scholarly journals Influence of Cutting Temperature on the Tensile Strength of a Carbon Fiber-Reinforced Polymer

Fibers ◽  
2017 ◽  
Vol 5 (4) ◽  
pp. 46 ◽  
Author(s):  
Jérémy Delahaigue ◽  
Jean-Francois Chatelain ◽  
Gilbert Lebrun
Keyword(s):  
Tensile Strength ◽  
Carbon Fiber ◽  
Cutting Temperature ◽  
Fiber Reinforced Polymer ◽  
Carbon Fiber Reinforced Polymer ◽  
Fiber Reinforced ◽  
Reinforced Polymer ◽  
Carbon Fiber Reinforced

scholarly journals Experimental investigation of the microstructures and tensile properties of polyacrylonitrile-based carbon fibers exposed to elevated temperatures in air

2019 ◽  
Vol 14 ◽  
pp. 155892501985001 ◽  
Author(s):  
Chenggao Li ◽  
Guijun Xian
Keyword(s):  
Tensile Strength ◽  
Carbon Fiber ◽  
Carbon Fibers ◽  
Elevated Temperatures ◽  
Tensile Modulus ◽  
Fiber Reinforced Polymer ◽  
Carbon Fiber Reinforced Polymer ◽  
Fiber Reinforced ◽  
Reinforced Polymer ◽  
Carbon Fiber Reinforced

The elevated temperature resistance and even fire resistance of carbon fiber-reinforced polymer composites were critical concerns in many applications. These properties of a carbon fiber-reinforced polymer depend not only on the degradation of the polymer matrix but also on that of the carbon fibers under elevated temperatures. In this study, influences of elevated temperatures (by 700°C for 30 min) in air on the mechanical properties and microstructures of a carbon fiber were investigated experimentally. It was found that the tensile strength and modulus as well as the diameters of the carbon fibers were reduced remarkably when the treatment temperatures exceeded 500°C. At the same time, the content of the structurally ordered carbonaceous components on the surface of carbon fibers and the graphite microcrystal size were reduced, while the graphite interlayer spacing ( d002) was enhanced. The deteriorated tensile modulus was attributed to the reduced graphite microcrystal size and the reduced thickness of the skin layer of the carbon fiber, while the degraded tensile strength was mainly attributed to the weakened cross-linking between the graphite planes.

Thermal characteristics of unidirectional carbon fiber reinforced polymer laminates during orthogonal cutting

2018 ◽  
Vol 37 (13) ◽  
pp. 905-916 ◽  
Author(s):  
Qinglong An ◽  
Jie Chen ◽  
Xiaojiang Cai ◽  
Tingting Peng ◽  
Ming Chen
Keyword(s):  
Carbon Fiber ◽  
Fiber Orientation ◽  
Cutting Temperature ◽  
Orientation Angle ◽  
Fiber Reinforced Polymer ◽  
Carbon Fiber Reinforced Polymer ◽  
Fiber Reinforced ◽  
Reinforced Polymer ◽  
Fiber Orientation Angle ◽  
Carbon Fiber Reinforced

Carbon fiber reinforced polymer has been used as a major material for primary load-bearing structural components in aviation industry. But its poor heat resistance is an important factor affecting the machining performance, because high cutting temperature above glass transition temperature of resin matrix (normally 300°C or below) may lead to the degradation of the resin matrix. In this study, orthogonal machining experiments were conducted to investigate the effects of cutting parameters, cutting tool geometric parameters, and material parameters on cutting temperature, and the prediction model of cutting temperature about fiber orientation angle ( θ) was built. Cutting temperature was measured by semiartificial thermocouple method. The experimental results revealed that the influence of cutting parameters on cutting temperature was not affected by fiber orientation angle of carbon fiber reinforced polymer. Cutting tool geometric parameters have little effect on cutting temperature. Unlike metal materials, cutting temperature was greatly influenced by θ. Cutting temperature for θ < 90° was significantly higher than that for θ > 90°. The maximum temperature occurred at θ = 90°. The influence of fiber orientation angle was shown in two aspects: changing the springback of unidirectional-carbon fiber reinforced polymer laminates in cutting process, changing material removal mechanism, which affected cutting temperature eventually.

Restoring Initially Cracked Reinforced Concrete Beams utilizing Carbon Fiber Reinforced Polymer Strips

2019 ◽  
Vol 7 (1) ◽  
pp. 30-34
Author(s):  
A. Ajwad ◽  
U. Ilyas ◽  
N. Khadim ◽  
Abdullah ◽  
M.U. Rashid ◽  
...  
Keyword(s):  
Carbon Fiber ◽  
Concrete Beams ◽  
Fiber Reinforced Polymer ◽  
Carbon Fiber Reinforced Polymer ◽  
Fiber Reinforced ◽  
Loading Test ◽  
Control Beam ◽  
Reinforced Polymer ◽  
Cfrp Sheet ◽  
Carbon Fiber Reinforced

Carbon fiber reinforced polymer (CFRP) strips are widely used all over the globe as a repair and strengthening material for concrete elements. This paper looks at comparison of numerous methods to rehabilitate concrete beams with the use of CFRP sheet strips. This research work consists of 4 under-reinforced, properly cured RCC beams under two point loading test. One beam was loaded till failure, which was considered the control beam for comparison. Other 3 beams were load till the appearance of initial crack, which normally occurred at third-quarters of failure load and then repaired with different ratios and design of CFRP sheet strips. Afterwards, the repaired beams were loaded again till failure and the results were compared with control beam. Deflections and ultimate load were noted for all concrete beams. It was found out the use of CFRP sheet strips did increase the maximum load bearing capacity of cracked beams, although their behavior was more brittle as compared with control beam.

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