Print ISSN: 1681-6900

Online ISSN: 2412-0758

Keywords : Epoxy resin


Erosion Wear Behavior of Natural and Industrial Material for Polymer Matrix Composite by Using Taguchi Analysis

Marwa S. Atallah

Engineering and Technology Journal, 2020, Volume 38, Issue 7, Pages 1016-1025
DOI: 10.30684/etj.v38i7A.558

The behavior of the erosion wear for samples manufactured by hand layup method of epoxy-supported fiberglass, eggshells and calcium carbonate particles were investigated. The test was performed in accordance with the experimental designs Taguchi (L 9) MINITAB (19) to select samples that have the resistance to erosion under the influence of factors. The erosion rate was assessed under the influence of three factors: weight fraction (2% to 8% eggshells and CaCO3 particles), sand size (450, 650, 850 μm) and angles (30º, 60º, 90º) with a fixed face distance of 30 cm, 10 hours and a flow rate of 45 L/min. The results revealed that the rate of erosion is lower for samples consisting of enhanced epoxy resins (eggshell molecules and CaCO3) with chopped fiber glass compared to unfilled samples. Also from these results, it should be noted that the maximum erosion rate was when the weight fraction (2%), the sand size of 850 μm and the angle of 90º, while the minimum rate of erosion was when weight fraction (8%), sand size 650 μm and 30º angle. In this work, the sample of composite materials behaves in a semi- ductile manner.

The Rheological Properties of Isothermal Curing of DGEBA/ TETA Epoxy System

Adnan A. Abdul Razak; Najat j. Saleh; Maryem Emad

Engineering and Technology Journal, 2015, Volume 33, Issue 5, Pages 1095-1112

In this study viscosity (η) of diglycidyl ether of bisphenol A / triethylenetetramine (DGEBA/TETA) system were measured through curing using a Brookfield viscometer at four different temperatures (30, 45, 60 and 80) °C. The measurements were carried out for two hardener/resin ratios (13 and 20) phr. The gel time was calculated for each hardener/resin ratio formulation; from the viscosity experimental data. The results showed that the gel time decrease with increasing curing temperature for each hardener/resin ratio formulation. Viscosity profiles were described by a model based on the Boltzmann function. The fitted results agreed well with the experimental values.

Mechanical Properties of Composite Material Using Natural Rubber with Epoxy Resin

Hani Aziz Ameen

Engineering and Technology Journal, 2008, Volume 26, Issue 2, Pages 254-264

In this paper the mechanical properties of three types of composite materials using
natural rubber vulcanized, unvulcanized and reinforced rubber have been
investigated . The composite material using natural rubber and epoxy resin is
manufactured by three methods, first method is mixing the natural rubber with
epoxy resin by special mixer without any additional materials, the second method
is to make a layer of rubber then coating it with a layer of epoxy resin and bonding
using the rolling process. The third one is use in the natural rubber as a matrix
material and using additional materials like carbon black in specific ratio and mix
with them the epoxy resin in five ratios ( 20%, 40%, 60%, 80%, and 100%) .
The first and second methods failed because composite material produced was
inhomogeneous while the third method succeeded and the composite material was
homogenous. Compression and hardness tests have been done on the resulting
composite material of the third method and from the result it is found that the
composite material has good properties and these properties improved by
increasing the ratio of epoxy resin to the natural rubber. Then the mechanical
properties of three types of composite material using natural rubber vulcanized,
unvulcanized and reinforced rubber have been investigated . Each type was coated
with six percentages of epoxy resin (0% , 20% , 40%, 60%, 80%, and 100 %) . The
values of Young’s modulus, yield stress, tensile strength and yield strain which
were calculated for each case and for all percentages of epoxy resin. It is concluded
that the properties of the new composite material using natural rubber is
muchbetter than the properties of the pure natural rubber and the increasing in the
percentage of epoxy resin in vulcanized rubber leads to a decrease in Young’s
modulus and increasing percentage of epoxy resin in unvulcanized rubber and
reinforced rubber leads to an increase in Young modulus