Prediction of the elastic modulus of SWCNT/epoxy composite based on the micromechanics

2015 ◽  
Vol 57 (7-8) ◽  
pp. 690-696 ◽  
Author(s):  
Hassan S. Hedia ◽  
Saad M. Aldousari ◽  
Ahmed K. Abdellatif ◽  
Gamal S. Abdelhafeez
Keyword(s):  
Elastic Modulus ◽  
Epoxy Composite

Thermal Modulus Evaluation of Arenga pinnata Fibre Reinforced Epoxy Composite: Effect of Moisture Absorption

2014 ◽  
Vol 911 ◽  
pp. 18-22
Author(s):  
Abdul Hakim Abdullah ◽  
Mohd Ridzuan Mohd Razali ◽  
Muhd Azimin A. Ghani
Keyword(s):  
Thermal Analysis ◽  
Elastic Modulus ◽  
Moisture Absorption ◽  
Epoxy Composite ◽  
Flexural Modulus ◽  
Experimental Result ◽  
Fibre Reinforcement ◽  
Composite Effect ◽  
Effect Of Moisture ◽  
Modulus Curve

This paper presents the effect of moisture absorption towards thermal modulus evaluation of Arenga Pinnata fibre reinforced epoxy composite. The specimens are produced by hand lay-up method for practically with the ratio of combination of fibre with epoxy and hardener. The fibres were treated with sodium hydroxide (NaOH) prior the composites fabrication. Then, it were submerged in the water for moisture absorption and left for 8 days, 16 days and 30 days. The flexural modulus indicates there is reduction of elastic modulus values over the submerged period. Thermal analysis depicted by storage modulus curve showed the submerged specimens were not affected too much as compared to the control specimens. In fact, their performances were remaining the same across the temperature across from-10°C to 100°C. It is suggested from the experimental result that Arenga Pinnata fibres have a potential prospect as fibre reinforcement composites in many application.

scholarly journals Investigation on the Durability of E-Glass/Epoxy Composite Exposed to Seawater at Elevated Temperature

Polymers ◽  
2021 ◽  
Vol 13 (13) ◽  
pp. 2182
Author(s):  
Amir Hussain Idrisi ◽  
Abdel-Hamid I. Mourad ◽  
Beckry M. Abdel-Magid ◽  
B. Shivamurty
Keyword(s):  
Elastic Modulus ◽  
Elevated Temperature ◽  
Epoxy Composite ◽  
Degradation Mechanism ◽  
Shift Factor ◽  
Time Shift ◽  
Slight Variation ◽  
Seawater Environment ◽  
Prediction Approach ◽  
Strength Retention

In this manuscript, the durability of the E-glass/epoxy composite was determined under a seawater environment. The effect of harsh environment was investigated in terms of seawater absorption, microstructure and degradation in mechanical properties. E-glass epoxy composite specimens were conditioned in gulf seawater at 23 °C, 65 °C and 90 °C for the period of 12 months. It was observed that the mass of the samples increased after the immersion of 12 months at 23 °C and 65 °C whereas it reduced at 90 °C. The salt deposition was observed at the surface of specimens without any crack for the seawater conditioning at 23 °C and 65 °C. The swelling and crack formation were significantly visible on the surface of the specimen immersed for 12 months at 90 °C. It indicates that the degradation mechanism accelerated at elevated temperature results fiber/matrix debonding. The tensile test indicates slight variation in the elastic modulus and reduction in strength of E-glass epoxy composite by 1% and 9% for specimens immersed at 23 °C and 65 °C respectively. However, at 90 °C, the tensile strength sharply decreased to 7% and elastic modulus significantly increased in the exposure of 12 months. A prediction approach based on a time-shift factor (TSF) was used. This model predicted that the strength retention of E-glass/Epoxy composite will be reduced to 7% in 450 years after immersion in seawater at 23 °C. Lastly, the activation energy for the degradation of the composite was calculated.

scholarly journals PULL AND BENDING FORCE USING FIBERGLASS WR EPOXY COMPOSITE MATERIALS AND FIBER CARBON EPOXY

Vortex ◽  
2021 ◽  
Vol 2 (1) ◽  
pp. 1
Author(s):  
Alphario Rachmatino Yudiana
Keyword(s):  
Elastic Modulus ◽  
Composite Materials ◽  
Carbon Fiber ◽  
Epoxy Composite ◽  
Testing Machine ◽  
Maximum Load ◽  
Average Value ◽  
Bending Force ◽  
Universal Testing ◽  
College Of Technology

Bending testing is carried out in the lab. Nurtanio Adisutjipto College of Technology Yogyakarta uses the Gotech Testing Machine INC (Universal Testing Machine) UTM testing machine where the results obtained in the test are in the form of a graphic in which the maximum load value, elastic modulus, area, yield point and span have been obtained. From the results of these tests, we can compare the average value of the maximum load and the modulus of elasticity received in each specimen with variations in carbon fiber and WR fiberglass.

MECHANICAL PROPERTIES OF SURFACTANT-COATING CARBON NANOFIBER/EPOXY COMPOSITE

2002 ◽  
Vol 01 (05n06) ◽  
pp. 425-430 ◽  
Author(s):  
ZHE YING ◽  
JIN-HONG DU ◽  
SHUO BAI ◽  
FENG LI ◽  
CHANG LIU ◽  
...  
Keyword(s):  
Tensile Strength ◽  
Elastic Modulus ◽  
Carbon Nanofiber ◽  
Epoxy Composite ◽  
Surfactant Solution ◽  
Ultimate Strain ◽  
Epoxy Composites ◽  
Alkyl Ether ◽  
Magnetic Stirring ◽  
Surfactant Aqueous Solution

Carbon nanofibers (CNFs) were coated by surfactants of polyoxyetheylene alkyl ether ( AEO 9, AEO 7) and polyvinyl alcohol (PVA 1799), respectively, after being mixed with surfactant aqueous solution and then treated with ultrasonication, high shear and magnetic stirring. The CNF/epoxy composites were prepared by mixing the surfactant coated CNFs with epoxy. Tensile strength, elastic modulus and ultimate strain of the composites were studied. The tensile strength and the ultimate strain of the composites were increased by 20% and 70%, respectively, after the CNFs were coated by surfactants. However, the elastic modulus of the composite will be lowered when the CNFs were treated by too high a concentration of surfactant solution.

Changes in mechanical properties of GFRP composite after exposure to warm seawater

2016 ◽  
Vol 51 (19) ◽  
pp. 2733-2742
Author(s):  
Hamid Ronagh ◽  
Nariman Saeed
Keyword(s):  
Mechanical Properties ◽  
Elastic Modulus ◽  
Tensile Strain ◽  
Epoxy Composite ◽  
Tensile Tests ◽  
Mechanical Parameters ◽  
Saturation Condition ◽  
Laboratory Environment ◽  
The Third ◽  
Gfrp Composite

This article presents the results of tensile tests performed on E-glass/Epoxy composite coupons. Eighteen GFRP panels were manufactured and cured in laboratory environment, out of which specimens in size of 25 mm × 250 mm specimens were cut. The specimens were categorised into three groups; the first group was post-cured at 60℃ oven for 16 h while the second and the third groups were placed under seawater at 60℃ for about 60 days and 4 months to represent saturation condition and ageing, respectively. The mechanical parameters such as elastic modulus (E), ultimate tensile strain (ɛu) and shear modulus (G) which are reported here were measured and were compared to one another showing that these are influenced by different conditioning regimes to a great extent.

Effect Of Elevated Temperatures On Complete Concrete Deformation Diagrams

2019 ◽  
pp. 9-14
Keyword(s):  
Experimental Data ◽  
Elastic Modulus ◽  
Elevated Temperatures ◽  
Peak Load ◽  
Relative Deformation ◽  
Deformation Characteristics ◽  
Compression Tests ◽  
Strain Behavior ◽  
Different Temperatures ◽  
Deformation Diagrams

The analysis of the previous results of the study on concrete stress-strain behavior at elevated temperatures has been carried out. Based on the analysis, the main reasons for strength retrogression and elastic modulus reduction of concrete have been identified. Despite a significant amount of research in this area, there is a large spread in experimental data received, both as a result of compression and tension. In addition, the deformation characteristics of concrete are insufficiently studied: the coefficient of transverse deformation, the limiting relative compression deformation corresponding to the peak load and the almost complete absence of studies of complete deformation diagrams at elevated temperatures. The two testing chambers provided creating the necessary temperature conditions for conducting studies under bending compression and tension have been developed. On the basis of the obtained experimental data of physical and mechanical characteristics of concrete at different temperatures under conditions of axial compression and tensile bending, conclusions about the nature of changes in strength and deformation characteristics have been drawn. Compression tests conducted following the method of concrete deformation complete curves provided obtaining diagrams not only at normal temperature, but also at elevated temperature. Based on the experimental results, dependences of changes in prism strength and elastic modulus as well as an equation for determining the relative deformation and stresses at elevated temperatures at all stages of concrete deterioration have been suggested.

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