Journal articles: 'Al composite'

1

Kala, Shiva Kumar, and Chennakesava Reddy Alavala. "Enhancement of Mechanical and Wear Behavior of ABS/Teflon Composites." Trends in Sciences 19, no. 9 (April 8, 2022): 3670. http://dx.doi.org/10.48048/tis.2022.3670.

Full text

Abstract:

In the present investigations, Most of the engineering applications of metallic materials are replaced by polymeric based composite materials. Because of the low cost and accessible handling of polymer composite materials such as Acrylonitrile butadiene styrene (ABS) matrix materials are used to make the composites with additions of filler enhance the properties of the matrix materials. In the present study, ABS matrix material is used to make the composite materials by adding the Teflon materials. Investigations are carried out to find the enhancement of the composites' mechanical properties. Optimizing the process parameters is done to identify the composite's most optimum used to get composite with better mechanical properties. SEM analysis and wear Debris are investigated to study the microscopic surface nature and behavior of the composites.

APA, Harvard, Vancouver, ISO, and other styles

2

Liang, Yun Xing, Li Chen, Hai Wen Liu, and Hua Wu Liu. "The Development of a High Elastic 3D Prefabricated Composite." Advanced Materials Research 332-334 (September 2011): 1773–76. http://dx.doi.org/10.4028/www.scientific.net/amr.332-334.1773.

Full text

Abstract:

With the development of modern technology, fiberglass composite materials are widely applied. The advantages of fiberglass reinforced composite materials are high strength and light weight. In order to produce a prefabricated fiberglass composite, a machine chart was drafted for weaving the 3D fiberglass fabric with five layers. The obtained five-layer 3D fabrics were composited with polyurethane matrix. Afterwards, the performance of the prefabricated composites was tested and the optimal ratio of fiberglass to matrix was determined by statistical analysis.

APA, Harvard, Vancouver, ISO, and other styles

3

a, Busoni, Moch Jonny Putra, Salim Ashar Hanafi, Riza Ummami, Bambang Piluharto, and Achmad Sjaifullah. "DOPANT, IMMERSION TIME EFFECT, AND HYDROLYSIS ONTO POLYANILINE/BACTERIAL- COMPOSITES: CONDUCTIVITY STUDIES." International Journal of Advanced Research 10, no. 09 (September 30, 2022): 853–62. http://dx.doi.org/10.21474/ijar01/15431.

Full text

Abstract:

The composite of conductive polyaniline was synthesized using the in situ chemical polymerization methods on cellulose to form PANI-cellulose composites. Polyaniline can be composited with a cellulose matrix (nata de coco) due to its abundance, low price, and environmental friendliness. Ammoniumperoxodisulfate (APS) was used as an initiator forthe oxidative polymerization of aniline. Characterization of PANI-Cellulose Bacterial composite was drawn using FT-IR and SEM, while the conductivity and electric quantities both using LCR-meter, FT-IR spectra, and SEM The PANI-cellulose bacterial composite with the various concentration dopant of H2SO4 methods has the highest conductivity than PANI-cellulose bacterial composite with the dopant of HCl methods.

APA, Harvard, Vancouver, ISO, and other styles

4

Thovichit, K., N. Chaiwong, I. Sukjumreansri, and T. Amornsakchai. "F-8 HIGH IMPACT STRENGTH COMPOSITE FROM POLYETHYLENE FIBER(Session: Composites II)." Proceedings of the Asian Symposium on Materials and Processing 2006 (2006): 123. http://dx.doi.org/10.1299/jsmeasmp.2006.123.

Full text

APA, Harvard, Vancouver, ISO, and other styles

5

Kustiningsih, Indar, Fajariswaan Nurrahman, Hasby Ashyra Rinaldi, Ipah Ema Jumiati, Denni Kartika Sari, and Jayanudin Jayanudin. "Synthesize Fe3O4-TiO2 Composite for Methyl Orange Photocatalytic Degradation." Materials Science Forum 1057 (March 31, 2022): 129–35. http://dx.doi.org/10.4028/p-9q4ts9.

Full text

Abstract:

The effect of Fe3O4 percentage on Fe3O4-TiO2 composite for methyl orange photocatalytic degradation has been investigated. Hydrothermal was carried out on TiO2 before being combined with Fe3O4 by precipitation method. The composites were characterized by means of Scanning Electron Microscope (SEM), X-ray diffraction (XRD) and UV-Vis diffuse and reflectance spectroscopy (UV-Vis DRS). The photocatalytic activity of Fe3O4-TiO2 composites were evaluated for methyl orange degradation. The addition of Fe3O4 to TiO2 could reduce the bandgap energy. The lowest bandgap energy was obtained at 20% Fe3O4-TiO2 composite. By using this composited, the degradation of methyl orange was 90%.

APA, Harvard, Vancouver, ISO, and other styles

6

Liu, Shih-Ming, Wen-Cheng Chen, Chia-Ling Ko, Hsu-Ting Chang, Ya-Shun Chen, Ssu-Meng Haung, Kai-Chi Chang, and Jian-Chih Chen. "In Vitro Evaluation of Calcium Phosphate Bone Cement Composite Hydrogel Beads of Cross-Linked Gelatin-Alginate with Gentamicin-Impregnated Porous Scaffold." Pharmaceuticals 14, no. 10 (September 29, 2021): 1000. http://dx.doi.org/10.3390/ph14101000.

Full text

Abstract:

Calcium phosphate bone cement (CPC) is in the form of a paste, and its special advantage is that it can repair small and complex bone defects. In the case of open wounds, tissue debridement is necessary before tissue repair and the subsequent control of wound infection; therefore, CPC composite hydrogel beads containing antibiotics provide an excellent option to fill bone defects and deliver antibiotics locally for a long period. In this study, CPC was composited with the millimeter-sized spherical beads of cross-linked gelatin–alginate hydrogels at the different ratios of 0 (control), 12.5, 25, and 50 vol.%. The hydrogel was impregnated with gentamicin and characterized before compositing with CPC. The physicochemical properties, gentamicin release, antibacterial activity, biocompatibility, and mineralization of the CPC/hydrogel composites were characterized. The compressive strength of the CPC/hydrogel composites gradually decreased as the hydrogel content increased, and the compressive strength of composites containing gentamicin had the largest decrease. The working time and setting time of each group can be adjusted to 8 and 16 min, respectively, using a hardening solution to make the composite suitable for clinical use. The release of gentamicin before the hydrogel beads was composited with CPC varied greatly with immersion time. However, a stable controlled release effect was obtained in the CPC/gentamicin-impregnated hydrogel composite. The 50 vol.% hydrogel/CPC composite had the best antibacterial effect and no cytotoxicity but had reduced cell mineralization. Therefore, the optimal hydrogel beads content can be 25 vol.% to obtain a CPC/gentamicin-impregnated hydrogel composite with adequate strength, antibacterial activity, and bio-reactivity. This CPC/hydrogel containing gentamicin is expected to be used in clinical surgery in the future to accelerate bone regeneration and prevent prosthesis infection after surgery.

APA, Harvard, Vancouver, ISO, and other styles

7

Panumati, S., T. Amornsakchai, and C. Ramesh. "F-9 HIGH STRENGTH POLYPROPYLENE FIBER FROM POLYPROPYLENE/CLAY COMPOSITE(Session: Composites II)." Proceedings of the Asian Symposium on Materials and Processing 2006 (2006): 124. http://dx.doi.org/10.1299/jsmeasmp.2006.124.

Full text

APA, Harvard, Vancouver, ISO, and other styles

8

Amaechi, Chiemela Victor, Cole Chesterton, Harrison Obed Butler, Nathaniel Gillet, Chunguang Wang, Idris Ahmed Ja’e, Ahmed Reda, and Agbomerie Charles Odijie. "Review of Composite Marine Risers for Deep-Water Applications: Design, Development and Mechanics." Journal of Composites Science 6, no. 3 (March 17, 2022): 96. http://dx.doi.org/10.3390/jcs6030096.

Full text

Abstract:

In recent times, the utilisation of marine composites in tubular structures has grown in popularity. These applications include composite risers and related SURF (subsea umbilicals, risers and flowlines) units. The composite industry has evolved in the development of advanced composites, such as thermoplastic composite pipes (TCP) and hybrid composite structures. However, there are gaps in the understanding of its performance in composite risers, hence the need for this review on the design, hydrodynamics and mechanics of composite risers. The review covers both the structure of the composite production riser (CPR) and its end-fittings for offshore marine applications. It also reviews the mechanical behaviour of composite risers, their microstructure and strength/stress profiles. In principle, designers now have a greater grasp of composite materials. It was concluded that composites differ from standard materials such as steel. Basically, composites have weight savings and a comparative stiffness-to-strength ratio, which are advantageous in marine composites. Also, the offshore sector has grown in response to newer innovations in composite structures such as composite risers, thereby providing new cost-effective techniques. This comprehensive review shows the necessity of optimising existing designs of composite risers. Conclusions drawn portray issues facing composite riser research. Recommendations were made to encourage composite riser developments, including elaboration of necessary standards and specifications.

APA, Harvard, Vancouver, ISO, and other styles

9

Öztaş, Saniye Karaman. "Fiber Reinforced Composite Materials in Architecture." Applied Mechanics and Materials 789-790 (September 2015): 1171–75. http://dx.doi.org/10.4028/www.scientific.net/amm.789-790.1171.

Full text

Abstract:

Composite materials are made from two or more constituent materials with significantly different physical or chemical properties. The materials work together to give the composite more excellent properties than its components.Fiber reinforced composite materials constitute a widely used group of the composites. There are many researches about fiber reinforced composites. This study focused on fiber reinforced composite materials used in architecture unlike other researches. It was aimed to specify the benefits of the fiber composite materials for architecture and discussed several recent developments related to these materials. A literature review was made by grouping composites materials. The study reported that more research is needed for fiber reinforced composites to improve their technical performance, environmental and economic properties.

APA, Harvard, Vancouver, ISO, and other styles

10

Lagerlof, K. P. D. "Transmission electron microscopy of composite materials." Proceedings, annual meeting, Electron Microscopy Society of America 46 (1988): 1012–15. http://dx.doi.org/10.1017/s0424820100107125.

Full text

Abstract:

Although most materials contain more than one phase, and thus are multiphase materials, the definition of composite materials is commonly used to describe those materials containing more than one phase deliberately added to obtain certain desired physical properties. Composite materials are often classified according to their application, i.e. structural composites and electronic composites, but may also be classified according to the type of compounds making up the composite, i.e. metal/ceramic, ceramic/ceramie and metal/semiconductor composites. For structural composites it is also common to refer to the type of structural reinforcement; whisker-reinforced, fiber-reinforced, or particulate reinforced composites [1-4].For all types of composite materials, it is of fundamental importance to understand the relationship between the microstructure and the observed physical properties, and it is therefore vital to properly characterize the microstructure. The interfaces separating the different phases comprising the composite are of particular interest to understand. In structural composites the interface is often the weakest part, where fracture will nucleate, and in electronic composites structural defects at or near the interface will affect the critical electronic properties.

APA, Harvard, Vancouver, ISO, and other styles

11

Noviyanti, Atiek Rostika, Efa Nur Asyiah, Muhamad Diki Permana, Dina Dwiyanti, Suryana, and Diana Rakhmawaty Eddy. "Preparation of Hydroxyapatite-Titanium Dioxide Composite from Eggshell by Hydrothermal Method: Characterization and Antibacterial Activity." Crystals 12, no. 11 (November 10, 2022): 1599. http://dx.doi.org/10.3390/cryst12111599.

Full text

Abstract:

Hydroxyapatite (HA) has been widely used in biomedical applications. HA is prepared from natural sources of eggshell. The obtained HA is composited with TiO2 using the hydrothermal method at a temperature of 230 °C. The structure and morphology of HA-TiO2 composites are characterized by X-ray diffraction (XRD), Fourier-transform infrared spectroscopy (FTIR), and a scanning electron microscope (SEM). Meanwhile, its antibacterial activity was tested on Staphylococcus aureus and Escherichia coli bacteria. The formation of the HA-TiO2 composite is evidenced by typical peaks on the XRD pattern for HA and TiO2. The FTIR spectrum shows that no bond formed between TiO2 and HA which indicates the formation of composites. The smallest crystallite size and the highest specific surface area were obtained from the composite with the composition of HA-TiO2 30:70. In addition, the composition of the composite also shows the smallest particle size distribution. Therefore, the presence of TiO2 plays a significant role in determining the HA properties formed. Furthermore, the HA-TiO2 composite showed good antibacterial activity using disk diffusion and optical density (OD) methods. These results indicate that the synergistic combination of HA from eggshell with TiO2 has favorable properties for antibacterial activity.

APA, Harvard, Vancouver, ISO, and other styles

12

Li, Ying Guang, C. Y. Fu, D. S. Li, and S. M. Wan. "The Composite Tool Design Technologies of Aircraft Composite Parts in Autoclave Forming." Advanced Materials Research 426 (January 2012): 330–34. http://dx.doi.org/10.4028/www.scientific.net/amr.426.330.

Full text

Abstract:

Aiming at the problems of composites of anisotropic, poor in dimensional and uneven temperature field in the designing of composite tool in autoclave, the techniques of designing the composite tool of aircraft components were constructed, involving in the following aspects: Taking advantage of design flexibility of composites, the thermal expansion coefficient between the moulding board and composite components matched. By analyzing the cure process curve of fiber-reinforced composites, the result that the crisis point without stress between component and tool, which the shape of composite component decided was concluded. By the temperature field analysis, and contrasted with the experimental results, the maximum difference was 4.95°C，after analysis, optimized the structure of the tool, obtaining the relatively uniform temperature field of the board.

APA, Harvard, Vancouver, ISO, and other styles

13

Kientzl, Imre, Imre Norbert Orbulov, János Dobránszky, and Árpád Németh. "Mechanical Behaviour Al-Matrix Composite Wires in Double Composite Structures." Advances in Science and Technology 50 (October 2006): 147–52. http://dx.doi.org/10.4028/www.scientific.net/ast.50.147.

Full text

Abstract:

The fibre reinforced metal matrix composites (FRMMC-s) are one of the main groups of the composite materials. The composite wires are continuous-fibre-reinforced aluminium matrix composites, which are made by a continuous process. Composite wires already have a few experimental applications for the reinforcement of high voltage electric cables. Other experimental application fields of these materials are the preferential reinforcement of the cast parts. In this way significant decrease in the weight could be achieved. The aim of this study is to show the excellent mechanical properties of the composite wires, and the contact relationship between the mechanical and other properties (i.e. thermoelectric power) and the possibility of their standardized production. The continuous production process of the composite wires and their test results were are shown as well. The difference between the composite wire reinforced double composite structures and direct fibre reinforced blocks were delineated as well. In this paper specimens were examined by tensile tests, bending tests, thermal aging tests and thermoelectric power measurement.

APA, Harvard, Vancouver, ISO, and other styles

14

McCoy, Laurel P., Patrick S. Market, Chad M. Gravelle, Charles E. Graves, Neil I. Fox, Scott M. Rochette, Joshua Kastman, and Bohumil Svoma. "Composites of Heavy Rain Producing Elevated Thunderstorms in the Central United States." Advances in Meteorology 2017 (2017): 1–19. http://dx.doi.org/10.1155/2017/6932798.

Full text

Abstract:

Composite analyses of the atmosphere over the central United States during elevated thunderstorms producing heavy rainfall are presented. Composites were created for five National Weather Service County Warning Areas (CWAs) in the region. Events studied occurred during the warm season (April–September) during 1979–2012. These CWAs encompass the region determined previously to experience the greatest frequency of elevated thunderstorms in the United States. Composited events produced rainfall of >50 mm 24 hr−1 within the selected CWA. Composites were generated for the 0–3 hr period prior to the heaviest rainfall, 6–9 hours prior to it, and 12–15 hours prior to it. This paper focuses on the Pleasant Hill, Missouri (EAX) composites, as all CWA results were similar; also these analyses focus on the period 0–3 hours prior to event occurrence. These findings corroborate the findings of previous authors. What is offered here that is unique is (1) a measure of the interquartile range within the composite mean fields, allowing for discrimination between variable fields that provided a strong reliable signal, from those that may appear strong but possess large variability, and (2) composite soundings of two subclasses of elevated thunderstorms. Also, a null case (one that fits the composite but failed to produce significant rainfall) is also examined for comparison.

APA, Harvard, Vancouver, ISO, and other styles

15

Spyrou, Maria, Eugenia Koliniotou-Koumpia, Pantelis Kouros, Elisabeth Koulaouzidou, and Pavlos Dionysopoulos. "The reparability of contemporary composite resins." European Journal of Dentistry 08, no. 03 (July 2014): 353–59. http://dx.doi.org/10.4103/1305-7456.137647.

Full text

Abstract:

ABSTRACT Objective: The objective was to investigate the way that various surface treatments could influence the bond strength of the repair of methacrylate (MC) and silorane (SIL) composites. Materials and Methods: A total of 160 MC and SIL cylindrical specimens were polymerized and aged in artificial saliva solution for 7 days. Depending on the following surface treatment (diamond bur or air abrasion), and the conditioning procedure (orthophosphoric acid or sodium hypochlorite), 16 groups were formed and repaired either with MC, either with SIL composite. Repaired specimens were subjected to an additional aging procedure in artificial saliva for 7 days, followed by thermo-cycling and then stressed in shear at a rate of 0.5 mm/min until failure. Failure patterns were analyzed using stereomicroscope and scanning electron microscopy. Results: MC composite showed statistically significant higher bond strength both as a base or repair material than SIL (P < 0.001). Statistically significant differences were not observed, when grinding and conditioning procedures was compared. Pretest failures were observed when aged MC-based composite was repaired with SIL-based. Conclusions: Type of composite seems to be the main factor influencing the bond strength of the repair. MC-based composite showed better repairability than SIL composite. Optimum repair conditions should include knowledge of the composite's composition.

APA, Harvard, Vancouver, ISO, and other styles

16

Markovičová, Lenka, and Viera Zatkalíková. "The Effect of Filler Content on the Mechanical Properties of Polymer Composite." Applied Mechanics and Materials 858 (November 2016): 190–95. http://dx.doi.org/10.4028/www.scientific.net/amm.858.190.

Full text

Abstract:

A composite material is a macroscopic combination of two or more distinct materials, having a recognizable interface between them. Modern composite materials are usually optimized to achieve a particular balance of properties for a given range of applications. Composites are commonly classified at two distinct levels. The first level of classification is usually made with respect to the matrix constituent. The major composite classes include organic – matrix composites (OMC's), metal – matrix composites (MMC's), and ceramic – matrix composites (CMC's). The OMC's is generally assumed to include two classes of composites: polymer – matrix composites (PMC's) and carbon – matrix composites [1]. The composite material used in the work belongs to the PMC's and the composite is formed by the polymer matrix - high density polyethylene. As filler was used hard-magnetic strontium ferrite. Composite samples were prepared with different filler content (0%, 60%, 70%, 80%). Testing of polymer composites included: tensile test, elongation at break, impact test, hardness test.

APA, Harvard, Vancouver, ISO, and other styles

17

Markovičová, Lenka, and Viera Zatkalíková. "Composites With Rubber Matrix And Ferrimagnetic Filling." System Safety: Human - Technical Facility - Environment 1, no. 1 (March 1, 2019): 776–81. http://dx.doi.org/10.2478/czoto-2019-0099.

Full text

Abstract:

AbstractA composite material is a macroscopic combination of two or more distinct materials, having a recognizable interface between them. Modern composite materials are usually optimized to achieve a particular balance of properties for a given range of applications. Composites are commonly classified at two distinct levels. The first level of classification is usually made with respect to the matrix constituent. The major composite classes include organic – matrix composites (OMC's), metal – matrix composites (MMC's), and ceramic – matrix composites (CMC's). The OMC's is generally assumed to include two classes of composites: polymer – matrix composites (PMC's) and carbon – matrix composites (Peters, 1998). The composite material used in the work belongs to the PMC's and the composite is formed by the polymer matrix – rubber (sidewall mixture). As filler was used hard-magnetic strontium ferrite. Composite samples were prepared with different filler content (20%, 30%, 40%, 50%). Testing of polymer composites included: tensile test, elongation at break, hardness test and study of morphology.

APA, Harvard, Vancouver, ISO, and other styles

18

Li, Guang, Gui Dong Luan, and Hao Qu. "Study on Novel Relaxor Ferroelectric Single Crystal PMNT/Epoxy Composite." Applied Mechanics and Materials 475-476 (December 2013): 1257–61. http://dx.doi.org/10.4028/www.scientific.net/amm.475-476.1257.

Full text

Abstract:

Use relaxor ferroelectric single crystals PMNT as piezoelectric phase, epoxy resin as a non-piezoelectric phase material, take the cutting - filling method fabricated piezoelectric composite. Its structure character is achieved 1-3 type piezoelectric composites and piezoelectric crystal substrate composite again inseries by the integration, the composite horizontal and vertical bracket to be supported by piezoelectric crystal frame, it has a good impact resistance and affected by changes in ambient temperature characteristics. This composite material both has the advantages of 1-3 type composites, and has stable mechanical and thermal properties. Based on R.E.Newnhams series-parallel theory, combined with the structural characteristics of this composite, given the formula of piezoelectric composites density, piezoelectric constant, and dielectric constant. Fabricated the PMNT / epoxy composites and piezoelectric PZT / epoxy piezoelectric composite materials samples, which have the same scale, the same structural parameters. The experimental results show that, the piezoelectric composite test parameter values match theoretical calculations. The PMNT/epoxy composite has batter function than PZT/epoxy composite.

APA, Harvard, Vancouver, ISO, and other styles

19

Durga Prasada Rao, V., G. Moses Dayan, and V. Navya Geethika. "Study of hardness and flexural strength of banyan and peepal fibre reinforced hybrid composites." MATEC Web of Conferences 172 (2018): 04009. http://dx.doi.org/10.1051/matecconf/201817204009.

Full text

Abstract:

In the present work, Banyan and Peepal fibre reinforced hybrid composites are prepared through hand Lay- up technique..The objective of the work is to investigate the hardness and flexural properties of eight varieties of banyan – peepal hybrid composites. The composites include banyan-peepal-banyan-peepal-banyan fibre composite, peepal-banyan-peepal-banyan-peepal fibre composite, banyan-copper-banyan-copper-banyan fibre composite (F1-Cu-F1-Cu-F1), peepal-copper-peepal-copper-peepal fibre composite, banyan-peepal-copper-peepal-banyan fibre composite, peepal-copper-banyan-copper-peepal fibre composite, peepal-banyan-copper-banyan-peepal fibre composite, and banyan-copper-peepal-copper-banyan fibre composite . Each of these composites is prepared in 00 orientations (i.e., fibres parallel each other), 450 (i.e., fibres at 450 to each other) and 900 orientations (i.e., fibres perpendicular to each other). It is observed from the results that, the hardness of F2-Cu-F1-Cu-F2 composite with 900 orientation is high and that of F1-F2-F1-F2-F1 composite with 450 orientation is low. It is also noticed that, the bending strength of F2-Cu-F1-Cu-F2 composite with 00 orientation is high and that of F2-F1-F2-F1-F2 composite with 450 orientation is low, and as far as the composites with 90⁰ orientations are considered, no results are obtained. Further it is noticed that, the hardness of all the eight composites with 90˚ orientation is found to be high compared to their remaining orientations and also the hardness of all the composites with 45˚ orientation is low compared to their 0˚ and 90˚ orientations

APA, Harvard, Vancouver, ISO, and other styles

20

Uysal, Tancan, Mustafa Ulker, Asli Baysal, and Serdar Usumez. "Different Lingual Retainer Composites and the Microleakage between Enamel-Composite and Wire-Composite Interfaces." Angle Orthodontist 78, no. 5 (September 1, 2008): 941–46. http://dx.doi.org/10.2319/072707-350.1.

Full text

Abstract:

Abstract Objective: To assess microleakage of enamel-composite and wire-composite interfaces when retainer wires were bonded with two orthodontic and a flowable composites. Materials and Methods: Forty-five freshly extracted human mandibular canine teeth were used in this study. Teeth were separated into three groups of 15 teeth each. Round stainless-steel wire of 0.36-in. diameter in three groups was bonded to enamel by Transbond XT (3M Unitek), Transbond LR (3M Unitek), and Venus Flow (Heraeus Kulzer) composites. Specimens were further sealed with nail varnish, stained with 0.5% basic fuchsine for 24 hours, sectioned and examined under a stereomicroscope, and scored for microleakage for the enamel-composite and wire-composite interfaces from mesial and distal margins. Statistical analysis was performed by Kruskal-Wallis and Mann-Whitney U-tests. Results: Little or no microleakage was determined at the mesial and distal sides for three composites in two different interfaces, and these findings were not statistically significant (P > .05). No statistically significant differences were observed among all composite groups for the microleakage with either of the interfaces. Venus Flow in the enamel-composite interface and Transbond LR in the wire-composite interface exhibited no microleakage. Conclusion: The presence of wire in the mesial portion of the lingual retainer did not increase the microleakage at the enamel-composite and wire-composite interfaces in all groups. The microleakage results in this study support the use of all these composites in routine orthodontic practice.

APA, Harvard, Vancouver, ISO, and other styles

21

Subuki, Istikamah, Suffiyana Akhbar, and Farrah Khalidah Nor Wahid. "Influence of Thermoplastic PEG, GLY and Zein in PCL/TZ and HAp Bio Composite via Solid State Supercritical CO2 Foaming." Scientific Research Journal 17, no. 2 (August 27, 2020): 177. http://dx.doi.org/10.24191/srj.v17i2.9534.

Full text

Abstract:

This study is aimed to investigate the characteristics of the composite containing blended poly (ɛ-caprolactone) (PCL), hydroxyapatite (HA) and thermoplastic zein (TZ). Thermoplastic zein was developed by mixing zein with glycerol (GLY) and polyethylene glycol (PEG). The thermal characterization of mixed TZ and bio composite was characterized in order to investigate the characterization of PCL/TZ/HA composites. The bio composited was then moulded and produce porous structure via solid state supercritical carbon dioxide (scCO2) foaming process. The specimen was saturated with CO2 for 6 hours at 50˚C and saturation pressure of 20MPa at high depressurization rate. The morphology of porous specimen produced were characterized by scanning electron microscopy (SEM). The results indicated that after polymer saturation with CO2, high depressurization causes the formation of nucleated gas cells that give rise to pores within the foamed specimens. The blended bio composite with composition of PCL60/TZ20/HAp20 exhibit well interconnected porous structure compared to other bio composite prepared. The foaming effect produce foams with heterogeneous morphologies on bio composite material at relatively low temperature.

APA, Harvard, Vancouver, ISO, and other styles

22

Chen, Jieng-Chiang, and Bo-Yan Huang. "Flame-retardant corrugated paper/epoxy composite materials." Modern Physics Letters B 33, no. 14n15 (May 28, 2019): 1940004. http://dx.doi.org/10.1142/s0217984919400049.

Full text

Abstract:

The waterproof and flame-retardant properties of corrugated paper (CP) reinforced epoxy resin sandwich composites are discussed. Two composites, a CP-reinforced epoxy composite (CP/E composite) and a CP-reinforced flame-retardant epoxy composite (CP/FRE composite), were developed in this study. A dipping bath was developed for impregnating the paper with epoxy and a flame-retardant epoxy solution to make the CP/P and CP/FRE composite panels. A room-temperature-cured epoxy resin was blended with various contents (10%, 20%, and 30%) of phosphorus-based flame-retardant compounds and then was used as a matrix to make CP/FRE-10, CP/FRE-20, and CP/FRE-30 composite materials. Water absorption tests of these composites were used to estimate the waterproof properties. In addition, vertical and horizontal burning tests were used to evaluate the flame-retardant properties of the composites.

APA, Harvard, Vancouver, ISO, and other styles

23

Jong, Lei. "Mechanical properties of heterophase polymer blends of cryogenically fractured soy flour composite filler and poly (styrene–butadiene)." Journal of Elastomers & Plastics 44, no. 3 (January 5, 2012): 273–95. http://dx.doi.org/10.1177/0095244311428894.

Full text

Abstract:

Reinforcement effect of cryogenically fractured soy flour composite filler in soft polymer was investigated in this study. Polymer composites were prepared by melt-mixing polymer and soy flour composite fillers in an internal mixer. Soy flour composite fillers were prepared by blending aqueous soy flour dispersion and styrene–butadiene rubber latex to form a mixture, which was then dried and cryogenically ground into powders. Upon cross-linking, the heterophase composite filler was integrated into rubber polymer and exhibited enhanced mechanical properties. Tensile strength, elongation, Young’s modulus, toughness, and tear resistance of the heterophase polymer composites were better than those of the polymer matrix. The composites reinforced by the composite fillers prepared with different polymer matrices showed that the composite filler prepared with styrene–butadiene instead of carboxylated styrene–butadiene matrix produced composites with greater elongation ratio and toughness but smaller Young’s modulus. The study of elongation rate showed that the soy flour composite fillers produced the composites with useful tensile strength, elongation ratio, and toughness at 500 mm/min strain rate. The study also showed that the effect of soy flour/polymer ratio of the composite fillers on the composite mechanical properties was small.

APA, Harvard, Vancouver, ISO, and other styles

24

Islam, MT, MT Meem, ME Haque, GT Rahman, MA Hoque, and MA Gafur. "A Study on the Mechanical, Optical and Electrical Properties of Nylon-Mesh/Epoxy Composite." Bangladesh Journal of Physics 27, no. 2 (March 10, 2022): 49–57. http://dx.doi.org/10.3329/bjphy.v27i2.57666.

Full text

Abstract:

We fabricated the nylon-mesh reinforced epoxy composite by using the hand lay-up method. In this composite, nylon mesh act as the reinforcing material whereas epoxy resin is the matrix material. Comparisons have been made between blank epoxy sheet and the composite. We observed improved mechanical properties such as tensile strength, strain, hardness, and flexural strength from the composited rather than blank epoxy sheet. However, Young’s modulus was not found promising. In case of optical observations, Light absorbance increases, and optical band gap decreases slightly. Considering the Electrical properties, we observed better electrical insulation properties from our fabricated composite than the blank epoxy sheet. In addition, the water absorption properties have also been discussed in this research article. These observations of different properties will contribute to open the new wings of many new applications and help to further improve the quality of the composites. Bangladesh Journal of Physics, 27(2), 49-57, December 2020

APA, Harvard, Vancouver, ISO, and other styles

25

Hamada, Hiroyuki, Akihiro Fujita, Zenichiro Maekawa, and Masaya Kotaki. "Bending Properties of 3D Glass Woven Fabric Reinforced Composites." Advanced Composites Letters 2, no. 4 (July 1993): 096369359300200. http://dx.doi.org/10.1177/096369359300200406.

Full text

Abstract:

3D glass woven fabric (PARABEAM) reinforced composites are of particular interest to composite industry, because light weight large scale composite structures can be fabricated. Bending properties of hybrid composites with 3D fabric and chopped strand mat were possible to be estimated by using theory of composite beam. The relations between thickness, weight and bending properties of the 3D composites could be drawn for designing composite structure.

APA, Harvard, Vancouver, ISO, and other styles

26

Abdelal, Nisrin R., and Steven L. Donaldson. "Interlaminar fracture toughness and electromagnetic interference shielding of hybrid-stitched carbon fiber composites." Journal of Reinforced Plastics and Composites 37, no. 18 (July 18, 2018): 1131–41. http://dx.doi.org/10.1177/0731684418787642.

Full text

Abstract:

In the current study, the production of multifunctional hybrid-stitched composites with improved interlaminar fracture toughness and electromagnetic interference shielding effectiveness is reported. Unidirectional carbon fiber-epoxy composite laminates stitched with Kevlar, nylon, hybrid stitched with both Kevlar and nylon and unstitched were prepared using resin infusion process. Representative specimens from unstitched and stitched composites were tested using rectangular waveguide and Mode I double cantilever beam tests. The Mode I experimental results showed that composite stitched with Kevlar exhibited the highest crack initiation interlaminar fracture toughness (GIC-initiation), whereas composite stitched with nylon exhibited the highest maximum crack propagation interlaminar fracture toughness (GIC-maximum). The four-hybrid stitching patterns exhibited higher GIC-initiation than the unstitched and stitched with nylon composites and lower than stitched with Kevlar composite, whereas they had higher GIC-maximum than the unstitched and stitched with Kevlar composites, although lower than stitched with nylon composite. The electromagnetic shielding effectiveness experimental results showed that stitched composites exhibited improved shielding effectiveness compared to unstitched composites. For example, composite stitched with nylon had highest shielding effectiveness value of 52.17 dB compared by the composite stitched with Kevlar which had 40.6 dB. The four hybrid-stitched composites exhibited similar shielding effectiveness with an average value of 32.75 dB compared to the unstitched composite shielding effectiveness of 22.84 dB. The experimental results comply with the initial goal of this study to manufacture multifunctional hybrid stitching composites with combined properties between Kevlar and nylon-stitched composites.

APA, Harvard, Vancouver, ISO, and other styles

27

Stelzer, Steffen, Stephan Ucsnik, and Gerald Pinter. "Composite-Composite Joining with through the Thickness Reinforcements for Enhanced Damage Tolerance." Materials Science Forum 825-826 (July 2015): 883–90. http://dx.doi.org/10.4028/www.scientific.net/msf.825-826.883.

Full text

Abstract:

A novel composite-composite joining technology based on metal pins oriented in through thickness direction of the composites is presented. A defined pin geometry, which is capable of establishing a through-thickness form-fit connection between composites and the metal reinforcement, is created on thin metal sheets in an automated pin production process. Based on numerical simulations of the fracture of unreinforced single lap shear (SLS) composite specimens, optimum locations for the pin reinforcement were found. Tests on reinforced SLS specimens proved that an enhanced damage tolerance can be achieved by the use of cold metal transfer welded pins (CMT pins) as through-the-thickness reinforcement of the joint area. This paper investigates the mechanisms responsible for the load transfer and failure of such through-the-thickness reinforced composite-composite joints during monotonic loading.

APA, Harvard, Vancouver, ISO, and other styles

28

Aloqaili, Murtadha Jaafar, and Rahim Alhamzawi. "Bayesian Composite Quantile Regression with Composite Group Bridge Penalty." NeuroQuantology 20, no. 2 (February 28, 2022): 173–79. http://dx.doi.org/10.14704/nq.2022.20.2.nq22269.

Full text

Abstract:

We study composite quantile regression (CQReg) with composite group bridge penalty for model selection and estimation. Compared to conventional mean regression, composite quantile regression (CQR) is an efficient and robust estimation approach. A simple and efficient algorithm was developed for posterior inference using a pseudo composite asymmetric Laplace distribution which can be formulated as a location-scale mixture of normals. The composite group bridge priors were formulated as a scale mixture of multivariate uniforms. We assess the performance of the proposed method using simulation studies, and demonstrate it with an air pollution data. Results indicated that our approach performs very well compared to the existing approaches.

APA, Harvard, Vancouver, ISO, and other styles

29

Chen, Jieng-Chiang. "Bending and impacting of sandwich composites with a corrugated paper core layer." International Journal of Modern Physics B 32, no. 19 (July 18, 2018): 1840057. http://dx.doi.org/10.1142/s021797921840057x.

Full text

Abstract:

The bending and impacting characteristics of sandwich composites containing corrugated paper (CP) as a core layer are discussed herein. The core layer of the sandwich composite was fabricated with CP-reinforced polylactic acid (PLA) resin. The core layer was then stacked with jute fabric and PLA films on the top and bottom surfaces to fabricate the sandwich composites. Two composites [CP-reinforced PLA composite (CP/PLA composite)] and jute fabric/PLA sandwich composite with CP as a core layer [J/PLA/CP composite] were developed in this study. To manufacture the CP/PLA composite core layer, a dipping bath was used for impregnating the paper with a molten PLA solution. The resin film method combined with a hot press was used to produce the jute fabric/PLA/CP sandwich composites. A material test system (MTS810) was used to study the bending properties of the composites. Further, an IZOD impacting instrument was used to examine the impacting characteristics of the composites. Both the CP/PLA and jute fabric/PLA/CP sandwich composites increase the energy absorption capacity in the impact test.

APA, Harvard, Vancouver, ISO, and other styles

30

Kumari, Sanju, Ritesh Kumar, Bhuvneshwar Rai, and Gulshan Kumar. "Development of Euphorbia Latex and Bamboo Fiber Based Green Composite." Journal of Nanoscience and Nanotechnology 20, no. 8 (August 1, 2020): 5282–87. http://dx.doi.org/10.1166/jnn.2020.18534.

Full text

Abstract:

Novel composites with improved mechanical strength, thermally stability and better biodegradability were fabricated using polyester resin (PR) and euphorbia coagulum (EC) with natural bamboo fiber (BF) by a compression molding technique. The addition of EC makes the composite more pronounced for alkali-treated BF. The composites were characterized in terms of water absorption, mechanical, thermal and biodegradability. Composites showed considerable improvement in thermal stability, mechanical properties (flexural strength and impact strength) and biodegradability. EC modified composite shows maximum improvement in physico-mechanical properties compared to other composites. The inoculation of EC modified and unmodified composite with fungi resulted in higher growth on modified composite compared to unmodified composite. These novel composites could be labeled as sustainable material because they were prepared from low-cost BF and EC through a green approach. The composite material developed can be used in building constructions as wood substitution, automotive parts, sports goods, etc.

APA, Harvard, Vancouver, ISO, and other styles

31

Schalek, Richard L., John Helmuth, and Lawrence T. Drzal. "Evaluation of Boron Nitride Coated Nextel 312TM Fiber/BlackglasTM Composites Using an Environmental SEM." Microscopy and Microanalysis 4, S2 (July 1998): 282–83. http://dx.doi.org/10.1017/s143192760002153x.

Full text

Abstract:

The most critical technical issue preventing large scale application of ceramic matrix composites is the cost-effective application of stable interface coatings on continuous ceramic fibers. Currently, an alumina-silica ceramic fiber containing up to 14 wt. % boria (Nextel 312TM) is composited at elevated temperatures to form a boron nitride (BN) coating on the fiber surface. This BN coating serves as a compliant layer facilitating crack deflection and producing a non-catastrophic failure mode. Continued development of these ceramic matrix composites requires a more complete understanding of the mechanistic paths involved in composite densification. The objective of this work is to investigate and more clearly describe the role of the BN coating and its relation to composite processing and properties of the densified Nextel 312TM fiber/BlackglasTM (silicon oxycarbide) composites.Three composites consisting of as-received fibers (coated with an organic sizing), desized fibers (sizing removed by heating), and boron nitride coated fibers were fabricated using BlackglasTM preceramic polymer 489C B-stage resin.

APA, Harvard, Vancouver, ISO, and other styles

32

Syifa, Naila Hilmiyana, Agus Yulianto, and Upik Nurbaiti. "Pembuatan dan Karakterisasi Sifat Fisis Komposit Multilayer Serat Rami." Jurnal Pendidikan Fisika dan Teknologi 7, no. 2 (October 23, 2021): 87–95. http://dx.doi.org/10.29303/jpft.v7i2.2783.

Full text

Abstract:

The use of composites as an innovative new material is increasing. Composites are made from two or more materials that have different properties. This research was conducted to make multilayer composites and determine the effect of variations in the number of arrangements and the direction of the fiber angles on the physical properties of composites made from ramie fiber and epoxy. The physical properties of the composites analyzed in this study were density, porosity, water absorption, and thickness expansion. The composites in this study were made using the hand layup method with a volume fraction ratio of 30% and the ratio of epoxy and hardener was 2: 1. Before the composite was made, ramie fibers were soaked in 5% NaOH for 2 hours. This study succeeded in making epoxy ramie multilayer composites with variations in the number of arrangements and the direction of the fiber angles. Variations in the number of layers and the direction angle of the ramie fiber in the composite affect the density and porosity of the composite. Variations in the direction of the ramie fiber in the composite affect the water absorption of the composite. Variations in the number and direction of ramie fiber in the composite did not significantly affect the thickness of the composite.

APA, Harvard, Vancouver, ISO, and other styles

33

Stupnytskyi, R., I. Molojanov, N. Tkachuk, A. Zvolynska, and A. Bozhyk. "The long-term restoration of molars: consequeces, prognosis, tactics." SUCHASNA STOMATOLOHIYA 104, no. 5 (2020): 16–21. http://dx.doi.org/10.33295/1992-576x-2020-5-16.

Full text

Abstract:

Abstract: modern dentistry have made serious progress in esthetic restoration using the latest modified composist. Nowadays the composit restoration can be done and look like as a perfect prosthetic construction, that means we can provide high esthetics and function. But sometimes in our country we continue to use composite restoration, using the latest types of adhesive components in vital or devitalized morals, where the prosthetic pestoration is needable. Its very important to notice that most of composite restoration of our patients are done in vital affected morals, or more often, in devitalized morals.

APA, Harvard, Vancouver, ISO, and other styles

34

Muthukumar, V., R. Venkatasamy, V. Mariselvam, A. Sureshbabu, N. Senthilkumar, and A. Antony George Fernando. "Comparative Investigation on Mechanical Properties of Natural Fiber Reinforced Polyester Composites." Applied Mechanics and Materials 592-594 (July 2014): 92–96. http://dx.doi.org/10.4028/www.scientific.net/amm.592-594.92.

Full text

Abstract:

The aim of present experimental investigation is to compare the mechanical properties of Sisal, jute and kenaf fiber reinforced with glass fiber in polyester matrix hybrid composites. Hybrid composites were fabricated by hand lay-up technique. The tensile, flexural and impact tests were carried out on different composite samples as per the ASTM standards. It was observed that the tensile strength of jute/glass fiber composite is 1.94 and 1.59 times more than that of sisal/glass and kenaf/glass composites, respectively. The flexural load carrying capacity of sisal/glass composite is 3.4 and 2.83 times greater than those of jute/glass and kenaf/glass composites, respectively. Also, it can be seen that impact strength of jute/glass composite is almost equal to that of kenaf/glass composite and 1.13 times more than that of sisal/glass composite.

APA, Harvard, Vancouver, ISO, and other styles

35

Hanado, H., Yutaka Hiraoka, Takeshi Inoue, and N. Akiyoshi. "Mechanical Properties of W-X (X=Cu, Ag or BAg-8) Composites." Materials Science Forum 534-536 (January 2007): 905–8. http://dx.doi.org/10.4028/www.scientific.net/msf.534-536.905.

Full text

Abstract:

Bend tests were performed at temperatures between 273 and 363 K for W-19vol%Cu, W-22vol%Ag and W-19vol%(BAg-8) composites. Yield and/or maximum strengths and ductility of the composite were discussed in terms of microstructure and fractography. Results are summarized as follows. (1) Almost no difference was recognized in yield strength between the composites. In contrast, a large difference was recognized in maximum strength and ductility between the composites. Maximum strength and ductility of W-Ag and W-(BAg-8) composites were generally much inferior to those of W-Cu composite. (2) Inferior mechanical properties of W-Ag composite to W-Cu composite are attributed to heterogeneous distribution of Ag-phases, whilst inferior mechanical properties of W-(BAg-8) composite to W-Cu composite are attributed to large pores at grain boundaries.

APA, Harvard, Vancouver, ISO, and other styles

36

Abrate, Serge. "Composite structures: impact on composites 2002." Composite Structures 61, no. 1-2 (July 2003): 1. http://dx.doi.org/10.1016/s0263-8223(03)00026-6.

Full text

APA, Harvard, Vancouver, ISO, and other styles

37

Ni, Nan Nan, Yue Fang Wen, De Long He, Miao Cai Guo, and Xiao Su Yi. "Preparation and Characterization of Structural Damping Composites Toughened by Polyamide Nonwoven Fabrics." Materials Science Forum 848 (March 2016): 189–95. http://dx.doi.org/10.4028/www.scientific.net/msf.848.189.

Full text

Abstract:

A new kind of structural damping composites was prepared by interleaving polyamide nonwoven fabrics (PNF) between the carbon fiber reinforced epoxy composite laminates. The damping behaviors of the composites made were experimentally investigated using cantilever beam test and dynamic mechanical analysis. The damping ratios of the nonwoven fabrics interleaved composites were compared with the ones of non-interleaved composites. In addition, the interlaminar shear strength and flexible modulus of the composites were also investigated, as well as the composite compression after impact (CAI), Mode I and Mode II interlaminar fracture toughness (GIC and GIIC), in order to evaluate the influence of the polyamide nonwoven fabric layers on the composite mechanical properties. It has been observed that the interleaved polyamide nonwoven fabric layers greatly improved the composite damping loss factors, and the composites containing 7 layers of PNF showed the best damping behavior. Meanwhile, the addition of PNF showed a negligible influence on the composite flexible strength and modulus and interlaminar shear strength. Most importantly, the CAI, GIC and GIIC tests indicated that the composite interlaminar toughness and impact resistance were significantly improved by the interleaved PNF. Finally, the reinforcing mechanism of this kind of composites is discussed.

APA, Harvard, Vancouver, ISO, and other styles

38

Grzymski, Filip, Dorota Marcinczak, Tomasz Trapko, and Michał Musiał. "FRCM composites mesh anchorage – a way to increase strengthening effectiveness." MATEC Web of Conferences 251 (2018): 02044. http://dx.doi.org/10.1051/matecconf/201825102044.

Full text

Abstract:

FRCM (Fabric Reinforced Cementitious Matrix) composites are the next stage of development of composite structural reinforcement after FRP (Fibre Reinforced Polymers) composites. The main element that distinguishes the newer FRCM system is the matrix of the composite – mineral matrix instead of epoxy resin. Changes in the structure of the composite, resulting from the change of the matrix, have a big impact on its work mechanisms. This paper discusses FRCM composites and shows its effectiveness in reinforced concrete elements strengthening. The basic information on FRCM mesh fibres material differences and composite failure modes are given. Current trends and directions of composite structural strengthening and the latest research in the area of increasing FRCM composite strengthening effectiveness, that are being conducted by the authors, are presented.

APA, Harvard, Vancouver, ISO, and other styles

39

Chen, Jieng-Chiang, and Yi-Ting Lin. "Tension and compression of jute fabric/corrugated paper/reinforced polylactic acid resin sandwich composites." Modern Physics Letters B 33, no. 14n15 (May 28, 2019): 1940003. http://dx.doi.org/10.1142/s0217984919400037.

Full text

Abstract:

The tensile and compressive properties of jute fabric and corrugated paper (CP)-reinforced polylactic acid (PLA) resin sandwich composites are discussed. A core layer was fabricated with CP-reinforced PLA resin. The core later was then stacked with jute fabric and PLA films on the top and bottom surfaces to fabricate the sandwich composites. Two composites, a CP-reinforced PLA composite (CP/PLA composite) and a jute fabric/PLA sandwich composite with CP as a core layer (J/PLA/CP composite) were developed in this study. A dipping bath was developed for impregnating the paper with a molten PLA solution to make the CP/PLA composite core layer. The resin film method was used to fabricate the jute fabric/PLA/CP sandwich composite on a hot press machine. A material test system (MTS810) was used to evaluate the tensile, flatwise compression, and longitudinal compressive characteristics of the composites.

APA, Harvard, Vancouver, ISO, and other styles

40

Epaarachchi, Jayantha Ananda, and Matthew T. Reushle. "Performance of Aluminium / Vinylester Particulate Composite." Materials Science Forum 654-656 (June 2010): 2656–59. http://dx.doi.org/10.4028/www.scientific.net/msf.654-656.2656.

Full text

Abstract:

The performances of aluminum /vinylester particulate-composites were studied in detail in order to investigate its suitability for engineering applications. This study examined the suitability of atomised aluminum particles for particulate reinforcement of a vinyl ester resin. Mechanical properties were obtained for the composite by testing various percentages of aluminium powder (75-150 m) and vinylester resin. It has been found that the inclusion of Al powder has not significantly changed the properties of vinylester resin, however an improvement in the ductility of the composite has been recorded. The optimal performances of the composite were exhibited by 15% Al composition. The properties of the particulate composites were modeled using numerous empirical models. Unfortunately a significant difference was found between some of the experimental and predicted properties of the Al/vinylester particulate composite. This paper intends to detail the variation of mechanical properties with the change of Al volume fraction in the composite and the performances of empirical models in prediction of the properties of particulate composites.

APA, Harvard, Vancouver, ISO, and other styles

41

Okafor, Patricia, and Jude Iroh. "Electrochemical Properties of Porous Graphene/Polyimide-Nickel Oxide Hybrid Composite Electrode Material." Energies 14, no. 3 (January 23, 2021): 582. http://dx.doi.org/10.3390/en14030582.

Full text

Abstract:

Polyimide-graphene nanosheet composite electrodes are rigid and dense and, therefore, exhibit moderate electrochemical properties. The electrochemical properties of polyimide-graphene nanosheet electrodes were remarkably improved by creating voids in the composite followed by the insertion of nickel oxide into the composites. Nickel oxide particles were electrodeposited onto the porous graphene/poly(amic acid) composite, containing poly (acrylic resin). The hybrid composite was then subjected to thermal treatment at ≥ 300 °C to simultaneously complete imidization and degrade the poly (acrylic resin). Cyclic Voltammetry (CV) and electrochemical impedance spectroscopy (EIS) were used to study the eletrochemical properties of the composite electrode material. It is shown that remarkable improvement in the electrochemical behavior of the hybrid composite occurred due to the removal of poly(acrylic acid) and the insertion of NiO particles into the polyimide matrix. Fourier Transform Infrared Spectroscopy (FTIR) spectra of the hybrid composites show distinct characteristic peaks for polyimide and NiO in the hybrid composite electrode. Scanning Electron Microscopy, SEM images of the composites, show the presence of NiO aggregates in the composite material. Compared to neat graphene/polyimide composite electrode (GR/PI) composites, the specific capacitance of the hybrid composite electrode increased remarkably by over 250% due to the high interfacial surface area provided by NiO and the concomitant improvement in the electrode–electrolyte interaction.

APA, Harvard, Vancouver, ISO, and other styles

42

Tantbirojn, D., C. Fernando, and A. Versluis. "Failure Strengths of Composite Additions and Repairs." Operative Dentistry 40, no. 4 (June 1, 2015): 364–71. http://dx.doi.org/10.2341/14-042-l.

Full text

Abstract:

SUMMARY Purpose When adding composite to a cured composite restoration, the intent is to achieve the same failure strength as the original restorative material. This study evaluated the failure strengths of added or repaired composite using various chemical and/or mechanical surface treatments. Methods Failure strengths were determined using a four-point bending test. Beam-shaped specimens were fabricated by adding new composite to cured composite (Filtek Supreme Ultra). The cured composites were either fresh or aged seven days (N=10-14). The composite surfaces were left unground or were ground before treatment with various combinations of roughening, acid etching, silane, and dental adhesives (conventional Adper SingleBond Plus or new multimode Scotchbond Universal) and/or tribochemistry (CoJet system). Monolithic composite specimens were the control. Failure strengths were statistically analyzed using one-way analysis of variance and the Fisher protected least significant difference (α=0.05). Results Failure strengths (mean ± standard deviation) when composite was added to unground freshly cured composites (111±25 MPa) and aged composites using a new multimode adhesive with (102±22 MPa) or without (98±22 MPa) tribochemical treatment were not significantly lower than the monolithic specimens (122±23 MPa). Grinding the surfaces of freshly cured composite significantly reduced failure strength, either with (81±30 MPa) or without (86±31 MPa) use of conventional adhesive. Failure strengths of aged composites were also significantly lower (51±21 MPa with SingleBond Plus), even after tribochemical treatment (71±29 MPa with SingleBond Plus; 73±35 MPa with Silane-Visiobond). Conclusions Using a new multimode adhesive when adding composite to freshly cured or aged composite substrates recovered the failure strength to that of the original monolithic composite.

APA, Harvard, Vancouver, ISO, and other styles

43

Dwi Atmaja, Widyapramana. "The Difference of Microleakage Between One-Bulkfill Resin Composite and Conventional Resin Composite." Insisiva Dental Journal: Majalah Kedokteran Gigi Insisiva 11, no. 2 (November 26, 2022): progress. http://dx.doi.org/10.18196/di.v11i2.16060.

Full text

Abstract:

Resin composites are the most commonly used restorative materials and are constantly evolving due to their shortcomings which can affect the restoration results in polymerization shrinkage, leading to the formation of microleakage. Although incremental techniques have been found, this technique has drawbacks regarding the time required and the possibility of contamination. The invention of bulk fill resin composite can solve this problem. Manufacturers of One-Bulkfill (3M ESPE) claim that this material has less polymerization shrinkage than conventional resin composites, which is expected to have less chance of microleakage. This study aims to determine the difference in microleakage between one-bulkfill resin composites and conventional resin composites. 20 extracted premolars without caries and anomalies were utilized as research samples. These teeth were then prepared to form a class 1 cavity, then divided into two groups, namely; (1) One-Bulkfill (3M ESPE) and (2) Z350 XT (3M ESPE). These two samples were immersed in 1% Methylene Blue solution and observed using a Camera with a Macro Lens. Data were analyzed using an independent sample t-test. The results demonstrated a significant difference in microleakage between the two groups (p = 0.014, p0.05). The mean value of microleakage in One-Bukfill composite resin restorations was 0.022, while Z350 XT composite resin restorations had 0.038. It can be concluded that the One-Bulkfill composite resin restoration had a smaller microleakage value than the conventional composite resin restoration (Z350 XT).

APA, Harvard, Vancouver, ISO, and other styles

44

Karim, A. N. Mustafizul, Nor A. B. Khalid, Raja N. H. R. Ismail, Mahbubul Haque, and Shahida Begum. "Securing Superior Properties of Composite (PP+WF) through Central Composite Design." Advanced Materials Research 535-537 (June 2012): 186–89. http://dx.doi.org/10.4028/www.scientific.net/amr.535-537.186.

Full text

Abstract:

Due to numerous attractive properties, use of composites is in increasing trend. Efforts are being made to develop new composites securing their useful properties at optimum level for more demanding applications. The purpose of this project is to optimize the mechanical properties of composite (polypropylene + wood fiber) using Central Composite Design (CCD) technique. Accordingly experiments were conducted to develop mathematical models in terms of three process parameters - composition (percentage of PP and wood fiber), injection pressure (bar), and time (second) for functional characteristics such as tensile strength and water absorption. Design expert software was used for convenience to carry out the analysis with a view to identifying the optimum level of the processing parameters for securing the desirable properties of the composite.

APA, Harvard, Vancouver, ISO, and other styles

45

Wan Dalina, Wan Ahmad Dahalan, M. Mariatti, Radziana Ramlee, Zainal Arifin Mohd Ishak, and Abdul Rahman Mohamed. "Comparison on the Properties of Glass Fiber/MWCNT/Epoxy and Carbon Fiber/MWCNT/Epoxy Composites." Advanced Materials Research 858 (November 2013): 32–39. http://dx.doi.org/10.4028/www.scientific.net/amr.858.32.

Full text

Abstract:

A hand lay-up and vacuum bagging method was used in this study to fabricate glass fiber/epoxy laminated composites and carbon fiber/epoxy composite laminates with multi-walled carbon nanotube (MWCNT). The density, flexural properties, and burning rate of the laminated composites incorporated with different concentration of MWCNT (0.5, 1.0, and 1.5 vol%) were investigated and analyzed. Trend in the density, flexural and burning rate of glass fiber composite laminates were compared to those of carbon fiber composite laminates. Effect of MWCNT concentration on glass fiber composites properties varies from carbon fiber composite laminates. Incorporation of 0.5vol% of MWCNT has increased flexural strength by 54.4% compared to 5-ply glass fiber composite laminates. Nonetheless addition of 1vol% of MWCNT has only increased flexural strength by 34% compared to 5-ply carbon fiber laminated composites. Incorporation of MWCNT has successfully reduced the burning rate of the glass fiber composites as well as the carbon fiber laminated composites.

APA, Harvard, Vancouver, ISO, and other styles

46

Herlinasari, Nasmi, and Suteja Suteja. "Pineapple Leaf Fiber Reinforced Polyester Composite Modified with Particles from Horse Dung Waste: Characterization of Mechanical Properties and Morphology." Journal of Fibers and Polymer Composites 1, no. 1 (March 30, 2022): 20–33. http://dx.doi.org/10.55043/jfpc.v1i1.38.

Full text

Abstract:

Abstract. The modification of the characteristics of natural fiber composites with components derived from abundant and environmentally beneficial horse dung waste has piqued interest. The purpose of this investigation was to see how adding horse dung particles (DN) to pineapple leaf fiber (DN)/polyester composites affected the results. To create new samples, different percentages of HF (5–30%) are utilized. Hand-layup method was used to create the DN/HF composite. The results revealed that adding 30% (vol. percent) HF to the composite improved elongation, flexural strength, and flexural modulus, while adding 5% (vol. percent) HF improved impact strength, tensile strength, and tensile modulus of elasticity. At 30% HF concentration, maximum flexural strength values of 63.91 5.1 MPa were recorded. The composite's fracture morphology revealed weak interfacial interactions between DN-polyester-HF, and particle accumulation.

APA, Harvard, Vancouver, ISO, and other styles

47

Noor Zuhaira, Abd Aziz, and Mohamed Rahmah. "Effects of Calcium Carbonate on Melt Flow and Mechanical Properties of Rice Husk/HDPE and Kenaf/HDPE Hybrid Composites." Advanced Materials Research 795 (September 2013): 286–89. http://dx.doi.org/10.4028/www.scientific.net/amr.795.286.

Full text

Abstract:

In this research, calcium carbonate (CaCO3) was compounded with rice husk/high density polyethylene (HDPE) and kenaf/HDPE composite at different filler loadings to produce hybrid composites. Melt flow index (MFI) and mechanical properties of hybrid composite was investigated. From the test results, the addition of CaCO3 filler had decreased melt flow index (MFI) on both composites. In terms of mechanical properties, tensile strength, elongation at break and impact strength decreased, whereas Youngs Modulus increased with the increase of CaCO3 in both kenaf/HDPE and rice husk/HDPE composites. Impact strength of unfilled rice husk/HDPE composite was lower than unfilled kenaf/HDPE composite, however impact strength of CaCO3/rice husk/HDPE hybrid composite were found to have slightly higher than CaCO3/kenaf/HDPE hybrid composite with addition of 10% and 20% of CaCO3.

APA, Harvard, Vancouver, ISO, and other styles

48

Chen, Jieng-Chiang, and Xiu-Zhi Yang. "Bending and compression of glass fabric-corrugated paper–epoxy sandwich composites." Modern Physics Letters B 34, no. 07n09 (March 2, 2020): 2040003. http://dx.doi.org/10.1142/s0217984920400035.

Full text

Abstract:

The manufacturing procedures of sandwich composites containing corrugated paper (CP) as a core layer and covered with glass fabrics are discussed herein. The core layer of the sandwich composite was fabricated with CP-reinforced epoxy (E) resin and then stacked with glass fabric on the top and bottom surfaces to fabricate the sandwich composites. Three composites [a CP-reinforced E (CP/E) composite, glass fiber nonwoven mat (GN) sandwich composite with a CP core layer (GN/E/CP) and glass mesh fabric (GM) sandwich composite with a CP core layer (GM/E/CP)] were developed in this study. The bending and compression properties of these sandwich composites were measured on a materials test system. Experimental results revealed that the bending strength of the GN/E/CP sandwich composite was approximately 45% and 150% higher than those of the GM/E/CP and CP/E sandwich composites, respectively.

APA, Harvard, Vancouver, ISO, and other styles

49

Potapova, Ekaterina, Ekaterina Dmitrieva, Aung Kyaw Nian, and Elena Tsvetkova. "Gypsum Composite Reinforced with Polymer Fibers." Key Engineering Materials 910 (February 15, 2022): 880–86. http://dx.doi.org/10.4028/p-dgyem5.

Full text

Abstract:

Composite gypsum binders harden quickly, gain strength quickly and have positive environmental properties. Moreover, they are characterized by increased moisture resistance, which significantly expands the field of application of such gypsum materials. Dispersed reinforcement of composite gypsum binders with polypropylene fibers makes it possible to obtain composites characterized by high performance properties. On basis of developed compositions of gypsum-cement-pozzolanic and composite gypsum binders with polymer fibers, gypsum composites have been created, characterized by increased strength, water resistance, frost and corrosion resistance.

APA, Harvard, Vancouver, ISO, and other styles

50

Zhang, Chun Hua, Jin Bao Zhang, Mu Chao Qu, and Jian Nan Zhang. "Toughness Properties of Basalt/Carbon Fiber Hybrid Composites." Advanced Materials Research 150-151 (October 2010): 732–35. http://dx.doi.org/10.4028/www.scientific.net/amr.150-151.732.

Full text

Abstract:

Basalt fiber and carbon fiber hybrid with alternate stacking sequences reinforced epoxy composites have been developed to improve the toughness properties of conventional carbon fiber reinforced composite materials. For comparison, plain carbon fiber laminate composite and plain basalt fiber laminate composite have also been fabricated. The toughness properties of each laminate have been studied by an open hole compression test. The experimental results confirm that hybrid composites containing basalt fibers display 46% higher open hole compression strength than that of plain carbon fiber composites. It is indicated that the hybrid composite laminates are less sensitive to open hole compared with plain carbon fiber composite laminate and high toughness properties can be prepared by fibers' hybrid.

APA, Harvard, Vancouver, ISO, and other styles

Journal articles on the topic 'Al composite'

Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles