Temperature Variations in Drilling of CFRP/Aluminum and CFRP/Titanium Stacks

2016 ◽  
Vol 10 (3) ◽  
pp. 348-355 ◽  
Author(s):  
Masahiko Sato ◽  
◽  
Hisataka Tanaka ◽  
Kanae Yamamoto ◽  
Keyword(s):  
Optical Fiber ◽  
Thermal Damage ◽  
Initial Temperature ◽  
Bottom Surface ◽  
Radiation Pyrometer ◽  
Temperature Variations ◽  
Fiber Reinforced Plastic ◽  
Reinforced Plastic ◽  
Infrared Rays ◽  
Very High

This paper describes the temperature variations observed in the drilling of carbon fiber-reinforced plastic (CFRP)/Al, CFRP/Ti, Al/CFRP, and Ti/CFRP stacks. An infrared radiation pyrometer equipped with an optical fiber was used to measure the temperature. The optical fiber, inserted into the oil hole of an internal-coolant carbide drill, registered the infrared rays radiating from the bottom surfaces of the drilled holes. In drilling the CFRP/Ti stack, the temperature was ∼95°C in the CFRP layer. As the drill progressed into the Ti layer, the temperature increased to a very high value of 745°C at the bore exit. In the Ti/CFRP stack, meanwhile, the initial temperature was ∼170°C and increased to 695°C at the Ti/CFRP interface. Severe thermal damage, including fiber/resin pullout and matrix degradation, was caused by the heat at the bottom surface of the drilled hole in the Ti/CFRP stack. Along the edge of the entry point in the CFRP, the CFRP matrix was degraded by the heat. In drilling the CFRP/Al stack, the temperature in the Al layer was 200°C; little thermal damage was observed.

Surface Quality and Dust Analysis in High Speed Trimming of CFRP

2012 ◽  
Vol 232 ◽  
pp. 57-62 ◽  
Author(s):  
Madjid Haddad ◽  
Redouane Zitoune ◽  
Florent Eyma ◽  
Bruno Castanié ◽  
Habiba Bougherara
Keyword(s):  
Surface Quality ◽  
High Speed ◽  
Cutting Parameters ◽  
Carbon Fiber Reinforced Plastic ◽  
Machining Parameters ◽  
Fiber Reinforced Plastic ◽  
Pulmonary Alveoli ◽  
Reinforced Plastic ◽  
Chip Size ◽  
Very High

In this work, high speed trimming of a multi directional carbon fiber reinforced plastic using a tungsten carbide burr tool is studied. The influence of the machining parameters on both the dust size and surface quality is investigated. A high percentage of dust is found under the theoretical chip size and the surface quality is found to be affected by the cutting parameters. The percentage of inhaled dust reaching the pulmonary alveoli is quantified and found to be very high, it is also found that this percentage is affected by the cutting conditions.

Experimental Response of RC Beams Strengthened in Shear by FRP Sheets

2013 ◽  
Vol 7 (1) ◽  
pp. 127-135 ◽  
Author(s):  
E. Grande ◽  
M. Imbimbo ◽  
A. Rasulo
Keyword(s):  
Slenderness Ratio ◽  
Shear Capacity ◽  
Rc Beams ◽  
Fiber Reinforced Plastic ◽  
Frp Composites ◽  
Reinforced Plastic ◽  
Externally Bonded ◽  
Experimental Response ◽  
Transverse Steel ◽  
Cracking Pattern

The paper discusses the results of an experimental investigation carried out on reinforced concrete (RC) beams strengthened in shear by externally bonded fiber reinforced plastic (FRP) sheets. The study is devoted to analyze the role that the transverse steel reinforcement and the beam slenderness ratio could play on the resistant mechanism of RC beams strengthened in shear by FRP composites. The results are summarized and analyzed in detail in the paper in terms of shear capacity, cracking pattern and shear resisting contribution of FRP.

scholarly journals Stressing State Analysis of Reinforced Concrete Beam Strengthened by CFRP Sheet with Anchoring Device

Materials ◽  
2021 ◽  
Vol 14 (3) ◽  
pp. 576
Author(s):  
Liang Luo ◽  
Jie Lai ◽  
Jun Shi ◽  
Guorui Sun ◽  
Jie Huang ◽  
...  
Keyword(s):  
Carbon Fiber ◽  
Strain Distribution ◽  
Carbon Fiber Reinforced Plastic ◽  
Rc Beams ◽  
Fiber Reinforced ◽  
Strain Distribution Pattern ◽  
Fiber Reinforced Plastic ◽  
Reinforced Plastic ◽  
Cfrp Sheet ◽  
Carbon Fiber Reinforced

This paper investigates the working performance of reinforcement concrete (RC) beams strengthened by Carbon-Fiber-Reinforced Plastic (CFRP) with different anchoring under bending moment, based on the structural stressing state theory. The measured strain values of concrete and Carbon-Fiber-Reinforced Plastic (CFRP) sheet are modeled as generalized strain energy density (GSED), to characterize the RC beams’ stressing state. Then the Mann–Kendall (M–K) criterion is applied to distinguish the characteristic loads of structural stressing state from the curve, updating the definition of structural failure load. In addition, for tested specimens with middle anchorage and end anchorage, the torsion applied on the anchoring device and the deformation width of anchoring device are respectively set parameters to analyze their effects on the reinforcement performance of CFRP sheet through comparing the strain distribution pattern of CFRP. Finally, in order to further explore the strain distribution of the cross-section and analyze the stressing-state characteristics of the RC beam, the numerical shape function (NSF) method is proposed to reasonably expand the limited strain data. The research results provide a new angle of view to conduct structural analysis and a reference to the improvement of reinforcement effect of CFRP.

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