Print ISSN: 1681-6900

Online ISSN: 2412-0758

Keywords : Composite materials


Recycling of Wood – Plastic Composite Prepared from Poly (Ethylene Terephthalate) and Wood Sawdust

Halla M. Shehap; Mohammed A. ALzuhairi; Sarmad I. Ibrahim; Saif S. Hussien

Engineering and Technology Journal, 2021, Volume 39, Issue 11, Pages 1654-1662
DOI: 10.30684/etj.v39i11.2203

Plastic waste has become one of the humanities and the ecosystem balance serious environmental Challenges. Furthermore, it is the primary source of plastic pollution because it is inexpensive, widely available, and frequently discarded. Using various waste materials and side fractions as part of wood-plastic composites is one way to promote the circular economy (WPC). Several environmental benefits can be realized by using recycled plastic, including extending the usable life of plastic, reducing waste, contributing to the development of trash recycling, and preventing resource depletion. One of the most efficient recycling processes is glycolysis; the (PET) is depolymerized by ethylene glycol in continuous stirring reactors at temperatures between 200 and 220◦C using glycol as solvent. This work concentrates on the experimental investigation of composite materials from DE polymerization PET, Unsaturated polyester, and VV/55 as a matrix and wood sawdust as reinforcement. The composite samples were checked by the Hardness test, water test, and density test. According to the experimental results, the optimum value is at (2%) wood percentage, giving high hardness value, low density, and low water absorption.

Effect of ZrO2 Addition on Microstructure and Mechanical Properties of Al-Zn-Mg Alloy Matrix Composite

Israa A. Aziz; Russul S. Bedien

Engineering and Technology Journal, 2020, Volume 38, Issue 12, Pages 1751-1757
DOI: 10.30684/etj.v38i12A.336

Aluminum – based metal matrix composite are widely used in industrial applications compared with conventional and unreinforced alloy. The composite materials usually exhibit a higher strength both at elevated and ambient temperature, as well as wear resistance. The production of composite materials which contain different weight percentage of ZrO2 (0.5, 1.5 and 2.5wt %) by stir casting process. The mechanical properties of the base alloy and composite were evaluated by using tensile and hardness tests. The microstructure inspection by optical microscopy, scanning electron microscope and energy dispersive spectroscopy (EDS) were utilized to study the fracture surface topography. The results represent that the hardness, strength of yield and tensile strength increased with increasing the weight % of ZrO2 to 2.5 % while the elongation decreased. The microstructure inspection by optical microscope shows that the dendrites structure and the particles distribution in matrix without any voids. Furthermore, the grain size refining with the weight percentage of weight reinforcement elevated.

Effect of Laser Shock Peening on Fatigue Stress Concentration of Polyester Reinforced by Al-Micro Powder Composites

Ahmed N. Al- Khazraji; Ammar A. Mutasher

Engineering and Technology Journal, 2020, Volume 38, Issue 3A, Pages 325-334
DOI: 10.30684/etj.v38i3A.345

Laser shock peening is a widely common process for materials treatment and typically used for fatigue strength enhancement especially for metals. In this paper, its effect on polymeric composite materials studied experimentally. Unsaturated polyester was used as a matrix in order to composites preparation and Aluminum powder as fillers. A Hand lay-up technique has been used for composites making. Composites with three volume fractions of Aluminum powder were prepared (2.5%, 5%, and 7.5%). Fatigue specimens as a standard and with (1mm) semi-circular notch are prepared for testing. The fatigue test was performed at room temperature and stress ratio (R=-1). Laser shock peening with two levels of energy have been applied (1Joule, and 2Joule). The results showed an increase in the endurance strength of the notch for 7.5% volume fraction especially at 1J laser energy by about 26.7056% compared with the un-treatment notched state, which in turn reduced the fatigue stress concentration by about 21.0508% compared with standard fatigue stress concentration. On the other hand, the presence of notch effect on endurance strength was increased after laser treatment of composites with 2.5% volume fraction and the reduced was by about 39.698% at 2J laser energy.

Recycling of Sewage Sludge Ash in Polymer Structures

Mohamad Alsaadi; Aseel B. Al-Zubaidi; Mukhallad Haider; Hasanain Hashim

Engineering and Technology Journal, 2019, Volume 37, Issue 3C, Pages 311-318
DOI: 10.30684/etj.37.3C.2

In this study sewage sludge ash (SSA) particles were used as filler in the polyester resin to fabricate particulate composites with various filler contents of 0, 1, 2, 3, 4, 5, 6 and 7 wt%. The tensile, flexural, impact, hardness, chemical composition and scanning electron microscope tests wear done on the samples in accordance with ASTM standards. The results were improved at the particle content of 5 wt% for the tensile and flexural strength and then showed reducing trend with extra particle addition. Tensile and flexural modulus values of the particulate polyester composites significantly enhanced compared with the unfilled polyester composite. Energy Dispersion Spectrometry (EDS) results showed that the SSA contains elements and oxides which may increase adhesion force with polymer. In spite of the particle content of SSA that used with polymer to produce various structures for different applications was low, this study approved that using of SSA can protect the environment due to increasing the amount of SSA can affect the environment badly in addition to produce cheaper polymer composite for industrial applications.

Mechanical and Acoustic Properties of Composite Material in a Secondary Roof to Reducing the Cooling Load

Nassr F. Hussein; Aseel J. Mohammed; Hatam K. Kadhom

Engineering and Technology Journal, 2018, Volume 36, Issue 9A, Pages 972-978
DOI: 10.30684/etj.36.9A.5

The present investigation aims to perform experimental study to show the feasibility of application composite materials as secondary roofs, as well as their capability for reducing cooling load in building. Moreover, compare some of their mechanical properties and acoustic insulation with conventional secondary roofs. Three basic models, which are common, were chosen for the construction of buildings' roofs in Baghdad (concrete and concrete tiles as basic components of the first model, brick and clay tiles as basic components of the second model and brick and normal tiles as basic components of the third model). In addition, three composite materials were used in present work (fiber glass+ Nylon 66, fiber glass+ one layer of date palm cortex and fiber glass+ two layers of date palm cortex). The gypsum plates have been selected as a conventional secondary roofs when performing calculations and comparison. The results show that using proposed composite materials leads to significant reduction in cooling load by about 69.56 %, 65.3 % and 65.5 % respectively for the three models. In addition, the comparison of acoustic insulation shows that the proposed materials offer good acoustic insulation. Moreover, these materials able to afford external shocks better.

Effect of Particle Size on Mechanical Properties of the Recycling Compact Disks Reinforced Epoxy

Shayma J. Ahmed

Engineering and Technology Journal, 2018, Volume 36, Issue 6A, Pages 641-645
DOI: 10.30684/etj.36.6A.7

The recycling of CDs or DVDs (compact disks) as a filler in polymer composites can be used in many engineering applications such as electrical, automobile, and building applications. In the present paper, composite materials were prepared of epoxy resin reinforced with three different particles size (600˂d˂850, 200˂d˂600, d˂200 μm) of recycling of CDs or DVDs (a very thin aluminum layer is used to record information). Hand lay-up technique was conducted to produce composite material samples. Different types of tests, such as tensile, bending, impact, and hardness were applied on these samples. The mechanical characteristics of the composite samples were analyzed. The finding observed that smaller chopped of CDs or DVDs reinforced epoxy had better tensile, bending, hardness, and impact properties.

Study the Characteristics Thermal and Mechanical for Unsaturated Polyester Resin Forced by Asbestos Fiber

Zainab H. Mohsein

Engineering and Technology Journal, 2018, Volume 36, Issue 3A, Pages 282-286
DOI: 10.30684/etj.36.3A.6

In this work prepared and study a polymer composite, where use polyester resin with asbestos fiber ratio (5%, 10% and 15%). First study effect of changing reinforcement percentage by asbestos fiber on coefficient thermal conductivity (k) of polymer composite. Result show decrease in the coefficient thermal conductivity (k) of composite materials with increase of weight percentage of asbestos fiber. Second, study effect of it above reinforcement ratio on the some of mechanical properties (Impact, tensile, fracture and hardness) for polymer composite. The result indicate increase value of mechanical properties with increase weight percentage of asbestos fiber. The impact strength was (2.7 kj/m2) for pure resin where reach to maximum value (7.83 kj/m2) at 15wt% of fiber .Hardness and tensile reach to maximum value at 15% weight percentage for asbestos fiber. The result illustrate improvement mechanical properties after reinforcing by asbestos fiber and these properties rises with increased in reinforcement percentage.

Studying Mechanical Properties For Polymer Matrix Composite Material Reinforced By Fibers And Particles

Engineering and Technology Journal, 2010, Volume 28, Issue 4, Pages 81-93

The work focuses on the preparation of hybrid polymer matrix composite
materials prepared from the unsaturated polyester resin as matrix reinforced by woven
glass fiber kind ( E-glass ) and graphite particles as first group of samples and the second
group of samples reinforced with woven Kevlar fiber kind (49) instead of glass fiber.
This work includes studying the effect of selected volume fractions ( 0% , 5% , 10% ,
15% , 20% ) of graphite particles with mixture of different particle Size of ( 25 μm – 106
μm ) on the properties of the prepared composite materials, Number of mechanical tests
were done,they include (Tensile, Compression, Impact, Flexural Strength, Shear Stress
and Hardness), which done at room temperature Result of the work shows that the
values of (Tensile stress, Tensile elastic modulus, Fracture Toughness, Hardness)
increase with the increase of graphite particle volume fraction for both groups samples.
As well as the values of the (Compression elastic modulus, Flexural strength, Shear
stress) increase with the increase of low values of graphite particles volume fraction for
both groups of samples. Where as the values of Impact strength of the prepared
composite material decreased with the increases of volume fraction of graphite particles
for both group samples. As well the result shows that the values (Tensile stress, Tensile
elastic modulus, impact strength, Fracture toughness) for hybrid composite materials
reinforced by Kevlar fiber are higher than values reinforced by glass fiber instead of
Kevlar fiber, While the values of (Compression stress, Flexural Strength, Shear stress,
Hardness) for hybrid composite materials reinforced by glass fiber are higher than values
reinforced by Kevlar fiber instead of glass fiber.

Effect of Dual Reinforcement on Wear Resistance by Aluminum Compacts Reinforce by SiC, Al2O3

Mohammed Moanes Ezzaldean Ali; Hanan A. R. Akkar; A. K. M. AL-Shaikhli; Ali K. Shayyish; Muhsin J. Jweeg; Wisam Auday Hussain; Mohammed T. Hussein; Mohammad A. Al-Neami; Farah S. Al-Jabary; Jafar M. Hassan; Ali H. Tarrad; Mohammed N. Abdullah; Ahmed T. Mahdi; Eyad K. Sayhood; Husain M. Husain; Nidaa F. Hassan; Rehab F. Hassan; Akbas E. Ali; Assim H Yousif; Kassim K Abbas; Aqeel M Jary; Shakir A. Salih; Ali T. Jasim; Ammar A. Ali; Hosham Salim; JafarM. Daif; Ali H. Al Aboodi; Ammar S. Dawood; Sarmad A. Abbas; Salah Mahdi Saleh; Roshen T. Ahmed; Aseel B. Al-Zubaidi; Mohammed Y. Hassan; Majid A. Oleiwi; Shaimaa Mahmood Mahdy; Husain M. Husain; Mohammed J. Hamood; Shaima; a Tariq Sakin

Engineering and Technology Journal, 2009, Volume 27, Issue 13, Pages 423-429

The producing composite materials of dual reinforcement in which the matrix material is aluminum reinforced with two types of ceramic particles : which are Alumina (50μm

Keywords

composite materials; wear test ; Al2O3; SiC: Al