PARAMETRIC STUDY ON COMPOSITE BEAMS STRENGTHENED WITH PRESTRESSED CFRP PLATES AND TENDONS

2021 ◽  
pp. 5379-5398
Author(s):  
Lamies Elgholmy, Hesham M. Fawzy, Abdallah Salama
Keyword(s):  
Carbon Fiber ◽  
Composite Beam ◽  
Element Model ◽  
Load Level ◽  
Fiber Reinforced Polymer ◽  
Carbon Fiber Reinforced Polymer ◽  
Fiber Reinforced ◽  
Shear Connection ◽  
Reinforced Polymer ◽  
Carbon Fiber Reinforced

Advanced carbon fiber reinforced polymer material (CFRP) has been widely used for strengthening structures. This paper aims to improve the ultimate capacity and stiffness of the composite beam externally strengthened with pre-stressed carbon fiber reinforced polymer plate by using CFRP tendons. The models were presented by 3-D FEM (finite element model) using ANSYS program to investigate the performance of composite beam which validated with experimental results presented. Various parametric studies achieved as degree of pre-stress level of CFRP tendons, tendon profile, degree of shear connection, the most effective beam load level to add CFRP tendons. Finally, the optimum strengthening conditions for the composite beam were studied.

Effect of transverse clamping force on the tensile behavior of a novel pultruded carbon fiber–reinforced polymer joint: Fatigue test

2019 ◽  
Vol 23 (7) ◽  
pp. 1413-1422
Author(s):  
Jiangang Gao ◽  
Qilin Zhao ◽  
Jinchun Liu ◽  
Li Chen
Keyword(s):  
Fatigue Life ◽  
Carbon Fiber ◽  
Fatigue Behavior ◽  
Load Level ◽  
Fiber Reinforced Polymer ◽  
Carbon Fiber Reinforced Polymer ◽  
Clamping Force ◽  
Fiber Reinforced ◽  
Reinforced Polymer ◽  
Carbon Fiber Reinforced

A novel pultruded carbon fiber–reinforced polymer connection technique for civil engineering that is called pre-tightened single tooth joint has been proven to have good static properties. To investigate the fatigue behavior of the joint, a series of laboratory experiments were carried out. The effects of load level and transverse clamping force on the fatigue behavior were estimated. Experimental results of this work implied that a fatigue life of 1 million as the maximum cyclic load is equal to approximately 83% of the static tensile ultimate bearing capacity. The transverse clamping force could slow down the propagation rate of fatigue crack and significantly improve the fatigue life. Based on the analysis of the hysteresis loops, a small increase in stiffness during the initial loading stage and only about 1%–4% stiffness degradation until fracture were found.

Theoretical modeling and experimental verification of co-curing carbon fiber-reinforced polymer hat-stiffened panels with silicone airbag male mandrels

2020 ◽  
pp. 096739112092164
Author(s):  
Shuai Zhu ◽  
Wenfei Peng
Keyword(s):  
Finite Element ◽  
Carbon Fiber ◽  
Element Model ◽  
Fiber Reinforced Polymer ◽  
Carbon Fiber Reinforced Polymer ◽  
Fiber Reinforced ◽  
Stiffened Panels ◽  
Reinforced Polymer ◽  
New Process ◽  
Carbon Fiber Reinforced

For closed-hole panels such as hat-stiffened panels, it is inevitable to use mandrels during the manufacturing process. However, the uniformity of pressure transmission of the silicone rubber mandrel with the prefabricated hole is not good, the vacuum bag mandrel is easy to be broken and wrinkled, the water-soluble mandrel is high in cost, and the invar steel metal mandrel is difficult to demold. To solve these problems, this article proposed a new method for co-curing carbon fiber-reinforced resin matrix composite hat-stiffened panels by using a silicone airbag as a mandrel through autoclaves. Firstly, the thermo-force-flow multi-field coupling finite element model of co-curing carbon fiber-reinforced polymer (CFRP) hat-stiffened panels was established by using finite element software. The co-curing process of hat-stiffened panels was simulated and studied. The influence of different thickness of silicone airbag mandrels on the wall thickness and pressure of the workpiece were found to be relatively uniform in the new process. Then, the autoclave experiment was carried out to verify the correctness of the finite element model. Lastly, the interfacial bonding strength test was carried out to verify the mechanical properties of the parts. In summary, the practicability of co-curing CFRP hat-stiffened panels with silicone airbag male mandrels was proved in this article. The precision of CFRP hat-stiffened panel was efficiently promoted by this new process.

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.

High thermal conductivity carbon fiber reinforced polymer based on a carbon fiber from pitch and dispersed-filled ENPB matrix

2018 ◽  
pp. 130-137
Author(s):  
E. A. Nikolaeva ◽  
A. N. Timofeev ◽  
K. V. Mikhaylovskiy
Keyword(s):  
Thermal Conductivity ◽  
Carbon Fiber ◽  
High Thermal Conductivity ◽  
Fiber Reinforced Polymer ◽  
Carbon Fiber Reinforced Polymer ◽  
Carbon Powder ◽  
Fiber Reinforced ◽  
Thermophysical Characteristics ◽  
Reinforced Polymer ◽  
Carbon Fiber Reinforced

This article describes the results of the development of a high thermal conductivity carbon fiber reinforced polymer based on carbon fiber from pitch and an ENPB matrix modified with a carbon powder of high thermal conductivity. Data of the technological scheme of production and the results of determining the physicomechanical and thermophysical characteristics of carbon fiber reinforced polymer are presented. 

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