Comparison Of Deflection Measurement Of Carbon And Kevlar Composites
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Composite integrated material of al layers with kevlar material and the speci...
This document summarizes the development of a new composite material made of Kevlar layers impregnated with a shear thickening fluid. The goal is to improve Kevlar's performance as body armor. Kevlar alone deforms too much at impact points, causing pain. The new composite aims to distribute impacts more uniformly by using a fluid that thickens during high-strain impacts. Experimental targets were made by impregnating Kevlar fabric with ethylene glycol or a silica-based shear thickening fluid. Ballistic testing showed the composite absorbed more energy than plain Kevlar. The composite provides flexibility like Kevlar but enhances ballistic protection through the shear thickening fluid.
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Effect of carbon nanotube on thermal behavior of epoxy resin composites
Abstract: Human society’s need to build low-weight, high-strength and durable structures has
increased the demand for composite materials. In this case, composites are used where high mechanical strength, low weight, sound and thermal insulation properties are required. One of the most
important issues now is designing materials and coatings aimed at reducing heat loss and resisting
high temperatures. One way to address this problem is to develop a technique for preparing and
applying composite materials that slow down their heating applied to a surface. In this study, carbon
nanotubes (CNTs) reinforced composites were fabricated using silicone molding to be applied to
honeycomb sandwich structures. To determine the effect of CNTs on the thermal behavior of the
sandwich panels, different weight percentages of this material (0.025, 0.05. 0.075 wt.%) were added to
the epoxy resin. The results showed that the thermal stability of the epoxy composites was directly
related to the increase in the percentage of CNTs as the CNT content increased to 0.075 wt.%, and the
thermal degradation temperature of the epoxy composites increased by 14 ◦C. In addition, the energy
absorption increased by 4.6% with an increase in CNTs up to 0.075 wt.%. Density measurements
showed that the density of the nanocomposite samples increased by adding CNTs to pure epoxy
resin. The actual densities of the samples reinforced with 0.025, 0.05, and 0.075 wt.% CNTs are 0.925,
0.926, and 0.927 of the theoretical density, respectively. Since the CNT dispersion uniformity in the
epoxy matrix can significantly affect the properties of the composites, in this study, a new method of
dispersing CNTs in the epoxy resin matrix resulted in higher thermal conductivity while using lower
amounts of CNTs compared to other studies. The storage modulus of the epoxy matrix composites
reinforced with 0.05 wt.% in this study was 25.9% and 6.9% higher than that from the previous study
reinforced with 0.1 wt.% and 0.25 wt.% CNTs, respectively. Furthermore, the tanδ and loss modulus
of the composite reinforced with 0.05 wt.% CNTs in this study were 52% and 54.5% higher than that
from the previous study with 0.1 wt.% CNTs, respectively. This study provided an optimal approach
for designers and engineers who want to effectively design their composite honeycomb sandwich
structure with better thermal properties.
Keywords: epoxy composites; carbon nanotubes (CNTs); thermal stability; energy absorption;
density; honeycomb sandwich structure; CNT dispersion
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