scholarly journals Effect of Combined Stresses on Fiber- Epoxy Composite Curved Pipe

2018 ◽  
Vol 26 (7) ◽  
pp. 58-71
Author(s):  
Fadhel Abbas Abdullah ◽  
Omar Emad Shukry
Keyword(s):  
Internal Pressure ◽  
Volume Fraction ◽  
Epoxy Composite ◽  
Fiber Composite ◽  
Bending Moment ◽  
Longitudinal Direction ◽  
Curve Pipe ◽  
Curved Pipe ◽  
Composite Curve ◽  
Composite Pipes

The aim of this research is to study the behavior of fiber epoxy composite curve pipe under internal pressure and bending moment. The specimens made from woven roving (Mat) fiber glass pipes and epoxy composite with 50% volume fraction are used to manufacturing curved pipe. The experimental work included manufacturing pipe specimens by vacuum bag technique. Pipe specimens were having 100mm inner diameter, 450 mm length of curvature center line of curve pipe with (43 degree) and two wall thickness are 4 and 3 mm. The test rig was designed and performed to study the effect of internal pressure and bending moment on the composite pipes. Also, the tensile test of the samples was done. The analytical expression solution has been accomplished to determine the strain, stress, for hoop and longitudinal direction. It is evident that the hoop stress for woven roving fiber composite pipe was more than longitudinal stress by almost (14%). The maximum internal pressure in the case of internal pressure only was more than compared to the combined internal pressure with bending moment by almost (115%). The most dangerous region is found in the inner arc of the curved pipe (intrude) area.

Determination of the Directional Dependent In-Plane Thermal Conductivity of K63B12 Pitch-Fiber/Epoxy Composite

2004 ◽  
Author(s):  
Jessica N. McClay ◽  
Peter Joyce ◽  
Andrew N. Smith
Keyword(s):  
Thermal Conductivity ◽  
Thermal Management ◽  
Fiber Volume Fraction ◽  
Volume Fraction ◽  
Epoxy Composite ◽  
Fiber Composite ◽  
Fiber Volume ◽  
State Technique ◽  
Fiber Composite Materials

Measurements of the in-plane thermal conductivity and the directional dependence of Mitsubishi K63B12 pitch-fiber/Epoxy composite from Newport Composites are reported. This composite is being explored for use in the Avanced Seal Delivery System for effective thermal management. The thermal conductivity was measured using a steady state technique. The experimental results were then compared to a model of the thermal conductivity based on the direction of the fibers. These estimates are based on the properties of the constituent materials and volume of fibers in the sample. Therefore the density and the fiber volume fraction were experimentally measured. The thermal conductivity is clearly greatest in the direction of the fibers and decreases as the fibers are rotated off axis. In the case of pitch fiber composite materials, the contribution of the fibers to the thermal conductivity dominates. The experimental data clearly followed the correct trends; however, the measured values were 25% to 35% lower than predicted.

An Experimentally and Numerically Comparison between E-Glass/Epoxy and Basalt/Epoxy Pipes Pressurized Internally

2020 ◽  
Vol 305 ◽  
pp. 49-56
Author(s):  
Thamir Aunal Deen Mohammed Sheet Almula ◽  
Ikram H. Amori ◽  
Mohd Yazid Yahya ◽  
Amran Ayob
Keyword(s):  
Internal Pressure ◽  
Natural Fiber ◽  
Fiber Composite ◽  
Basalt Fiber ◽  
High Strength ◽  
Filament Winding ◽  
Cost Ratio ◽  
Composite Pipes ◽  
Winding Angle ◽  
Good Agreement

The current composite pipes such as E-glass have better properties compared to metallic pipes. However, these pipes are prone to failure during its service life. In contrast, natural fiber such as basalt fiber composite pipes has better mechanical characteristics compared to current composite pipes. Hoop tensile, longitudinal tensile and internal pressure loads were carried out through experimentally and numerically investigation on the basalt/epoxy and E-glass/epoxy pipe performance. The basalt/epoxy and E-glass/epoxy composite pipes have been manufactured with ±55o winding angle using dry filament winding with impregnation of epoxy resin used Vacuum Infusion Process (VIP) technique and investigated. Basalt and E-glass composite pipes with winding angles of ±45o, ±55o, ±65o, ±75o were fabricated in order to assess the optimal winding angle which can resists the subjected loads. There were good agreement between numerical and experimental results have been recorded. For internal pressure test, the basalt pipes have more internal pressure carrying capacity more than E-glass by 2.41%. Through this investigation, can be concluded that the natural based fiber of basalt can be used as a suitable replacement than E-glass, has further advantages of being cheap, abundant, renewable and easily recyclable. The also possess high strength, excellent flexural stiffness to cost ratio and low thermal conductivity

scholarly journals Large deflection analysis of nanocomposite cylindrical shell subjected to internal pressure

2020 ◽  
Author(s):  
E. Rahimi ◽  
M.E. Golmakani ◽  
M. Sadeghian
Keyword(s):  
Cylindrical Shell ◽  
Internal Pressure ◽  
Large Deflection ◽  
Volume Fraction ◽  
Geometrical Nonlinearity ◽  
Longitudinal Direction ◽  
Functionally Graded ◽  
Various Boundary Conditions ◽  
Reinforced Composite ◽  
Deflection Analysis

Abstract In this work, large deflection behavior of a functionally graded carbon nanotube reinforced composite (FG-CNTRC) cylindrical shell under internal pressure is studied. The composite cylindrical shell reinforced along the longitudinal direction and made from a polymeric matrix. Based on first-order shear deformation shell theory (FSDT) and von Kármán geometrical nonlinearity, the set of governing equations are derived. Using the dynamic relaxation (DR) technique, these systems of equations are solved for various boundary conditions and the roles of volume fraction of CNTs, CNTs distributions and geometrical ratios are examined on the responses.

Mechanical Behavior of Composite Multilayered Basalt/E-Glass/Epoxy Pipe under Internal Pressure

2015 ◽  
Vol 1125 ◽  
pp. 227-234 ◽  
Author(s):  
Thamir Aunal Deen Mohammed Sheet Almula ◽  
Mohd Yazid Yahya ◽  
Amran Ayob ◽  
Iqbal Makhtar ◽  
Amran Alias
Keyword(s):  
Internal Pressure ◽  
Mechanical Behavior ◽  
Natural Fiber ◽  
Fiber Composite ◽  
Glass Fibers ◽  
Basalt Fiber ◽  
Filament Winding ◽  
Mechanical And Thermal Properties ◽  
Fiber Reinforced ◽  
Composite Pipes

Pressurized composite pipes made of concentric fiber reinforced polymer layers have found much interest among researchers. These composite pipes possess mechanical and thermal properties that exceed those of their constituent materials. This development is motivated by the demand for corrosion resistant, lighter and high specific stiffness components. Natural fiber composite materials retain better flexural stiffness and are environmentally friendly. Unlike experimental testing, numerical investigations on the manufacture and performance of natural fiber reinforced pipes under internal pressure seem lacking. In this analysis, the mechanical behavior of multilayer composite pipes made of natural basalt and E-glass fibers under internal pressure were carried out numerically. The multilayered composite pipes were fabricated by employing filament winding technique with, basalt and E-glass fibers, with fiber orientation angles of ±45o, ±55o, ±65o, ±75o. The matrix epoxy resin was infused using vacuum infusion process (VIP). A longitudinal and hoop tensile test rig, designed and fabricated according to ASTM D2105 and D2299 respectively, was used to determine the hoop and longitudinal properties of the pipes. Numerical simulations were conducted to determine the stress and strain behaviors with the intention to find the effect of ply angle, basalt and glass properties and also to evaluate the performance of the new natural basalt fiber as an alternative to E-glass/Epoxy.

Control Force Enhancement of Conical Shells Using Piezoelectric Macro-Fiber Composite

2013 ◽  
Author(s):  
H. Li ◽  
H. Y. Li ◽  
H. S. Tzou
Keyword(s):  
Conical Shell ◽  
Piezoelectric Materials ◽  
Fiber Composite ◽  
Bending Moment ◽  
Longitudinal Direction ◽  
Control Force ◽  
Force Enhancement ◽  
Actuation Force ◽  
Macro Fiber Composite ◽  
Converse Piezoelectric Effect

In piezoelectric coupled shells, the distributed actuation force usually consists of four components, including the membrane force and bending moment in the longitudinal direction, and the membrane force and bending moment in the circumferential direction. For commonly used bi-axial piezoelectric materials, such as PZT and PVDF, these four components may have phase difference of π or −π. This leads to force cancellation and reduces the overall control effectiveness. Supposing that one piezoelectric actuator is uni-axial, for example only d31 is not equal to zero, and then this actuator will generate actuation force with the first two components or the latter two, depending on the actuator configuration and the shell geometry/modes. Accordingly the force cancellation can be avoided or minimized. In this research, the Macro-Fiber Composite (MFC) actuators are used as uni-axial actuators. The dynamic equation of a conical shell is firstly given. Then the actuation force is derived based on the converse piezoelectric effect and thin shell assumptions. Three types of the MFC actuators are considered, including MFC-P1, MFC-P2 and MFC-P3. Case studies are performed to evaluate the distributed actuation forces. Both axial and transverse vibrations of the conical shell are formulated to study the force cancellation of various shell modes, and the payload effects are considered in the analysis. The results show that, by using the MFC actuators, actuation force can be enhanced because force cancellation is avoided. The force enhancement becomes even more significant for membrane dominated modes, such as axial modes of shells with heavy payloads.

Hydrothermal effects on the burst strength of impacted glass fiber/epoxy composite pipes

2016 ◽  
Vol 58 (4) ◽  
pp. 333-336 ◽  
Author(s):  
Hawa Ahmad ◽  
Mohd. Shukry Abdul Majid ◽  
Mohd. Afendi Rojan ◽  
Fauziah Mat ◽  
Yakubu Dan-Mallam
Keyword(s):  
Glass Fiber ◽  
Epoxy Composite ◽  
Burst Strength ◽  
Composite Pipes

Residual strength of fire-exposed glass-reinforced epoxy composite pipes

2019 ◽  
Vol 61 (7) ◽  
pp. 618-620
Author(s):  
Naveen Raj Visvanathan ◽  
Mohd Shukry Abdul Majid ◽  
Faisal Abrar Syamsul Bahri ◽  
Mohd Ridzuan Mohd Jamir ◽  
Mohd Afendi Rojan Arau
Keyword(s):  
Residual Strength ◽  
Epoxy Composite ◽  
Composite Pipes

scholarly journals Effects of SiC Fibers and Laminated Structure on Mechanical Properties of Ti–Al Laminated Composites

Materials ◽  
2021 ◽  
Vol 14 (6) ◽  
pp. 1323
Author(s):  
Chenyang Hou ◽  
Shouyin Zhang ◽  
Zhijian Ma ◽  
Baiping Lu ◽  
Zhenjun Wang
Keyword(s):  
Volume Fraction ◽  
Raw Materials ◽  
Laminated Composites ◽  
Intermetallic Layer ◽  
Longitudinal Direction ◽  
Fracture Mechanisms ◽  
Compact Structure ◽  
Laminated Structure ◽  
Sic Fibers ◽  
Sic Fiber

Ti/Ti–Al and SiCf-reinforced Ti/Ti–Al laminated composites were fabricated through vacuum hot-pressure using pure Ti foils, pure Al foils and SiC fibers as raw materials. The effects of SiC fiber and a laminated structure on the properties of Ti–Al laminated composites were studied. A novel method of fiber weaving was implemented to arrange the SiC fibers, which can guarantee the equal spacing of the fibers without introducing other elements. Results showed that with a higher exerted pressure, a more compact structure with fewer Kirkendall holes can be obtained in SiCf-reinforced Ti/Ti–Al laminated composites. The tensile strength along the longitudinal direction of fibers was about 400 ± 10 MPa, which was 60% higher compared with the fabricated Ti/Ti–Al laminated composites with the same volume fraction (60%) of the Ti layer. An in situ tensile test was adopted to observe the deformation behavior and fracture mechanisms of the SiCf-reinforced Ti/Ti–Al laminated composites. Results showed that microcracks first occurred in the Ti–Al intermetallic layer.

scholarly journals Effect of Terminal Groups on Thermomechanical and Dielectric Properties of Silica–Epoxy Composite Modified by Hyperbranched Polyester

Polymers ◽  
2021 ◽  
Vol 13 (15) ◽  
pp. 2451
Author(s):  
Jianwen Zhang ◽  
Dongwei Wang ◽  
Lujia Wang ◽  
Wanwan Zuo ◽  
Lijun Zhou ◽  
...  
Keyword(s):  
Dielectric Constant ◽  
Dielectric Properties ◽  
Binding Energy ◽  
Epoxy Resin ◽  
Volume Fraction ◽  
Epoxy Composite ◽  
Mean Square Displacement ◽  
Mean Square ◽  
Hyperbranched Polyester ◽  
Free Volume Fraction

To study the effect of hyperbranched polyester with different kinds of terminal groups on the thermomechanical and dielectric properties of silica–epoxy resin composite, a molecular dynamics simulation method was utilized. Pure epoxy resin and four groups of silica–epoxy resin composites were established, where the silica surface was hydrogenated, grafted with silane coupling agents, and grafted with hyperbranched polyester with terminal carboxyl and terminal hydroxyl, respectively. Then the thermal conductivity, glass transition temperature, elastic modulus, dielectric constant, free volume fraction, mean square displacement, hydrogen bonds, and binding energy of the five models were calculated. The results showed that the hyperbranched polyester significantly improved the thermomechanical and dielectric properties of the silica–epoxy composites compared with other surface treatments, and the terminal groups had an obvious effect on the enhancement effect. Among them, epoxy composite modified by the hyperbranched polyester with terminal carboxy exhibited the best thermomechanical properties and lowest dielectric constant. Our analysis of the microstructure found that the two systems grafted with hyperbranched polyester had a smaller free volume fraction (FFV) and mean square displacement (MSD), and the larger number of hydrogen bonds and greater binding energy, indicating that weaker strength of molecular segments motion and stronger interfacial bonding between silica and epoxy resin matrix were the reasons for the enhancement of the thermomechanical and dielectric properties.

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