scholarly journals Epoxy and Polyester Composites’ Characteristics under Tribological Loading Conditions

Polymers ◽  
2021 ◽  
Vol 13 (14) ◽  
pp. 2230
Author(s):  
Jasem Ghanem Alotaibi ◽  
Ayedh Eid Alajmi ◽  
Gabrel A. Mehoub ◽  
Belal F. Yousif
Keyword(s):  
Friction Coefficient ◽  
Glass Fibre ◽  
Maximum Speed ◽  
Gfrp Composites ◽  
Parallel Orientation ◽  
Wear Rates ◽  
Ring Configuration ◽  
Normal Orientation ◽  
Glass Fibre Reinforced ◽  
Frictional Forces

This research examines the friction and dry wear behaviours of glass fibre-reinforced epoxy (GFRE) and glass fibre-reinforced polyester (GFRP) composites. Three fibre orientations—parallel orientation (P–O), anti-parallel orientation (AP–O), and normal orientation (N–O)—and various sliding distances from 0–15 km were examined. The experiments were carried out using a block-on-ring configuration at room temperature, an applied load of 30 N, and a sliding velocity of 2.8 m/s. During the sliding, interface temperatures and frictional forces were captured and recorded. Worn surfaces were examined using scanning electron microscopy to identify the damage. The highest wear rates for GFRE composites occurred in those with AP–O fibres, while the highest wear rates for GFRP composites occurred in those with P–O fibres. At longer sliding distances, composites with P–O and N–O fibres had the lowest wear rates. The highest friction coefficient was observed for composites with N–O and P–O fibres at higher sliding speeds. The lowest friction coefficient value (0.25) was for composites with AP–O fibres. GFRP composites with P–O fibres had a higher wear rate than those with N–O fibres at the maximum speed.

Effect of the Gel Coat Composition on the Tensile Strength for Glass Fibre Reinforced Polyester Composites

2015 ◽  
Vol 1125 ◽  
pp. 79-83 ◽  
Author(s):  
Ahmad ◽  
M.R. Abdullah ◽  
Ab. Saman Abd Kadir
Keyword(s):  
Tensile Strength ◽  
Comparative Analysis ◽  
Glass Fibre ◽  
Gfrp Composites ◽  
Composite Surface ◽  
A Value ◽  
Before And After ◽  
Glass Fibre Reinforced ◽  
Polyester Composites ◽  
The Difference

In this study, the effect of the gel coat composition on tensile strength of glass fibre reinforced polyester (GFRP) composites was evaluated. The experiments were conducted on various gel coat composition and time. Samples were immersed in sea and river water for 6 months to investigate the differences in tensile strength. Optical observation using SEM on the composites surface and comparative analysis in terms of tensile strength were used before and after immersing. As results, the most excellent tensile strength was the gel coat composition consisting of 0.3 kg of reolosil QS-102 with 10 kg of resin SHCP 268BQTN with a value of 51.9 MPa. Tensile strength reduced about 33.4 % compared to other sample where reduced to 46.3401 %. The difference in the composite surface as a result of immersion process on each sample was also discussed in this paper.

scholarly journals INFLUENCE OF BIODIESEL AND BLENDED FUELS ON THE TENSILE AND COMPRESSIVE PROPERTIES OF GLASS FIBRE REINFORCED EPOXY COMPOSITES

2019 ◽  
Vol 82 (1) ◽  
Author(s):  
S. Kumarasamy ◽  
Nurul Musfirah Mazlan ◽  
M. Shukur Zainol Abidin ◽  
A. Anjang
Keyword(s):  
Mechanical Properties ◽  
Glass Fibre ◽  
Volume Fraction ◽  
Aviation Fuel ◽  
Biodiesel Fuel ◽  
Mechanical Degradation ◽  
Void Content ◽  
Gfrp Composites ◽  
Viscosity Property ◽  
Glass Fibre Reinforced

With the recent usage increase of biodiesel as an alternative fuel source as well as the increase in the utilisation of glass fibre reinforced polymer (GFRP) as structure such as tanks have considerably affected the necessity to study the influence of fuel absorption on the mechanical properties of GFRP composites. Biodiesel is a renewable, efficient and environmentally friendly but possess a high viscosity property. Three main fuel types which consist of aviation fuel, biodiesel and a blend between aviation and biodiesel fuel are used to perform complete immersion of the GFRP specimens. An experimental method is used to investigate the mechanical degradation in term of tension and compression properties of the GFRP composites. The GFRP specimens are aged using immersion bath technique. Vacuum assisted resin transfer moulding (VARTM) is used to manufacture the GFRP specimens with a volume fraction of 0.50 with a void content below 3%. The GFRP specimens were immersed in the fuels until it reaches an equilibrium state before the tensile and compression test was carried out to study the mechanical properties of the immersed specimens. Based on the result obtained, the GFRP specimens that were immersed in all three fuel solution display a slight degradation in term of tensile and compressive strength as well as their Young’s modulus when compared to an as-received (standard) specimen. It is concluded, that the GFRP composite was able to resist the fuels corrosive nature as they can retain most of their mechanical strength and the decrement is not significant.  

scholarly journals Exploration of Nano Fillers (Multi Walled Carbon Nano Tubes and Graphene Powders) in the Reinforcement of Epoxy/Glass Fibre Polymers (GFRP)

2019 ◽  
Vol 8 (12) ◽  
pp. 2718-2722
Keyword(s):  
Mechanical Properties ◽  
Glass Fibre ◽  
Experimental Investigations ◽  
Matrix Interface ◽  
Gfrp Composites ◽  
Reinforced Polymers ◽  
The Matrix ◽  
Glass Fibre Reinforced ◽  
Carbon Nano Tubes ◽  
Fibre Matrix

Variations in the mechanical properties of the glass fibre reinforced polymers were seen when exploring nano fillers such as Multi Walled Carbon Nano Tubes (MWCNTs) and graphene powders for reinforcement. GFRP composites when fabricated with increase in percentage weights of MWCNTs and graphene get better interfacial bonding with the matrix. Nano fillers improve the performance of the composites. This paper deals with the examination and experimental investigations carried out for the prediction of the enhancement of mechanical properties on GFRP reinforced with MWCNTs and graphene powders. GFRP composites were fabricated with variations in the amount of nano fillers in percentage weights of 2%, 4%, 6%, 8% and 10% wt. MWCNTs and graphene powders. The method used for reinforcement of resin with nano fillers was ultrasonication method meant for avoiding voids. A tendency for the mechanical properties to deteriorate was observed when nano fillers added were beyond certain weights of MWCNTs and graphene powders. This could be due to the agglomeration of nano fillers that change the fibre/matrix interface. Graphene nano fillers opts to be better compared to MWCNTs since the fabricated graphene reinforced glass fibre specimens have a better performance than GFRP specimens reinforced with MWCNTs.

scholarly journals Damage Behaviour and Stress Concentration Factor of Open Hole Tensile (OHT) Glass Fibre Reinforced Polymer (GFRP) Composites

2019 ◽  
Vol 16 (4) ◽  
pp. 7299-7314
Author(s):  
J. Bale
Keyword(s):  
Stress Concentration ◽  
Theoretical Analysis ◽  
Glass Fibre ◽  
Stress Concentration Factor ◽  
Gfrp Composites ◽  
Reinforced Polymer ◽  
Glass Fibre Reinforced Polymer ◽  
Open Hole ◽  
Fibre Reinforced Polymer ◽  
Glass Fibre Reinforced

In many applications of composites, open-hole frequently includes for various purposes. However, further study on open-hole behaviour is still required, including on its strength and damage properties by combining experimental testing, real-time observations and calculations based on theoretical analysis and simulation model. The objective of this study is to understand the effect of an open-hole glass fibre reinforced polymer (GFRP) composites on tensile (static) properties, damage behaviour through Non-destructive Testing (NDT) Thermography and stress concentration factor (SCF). This study used an open-hole rectangular of GFRP specimens that fabricated by filament winding (FW) method and resin transfer moulding (RTM) method. It is found that the RTM specimens generate ≈ 170 % higher of tensile strength and ≈ 100 % higher of tensile modulus compared to the FW specimens. Infra-red (IR) camera shown the good detection on damage behaviour based on temperature increase at elastic and failure phase. Moreover, theoretical analysis and simulation results shown the good correlation where SCF reaches more than 4 times at the edge of the hole. This study concludes that open-hole on GFRP composites affects the tensile properties and generates damage marked by temperature increase and high SCF at the edge of the hole.

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