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Article
A study of the effect of nanomaterials on the physical properties of epoxy composites
دراسة تأثير المواد النانوية على الخصائص الفيزياوية لمتراكبات الايبوكسي

Authors: Balqees Mohammed Deyaa بلقيس محمد ضياء --- Teba Mageed Hameed طيبة مجيد حميد
Journal: Iraqi Journal of Physics المجلة العراقية للفيزياء ISSN: 20704003 Year: 2017 Volume: 15 Issue: 32 Pages: 68-76
Publisher: Baghdad University جامعة بغداد

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Abstract

This research studies the effect of addition of some nanoparticles (MgO,CuO) and grain size (30,40nm) on some physical properties (impact strength, hardness and thermal conductivity) for a matrix blend of epoxy resin with SBR rubber. Hand –Lay up method was used to prepare the samples. All samples were immersed in water for 9 weeks.The Results showed decreased in the values of impact strength and hardness but increased the coefficient of thermal conductivity.

تم في هذا البحث دراسة تأثير اضافة المواد النانوية (MgO, CuO) و بحجم حبيبي (30,40nm) على الخصائص الفيزيائية (مقاومة الصدمة, الصلادة والتوصيلية الحرارية) لخليط من رانتج الايبوكسي مع مطاط ستايريين بيوتادايين (SBR) قبل وبعد الغمر لمدة (10 اسابيع). حيث تم تحضير خليط بوليمري مكون من (EP+SBR) كمادة اساس. استخدمت طريقة القولبة اليدوية في تحضير النماذج كما تم غمر النماذج في الماء لمدة 9 اسابيع ولوحظ نقصان في قيم مقاومة الصدمة والصلادة وزيادة في قيم معامل التوصيل الحراري.


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

Author: J.H. Mohmmed
Journal: Engineering and Technology Journal مجلة الهندسة والتكنولوجيا ISSN: 16816900 24120758 Year: 2017 Volume: 35 Issue: 9 Part (A) Engineering Pages: 894-898
Publisher: University of Technology الجامعة التكنولوجية

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Abstract

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.


Article
Study the Effect of Surface and Internal Heat Treatment on Mechanical Properties of C40 Steel Alloy
دراسة تاثير المعاملات الحرارية السطحية والداخلية على الخواص الميكانيكية للفولاذ C40

Authors: lamyaa kalel --- Ahlam Abd Alamer Al khafaji --- Sabah N. Mahmood
Journal: Engineering and Technology Journal مجلة الهندسة والتكنولوجيا ISSN: 16816900 24120758 Year: 2014 Volume: 32 Issue: 4 Part (A) Engineering Pages: 922-931
Publisher: University of Technology الجامعة التكنولوجية

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Abstract

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.

يهدف البحث الى دراسة تاثير التقسية ,المراجعة والمعاملة الحرارية السطحية الليزرية على الخواص الميكانيكية للفولاذ C40. تم اجراء معامله حرارية للعينات عند درجة حرارهC°860 ولمدة 60دقيقة وبعدها تمت عملية تبريد بالزيت, بعدها تمت عملية المراجعة عند درجات حرارية مختلفة (700,600,500,400,300,200,100) درجة مئوية. تمت عملية التصليد الليزري باستخدام ليزر النديوم-ياك النبضي ولعدد مختلف من النبضات يصل الى 5 نبضات وبطاقة ليزر 500 ملي جول. الاختبارات الميكانيكية التي اجريت قبل وبعد المعاملة الحرارية هي اختبار الصدمة والصلادةالميكروية وقد تمت عملية الفحص المجهري باستخدام المجهرالضوئي. وقد اظهرت النتائج تحسن في الخواص السطحية والداخلية للمعدن.


Article
Impact Response for Two Designs of Athletic Prosthetic Feet
استجابه الصدمه لتصميمين من الاقدام الاصطناعية الرياضيه

Authors: Mohsin N. Hamzah محسن نوري حمزه --- Ammar S. Merza عمار سليم حميد --- Lamees Hussein Ali لميس حسين علي
Journal: Journal of Engineering مجلة الهندسة ISSN: 17264073 25203339 Year: 2018 Volume: 24 Issue: 3 Pages: 13-28
Publisher: Baghdad University جامعة بغداد

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Abstract

The present work evaluated the differences in mechanical properties of two athletic prosthetic feet samples when subjected to impact while running. Two feet samples designated as design A and B were manufactured using layers of different orientations of woven glass fiber reinforced with unsaturated polyester resin as bonding epoxy. The samples’ layers were fabricated with hand lay-up method. A theoretical study was carried out to calculate the mechanical properties of the composite material used in feet manufacturing, then experimental load-deflection test was applied at 0 degree position and 25 degree dorsiflexion feet position and impact test were applied for both feet designs to observe the behavior of the feet under static and impact loading and compare properties like stiffness, efficiency, rigidity, and shock absorption at different drop angles range from 25 degrees to 60 degrees which perform the foot positions while running. The load-deflection test result shows that the maximum deflection of the proposed design B was 32.2 mm at 0 and 38.45mm at 25. While it was 41mm at 0˚ and 39mm at 25˚ for design A. Impact test result shows that design B foot gives peak load of 128 .7 kg with a peak time of 0.06 sec, while design Afoot gives 125.32 kg peak load with a time of 0.069 sec.

يقيم البحث الحالي الاختلافات في الخواص الميكانيكية لعينتين من الاقدام الاصطناعية عند التعرض للصدمه أثناء العدو.حيث في هذا العمل، تم تصنيع عينتين اشير اليها ب AوB باستخدام طبقات من الألياف الزجاجية المنسوجه بأتجاهات مختلفه والتي تم ربطها مع بعضها باستخدام راتنجات البوليستر غير المشبعة باستخدام طريقه الترتيب اليدوي لطبقات الالياف.ثم أجريت دراسة نظرية لحساب الخواص الميكانيكية للمواد المركبة المستخدمة في تصنيع الأقدام، و تم تطبيق عده اختبارات تجريبيه منها اختبارالحمل-الانحراف عند وضع القدم بزاويه 0 و 25 درجة واختبار صدمه على كلا العينتين لمراقبة سلوك القدمين تحت تأثير الحمل الثابت وحمل الصدمه ومقارنه خضائص كالصلابه والكفاءه والصلاده وقابليه امتصاص الصدمة عند زوايا سقوط مختلفه تتراوح من 25 درجه الى 60 درجه والتي تمثل مواقع القدم اثناء دوره العدو.من نتائج اختبار الحمل-الانحراف تبين ان اقصى انحراف لعينه القدم B كان 32.2 ملم عند زاويه 0 و 38.45 ملم عند زاويه 25 في حين كان 41 ملم عند زاويه 0 و39 ملم عند زاويه 25 لعينه القدم A. نتائج اختبار الصدمه اظهرت ان عينه القدم B تعطي حمل ذروه يعادل128.7 كغم خلال 0.06 ثانيه في حين عينه القدم A تعطي 125.32كغم حمل ذروه خلال 0.069 ثانيه.الكلمات الرئيسه: قدم اصطناعيه رياضيه ;مواد مركبه ,اختبار صدمه .


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

Authors: Samir A. Amin --- Ali Y. Hassan
Journal: Engineering and Technology Journal مجلة الهندسة والتكنولوجيا ISSN: 16816900 24120758 Year: 2018 Volume: 36 Issue: 5 Part (A) Engineering Pages: 493-499
Publisher: University of Technology الجامعة التكنولوجية

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Abstract

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.


Article
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

Author: Rana M. Salih
Journal: Engineering and Technology Journal مجلة الهندسة والتكنولوجيا ISSN: 16816900 24120758 Year: 2018 Volume: 36 Issue: 2 Part (B) Engineering Pages: 104-109
Publisher: University of Technology الجامعة التكنولوجية

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Abstract

The aim of this work was to evaluate some mechanical and physicalproperties of a composite material which consists of (epoxy/styrene-butadienerubber) blend as a matrix, reinforced with copper oxide (CuO) with a weightfraction 3%, and the composite material was manufactured by hand lay-up.The optimum mixing ratio was (75:25) % of epoxy and (SBR) was chosen toaccomplish the work due to its highest impact strength (2.1KJ/m2). The teststhat were performed on the material were: tensile test, impact test, thermalconductivity test, and the absorption test, in addition to the microscopicimaging using scanning electron microscope (SEM), to determine the surfacemorphology of the specimens. Sodium hydroxide (NaOH) and hydrochloricacid (HCl), both (0.1) normal concentration solutions, were used for theimmersion. The results showed that CuO nanofiller improved tensile andimpact properties of the blend, besides increasing resistance to diffusion ofchemicals into the material. The results showed that the immersion in HClsolution 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 (9.8MPa), while immersion in NaOH solution decreased the tensile strength to(7.3MPa), but increased the impact strength to (2.42KJ/m2). Thermalconductivity 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 NaOHrespectively. The weight gain after immersion in NaOH was higher than weightgain after immersion in HCl.


Article
Study of Some Mechanical Properties for Aluminum Reinforced by Alumina Fibers

Authors: Shaker Jahel Eddres --- Ali Hubi Haleem --- Newal Muhammad Dawood
Journal: Journal of University of Babylon مجلة جامعة بابل ISSN: 19920652 23128135 Year: 2015 Volume: 23 Issue: 3 Pages: 607-615
Publisher: Babylon University جامعة بابل

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Abstract

The aim of this research was to study the ability of improving the impact resistance and Vickers microhardness of composite material based on aluminum metal reinforced by 5, 10, and 15wt.% of chopped alumina fibers. Stirring casting method has been used to make composite material by using vortex technique which is used to pull the chopped alumina fibers to inside the melted aluminum and distributed them homogeneously.Regarding the impact test, results shown that the impact resistance of the composite material are more than that in the aluminum metal and these values are increased with increasing of the amount add fibers and they reached maximum values at (10 wt. %). Then they are decreased at (15 wt. %) but these values remain at higher values than that in the aluminum metal. While the Vickers microhardness reached maximum values at (15 wt. %).

يهدف البحث الحالي إلى دراسة تحسين مقاومة الصدمة و صلادة فيكرز المايكروية لمادة مركبة ذات أساس من معدن الألمنيوم مقوى بألياف الألومينا المقطعة وبنسب وزنية (5%, 10%, 15%). وتم استخدام طريقة السباكة بالمزج في تصنيع المادة المتراكبة باستخدام تقنية الدوامة والتي تعمل على سحب ألياف الألومينا ألمقطعه إلى داخل منصهر معدن الألمنيوم وتوزيعها خلاله بشكل متجانس.أظهرت نتائج اختبار الصدم إن مقاومة الصدمة للمادة المركبة أعلى مما هي عليه لمعدن الألمنيوم وتزداد هذه القيم مع زيادة النسب الوزنية لألياف الألومينا والى حد (10%) ثم تسلك سلوكا مغايرا لكنها تبقى محافظة على قيم أعلى مما هي عليه لمعدن الألمنيوم . في حين تصل صلادة فيكرز المايكروية أعلى قيمها عند التقوية بألياف الألومينا المقطعة وبكسر وزني ((15%.


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

Author: Reem Alaa Mohammed
Journal: Engineering and Technology Journal مجلة الهندسة والتكنولوجيا ISSN: 16816900 24120758 Year: 2016 Volume: 34 Issue: 12 Part (A) Engineering Pages: 2371-2379
Publisher: University of Technology الجامعة التكنولوجية

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Abstract

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) .


Article
Mechanical and physical properties of carbon nanotubes with Kevlar fiber reinforced with polyester resin
الخواص الميكانيكية و الفيزيائية لانابيب الكاربون النانوية مع الياف الكفلر المقواة مع راتنج البولي استر

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Abstract

In this research study Hardness (shore D), Water absorption, Flexural, Impact Test, and Fracture Toughness of polymer nano composites.The polymer nano composites based on unsaturated polyester resin reinforced with Kevlar fibers (K.F). The samples are attended by hand lay – up method according to (Rule mixture) for various volume fractions of unsaturated polyester resin, fiber and carbon nanotube. The polyester resin was matrix strengthened with 3% volume fraction from Kevlar fiber and (0.5%, 1%, 1.5%, 2%( volume fractions of carbon nanotube. The water absorption, hardness (shore D), flexural test, impact testand toughness fracture properties were studied. Results showed that the water absorption increase with volume fraction increase of fiber with Carbon Nanotube, the sample (polyester+3%K.F+0.5% CNTs) has lower water absorption than other samples. The hardness (shore D), flexural test, impact testand toughness fracture for the sample (polyester+3%C.F+0.5% CNTs) has higher value for Nano- composites. Nano composites, Carbon nanotube, Kevlar fiber, Hardness (shore D), Water absorption, Flexural Strength, Impact Test, Toughness Fracture.

تم في هذا البحث دراسة الصلادة (شورD), امتصاصية الماء, مقاومة الكسر, اختبار الصدمة و متانة الكسر لمتراكبات نانوية ذات اساس راتنج البولي استر غير المشبع مقواة بألياف الكفلر. العينات جهزت بطريقة الصب اليدوي وفقالقاعدة الخلط لكسور حجمية مختلفة من راتنج البولي استر غير المشبع والالياف وانابيب الكاربون النانوية. راتنج البولي استر كان ارضية مقواة مع 3%كسر حجمي من الياف الكفلر و (0.5 ,1 ,1.5 , 2 ) % كسر حجمي لانابيب الكاربون النانوية. تم دراسة خواص امتصاصية الماء, صلادة (شور(D, اختبار الصدمة ومقاومة الكسر. اظهرت النتائج بان امتصاصيه الماء تزداد مع زيادة الكسر الحجمي للالياف مع انابيب الكاربون النانوية, العينه (بولي استر + 3% الياف كفلر + 0.5 % انابيب اكاربون النانوية) تمتلك اقل امتصاصية ماء من العينات الاخرى. الصلادة (شورD), فحص الكسر, فحص الصدمة ومتانة الكسر للعينه (بولي استر +3% الياف كفلر + 0.5 %انابيب الكاربون انانوية) تمتلك اعلى قيمه للمتراكبات النانوية.

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