Experimental Investigation of Mechanical Properties of Glass Fibre/Epoxy Composites with variable volume fraction

2017 ◽  
Vol 4 (9) ◽  
pp. 9487-9490 ◽  
Author(s):  
A. Salgar Swapnil ◽  
B. SatheSandip ◽  
P. ChaudhariBapu ◽  
S. Jagadale Vishal
Keyword(s):  
Mechanical Properties ◽  
Experimental Investigation ◽  
Glass Fibre ◽  
Volume Fraction ◽  
Epoxy Composites ◽  
Variable Volume

Monitoring of mechanical properties of prestressed glass fiber epoxy composites over 12 months after fabrication

2021 ◽  
pp. 002199832110047
Author(s):  
Mahmoud Mohamed ◽  
Siddhartha Brahma ◽  
Haibin Ning ◽  
Selvum Pillay
Keyword(s):  
Mechanical Properties ◽  
Residual Stress ◽  
Flexural Strength ◽  
Compressive Residual Stress ◽  
Fiber Volume Fraction ◽  
Volume Fraction ◽  
Epoxy Composites ◽  
Flexural Properties ◽  
Initial Increase ◽  
Fiber Volume

Fiber prestressing during matrix curing can significantly improve the mechanical properties of fiber-reinforced polymer composites. One primary reason behind this improvement is the generated compressive residual stress within the cured matrix, which impedes cracks initiation and propagation. However, the prestressing force might diminish progressively with time due to the creep of the compressed matrix and the relaxation of the tensioned fiber. As a result, the initial compressive residual stress and the acquired improvement in mechanical properties are prone to decline over time. Therefore, it is necessary to evaluate the mechanical properties of the prestressed composites as time proceeds. This study monitors the change in the tensile and flexural properties of unidirectional prestressed glass fiber reinforced epoxy composites over a period of 12 months after manufacturing. The composites were prepared using three different fiber volume fractions 25%, 30%, and 40%. The results of mechanical testing showed that the prestressed composites acquired an initial increase up to 29% in the tensile properties and up to 32% in the flexural properties compared to the non-prestressed counterparts. Throughout the 12 months of study, the initial increase in both tensile and flexural strength showed a progressive reduction. The loss ratio of the initial increase was observed to be inversely proportional to the fiber volume fraction. For the prestressed composites fabricated with 25%, 30%, and 40% fiber volume fraction, the initial increase in tensile and flexural strength dropped by 29%, 25%, and 17%, respectively and by 34%, 26%, and 21%, respectively at the end of the study. Approximately 50% of the total loss took place over the first month after the manufacture, while after the sixth month, the reduction in mechanical properties became insignificant. Tensile modulus started to show a very slight reduction after the fourth/sixth month, while the flexural modulus reduction was observed from the beginning. Although the prestressed composites displayed time-dependent losses, their long-term mechanical properties still outperformed the non-prestressed counterparts.

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.  

An experimental study on the interdependence of mercerization, moisture absorption and mechanical properties of sustainable Phoenix sp. fibre-reinforced epoxy composites

2018 ◽  
Vol 49 (9) ◽  
pp. 1233-1251 ◽  
Author(s):  
G Rajeshkumar
Keyword(s):  
Mechanical Properties ◽  
Moisture Absorption ◽  
Volume Fraction ◽  
Fibre Volume Fraction ◽  
Fibre Length ◽  
Fibre Volume ◽  
Epoxy Composites ◽  
Compression Moulding ◽  
Fibre Matrix ◽  
Fibre Reinforced Composites

This paper represents the first effort aimed to study the interdependence of mercerization, moisture absorption and mechanical properties of sustainable Phoenix sp. fibre-reinforced epoxy composites fabricated by compression moulding technique. The investigation was carried out by varying the fibre length (10, 20 and 30 mm), fibre volume fraction (10%, 20%, 30%, 40% and 50%), concentration of sodium hydroxide for fibre treatment (5%, 10% and 15%) and immersion temperature (10℃, 30℃ and 60℃). The fibre–matrix interface and failure mechanism was studied by using scanning electron microscopy. The results revealed that the moisture absorption rate increased with the increase in fibre length, fibre volume fraction and immersion temperature result in loss of tensile and flexural properties. The moisture absorbed samples shows 15% and 7% drop in tensile and flexural strength, respectively. However, this loss was less in mercerized fibre-reinforced composites.

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