scholarly journals Effects of Different Relative Humidities on Flax Fibers prior to Manufacturing Their Composites Based on the Shear Response

2020 ◽  
Vol 2020 ◽  
pp. 1-7
Author(s):  
Abdul Moudood ◽  
Anisur Rahman ◽  
Andreas Öchsner ◽  
Md Mainul Islam ◽  
Mohammad Yeakub Ali ◽  
...  
Keyword(s):  
Shear Strength ◽  
Composite Materials ◽  
Absorption Rate ◽  
Moisture Absorption ◽  
Epoxy Composite ◽  
Epoxy Composites ◽  
Engineering Structures ◽  
Sem Images ◽  
Flax Fibers ◽  
Composite Samples

The moisture absorption behavior of flax fiber-reinforced epoxy composites is deliberated to be a serious issue. This property restricts their usage as outdoor engineering structures. Therefore, this study provides an investigation of moisture in flax fibers on the performance of the flax/epoxy composite materials based on their shear responses. The ±45° aligned flax fibers exposed to different relative humidities (RH) and the vacuum infusion process was used to manufacture the composite specimens. The optimum shear strength (40.25 ± 0.75 MPa) was found for the composites manufactured with 35% RH-conditioned flax fibers, but the shear modulus was reduced consistently with increasing RH values. Although shear strength was increased because of fiber swelling with increased moisture absorption rate until 35% RH environments with good microstructures, nonetheless, strength and modulus both started to decrease after this range. A very poor microstructure has been affirmed by the SEM images of the composite samples conditioned at 90% RH environments.

Experimental studies on interlaminar shear strength and dynamic mechanical analysis of luffa fiber epoxy composites with nano PbO addition

2021 ◽  
pp. 152808372110523
Author(s):  
Kumaresan Gladys Ashok ◽  
Kalaichelvan Kani
Keyword(s):  
Shear Strength ◽  
Dynamic Mechanical Analysis ◽  
Epoxy Matrix ◽  
Weight Percent ◽  
Mechanical Analysis ◽  
Interlaminar Shear Strength ◽  
Epoxy Composites ◽  
Dynamic Mechanical ◽  
Interlaminar Shear ◽  
Composite Samples

In the present study, the significance of nanofiller lead oxide (PbO) on the dynamic mechanical analysis (DMA) and interlaminar shear strength (ILSS) performance of luffa fiber–reinforced epoxy composites was investigated. The epoxy matrix was altered with nanofiller PbO of different weight percent through a mechanical stirring process. The PbO-added luffa fiber epoxy composites were made through hand layup preceded by the compression molding method. The prepared composite samples were investigated for ILSS and DMA. The test results lead to the inference that the 1.25 wt% PbO nanofiller–added composite samples attained 25%, 17%, and 55% of higher loss modulus, storage modulus, and ILSS, respectively, as compared with the other prepared samples. The morphological investigation was conducted on the fractured surface of the interlaminar tested samples. The micrographic images show the bonding nature of the luffa fiber with the epoxy matrix, fiber breakage, and fiber pullouts. The characterization studies such as FTIR, XRD, and EDX were conducted on the fabricated composite samples. The XRD studies show that the rise in weight percent of the nanofiller PbO enhances the crystallinity of the composite samples. Moreover, the composite sample prepared with 1.25 wt% nanofiller PbO can be used to prepare low-cost roofing materials for sustainable housing projects.

scholarly journals Komposit Epoksi Diperkuat Serat Corypha Utan: Karakterisasi Morpologi, Kekuatan Tarik Dan kekuatan Lentur

2019 ◽  
Vol 12 (1) ◽  
pp. 27
Author(s):  
Nasmi Herlina Sari ◽  
Agus Dwi Catur ◽  
Ahmad Safii
Keyword(s):  
Flexural Strength ◽  
Volume Fraction ◽  
Epoxy Composite ◽  
Good Alternative ◽  
Epoxy Composites ◽  
Fiber Breakage ◽  
Sem Images ◽  
Thermoset Composites ◽  
Interface Bond

Serat Corypha utan lamarck, yang kaya selulosa, murah, berlimpah memiliki potensi untuk penguatan pada komposit termoset. Penelitian ini bertujuan untuk menyelidiki sifat-sifat dari komposit epoksi berpenguatan serat Corypha utan lamarck. Pembuatan komposit telah dilakukan dengan menggunakan teknik vacuum bagging. Efek penambahan fraksi volume serat Corypha Utan (CU) dengan variasi 20, 25 dan 30 % (fraksi volume) terhadap morpologi, sifat kekuatan tarik dan lentur dari komposit telah diselidiki dan dianalisa. Hasil studi menunjukkan bahwa penambahan fraksi volume serat Corypha Utan secara siknifikan meningkatkan kekuatan tarik dan lentur dari komposit; dikarenakan penyebaran serat merata dalam resin, dan interface yang cukup kuat terbentuk antara serat dan epoksi. Komposit CU/epoksi dengan variasi fraksi volume serat 30% (spesimen  komposit CUh) memiliki nilai kekuatan dan modulus tarik sebesar tur paling tinggi sebesar 28.13 MPa dan 39.40 MPa, berturut-turut. Modulus lentur paling tinggi dimiliki oleh komposit dengan fraksi volume serat CU sebesar 30%. Analisa foto SEM memperlihatkan ikatan interface antara serat-epoksi dan fiber breakage. Hasil ini menunjukkkan bahwa komposit Cu/epoksi dapat menjadi alternatif  sebagai papan komposit komersil.  Corypha Utan fiber, which is rich cellulose, cheap and abundant has the potential for reinforcement in thermoset composites. This study aim is to investigate the properties of epoxy composites reinforced Corypha Utan fibers. The manufacture of composite has been done using vacuum bagging technique. The effect of increasing of the volume fraction of the Corypha utan fibers with variations of 20, 25 dan 30 % (volume fraction) on morphology, the tensile and flexural strength of composites have been investigated and analyzed. The results show that the increase of the volume fraction of Corypha utan fibers significantly increased tensile and flexural of composites; it is due to the dispersion of the fibers in epoxy, and interface bond between fiber and epoxy formed strong enough. The CU/epoxy composite with the volume fraction of the fiber of 30% (Composite CUh specimens) has the highest tensile and flexural strength value of 28,13 MPa and 39,400 MPa, respectively. The moduli’s flexural gives higher value at 30% volume fraction. SEM images demonstrate that interfacial adhesions between fiber-epoxy, and fiber breakage. The result suggests that Corypha utan fibers/epoxy composites can be a good alternative as commercial composites boards, especially for interior applications.

Study of Environmental Corrosion Behavior and Mechanism of the Carbon/Epoxy Composite

2007 ◽  
Vol 539-543 ◽  
pp. 913-918
Author(s):  
Xiao Fei Li ◽  
Qi Zhang ◽  
Jun Hua Xu
Keyword(s):  
Surface Layer ◽  
Composite Materials ◽  
Environmental Factors ◽  
Absorption Rate ◽  
Epoxy Composite ◽  
Advanced Technology ◽  
Advanced Materials ◽  
Effect Of Temperature ◽  
Corrosion Failure ◽  
Test Parameters

Polymer composite materials, as advanced materials have been widely used worldwide, especially in the advanced technology field, due to their outstanding properties. Nowadays, a growing attention has been paid to the environmental corrosion failure of composites. Since it is environment related corrosion, the test parameters selected were temperature, humidity and ultraviolet. Among all the environmental factors, the temperature, especially acts with humidity, is the most affective factor. In order to get detailed information, the weight gains of the samples tested were measured regularly during the test. By the comparison, it can be seen that the water absorption rate had been affected remarkably due to the salt existence or the temperature change. The observation of the sample microstructure showed that there were many holes on the surface, indicating that the surface of the samples was destroyed by the test, and that there were some interactions between the surface layer and the absorbed component. It is that only the effect of temperature and humidity was discussed in this paper, the effect of the rest environmental factors will be discussed in following paper.

Performance Improvement of Carbon Fiber Reinforced Epoxy Composite Sports Equipment

2021 ◽  
Vol 871 ◽  
pp. 228-233
Author(s):  
Xu Dong Yang ◽  
Fan Gu ◽  
Xin Chen
Keyword(s):  
Composite Materials ◽  
Carbon Fiber ◽  
Epoxy Composite ◽  
Matrix Cracking ◽  
Epoxy Composites ◽  
Fiber Reinforced ◽  
Carbon Fiber Reinforced ◽  
Pole Vault ◽  
Further Development ◽  
Positive Effect

This study is to explore the changes in the performance of sports equipment under the action of carbon fiber reinforced epoxy composites. This paper studies the effects of carbon fiber reinforced epoxy composites in pole vault, bicycle, and tennis. The research results show that the performance of sports equipment based on carbon fiber reinforced epoxy composite materials has been greatly improved, with outstanding effects in terms of thermal properties, interface properties, mechanical properties, and fatigue resistance. Carbon fiber reinforced epoxy composite material damage expansion is divided into five stages: matrix cracking, interfacial degumming, delamination, fiber fracture, fracture. Therefore, carbon fiber reinforced epoxy composite materials are comprehensive for the improvement of sports equipment, which has greatly promoted the further development of sports. Carbon fiber reinforced epoxy composite materials can be promoted in other fields, thereby obtaining greater progress with help of high technology. The study of carbon fiber reinforced epoxy composites in this paper has a positive effect on subsequent research.

Rheological Properties of Asbestos Waste Filler-Based Epoxy Composite Materials

2017 ◽  
Vol 737 ◽  
pp. 231-235
Author(s):  
M.A. Gavrilov ◽  
O.V. Tarakanov
Keyword(s):  
Composite Materials ◽  
Rheological Properties ◽  
Epoxy Composite ◽  
Epoxy Composites ◽  
Test Results ◽  
Natural Mineral ◽  
Technological Factors ◽  
Mineral Material ◽  
Mathematical Processing ◽  
Degree Of Filling

Buildings and structures susceptible to aggressive environmental and industrial factors are often protected by composite materials. The latter most notably include polymer-based composites. The rheological properties of filled epoxy composites with fillers based on construction and chemical industries’ waste, as well as composites based on natural mineral material, have been researched and accessed. Optimal degrees of filling for such composites have been determined. Border values of filling have also been determined. Authors attempt to determine the dependencies of rheological properties upon the degree of filling and technological factors. The microstructure of epoxy composite materials has also been taken into consideration. The specific features of deformability processes in of epoxy composite materials have been predicted. The mathematical processing of test results has been carried out.

DEGRADATION OF CARBON FIBER/EPOXY COMPOSITES BY XE LAMP AND HUMIDITY

2006 ◽  
Vol 20 (25n27) ◽  
pp. 3686-3691 ◽  
Author(s):  
XIAOJUN LV ◽  
QI ZHANG ◽  
GUOJUN XIE ◽  
GUANJIE LIU
Keyword(s):  
Shear Strength ◽  
Carbon Fiber ◽  
Epoxy Composite ◽  
Interlaminar Shear Strength ◽  
Epoxy Composites ◽  
Radiation Temperature ◽  
Transverse Tensile ◽  
Interlaminar Shear ◽  
Transverse Tensile Strength ◽  
Carbon Fiber Epoxy

In order to understand the effect of natural environmental factors on the carbon fiber/epoxy composites, the degradation of carbon fiber/epoxy composite was studied. The specimens were exposed in a Xe lamp chamber and suffered to ultraviolet light radiation, temperature and/or humidity conditions. The results show that the radiation, temperature and/or humidity could cause extensive corrosion to the surface and interior of the carbon/epoxy composite and attack the interface between matrix and carbon fiber, resulting in an obvious reduction of the transverse tensile strength and interlaminar shear strength. On the contrary, the longitudinal transverse shear strength was not affected much by the radiation, temperature and/or humidity. The results indicate that the radiation, temperature and/or humidity can result in the corrosion of the carbon/epoxy composite and consequently affect the mechanical properties of the carbon/epoxy composite partially.

Investigation of Flexural Characteristics of Flax and Abaca Hybrid Epoxy Composites

2015 ◽  
Vol 766-767 ◽  
pp. 183-186 ◽  
Author(s):  
B. Vijaya Ramnath ◽  
C. Elanchezhian ◽  
C.V. Jayakumar ◽  
V.M. Manickavasagam ◽  
U.S. Aswin ◽  
...  
Keyword(s):  
Electron Microscope ◽  
Composite Materials ◽  
Scanning Electron Microscope ◽  
Crack Propagation ◽  
Hybrid Composite ◽  
Epoxy Composite ◽  
Epoxy Composites ◽  
New Materials ◽  
Industrial Needs ◽  
Scanning Electron

Recent growth in the field of engineering demands specialised composite materials to meet various industrial needs. Composite materials are emerging as the most promising new materials. This paper deals with the fabrication and analysis of flexural characteristics of flax and Abaca hybrid epoxy composite. The show that GFRP + Flax +Abaca based hybrid composite has a higher ultimate stress which is much greater than GFRP + Flax composite and GFRP + Abaca composites. The inner filament breakage and crack propagation are studied using scanning electron microscope.

Sign in / Sign up

Export Citation Format

Share Document