The compressive behavior of a composite cylindrical pyramidal lattice structure manufactured with a new production methodology

2020 ◽  
Vol 234 (2) ◽  
pp. 222-231
Author(s):  
Masoud Mohammadi ◽  
Ali Sadeghi
Keyword(s):  
Carbon Fiber ◽  
Carrying Capacity ◽  
Volume Fraction ◽  
Lattice Structure ◽  
Fiber Composite ◽  
Load Carrying Capacity ◽  
Metal Mold ◽  
Carbon Fiber Composite ◽  
New Production ◽  
Load Carrying

In this paper, a new manufacturing method of pyramidal lattice cells has been suggested to produce lattice composite cylinders. Moreover, the effect of fiber volume fraction, vacuum molding, and fiber pre-tension has been investigated on the load-carrying capacity of the cylindrical pyramidal lattice structure of a carbon fiber composite. The carbon fiber composite cylindrical pyramidal lattice structure has been manufactured with laying fibers along the grooves of a silicone mold. Then, it has been subjected to the axial compressive test. Furthermore, to make pre-tension in fibers, a metal mold has been designed. Fiber pre-tension ensures the alignment of the fibers is straight between two nodal points. Additionally, the structure has been analyzed by the finite element buckling procedure. Experimental tests on the structures show that using a metal mold compare to the silicone molding method increases load-carrying capacity up to 48% without significantly varying the weight. Therefore, this method can be used for manufacturing pyramidal lattice structures in the hand layup process.

scholarly journals Long-term Application of Carbon Fiber Composite Cable Tendon in the Prestressed Concrete Bridge-Shinmiya Bridge in Japan

2018 ◽  
Vol 206 ◽  
pp. 02011 ◽  
Author(s):  
Hue Thi Nguyen ◽  
Hiroshi Masuya ◽  
Tuan Minh Ha ◽  
Saiji Fukada ◽  
Daishin Hanaoka ◽  
...  
Keyword(s):  
Carbon Fiber ◽  
Prestressed Concrete ◽  
Carrying Capacity ◽  
Fiber Composite ◽  
Concrete Bridge ◽  
Load Carrying Capacity ◽  
Carbon Fiber Composite ◽  
Destructive Test ◽  
Load Carrying ◽  
Prestressed Concrete Bridge

Carbon fiber reinforced plastic (Carbon Fiber Composite Cable, CFCC) has the outstanding features in comparison with regular steel. In October 1988, CFCC was applied as the tensioning material in main girders of new Shinmiya Bridge in Ishikawa, Japan. This was the first bridge in Japan and in the world, which CFCC tendons were used in the prestressed concrete bridge to counter salt damage. To investigate the serviceability and durability of the main girders and CFCC, three full-scale test girders were fabricated in 1988. At the same time, a bending experiment was conducted on one girder to investigate the ultimate behavior, load carrying capacity of the PC girder, as well the strain behavior of the CFCC. Besides, two PC girders were placed next to the main girders of the bridge in the same conditions. One of them was used for a destructive test after six years of the construction time (1994). In this study, another test specimen that was exposed to the actual corrosive environment after nearly 30 years was subjected to a destructive test by bending load. The load carrying capacity of the girder was clarified, and the durability of the PC girders using CFCC tendon was confirmed.

Rehabilitation of Strength of Steel Plate with a Corroding Hole Bonded by Composite Patches

2012 ◽  
Vol 226-228 ◽  
pp. 883-888
Author(s):  
Xiang Ming Zhang ◽  
Li Wei Chen ◽  
Ze Long You ◽  
Ming Yong Hu ◽  
Shao Hong Yang
Keyword(s):  
Failure Mode ◽  
Carrying Capacity ◽  
Present Method ◽  
Ultimate Load ◽  
Steel Plate ◽  
Fiber Composite ◽  
Load Carrying Capacity ◽  
Carbon Fiber Composite ◽  
Composite Patch ◽  
Load Carrying

The failure mode of steel plate with a center elliptic corroding hole double-sided adhesively bonded by carbon fiber composite patch is identified and studied, and analytical solution to load-carrying capacity of damaged steel plate bonded by composite patch is presented in this paper. Ultimate load of patched steel plate corresponding to each failure mode is derived and calculated respectively, the load carrying capacity of the patched plate is equal to the minimum value of these calculations. Yielding load when yielding occurs near the hole-edge of repaired structure from present method was compared to the results of ANSYS FEA, and the ultimate load of repaired plate from present method was compared to the test results. Results indicate: Repaired by bonded composite patch, static strength and loading carrying capacity of damaged steel plate or structures can be effectively restored. Yielding load and ultimate load of patched steel plate is visibly increased. The present analytical results have a good agreement with FEA and experimental results.

Electrical Resistance Properties of Cement/Carbon Fiber Composite

2012 ◽  
Vol 560-561 ◽  
pp. 830-836 ◽  
Author(s):  
Bi Qin Dong ◽  
Feng Xing ◽  
Hong Zhi Cui ◽  
Zong Jin Li
Keyword(s):  
Carbon Fiber ◽  
Electrical Resistance ◽  
Fiber Volume Fraction ◽  
Volume Fraction ◽  
Fiber Composite ◽  
Cement Composite ◽  
Carbon Fiber Composite ◽  
Fiber Volume ◽  
Study Results ◽  
Short Carbon

In this article, study results of the electrical resistance properties of cement/carbon fiber composite are presented. Using a normal mixing and compacting method, up to 0.85v.% short carbon fiber can be easily incorporated into the cement composite. And its electrical resistivity properties are measured. The resistivity of specimens decreases greatly with the volume fraction of fibers increasing. Moreover, it is found that there is a saturation point for fiber volume fraction. Beyond that, the change of resistivity with the variation of fiber volume fraction becomes much flat. Another interest finding is that the resistivity of the cement materials is a function of frequency of applied voltage. The microstructure associated with the electrical properties of composite is observed. It is possible to apply cement/carbon fiber composite as an electromagnetic shielding composite and so on.

The Application of CFRP Reinforcement Scheme in a Overpass Bridge Reinforcement Engineering

2013 ◽  
Vol 753-755 ◽  
pp. 520-524
Author(s):  
Xin Zhao
Keyword(s):  
Stress State ◽  
Carbon Fiber ◽  
Carrying Capacity ◽  
Shear Load ◽  
Load Carrying Capacity ◽  
Flexural Capacity ◽  
Reinforcement Scheme ◽  
Load Carrying ◽  
Before And After ◽  
Carbon Fiber Polymer

Taking a flyover as the background, this paper compares two reinforcement scheme, and ultimately chooses the paste carbon fiber polymer method to reinforce the bridge. It calculates and analyzes the structure before and after the reinforcement, then compares the stress state , shear load-carrying capacity and flexural capacity. At last ,it evaluates the effect of the paste carbon fiber polymer method and puts forward some suggestions.

scholarly journals Manufacturing and Performance Evaluation of Carbon Fiber–Reinforced Honeycombs

2019 ◽  
Vol 3 (1) ◽  
pp. 13 ◽  
Author(s):  
Sanjeev Rao ◽  
Jimmy Thomas ◽  
Alia Aziz ◽  
Wesley Cantwell
Keyword(s):  
Performance Evaluation ◽  
Carbon Fiber ◽  
Energy Absorption ◽  
Carrying Capacity ◽  
Load Carrying Capacity ◽  
Fiber Reinforced ◽  
Static Compression ◽  
Epoxy Resin System ◽  
Load Carrying ◽  
Carbon Fiber Reinforced

In this work, the manufacturing characteristics and a performance evaluation of carbon fiber–reinforced epoxy honeycombs are reported. The vacuum-assisted resin transfer molding process, using a central injection point, is used to infuse a unidirectional dry slit tape with the epoxy resin system Prime 20 LV in a wax mold. The compression behavior of the manufactured honeycomb structure was evaluated by subjecting samples to quasi-static compression loading. Failure criteria for the reinforced honeycombs were developed and failure maps were constructed. These maps can be used to evaluate the reliability of the core for a prescribed loading condition. Improvements in the load-carrying capacity for the reinforced samples, as compared with unreinforced specimens, are discussed and the theoretical predictions are compared with the experimental data. The compression test results highlight a load-carrying capacity up to 26 kN (~143 MPa) for a single hexagonal cell (unit cell) and 160 kN (~170 MPa) for cores consisting of 2.5 × 3.5 cells. The failure map indicates buckling to be the predominant mode of failure at low relative densities, shifting to cell wall fracture at relative densities closer to a value of 10−1. The resulting energy absorption diagram shows a monotonic increase in energy absorption with the increasing t/l ratio of the honeycomb core cell walls.

scholarly journals Evaluation of Load Carrying Capacity of Hydrodynamic Journal Bearing with Nanolubricants

10.29007/pq98 ◽  
2018 ◽  
Author(s):  
Tushar Gundarneeya ◽  
Dipak Vakharia
Keyword(s):  
Carrying Capacity ◽  
Journal Bearing ◽  
Volume Fraction ◽  
Classical Model ◽  
Viscosity Model ◽  
Load Carrying Capacity ◽  
Base Oil ◽  
Lubricant Oil ◽  
Load Carrying ◽  
Hydrodynamic Journal Bearing

In this work, influence of nanolubricants on the load carrying capacity of hydrodynamic journal bearing is studied. Increase in viscosity of lubricant oil with nanopartical as lubricant additives is modeled using different classical model and compared with Kriger-Doughetry viscosity model. This Kriger-Doughetry viscosity model for simulating viscosity of nanolubricant is validated by Experimental verification using reheometer. The pressure distribution and load carrying capacity are theoretically analyzed using Reynolds Equation for Reynolds boundary condition for different concentration of nanoparticles volume fraction. Result reveal increase in pressure and load carrying capacity of Journal bearing with nanolubricants in comparison to base oil.

scholarly journals Behavior of Simply Supported Concrete Beam Using CFRP (Carbon Fiber Reinforced Polymer)

2021 ◽  
Vol 1197 (1) ◽  
pp. 012033
Author(s):  
Akshay Shivankar ◽  
K.R. Dabhekar ◽  
P.B. Patil ◽  
D.P. Mase ◽  
I.P. Khedikar
Keyword(s):  
Carbon Fiber ◽  
Flexural Strength ◽  
Double Layer ◽  
Carrying Capacity ◽  
Concrete Beam ◽  
Single Layer ◽  
Load Carrying Capacity ◽  
Load Carrying ◽  
Cfrp Composite ◽  
Ultimate Load Carrying Capacity

Abstract The aim of this paper is to study the behavior of beam with the use of CFRP composite by experimentally and by ANSYS and compare both the results and compare load carrying capacity. For experimentally we cast Nine no’s of beam of size 100×100×400 mm, of M30 grade of concrete and curing for 7 days and after 7 days curing we conduct UPV test and find homogeneity of concrete beam and decided carbon fiber wrapping techniques we create two set of beam with 230 GSM wrapped with double layer and two set of beam with 430 GSM wrapped with double layer and two set of beam with 430 GSM wrapped with single layer, and 3 control beams without wrapping and test for flexural strength and by this test we observe the ultimate load carrying capacity and flexural strength of carbon fiber wrapped beam is increased as compare to control beams.

A Comparison on Column Reinforcement with Conventional Concrete and Carbon Fiber / Epoxy Exposed to Compression Loading

2020 ◽  
Vol 305 ◽  
pp. 85-90
Author(s):  
Faruk Elaldi ◽  
Batuhan Ciloglu ◽  
Yasin Yanikkaya
Keyword(s):  
Carbon Fiber ◽  
Axial Compression ◽  
Compression Test ◽  
Carrying Capacity ◽  
Concrete Columns ◽  
Load Carrying Capacity ◽  
Conventional Concrete ◽  
Load Carrying ◽  
Epoxy Material ◽  
Carbon Fiber Epoxy

There are lots of concrete columns and beams around in our living cities. Those items are mostly open to aggressively environmental conditions. Mostly, they are deteriorated by sand wind, humidity and other external applications. After a while these beam and columns need to be repaired. Within the scope of this study, for reinforcement of concrete columns, samples were designed and fabricated to be strengthened with carbon fiber reinforced composite materials and conventional concrete encapsulation and followed by, they were put into the axial compression test to determine load carrying performance before column failure. In the first stage of this study, concrete column design and mold designs were completed for a certain load carrying capacity. Later, the columns were exposed to environmental deterioration in order to reduce load carrying capacity. To reinforce these damaged columns, two methods were applied, the one “concrete encapsulation” and the other one “wrapping with carbon fiber /epoxy” material. In the second stage of the study, the reinforced columns were applied to axial compression test and the results obtained were analyzed. Cost and load carrying performance comparisons were made and it is found that even though carbon fiber/epoxy reinforced method is more expensive, this method enhances higher load carrying capacity and reduces reinforcement processing period.

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