Mechanical and Fracture Mechanical Properties of Matrix-Reinforced Carbon Fiber Composites with Carbon Nanotubes

2019 ◽  
Vol 809 ◽  
pp. 615-619 ◽  
Author(s):  
Gerhard Sinn ◽  
Gerald Singer ◽  
Leo Jocher ◽  
Miriam M. Unterlass ◽  
Harald Rennhofer ◽  
...  
Keyword(s):  
Carbon Fiber ◽  
High Strength ◽  
Negative Influence ◽  
Carbon Fiber Composites ◽  
Bending Tests ◽  
Reinforced Plastics ◽  
Aerospace Applications ◽  
Four Point Bending ◽  
Low Weight ◽  
Strength And Stiffness

Carbon fiber reinforced Plastics are materials with high strength and stiffness at low weight compared to metals. These properties make the materials ideal candidate for structures in aerospace applications, where they are often used under bending conditions. Due to the strongly anisotropic composition the CFRP typically fail in compression by fiber buckling. In order to improve this weakness, nanotube and nanofiber reinforced matrix was used to build CFRP. Four-point bending tests showed that stiffness and strength could be improved by the fillers, whereas negative influence was found on fracture energy.

Bending properties of carbon fiber nanocomposites with lamination structure of reinforcement

2016 ◽  
Vol 36 (5) ◽  
pp. 481-487 ◽  
Author(s):  
Jun Hee Song
Keyword(s):  
Mechanical Properties ◽  
Carbon Fiber ◽  
Fiber Composites ◽  
Advanced Materials ◽  
Carbon Fiber Composites ◽  
Reinforced Composites ◽  
Bending Tests ◽  
Reinforced Plastics ◽  
Composite Samples ◽  
Vartm Process

Abstract Advanced materials with excellent performance are in high demand in modern industry. Carbon fiber composites offer a number of advantageous mechanical properties. A significant improvement in fiber-reinforced composites can be achieved by dispersing a very small amount of nanofiller in the resin. Vacuum-assisted resin transfer molding (VARTM) is one of the most important processes for producing reinforced plastics. In this work, several composite samples were fabricated with the infusion of carbon nanofibers (CNFs) into the epoxy matrix using VARTM process. Using scanning electron microscopy (SEM), it was confirmed that CNFs were well dispersed in the resin. Bending tests were performed to investigate the mechanical properties of the samples, and SEM, to examine the fracture surfaces.

scholarly journals Drilling of Fibre Reinforced Plastic Laminates

2008 ◽  
Vol 587-588 ◽  
pp. 706-710 ◽  
Author(s):  
Luís Miguel P. Durão ◽  
A.G. Magalhães ◽  
António Torres Marques ◽  
A.M. Baptista ◽  
M. Figueiredo
Keyword(s):  
High Strength ◽  
Machining Process ◽  
Test Results ◽  
Reinforced Plastics ◽  
Reinforced Plastic ◽  
Low Weight ◽  
Load Carrying ◽  
Hybrid Laminates ◽  
Sporting Goods ◽  
Strength And Stiffness

The use of fibre reinforced plastics – FRP’s – in structures is under a considerable increase. Advantages of their use are related with their low weight, high strength and stiffness. The improvement of the dynamic characteristics has been profitable for aeronautics, automobile, railway, naval and sporting goods industries. Drilling is a widely used machining technique as it is needed to assemble parts in a structure. This is a unique machining process, characterized by the existence of two different mechanisms: extrusion by the drill chisel edge and cutting by the rotating cutting lips. Drilling raises particular problems that can reduce mechanical and fatigue strength of the parts. In this work, quasi-isotropic hybrid laminates with 25% of carbon fibre reinforced plies and 4 mm thickness are produced, tested and drilled. Three different drill geometries are compared. Results considered are the interlaminar fracture toughness in Mode I – GIc –, thrust force during drilling and delamination extent after drilling. A bearing test is performed to evaluate tool influence on the load carrying capacity of the plate. Results consider the influence of drill geometry on delamination. A correlation linking plate damage to bearing test results is presented.

Strengthening of Reinforced Concrete Beams by Carbon Fiber Composites

2018 ◽  
Vol 931 ◽  
pp. 379-384
Author(s):  
Yuri V. Ivanov ◽  
Yuri F. Rogatnev ◽  
Igor I. Ushakov
Keyword(s):  
Reinforced Concrete ◽  
Carbon Fiber ◽  
Bearing Capacity ◽  
Concrete Beams ◽  
Reinforced Concrete Beams ◽  
Carbon Fiber Composites ◽  
Limiting State ◽  
Reinforced Plastics ◽  
Reinforced Beams ◽  
The Given

The paper considers the results of the experimental study of the reinforced concrete beams strengthened by carbon fiber reinforced plastics (the CFRP). Eight reinforced concrete beams of the 80x160 mm section and 1500 mm designed span have been manufactured and tested. The influence of the number of the CFRP layers (strengthening power) on bearing capacity and rigidity under the static loading of beams in the thirds of the span has been studied. The results obtained indicate the increase in bearing capacity of the reinforced beams from 24% up to 55% and the increase in rigidity by 45% for the commonly adopted limiting state, i.e. achieving ultimate deformations in concrete of the compressed zone). The paper underlines the need for using anchor devices in the form of U-shaped binders to ensure the efficiency of the given method of strengthening.

scholarly journals Performance analysis of the bump beams made of High Strength Steel and Carbon Fiber reinforce plastics

2018 ◽  
Vol 207 ◽  
pp. 03006
Author(s):  
Yi Yao ◽  
Quan Yuan ◽  
Sihuan Fu
Keyword(s):  
Carbon Fiber ◽  
Automobile Industry ◽  
High Strength Steel ◽  
Lightweight Design ◽  
High Strength ◽  
Research Directions ◽  
Deformation And Failure ◽  
Reinforced Plastics ◽  
Fiber Reinforced Plastics ◽  
Fiber Reinforce

Lightweight and safe are the key research directions of the automobile industry. Bump beam is an important part of the car safety protection and it’s lightweight design has drawn much attention. In this paper, the static strength and the low-speed impact performances of two types of bump beam with the same structure, which made of carbon fiber reinforced plastics (CFRP) and high strength steel (HSS), were investigated. Under the condition of static press, frontal and 40% offset impact, part structural stiffness, component crush intrusion, energy absorption were comparison analyzed. In order to guide the product design, the deformation and failure of CFRP beams with five different laminate structures were simulated under frontal and 40% offset impact. The results indicate that, with the same structure, the properties of CFRP bump beam are generally superior to HSS product, more conducive to lightweight and the optimum design of the laminate is [0° / 60° / 120°]

Flexural properties of notched carbon–aramid hybrid composite laminates

2019 ◽  
Vol 53 (28-30) ◽  
pp. 4137-4148 ◽  
Author(s):  
TA Sebaey ◽  
Ahmed Wagih
Keyword(s):  
Hybrid Composite ◽  
Composite Laminates ◽  
High Sensitivity ◽  
Flexural Properties ◽  
Bending Tests ◽  
Specific Strength ◽  
Four Point Bending ◽  
Hybrid Laminates ◽  
Minimal Damage ◽  
Strength And Stiffness

Hybrid composite laminates are currently receiving researchers’ attention due to their specific advantages in designing laminates with improved specific strength and stiffness. One of the main disadvantages of polymeric laminated composites is their high sensitivity to notches, which cannot be avoided in design. This paper presents a comparison between two common hybridization techniques, namely sandwich and intra-ply hybridization. The study adopts experimental observations to investigate the influence of hybridization method on the flexural properties of notched carbon–aramid hybrid laminates. After four-point bending tests, the results show that the damage nature in both laminates is different. A catastrophic damage is observed for intra-ply hybrid laminates, while sandwich laminates show progressive damage. In terms of the strength, sandwich specimens show 1.3 times higher specific strength, compared to intra-ply specimens. Moreover, the bottom layers of the laminate manufactured in the sandwich fashion show minimal damage due to the high capability of the aramid/epoxy core to absorb the energy in deformation and concentrate the damage at the top layers (the compression side).

scholarly journals Simplified Material Solution for Orthotropic Symmetrical GFRP Laminates for Structural Facades

2019 ◽  
Vol 2019 ◽  
pp. 1-15
Author(s):  
Yuchao Zhao ◽  
Xu Jiang ◽  
Qilin Zhang ◽  
Xuhong Qiang
Keyword(s):  
Design Theory ◽  
High Strength ◽  
Fiber Reinforced Polymer ◽  
Free Form ◽  
Reinforced Polymer ◽  
Glass Fiber Reinforced ◽  
Complex Design ◽  
Low Weight ◽  
Strength And Stiffness ◽  
Material Solution

GFRP (glass-fiber-reinforced polymer), as a composite material, possesses many favorable properties including high strength and low weight and is amenable to unique processing methods; therefore, it is a potential free-form surface material. However, the complex design theory owing to anisotropy limits its application. Thus, a simplified material solution becomes significant. In this study, the strength and stiffness of orthotropic symmetrical GFRP laminates are derived theoretically, and a simplified material solution is proposed to simplify the anisotropy as isotropy. Then, using the numerical simulation of an actual orthotropic symmetrical GFRP laminate free-form facade structure, the effectiveness of the simplified material solution is analyzed and evaluated. This solution can provide guidance for similar GFRP facades and further promote the application of GFRP in engineering.

scholarly journals Failure Mechanisms of Sisal Fibres in Composites

1999 ◽  
Vol 8 (1) ◽  
pp. 096369359900800 ◽  
Author(s):  
S. L. Bai ◽  
C. M.L. Wu ◽  
Y.-W. Mai ◽  
H. M. Zeng ◽  
R. K. Y. Li
Keyword(s):  
Epoxy Matrix ◽  
Fibre Bundle ◽  
Failure Mechanisms ◽  
High Strength ◽  
Matrix Interface ◽  
Sisal Fibre ◽  
Bending Tests ◽  
Bonding Material ◽  
Four Point Bending ◽  
Scanning Electron

Model specimens, each containing five embedded continuous sisal fibres in an epoxy matrix, were subjected to four-point bending tests. The micro-failure behaviour of sisal fibres was examined using scanning electron microscopy (SEM). Interfacial debonding of both sisal fibre bundle/epoxy matrix and tubular micro-fibre/bonding material was also noted in all embedded fibres. The fibre bundle/matrix interface had a moderate high strength; but the adhesive strength between the micro-tubular fibre and the bonding material appeared to be small.

Numerical Analysis on Mechanical Properties of Beams Reinforced by CFRP Laminates

2015 ◽  
Vol 744-746 ◽  
pp. 196-200
Author(s):  
Ning Zhuang ◽  
Hao Dong Sun ◽  
Song Ge
Keyword(s):  
Large Scale ◽  
Growth Failure ◽  
High Strength ◽  
Test Results ◽  
Cfrp Laminates ◽  
Fiber Reinforced Plastic ◽  
Four Point Bending ◽  
Reinforced Plastic ◽  
Low Weight ◽  
Cfrp Sheet

Carbon Fiber Reinforced Plastic (CFRP) has been widely used in large-scale concrete infrastructure’s reinforcement and renovation because of its low weight and high strength, which promotes CFRP application in the field of civil engineering. This paper two aged beams reinforced by CFRP sheet was loaded to failure in four-point bending by laboratory experiment. Then the numerical model was built to simulate the destruction process and compared with test results. Based on the studying of this paper, the changing law of beam’s stress, ultimate bearing capacity growth, failure mode and cracking propagation was investigated during the loading process. The research has guiding significance for the design and construction of concrete structures reinforced by CFRP laminates.

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