The Study of a New Concept of Flexible Pipe With Carbon Fiber/Epoxy Reinforced Inner Sheath

2017 ◽  
Author(s):  
Chongyao Zhou ◽  
Zhiming Huang ◽  
Yongtian Kang ◽  
Dagang Zhang ◽  
Naiquan Ye ◽  
...  
Keyword(s):  
Composite Material ◽  
Carbon Fiber ◽  
Laminated Composite ◽  
Flexible Pipe ◽  
Inner Pressure ◽  
Offshore Industry ◽  
Pressure Resistance ◽  
Steel Weight ◽  
Carbon Fiber Epoxy ◽  
Fea Analysis

Flexible pipe has been widely used in offshore industry for many years. The traditional composite structure of flexible pipe consists of many layers, including multiple metallic layers, such as tensile armor, pressure armor and carcass, as well as nonmetallic layers, such as sheath and liner. Typical flexible pipe is heavy and requires complex manufacturing process, especially pressure armor and carcass manufacturing. Therefore, there is a desire to find a replacement to pressure armor and carcass. With the recent development of a new composite material with lighter weight and higher strength, it now becomes possible. This new composite material is called epoxy compounded carbon fiber (EP/CF). Carbon fiber is 10 times stronger than steel, while it is only 1/5 of the steel weight. Epoxy protects carbon fiber from environmental conditions such as high temperature and corrosion, also bond carbon fiber together and help to redistribute the loading between carbon fibers. This paper is to present a new concept of flexible pipe by applying the EP/CF material to flexible design. In this new flexible concept, EP/CF is used to strengthen the inner sheath by surface activation treatment of sheath material. This provides excellent hoop strength to resist the inner pressure, hence provides a good replacement to the pressure armor and carcass. A new FEA analysis method with ABAQUS is also presented in this paper. In the analysis approach, all helix fibers are modelled using predefined beam element, and EP/CF reinforced inner sheath is modeled using laminated composite shell. Nonlinear FEA analysis is carried out in ABAQUS to investigate the tension and bending behavior of flexible pipe with reinforced inner sheath, including the performance of inner pressure resistance, which is one of the key performances. Analysis is also carried out to study the benefit of using EP/CF on outer sheath reinforcement for collision protection. Lastly, the economics and feasibility of this concept are discussed, and conclusions are drawn.

scholarly journals Numerical evaluation of the elastic properties of carbon fiber reinforced composite material at elevated and lowered temperatures

2021 ◽  
Vol 53 (1) ◽  
pp. 127-136
Author(s):  
Alteer Saleem ◽  
Veljko Petrovic ◽  
Aleksandar Grbovic ◽  
Jasmina Lozanovic-Sajic ◽  
Igor Balac
Keyword(s):  
Composite Material ◽  
Carbon Fiber ◽  
Elastic Properties ◽  
Composite Structures ◽  
Thermal Stresses ◽  
Epoxy Composite ◽  
Laminated Composite ◽  
Laminated Composite Structures ◽  
Multi Phase ◽  
Carbon Fiber Epoxy

The effect of elevated and lowered temperatures on the elastic properties of carbon fiber-epoxy composite material was studied using multi-phase unit cell (MPUC) numerical model. Evaluation of the elastic properties of carbon fiber-epoxy composite material is based on the finite element method. Obtained results confirmed that elevated and lowered temperature has noticeable influence on elastic properties of carbon fiber-epoxy composite material. As demonstrated, this fact has considerable influence on accurate evaluation of generated thermal stresses in real laminated composite structures, exposed to extremely high or low operating temperatures.

scholarly journals SIMULASI PENGARUH ORIENTASI SUDUT SERAT TERHADAP TEGANGAN TARIK LAMINATED COMPOSITE

2021 ◽  
Vol 4 (01) ◽  
pp. 07-12
Author(s):  
Hilmi Iman Firmansyah ◽  
Sulistyono Sulistyono ◽  
Hangga Wicaksono
Keyword(s):  
Tensile Strength ◽  
Composite Material ◽  
Carbon Fiber ◽  
Maximum Stress ◽  
Laminated Composite ◽  
Carbon Fiber Composites ◽  
Maximum Deformation ◽  
Fiber Angle ◽  
The Matrix ◽  
Angle Orientation

Composite is a material consisting of a mixture or combination of two or more materials, either micro or macro, where the properties of the material are different in shape and chemical composition from the original substance. In this study, the composite was tested to determine the tensile strength using simulation. Composite material modeling consists of carbon fiber as reinforcement and epoxy resin as the matrix. Then the composite material was given a uniaxial loading with a loading value of 50 N. By using variations in the orientation of the fiber angle 45ᵒ/90ᵒ/-45ᵒ, 45ᵒ/90ᵒ/-45ᵒ and 60ᵒ/45ᵒ/-60ᵒ. This study aimed to determine the effect of fiber angle orientation on tensile strength, maximum deformation and location of maximum stress on carbon fiber composites. The best composite design is the composite with fiber angle orientation of 45ᵒ/90ᵒ/-45ᵒ with a tensile stress value of 3.6 MPa and the smallest deformation of 0.0644 mm.

Research About Key Factors in Jet Puncturing Process for Multilayer Composite Material

2014 ◽  
Author(s):  
Yiyong Yao ◽  
Liping Zhao ◽  
Sheng Hu ◽  
Rongya Zhou ◽  
Mei Zheng
Keyword(s):  
Composite Material ◽  
Carbon Fiber ◽  
Laminated Composite ◽  
Fluid Simulation ◽  
Carbon Cloth ◽  
Multilayer Composite ◽  
High Modulus ◽  
Key Factors ◽  
Molding Process ◽  
Multilayer Composite Material

In the traditional molding process of laminated carbon fiber reinforced C/C composites - preform, it always causes great damage to a high modulus carbon fiber. Research about key factors for jet puncture in multilayer composite material is proposed in this paper. With the method, carbon fiber is added into the laminating direction of high-modulus carbon cloth by using jet method, so the preform is combined together to improve interlayer fiber connection strength in laminating direction (Z direction). Firstly, the key factors in jet puncture process are investigated. Parameter optimization and dynamic modeling of jet process have been studied to explore the mechanism of jet puncture process. Then a fluid simulation is conducted by studying the formation and distribution of diffusion flow field, jet resistance, penetration ability and jet kinetic energy loss. Finally, the fluid software is used to simulate and obtain the optimal structure of carbon cloth and the nozzle. It is expected that this paper can provide a new and effective approach for Z-puncture reinforcement fibers of laminated composite materials.

scholarly journals Fatigue Characteristics and Numerical Modelling Prosthetic for Chopart Amputation

2020 ◽  
Vol 2020 ◽  
pp. 1-10
Author(s):  
Saif M. Abbas ◽  
Ammar I. Kubba
Keyword(s):  
Composite Material ◽  
Carbon Fiber ◽  
Glass Fiber ◽  
Laminated Composite ◽  
Fatigue Properties ◽  
Interface Pressure ◽  
Custom Made ◽  
Fatigue Characteristics ◽  
Design And Manufacture ◽  
Laminated Composite Material

This research is looking for three laminated composite material groups. These three groups were utilized in experimental investigation to find their mechanical properties. These properties have been used to design and manufacture a socket for a partial foot prosthesis using an ANSYS model. This socket was manufactured with a vacuum pressure device to improve its properties. The socket composite material was tested for tensile and fatigue properties; then, its results were used in the ANSYS model. The composite material matrix was laminated in an 80 : 20 ratio, and there were three types of reinforcement lamination material (Perlon, glass fiber, and carbon fiber). The mechanical property results of these tests were found as follows: using only-Perlon reinforcement, the properties are σ y = 33.6   MPa , σ ult = 35.6   MPa , and modulus   of   elasticity = 1.03   GPa ; using (3Perlon +2carbon fiber +3perlon) layers, the properties were σ y = 65.5   MPa , σ ult = 92.5   MPa , and modulus   of   elasticity = 1.99   GPa ; and using (3Perlon + 2 glass fiber + 3perlon) layers, the results were σ y = 40   MPa , σ ult = 46.6   MPa , and modulus   of   elasticity = 1.4   GPa . The ANSYS model used the boundary condition from the measured contact pressure between the socket and the patient’s stump. The MatScan (F-socket) pressure sensor utilized these interface pressure measurements. The maximum values for the pressure were found as follows: 190 kPa and 164 kPa, which are recorded in the posterior and lateral locations, respectively. The calculated factor of safety for the prosthesis that has been made from a selected composite material with the following layers (3 Perlon+2 carbon fiber+3 Perlon) is 1.037 which is safe for design prosthetic applications. From this study, more prosthetic designs can be modelled and manufactured using this approach. Prosthetics and orthotics are usually custom-made for each patient according to its specific requirements. So, it will be very helpful to find a procedure to analyze the prosthetics before manufacturing it.

scholarly journals Deformable Bowtie Antenna Realized by 4D Printing

Electronics ◽  
2021 ◽  
Vol 10 (15) ◽  
pp. 1792
Author(s):  
Lei Wu ◽  
Jiawei Huang ◽  
Minglong Zhai ◽  
Bing Sun ◽  
Hudong Chang ◽  
...  
Keyword(s):  
Composite Material ◽  
Carbon Fiber ◽  
Laminated Composite ◽  
4D Printing ◽  
Maximum Gain ◽  
Bowtie Antenna ◽  
External Power ◽  
Half Power ◽  
Laminated Composite Material ◽  
Bow Tie

4D printing is utilized to fabricate of thermo-deformable bow-tie antenna to fulfill some special applications with limited space or changing antenna property. In this paper, 4D printing is used to manufacture nylon and carbon fiber laminated composite material. The bow-tie antenna is installed on the surface of the composite material, and the carbon fiber is energized and heated, which causes thermal deformation of the substrate to reconfigure the antenna feature. The deformation mechanism of the composite material is explained, the characteristics of the thermally deformed bow-tie antenna with power applied to carbon fiber are analyzed. The results show that the energized carbon fiber heats up, causing the structure to stretch to a flat, with a maximum gain of 2.37 dBi and the −10 dB bandwidth being 4.28–4.64 GHz and 5.16–5.52 GHz, and the half-power beamwidth is greater than 60°. The structure bends at a 30° angle with a maximum gain of 3.58 dBi in the absence of external power, delivering a −10 dB bandwidth range of 4.12–5.6 GHz and a half-power beamwidth close to 45°. The customization of antenna radiation patterns and antenna gain can be readily tuned with power control.

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