scholarly journals IZOD IMPACT CHARACTERISTICS OF POLYPROPYLENE FIBER (PPF)/POLYESTER COMPOSITE LAMINATE WITH STATISTICAL ANALYSIS

2012 ◽  
Vol 15 (1) ◽  
pp. 200-210
Author(s):  
A Selmy ◽  
M AbdelBaky ◽  
A Anani
Keyword(s):  
Statistical Analysis ◽  
Composite Laminate ◽  
Polypropylene Fiber ◽  
Polyester Composite ◽  
Izod Impact ◽  
Impact Characteristics

scholarly journals Influence of Fiber Orientation on Impact Resistance Behavior of Woven Sisal Fiber Reinforced Polyester Composite

2021 ◽  
Vol 2021 ◽  
pp. 1-11
Author(s):  
Genetu A. Dress ◽  
M. H. Woldemariam ◽  
D. T. Redda
Keyword(s):  
Fiber Orientation ◽  
Test Specimen ◽  
Impact Resistance ◽  
Impact Testing ◽  
Sisal Fiber ◽  
Fiber Reinforced ◽  
Average Impact ◽  
Polyester Composite ◽  
Izod Impact

Woven natural fiber reinforced polymer composites have better tensile, flexural, and compressive strength compared to the mechanical properties of unidirectional and randomly oriented NFRPC because of the interlacing of fiber bundles. However, the characterization of impact behavior with different fiber orientation such as 30°/60°, 0/90°, 30°/−45°, and 45°/−45° woven sisal fiber reinforced polyester composite was not studied vigorously. Thus, this paper focuses on the experimental characterization of the impact resistance behavior on woven sisal fiber reinforced polyester composite materials for semistructural part by using Izod impact testing setup. The 30°/60°, 30°/−45°, 0°/90°, and 45°/−45° woven sisal fiber was prepared using nailed wooden frame as a warp and weft guider. The woven sisal fiber was impregnated in order to make woven sisal fiber dimensionally stable. Using 40% by weight of fiber and 60% by weight of polyester, the composite was developed using hand layup process. The morphology and cross-sectional elemental detection was carried out using scanning electron microscope (SEM) assessment in leather development institute (LDI). Finally, impact tests were carried out using Izod impact testing setup in Addis Ababa Science and Technology University (ASTU). The average impact strength of a 40 wt% fiber 45°/−45° woven sisal fiber reinforced unsaturated polyester composite (WSFRPC) test specimen with consecutive warp and weft tow spacing of 2 mm was 342.67 J/m and this was greater energy compared to the other orientations. But the average impact strength of a 40 wt% fiber 30°/60° WSFRPC of test specimen with consecutive warp and weft tow spacing of 2 mm was 241.33 J/m.

Fracture Behavior of Glass-Cloth/Polyester Composite Laminate at Low Temperature

1985 ◽  
Vol 4 (2) ◽  
pp. 205-211 ◽  
Author(s):  
Defu Xu ◽  
Rongjin Liu ◽  
Jiansheng Xia ◽  
Jianhua Zhao ◽  
Wei Shen
Keyword(s):  
Low Temperature ◽  
Composite Laminate ◽  
Fracture Behavior ◽  
Glass Cloth ◽  
Polyester Composite

scholarly journals ANALYSIS OF THE EFFECT OF QUANTITY OF CATALYST AND LAMINATE THICKNESS ON CURING TIME IN PRODUCTION OF GLASS REINFORCED POLYESTER COMPOSITE

2020 ◽  
Vol 5 (7) ◽  
pp. 1-6
Author(s):  
R Chemeli ◽  
C.M. Ondieki
Keyword(s):  
Statistical Analysis ◽  
Polyester Resin ◽  
Unsaturated Polyester ◽  
Curing Time ◽  
Plastic Composite ◽  
Polyester Composite ◽  
Glass Fiber Reinforcement ◽  
Exothermic Chemical Reaction ◽  
Polyester Composites ◽  
Laminate Thickness

Production process of reinforced plastic composite materials involves the curing of a thermosetting resin through an exothermic chemical reaction. Research studies have shown that the exothermic heat released during curing process and whose degree varies with laminate thickness has an effect on curing time. The curing time for the resin dictates the rate of production and quality of product. This study aimed at investigating the effect of laminate thickness and quantity of catalyst on the curing time during the production of glass reinforced polyester composite. This research utilized unsaturated polyester resin, Methyl Ethyl Ketone Peroxide catalyst and E-glass fiber reinforcement for sample preparation. Different amount of catalyst ranging from 0.5% to 5% were dispensed on the polyester resin used in making laminate samples of thicknesses ranging from 1mm to 3mm and hand lay-up technique was used to produce sample panels. Curing time of the samples was determined according to the ASTM standards while data analysis was done using the statistical analysis software. Results showed that curing time reduced with increase in both laminate thickness and quantity of catalyst which could be attributed to heat evolved during polymer cross linking heat that was more pronounced in thicker laminate and higher catalyst levels. Statistical analysis showed that the catalyst level had a significant effect on curing of glass reinforced polyester composites compared with laminate thickness or an interaction between the two. It was concluded that the curing time of glass- reinforced polyester composites depended on the laminate thickness and quantity of catalyst.

scholarly journals Linear Buckling Behaviour of Composite Laminate [(Θ/-Θ)] with Various Shaped Cutout using Fem

2019 ◽  
Vol 9 (1S4) ◽  
pp. 18-22
Keyword(s):  
Uniaxial Compression ◽  
Composite Laminates ◽  
Composite Laminate ◽  
Buckling Load ◽  
Laminated Plate ◽  
Vertical Rectangle ◽  
Buckling Behavior ◽  
Linear Buckling ◽  
Polyester Composite ◽  
Layer Orientation

In this paper, the buckling behavior has been investigated on square laminate made of Woven-glass-polyester composite with various shaped cutouts (i.e., circle, square, vertical rectangle, horizontal rectangle, vertical ellipse, horizontal ellipse) numerically. The composite laminates have been arranged in asymmetrical order as [(θ/-θ)]. The laminated plate that is subjected to uniaxial compression has been emphasized on the laminate along with the effect of layer orientation, effect of cutout ratio and effect of cutout angle. The result shows that the minimum buckling load is obtained at 45° and the maximum buckling load attained at 0° and 90°for all laminates by increasing the layer orientation. For cutout ratio, the maximum and minimum load is obtained for the smallest and largest cutout ratio in all cutout shapes. Increasing the cutout angle, the square cutout exhibits the minimum load at 60°. In elliptical cutouts, the load is decreasing and increasing gradually while they are aligned in along and perpendicular to the loading directions. The rectangular cutouts positioned vertically and horizontally the load is decreasing up to 30° and 60°and then increasing up to 90°.

scholarly journals Impact and Tensile Properties of Polyester Nanocomposites Reinforced with Conifer Fiber Cellulose Nanocrystal: A Previous Study Extension

Polymers ◽  
2021 ◽  
Vol 13 (11) ◽  
pp. 1878
Author(s):  
Grazielle da Silva Maradini ◽  
Michel Picanço Oliveira ◽  
Lilian Gasparelli Carreira ◽  
Damaris Guimarães ◽  
Demetrius Profeti ◽  
...  
Keyword(s):  
Water Absorption ◽  
Engineering Application ◽  
Crystallinity Index ◽  
Tensile Tests ◽  
Fiber Composites ◽  
Chemical Effect ◽  
Glass Fiber Composites ◽  
Tensile Performance ◽  
Polyester Composite ◽  
Izod Impact

In a recent paper, novel polyester nanocomposites reinforced with up to 3 wt% of cellulose nanocrystals (CNCs) extracted from conifer fiber were characterized for their crystallinity index, water absorption, and flexural and thermal resistance. The use of this novel class of nanocomposites as a possible substitute for conventional glass fiber composites (fiberglass) was then suggested, especially for the 1 and 2 wt% CNC composites due to promising bending, density, and water absorption results. However, for effective engineering applications requiring impact and tensile performance, the corresponding properties need to be evaluated. Therefore, this extension of the previous work presents additional results on Izod and tensile tests of 1 and 2 wt% CNC-reinforced polyester composites, together with a comparative cost analysis with fiberglass. The chemical effect caused by incorporation of CNCs into polyester was also investigated by FTIR. In comparison to the neat polyester, the Izod impact energy increased 50% and 16% for the 1 and 2 wt% composites, respectively. On the other hand, the tensile strength and Young’s modulus remained constant within the ANOVA statistical analysis. FTIR analysis failed to reveal any chemical modification caused by up to 2 wt% CNC incorporation. The present impact and tensile results corroborate the promising substitution of a polyester composite reinforced with very low amount of CNCs for common fiberglass in engineering application.

Statistical analysis of classification

1966 ◽  
Vol 24 ◽  
pp. 188-189
Author(s):  
T. J. Deeming
Keyword(s):  
Multivariate Analysis ◽  
Statistical Analysis ◽  
Classification Scheme ◽  
Analytical Procedure ◽  
Narrow Band ◽  
Scientific Research ◽  
Maximum Amount ◽  
Amount Of Information

If we make a set of measurements, such as narrow-band or multicolour photo-electric measurements, which are designed to improve a scheme of classification, and in particular if they are designed to extend the number of dimensions of classification, i.e. the number of classification parameters, then some important problems of analytical procedure arise. First, it is important not to reproduce the errors of the classification scheme which we are trying to improve. Second, when trying to extend the number of dimensions of classification we have little or nothing with which to test the validity of the new parameters.Problems similar to these have occurred in other areas of scientific research (notably psychology and education) and the branch of Statistics called Multivariate Analysis has been developed to deal with them. The techniques of this subject are largely unknown to astronomers, but, if carefully applied, they should at the very least ensure that the astronomer gets the maximum amount of information out of his data and does not waste his time looking for information which is not there. More optimistically, these techniques are potentially capable of indicating the number of classification parameters necessary and giving specific formulas for computing them, as well as pinpointing those particular measurements which are most crucial for determining the classification parameters.

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