Flexural Properties of Epoxy Composites Filled with Glass Powder: Preliminary Results

2011 ◽  
Vol 410 ◽  
pp. 309-312 ◽  
Author(s):  
Harry Ku ◽  
Peter Wong ◽  
J. Huang ◽  
H. Fung ◽  
Mohan Trada
Keyword(s):  
Flexural Strength ◽  
Epoxy Resin ◽  
Glass Powder ◽  
Epoxy Composites ◽  
Research Centre ◽  
Flexural Properties ◽  
Preliminary Results ◽  
Structural Applications ◽  
Flexural Tests ◽  
Sufficient Strength

Epoxy resin was filled with glass powder with a view to increasing strength of the composite for structural applications by a research Centre on composites, University of Southern Queensland (USQ). In order to reduce costs, the Centre wishes to fill as much glass powder as possible subject to maintaining sufficient strength of the composites in structural applications. This project varies the percentage by weight of the glass powder in the composites which are then subjected to flexural tests. The results show that composite with 25 % by weight of the glass powder produces the highest flexural strength and Young’s modulus combined with a reasonable fluidity for casting; the highest flexural strain was achieved when the percentage by weight of glass powder is 10 %.

scholarly journals A Pilot Study on the Flexural Properties of Vinyl Ester Composites Filled with Glass Powder

2010 ◽  
Vol 123-125 ◽  
pp. 3-6
Author(s):  
Harry Ku ◽  
Mohan Trada ◽  
Rezwanul Huq
Keyword(s):  
Flexural Strength ◽  
Vinyl Ester ◽  
Glass Powder ◽  
Filler Content ◽  
Flexural Modulus ◽  
Research Centre ◽  
Flexural Properties ◽  
Structural Applications ◽  
Flexural Tests ◽  
Sufficient Strength

Vinyl ester resin was filled with of glass powder with a view to increasing the flexural strength of the composites for civil and structural applications by a research Centre on composites, University of Southern Queensland (USQ). In order to reduce costs, the Centre wishes to fill as much glass powder as possible to the resin subject to maintaining sufficient strength of the composites in civil and structural applications. This project varies the percentage by weight of the glass powder in the composites, which are then subjected to flexural tests. The flexural strength and strain of the glass powder filled vinyl ester composites decreased with increasing filler content but the flexural modulus was highest at 20 w/t % of glass powder. Scanning Electron Microscope (SEM) was used to analyze the fractured samples and it was found that the fractured surfaces examined were correlated with the flexural properties.

scholarly journals Tensile Tests of Glass Powder Reinforced Epoxy Composites: Pilot Study

2011 ◽  
Vol 214 ◽  
pp. 1-5 ◽  
Author(s):  
Harry Ku ◽  
Peter Wong ◽  
J. Huang ◽  
H. Fung ◽  
Mohan Trada
Keyword(s):  
Fracture Toughness ◽  
Epoxy Resin ◽  
Tensile Properties ◽  
Glass Powder ◽  
Young Modulus ◽  
Tensile Tests ◽  
Epoxy Composites ◽  
Research Centre ◽  
Ambient Conditions ◽  
Structural Applications

Epoxy resin was filled with glass powder to optimize the strength and of the composite for structural applications by a research centre in the University of Southern Queensland (USQ). In order to reduce costs, the centre wishes to fill as much glass microspheres as possible subject to maintaining sufficient strength and fracture toughness of the composites in structural applications. This project varies the percentage by weight of the glass powder in the composites. After casting the composites to the moulds, they were cured at ambient conditions for 24 hours. They were then post-cured in a conventional oven and subjected to tensile tests. It was found that the best percentage of glass powder by weight that can be added to the epoxy resin to give an optimum yield and tensile strengths as well as Young modulus and cost was five percent. It was also found that the fractured surfaces examined under scanning electron microscope were correlated with the fracture toughness. The contribution of the study was that if tensile properties were the most important factors to be considered in the applications of the composites, glass powder is not a suitable filler. It is also hoped that the discussion and results in this work would not only contribute towards the development of glass powder reinforced epoxy composites with better material properties, but also useful for the investigations of tensile properties in other composites.

scholarly journals Enhanced flexural properties of aramid fiber/epoxy composites by graphene oxide

2019 ◽  
Vol 8 (1) ◽  
pp. 484-492 ◽  
Author(s):  
Yinqiu Wu ◽  
Bolin Tang ◽  
Kun Liu ◽  
Xiaoling Zeng ◽  
Jingjing Lu ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Flexural Strength ◽  
Interfacial Shear Strength ◽  
Flexural Modulus ◽  
Weight Fraction ◽  
Interfacial Shear ◽  
Aramid Fiber ◽  
Epoxy Composites ◽  
Flexural Properties ◽  
Pure Epoxy

Abstract The reinforcing effect of graphene oxide (GO) in enhancing the flexural strength and flexural modulus of aramid fiber (AF)/epoxy composites were investigated with GO-AFs at a weight fraction of 0.1-0.7%. The flexural strength and flexural modulus of the composite reached 87.16 MPa and 1054.7 MPa, respectively, which were about 21.19% and 40.86% higher than those of the pure epoxy resin, respectively. In addition, the flexural properties and interfacial shear strength (IFSS) of composite reinforced by GO-AFs were much higher than the composites reinforced by AFs due to GO improved the interfacial bonding between the reinforcement material and matrix.

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.

Effect of hybrid thermal cycling and shock on flexural properties of nanoclay/glass/epoxy nanocomposites

2021 ◽  
pp. 096739112110132
Author(s):  
A Bayat ◽  
M Damircheli ◽  
M Esmkhani
Keyword(s):  
Flexural Strength ◽  
Thermal Cycling ◽  
Epoxy Composites ◽  
Flexural Properties ◽  
Flexural Stiffness ◽  
Thermal Cycles ◽  
Epoxy Nanocomposites ◽  
Static Conditions

In present research, the flexural properties of glass/epoxy composites reinforced by nanoclay particles (3, 5 and 7 wt.%) under various hybrid thermal cycling and shock loadings (15 and 30 thermal cycles at immediate −70°C and +100°C temperatures) have been investigated. It was found that the flexural strength of 5 wt.% nanoclay/glass/epoxy nanocomposites under 15 and 30 hybrid thermal loadings was enhanced by 19.35% and 20.78%, respectively. Also, after 15 hybrid thermal loadings, the flexural stiffness of 5 wt.% clay/glass/epoxy nanocomposites increased by 9.30% compared to static conditions. More importantly, after 30 hybrid thermal loadings, by adding more filler contents, the flexural stiffness was increased. For instance, at 7 wt.% clay/glass/epoxy nanocomposites, the flexural stiffness enhanced 17.97% compared to neat composite. FESEM morphology images confirmed that presence of optimum filler contents changed the composites inherent properties. Therefore, the outcome of this research can show various remarkable advantages for researchers to apply nanoclay as nanofillers to reinforce composites structures under hybrid thermal cycling and shock applications.

scholarly journals Hydroxyl-Terminated Triazine Derivatives Grafted Graphene Oxide for Epoxy Composites: Enhancement of Interfacial and Mechanical Properties

Polymers ◽  
2019 ◽  
Vol 11 (11) ◽  
pp. 1866 ◽  
Author(s):  
Lichun Ma ◽  
Yingying Zhu ◽  
Guangshun Wu ◽  
Xiaoru Li ◽  
Chongao Tian ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Graphene Oxide ◽  
Flexural Strength ◽  
Epoxy Matrix ◽  
Interfacial Interaction ◽  
Epoxy Composites ◽  
Functionalized Graphene Oxide ◽  
Pure Epoxy ◽  
Triazine Derivatives ◽  
Flexural Tests

An effective approach to the fabrication of progressive epoxy nanocomposites by the incorporation of hydroxyl-terminated dendrimers functionalized graphene oxide (GO-TCT-Tris) is reported. The relationship between surface grafting, chemical construction, morphology, dispersion, and interfacial interaction as well as the corresponding mechanical properties of the composites were studied in detail. It was shown that hydroxyl-terminated triazine derivatives have been resoundingly bonded onto the GO surface through covalent bonding, which effectively improved the dispersion and compatibility of GO sheets in epoxy resin. The tensile and flexural tests manifested that the GO-TCT-Tris/epoxy composites exhibited greater tensile/flexural strength and modulus than either the pure epoxy or the GO/epoxy composites. For GO-TCT-Tris (0.10 wt%)/epoxy composite, the tensile strength and elastic modulus increased from 63 ± 4 to 89 ± 6 MPa (41.27%) and from 2.8 ± 0.1 to 3.6 ± 0.2 GPa (28.57%), and the flexural strength and modulus increased from 106 ± 5 to 158 ± 6 MPa (49.06%) and from 3.0 ± 0.1 to 3.5 ± 0.2 GPa (16.67%), respectively, compared to the pure epoxy matrix. Moreover, the fractographic analysis also illustrated the ameliorative interfacial interaction between GO-TCT-Tris and epoxy matrix.

scholarly journals MECHANICAL BEHAVIORS OF BANANA AND SISAL HYBRID COMPOSITES REINFORCED WITH EPOXY RESIN

2016 ◽  
Vol 4 (1) ◽  
pp. 206-216
Author(s):  
Hemant Patel ◽  
Ashish Parkhe ◽  
P.K. Shrama
Keyword(s):  
Epoxy Resin ◽  
Renewable Resources ◽  
Hybrid Composites ◽  
Natural Fibers ◽  
Inorganic Materials ◽  
Epoxy Composites ◽  
Flexural Properties ◽  
Mechanical Behaviors ◽  
Paper Test ◽  
Compressive Tests

Natural fibers have been used to reinforce materials for over 200 years. The aim of this study is to evaluate mechanical properties such as tensile and flexural properties of hybrid banana and sisal reinforced epoxy composites they have been employed in combination with plastics. Natural fibers like as hemp, jute, sisal and banana. It’s have the advantage that they are renewable resources and have marketing appeal these agricultural wastes can be used to prepare fiber The composites have many advantages over traditional glass fiber and inorganic materials. In this paper, test are conducted for composite material constitutes banana and less discovered sisal  These composites are adhered using epoxy resin consists resin and hardener suitably mixed in appropriate volume Here for preparing samples Hand layup method is used , specimens are prepared and tests are carried out , which shows tensile and bending strengths. The tensile & compressive tests were applied on specimens of 300×50×10 mm in dimensions but in different proportions of banana and sisal by weight.

Effect of Sizing Removal Method and POSS Coating on Flexural Properties of Carbon Fiber Epoxy Composites

2013 ◽  
Author(s):  
Fariz Ibn Afzal ◽  
Mrinal C. Saha ◽  
M. Cengiz Altan
Keyword(s):  
Carbon Fiber ◽  
Flexural Strength ◽  
Epoxy Composites ◽  
Flexural Properties ◽  
Carbon Fiber Composites ◽  
Heat Treated ◽  
Electron Microscopy Analysis ◽  
Microscopy Analysis ◽  
Oligomeric Silsesquioxane ◽  
Carbon Fiber Epoxy

Effects of sizing and surface modification on flexural properties of carbon fiber reinforced epoxy composites have been investigated. Carbon fiber was desized using three types of treatments, namely heat, acetone, and acetone-acid. In addition, these fibers were coated with three different types of Polyhedral Oligomeric Silsesquioxane (POSS) molecule. Composite panels were fabricated using the vacuum assisted resin transfer molding and samples were tested in flexure. Scanning electron microscopy analysis was performed to investigate the surface morphology and failure mechanisms. It was found that removal of sizing significantly reduced the flexural strength. About 19% and 29% reduction of flexural strength was reported for acetone treatment and heat treatment, respectively. Composites with POSS coated fibers showed improved properties, except for the heat treated fibers. Among POSS molecules investigated, the S10455 was found to be the best for improving the flexural properties of carbon fiber composites.

scholarly journals Flexural Strength of Phenol Formaldehyde Composites Post-Cured in Microwaves: Preliminary Results

2009 ◽  
Vol 79-82 ◽  
pp. 1399-1402
Author(s):  
Mohan Trada ◽  
Harry Ku ◽  
Jayant Vedhar
Keyword(s):  
Flexural Strength ◽  
Phenol Formaldehyde ◽  
Thermosetting Resin ◽  
Preliminary Results ◽  
And Performance ◽  
Flexural Tests ◽  
Time Required ◽  
Addition Level ◽  
Conventional Oven

A commercial phenol formaldehyde based resole thermosetting resin supplied by Borden Chemical Australia Pty. was filled with ceramic-based fillers (Envirospheres or SLG) to increase its flexural strength. By performing flexural tests at a range of filler addition levels, the optimal addition level of SLG was able to be determined in terms of workability, cost and performance. The composites obtained were post-cured in conventional oven and in microwaves respectively. It was found that the maximum flexural strength of the microwave cured composites were only 5% lower than those cured in conventional oven when the percentage by weight of SLG was 24%. However, the time required for post-curing was also reduced from 10 hours (in conventional oven) to 40 minutes (in microwaves).

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