Enhancement of steel/carbon fibre-reinforced polymer adhesively-bonded joints at elevated temperatures through curing

2014 ◽  
Vol 15 (4) ◽  
Author(s):  
Y Bai ◽  
T-C Nguyen ◽  
R Al-Mahaidi ◽  
X-L Zhao
Keyword(s):  
Carbon Fibre ◽  
Elevated Temperatures ◽  
Bonded Joints ◽  
Adhesively Bonded ◽  
Adhesively Bonded Joints ◽  
Reinforced Polymer ◽  
Carbon Fibre Reinforced Polymer ◽  
Fibre Reinforced Polymer

scholarly journals Adhesively bonded joints of jute, glass and hybrid jute/glass fibre-reinforced polymer composites for automotive industry

2021 ◽  
Vol 9 (1) ◽  
Author(s):  
H. F. M. de Queiroz ◽  
M. D. Banea ◽  
D. K. K. Cavalcanti
Keyword(s):  
Automotive Industry ◽  
Failure Load ◽  
Natural Fibre ◽  
Bonded Joints ◽  
Adhesively Bonded ◽  
Adhesively Bonded Joints ◽  
Reinforced Polymer ◽  
Fibre Composites ◽  
Bonded Joint ◽  
Fibre Reinforced Polymer

AbstractNatural fibre-reinforced composites have attracted a great deal of attention by the automotive industry mainly due to their sustainable characteristics and low cost. The use of sustainable composites is expected to continuously increase in this area as the cost and weight of vehicles could be partially reduced by replacing glass fibre composites and aluminium with natural fibre composites. Adhesive bonding is the preferred joining method for composites and is increasingly used in the automotive industry. However, the literature on natural fibre reinforced polymer composite adhesive joints is scarce and needs further investigation. The main objective of this study was to investigate experimentally adhesively bonded joints made of natural, synthetic and interlaminar hybrid fibre-reinforced polymer composites. The effect of the number of the interlaminar synthetic layers required in order to match the bonded joint efficiency of a fully synthetic GFRP bonded joint was studied. It was found that the failure load of the hybrid jute/glass adherend joints increased by increasing the number of external synthetic layers (i.e. the failure load of hybrid 3-layer joint increased by 28.6% compared to hybrid 2-layer joint) and reached the pure synthetic adherends joints efficiency due to the optimum compromise between the adherend material property (i.e. stiffness and strength) and a diminished bondline peel stress state.

Experimental analysis of adhesively bonded joints in synthetic- and natural fibre-reinforced polymer composites

2019 ◽  
Vol 54 (9) ◽  
pp. 1245-1255 ◽  
Author(s):  
HFM de Queiroz ◽  
MD Banea ◽  
DKK Cavalcanti
Keyword(s):  
Polymer Composites ◽  
Automotive Industry ◽  
Natural Fibre ◽  
Lap Joints ◽  
Bonded Joints ◽  
Adhesively Bonded ◽  
Adhesively Bonded Joints ◽  
Reinforced Polymer ◽  
Fibre Composites ◽  
Fibre Reinforced Polymer

The application of adhesively bonded joints in automotive industry has increased significantly in recent years mainly because of the potential for lighter weight vehicles, fuel savings and reduced emissions. The use of composites in making automotive body components to achieve a reduced vehicle mass has also continuously increased. Natural fibre composites have recently attracted a great deal of attention by the automotive industry due to their many attractive benefits (e.g. high strength-to-weight ratio, sustainable characteristics and low cost). However, the literature on natural fibre-reinforced polymer composite adhesive joints is scarce and needs further investigation. The main objective of this study was to evaluate and compare the mechanical performance of adhesively bonded joints made of synthetic- and natural fibre-reinforced polymer composites. Similar and dissimilar single lap joints bonded with a modern tough structural adhesive used in the automotive industry, as well as the epoxy resin AR260 (the same resin used in composite fabrication) were tested. It was found that the average failure loads varied significantly with adhesive material strength and adherend stiffness. Furthermore, it was also observed that failure mode has a significant effect in failure load. The jute-based natural fibre composites joints, both hybrid and purely natural, were superior in strength compared to the sisal-based natural composites joints.

Protection of reinforced concrete beams retrofitted by carbon fibre-reinforced polymer composites against elevated temperatures

2010 ◽  
Vol 37 (9) ◽  
pp. 1171-1178 ◽  
Author(s):  
H. Elkady ◽  
A. Hasan
Keyword(s):  
Reinforced Concrete ◽  
Carbon Fibre ◽  
Fire Test ◽  
Elevated Temperatures ◽  
Concrete Beams ◽  
Reinforced Concrete Beams ◽  
Fire Tests ◽  
Reinforced Polymer ◽  
Carbon Fibre Reinforced Polymer ◽  
Fibre Reinforced Polymer

This paper presents the outcome of the first part of a 3 year project aiming to investigate the effect of elevated temperatures on carbon fibre-reinforced polymer (CFRP) retrofitted structures. Accordingly, different protecting mixes to be used as thermal insulating covers were proposed and evaluated. This experimental program addresses a series of indirect fire tests on reinforced concrete beams retrofitted with CFRP laminates exposed to a temperature of 900 °C (1652 °F) after being protected with ten types of special mortar covers. Materials known for their low coefficient of thermal conductivity were added in certain ratios to form mortars for these protective covers. Tests were carried out in a test furnace designed to produce the standard temperature–time curve specified in ASTM E119–95a. Scale effect was considered by proper adjustment of the exposure time to fire test. Temperature at the CFRP level, just below the protecting covers, was monitored to determine the efficiency of the covers in reducing heat transfer during the fire test. Furthermore, mechanical bending load tests were performed on specimens before and after fire tests to determine reduction in flexure failure load of the specimens due to indirect fire exposure. This reduction was found to vary from 10% to 48% for different tested coatings. In spite of the high damage in the protection covers expressing the lowest performance, reinforced concrete beams were still unaffected and could be restrengthened to return to their original status. Recommendations showing proper thicknesses of application and necessary precautions to be taken when using CFRP in retrofitting reinforced concrete structures to enhance their fire resistance were presented.

Effect of Post-Heated Concrete Cylinders Repaired with CFRP Reinforcement

2012 ◽  
Vol 626 ◽  
pp. 620-624
Author(s):  
Sharifah Salwa Mohd Zuki ◽  
J. Jayaprakash ◽  
Lee Kit Hock ◽  
Ong Chong Yong
Keyword(s):  
Carbon Fibre ◽  
Room Temperature ◽  
Elevated Temperatures ◽  
Axial Loading ◽  
Reinforced Polymer ◽  
Concrete Cylinders ◽  
Carbon Fibre Reinforced Polymer ◽  
Different Temperatures ◽  
Fibre Reinforced Polymer ◽  
Heated Concrete

This paper presents the experimental results of post-heated concrete cylinders repaired externally using Carbon Fibre Reinforced Polymer (CFRP) fabrics. Eighteen concrete cylinders of size 155mm x 300mm were exposed to different temperatures of 100, 200, and 300°C for 3 hours. Subsequently, the exposed concrete cylinders were naturally cooled down to room temperature and repaired externally using CFRP reinforcement. All these cylinders were tested to failure under axial loading. Results show that the residual strength of post-heated CFRP repaired concrete cylinders was significantly increased between 47 to 51% over the control cylinders. However, the ductility of CFRP repaired concrete cylinders was increased at the elevated temperatures.

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