Evaluation of Laminated Composites Reinforced by High-performance Kevlar Filaments with Variable SiO2: Mechanical, Morphological & Thermal Tests
Md. Sahab Uddin,
Md. Shariful Islam,
Farjana Showline Chaity,
Md. Ali Akbar,
Shahin Akand,
M. A. Gafur,
A. M. Sarwaruddin Chowdhury
Issue:
Volume 4, Issue 2, December 2020
Pages:
15-24
Received:
12 August 2020
Accepted:
24 August 2020
Published:
16 September 2020
DOI:
10.11648/j.cm.20200402.11
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Abstract: In contemporary years, a necessity to produce satisfactory and progressive modules for engineering roles have been expanded rapidly. Laminated fiber-strengthened composite substances have well-made candidature for satisfying those factors with huge applications in nearly all regions of engineering and technology. Glass, Carbon, and aramid fibers are using extensively for the manufacturing of fiber-bolstered polymer composites. Kevlar is the highly accepted aramid fiber having an extended chain of strong, ring-like aromatic molecules. Superior temperature and shock-resistant aspects make kevlar the maximum promising antiballistic fabric with balance at elevated temperatures. It is extensively used for human body armor panels for light-weight army vehicles, bulletproof jackets, and fireproof bodysuits, and in aerospace industries, etc. In this work, we tested the tensile, flexural, and impacts strength of kevlar 49 (K-49) fiber-reinforced polymer complex. We additionally characterized its DTG/TG test, FTIR test, and SEM analysis for a definite and reliable notion of it. The composite samples used on this work had been organized with the aid of using hand lay-up procedure. All Mechanical characterizations had been carried out according to the necessities of ASTM standards. In this study, highest tensile strength and elastic modulus was observed for 5*% milled silica and lowest for composite with 0% silica. Composite C4 of 2% silica shows the maximum hardness in both Leeb rebound and Vickers micro hardness method (320.1HV, 447.8HRC). DTG curves of composites show that at 378.8°C, and 355.5°C the rate of degradation of the composite was 559 µg/min, and 58.5µg/min for composite C1, and C7 respectively. However, the findings were supported by FTIR and SEM images analysis.
Abstract: In contemporary years, a necessity to produce satisfactory and progressive modules for engineering roles have been expanded rapidly. Laminated fiber-strengthened composite substances have well-made candidature for satisfying those factors with huge applications in nearly all regions of engineering and technology. Glass, Carbon, and aramid fibers ar...
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Buried Fiber Concrete Sewer Pipes: Studies, Design and Testing
Tural Rustamli,
Nijat Mastanzade
Issue:
Volume 4, Issue 2, December 2020
Pages:
25-29
Received:
23 September 2020
Accepted:
9 October 2020
Published:
17 October 2020
DOI:
10.11648/j.cm.20200402.12
Downloads:
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Abstract: The article discusses the stress-strain state of fiber concrete sewer pipes manufactured by the method of dry vibrocompression. The use of large-diameter underground pipes has increased the number of accidents from soil settlement and seismic impact. The main purpose of this work is to study the effect of the transverse component of the seismic load on underground fiber-reinforced concrete pipes. The change in the stress-strain state was carried out using the Plaxis 2D, Plaxis 3D and SAP2000 programs and was confirmed in experimental tests. At the test site of the Research Institute of Building Materials laboratory tests of fiber-reinforced concrete samples for compression, bending, crack resistance, tension and splitting were carried out. The main objective of researches is determination of the optimum quantity of a fiber in a pipe and the necessary design mechanical characteristics of a fiber concrete. The elasticity modulus, Poisson's ratio and the tension loadings were defined. When testing steel fibers of 3D and polypropylene fibers were used. The test results of fiber concrete pipes with various content of steel fiber (20, 30 and 40 kg/m3) showed that 30 kg of fiber per one cubic meter of concrete can be considered optimal for the structure.
Abstract: The article discusses the stress-strain state of fiber concrete sewer pipes manufactured by the method of dry vibrocompression. The use of large-diameter underground pipes has increased the number of accidents from soil settlement and seismic impact. The main purpose of this work is to study the effect of the transverse component of the seismic loa...
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