Print ISSN: 1681-6900

Online ISSN: 2412-0758

Keywords : Impact test

The Influence of Immersion in Different Chemical Solutions on the Mechanical and Physical properties of (Epoxy/Styrene-Butadiene Rubber) Blend Reinforced with Nano Copper Oxide

Rana M. Salih

Engineering and Technology Journal, 2018, Volume 36, Issue 2B, Pages 104-109
DOI: 10.30684/etj.36.2B.2

The aim of this work was to evaluate some mechanical and physical
properties of a composite material which consists of (epoxy/styrene-butadiene
rubber) blend as a matrix, reinforced with copper oxide (CuO) with a weight
fraction 3%, and the composite material was manufactured by hand lay-up.
The optimum mixing ratio was (75:25) % of epoxy and (SBR) was chosen to
accomplish the work due to its highest impact strength (2.1KJ/m2). The tests
that were performed on the material were: tensile test, impact test, thermal
conductivity test, and the absorption test, in addition to the microscopic
imaging using scanning electron microscope (SEM), to determine the surface
morphology of the specimens. Sodium hydroxide (NaOH) and hydrochloric
acid (HCl), both (0.1) normal concentration solutions, were used for the
immersion. The results showed that CuO nanofiller improved tensile and
impact properties of the blend, besides increasing resistance to diffusion of
chemicals into the material. The results showed that the immersion in HCl
solution increased the impact strength of the composite from (2.27KJ/m2) to
(3.38KJ/m2), and also increased the tensile strength from (9.2MPa) to (9.8
MPa), while immersion in NaOH solution decreased the tensile strength to
(7.3MPa), but increased the impact strength to (2.42KJ/m2). Thermal
conductivity was (0.21W/m.°C) before immersion in solutions, but changed to
(0.27W/m.°C) and (0.24W/m.°C) after immersion in HCl and NaOH
respectively. The weight gain after immersion in NaOH was higher than weight
gain after immersion in HCl.

Experimental Study of Mechanical Properties of Type Linear Low Density Polyethylene and Mold Design

Samir A. Amin; Ali Y. Hassan

Engineering and Technology Journal, 2018, Volume 36, Issue 5A, Pages 493-499
DOI: 10.30684/etj.36.5A.3

In general, the manufacture of plastic materials is commonly in the world due to their applications. Plastic is light weight, cheap, and able to be used in different industries, for example parts of automotive and home tools. This research represents a challenge on how to design and manufacture a changeable mold. First, a mold was designed by the Auto CAD program and then manufactured in the workshop. The mold consists of three parts, the middle part has changeable cavity. The mold was cooled by worm net pipes embedded into the third part. All specimens were manufacture in this mold. The injection plastic flow is perpendicular on mold. The goals of this research are to design and manufacture a mold and to determine the mechanical properties of linear low density polyethylene. Three types of test were executed, tensile, impact and bending. The results of tensile test showed that the tensile strength value is 15 MPa, Young’s modulus is 0.18 GPa, yield stress is 12 MPa, and Elongation to break is 70.88 mm. From impact test, the impact strength is about 193.75 KJ/m2, while in bending test, the flexural strength is about 18 N/mm2 and the shear stress is 1.5 N /mm2.

Effect of Addition CuO Nanoparticle to Quenching Media on Properties of Medium Carbon Steel

J.H. Mohmmed

Engineering and Technology Journal, 2017, Volume 35, Issue 9, Pages 894-898
DOI: 10.30684/etj.35.9A.4

In current work the effect of addition CuO nanoparticles to the polyalkylene glycol (PAG) water solution quenching media on some properties of medium carbon steel was examined. Five cooling media was used to quenching the steel: water, 5 and 10 % water solution of polyalkylene glycol, and 5 and 10 % water solution of polyalkylene glycol with addition of 1% of CuO nanoparticles. In addition, in this study, the cooling curves for these media and the properties of tensile and affect for quenched and unquenched medium carbon steel were studied and evaluated. The results showed that the addition of CuO nanoparticles strongly improve the quenching media features and contribute to reduce water quenched sample defects (such as distortion and cracking), while at the same time still maintaining the desired mechanical property improvements. The experimental observations indicate that samples quenched 5% polyalkylene glycol water solution of with 1% CuO nanoparticles brought the best combination of mechanical properties.

Effect of Al2O3 Powder on Some Mechanical and Physical Properties for Unsaturated Polyester Resin Hybrid Composites Materials Reinforced by Carbon and Glass Fibers

Reem Alaa Mohammed

Engineering and Technology Journal, 2016, Volume 34, Issue 12, Pages 2371-2379
DOI: 10.30684/etj.34.12A.18

This research is a study of the effect of Al2O3 powder on physical and mechanical properties of the polymer hybrid composites based on unsaturated polyester resin reinforced with carbon and glass fibers. The samples were made by a hand lay-up method according to ASTM standard for various volume fractions of additives. The polymer composites materials reinforced with carbon and glass fibers are the most used in manufacture of components such as pip, part of aerospace, and leisure industries and automotive.The polyester resin matrixwas strengthened with 3% carbon and glass fibers with 1%, 3%, 5%, 7% Al2O3 powders. The water absorption, hardness (shore D), impact test, and flexural strength properties are studied. The results show the specimens (UP+3%C.F+7%Al2O3) and(UP+3%G.F+7%Al2O3) had the maximum hardness (shore D) and water absorptionwhen compared withunfilledpolyester resinspecimen, it can be observed that the specimens(UP+3%C.F+5%Al2O3) and (UP+3%G.F+5%Al2O3) have maximum impact strength and flexural strengthcompared with specimens (UP+3%C.F+7%Al2O3)and (UP+3%G.F+7%Al2O3) .

Study the Effect of Surface and Internal Heat Treatment on Mechanical Properties of C40 Steel Alloy

lamyaa kalel; Ahlam Abd Alamer Al khafaji; Sabah N. Mahmood

Engineering and Technology Journal, 2014, Volume 32, Issue 4, Pages 922-931
DOI: 10.30684/etj.32.4A.9

The research aims to study the effect of quenching, tempering and laser surface treatment on the mechanical properties of C40 steel. The steel specimens were heated to a temperature of 860°C, soaked for 60 minutes and quenched in oil and then tempered at different temperatures (100,200,300,400,500,600,700) °C.
Laser hardening were carried out by using Nd: YAG laser with different pulses up to 5 pulses, the applied laser energy was 500 mJ.
The mechanical tests such as: impact test and microhardness, were carried out for the specimens before and after heat treatment. Microstructure evaluation was carried out using computerized optical microscope. The results showed an improvement in the internal and surface properties of the metal.