental Methodsmentioning

confidence: 99%

Optimizing Heat Treatment Conditions for Measuring CFRP and GFRP Resin Impregnation

et al. 2022

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“…CFRP laminates are composite materials composed of multiple layers of carbon fiber fabric or prepreg. They are formed by stacking multiple layers of carbon fiber fabric with resin layers and undergoing curing and heating processes [30][31][32][33]. CFRP laminates are processed by vacuum-assisted molding, where single layers of fiber sheets are overlaid at specific angles.…”

Section: Common Cfrp Lamination Anglesmentioning

confidence: 99%

Research on Energy Absorption Characteristics of Bouligand Biomimetic Structure Based on CFRP Composite Materials

et al. 2023

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Enhancing the impact resistance performance of carbon fiber-reinforced polymer (CFRP) laminates stands as a prominent research focus among various nations. Existing studies have shown a tendency towards arbitrary selection of the inter-ply helix angle values in CFRP laminates, which is accompanied by a limited number of samples representing the chosen helix angles. However, existing studies have shown a relatively random selection of spiral angle values between CFRP laminates, and the sample size of selected spiral angles is limited, posing certain limitations. In order to tackle this problem, we have employed a systematic arrangement of combinations to select the optimal helix angle for CFRP laminates. Inspired by the biological structures of Bouligand, we have sequentially chosen 19 distinct sets of helix angles, aiming to overcome the inherent limitations and enhance the research outcomes in this field. In this study, we established 19 finite element models to investigate the behavior of Bouligand-inspired CFRP composite panels under high-velocity bullet impact. The models were created by selecting 19 sets of helix angles within the range of 0 to 90° with a 5° interval. The results show that the energy absorption of the Bouligand layer-stacking composite plate is better than that of the conventional plate. The optimal spiral angles of the CFRP laminate are 25° and 30°, and the energy absorption characteristics of the laminate are the best at these angles. The impact resistance is also the best at these angles. The energy absorption of the Bouligand layer-stacking composite plate is 396% higher in absorbed internal energy and 361% higher in absorbed kinetic energy compared to the conventional layer-stacking composite plate, significantly improving the ballistic performance of the CFRP bulletproof material and providing a reference for the design of individual protection equipment.

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“…The annual economic losses caused by steel corrosion in the United States reach up to 27.6 billion US dollars [ 1 ], while the annual economic losses caused by steel corrosion in China can also reach 3% to 5% of GDP [ 2 ]. In the past 20 years, FRP has been proven to be a successful repair method for external reinforcement of structures, with advantages such as high strength, lightweight, corrosion resistance, and degradation resistance [ 3 , 4 , 5 , 6 , 7 ].…”

Section: Introductionmentioning

confidence: 99%

Study on Flexural Behavior of Corroded I-Shaped Steel Beams Strengthened with Hybrid CFRP/GFRP Sheets

Han

Zhang

2023

Materials

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How to effectively reinforce steel structures with rust and damage is an important research topic in the engineering field. This article takes the rusted I-beam as the research object and analyzes the effects of different CFRP/GFRP reinforcement methods on the bending performance of rusted I-beams through experimental research with a total of 1 unreinforced beam and 7 CFRP/GFRP-reinforced beams. The results show that when the number of CFRP/GFRP-reinforced layers is the same, replacing some of the CFRP with GFRP and using different interlayer mixed laying sequences have little effect on the bending bearing capacity of rusted I-beams. The number of CFRP/GFRP-reinforced layers is the key factor affecting the bending bearing capacity. At the same time, numerical simulation was conducted using finite element software to study the stress distribution and stress development law of the reinforced beam, and the numerical simulation results were consistent with the experimental results.

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A Study on Tensile Behavior According to the Design Method for the CFRP/GFRP Grid for Reinforced Concrete

Cited by 3 publications

References 24 publications

Optimizing Heat Treatment Conditions for Measuring CFRP and GFRP Resin Impregnation

Optimizing Heat Treatment Conditions for Measuring CFRP and GFRP Resin Impregnation

Research on Energy Absorption Characteristics of Bouligand Biomimetic Structure Based on CFRP Composite Materials

Study on Flexural Behavior of Corroded I-Shaped Steel Beams Strengthened with Hybrid CFRP/GFRP Sheets

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