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Article
Preparation of Lead Free Piezoelectric Composite Based on Polyester Resin and (LKNN6-0.5%CeO2) Ceramic Particles

Authors: Fadhil A. Chyad --- Saad B.H. Farid --- Hamza M. Kamal
Journal: Engineering and Technology Journal مجلة الهندسة والتكنولوجيا ISSN: 16816900 24120758 Year: 2016 Volume: 34 Issue: 13 Part (A) Engineering Pages: 2464-2471
Publisher: University of Technology الجامعة التكنولوجية

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Abstract

For the sake of guarding the environment from the vital problems that results from the toxic effects of lead components, lead free (LKNN6-0.5%CeO2/polyester) piezoelectric composite are prepared in this work using cold press technique. Firstly, the lead free (LKNN6-0.5%CeO2) piezoceramics are prepared using normal sintering technique. The dielectric and piezoelectric properties of the composites were examined as a function of the volume fraction of ceramic particles, all composites showed well dispersion of the piezoceramic particles in the polyester matrix as shown in SEM images. The piezoelectric and dielectric coefficients were found to be improved as the concentration of ceramic particles increases. Although the procedure is simple, the composite prepared in this study exhibited better piezoelectric and dielectric constants with (d33=41 and Ԑr=157) at (80%) volume fraction.


Article
Investigate the Effect of Different Kinds of Discontinuous Fibers on the Mechanical Properties of Epoxy Matrix Composite Materials

Authors: Ahmed M. Al-Mukhtar --- Hamza M. Kamal --- Ibrahim A. Atiyah --- Ahmed K. Muhammad
Journal: Engineering and Technology Journal مجلة الهندسة والتكنولوجيا ISSN: 16816900 24120758 Year: 2018 Volume: 36 Issue: 5 Part (A) Engineering Pages: 520-522
Publisher: University of Technology الجامعة التكنولوجية

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Abstract

composite manufacturing has been a wide variety of applications. The low density, stiffness, and weight to strength ratio giving these materials significant mechanical properties in aerospace, and automotive industries. In this work, the specimens of fiber reinforced composites have been prepared by adding different percentage of two types of fibers in epoxy resins matrix. So, the aim of this study is to evaluate the effect of additives on the mechanical properties according to Standard Test Method for Tensile Properties ASTM D3039. The tensile and hardness testing show that the carbon fibers improve the hardness and tensile strength due to their higher mechanical properties. In addition, they have high strength to weight ratio as compare with polypropylene fibers.


Article
The Influence of Alkaline Treatment of Recycled Natural Materials on the Properties of Epoxy Resin Composites
تأثير المعاملة القاعدية للمواد الطبيعية المعادة على خواص متراكبات راتنجات الايبوكسي

Authors: Raeid K. Mohammed رائد كاظم محمد --- Mohammed J. Kadhim محمد جواد كاظم --- Hamza M. Kamal حمزة مصطفى كمال
Journal: Al-Khwarizmi Engineering Journal مجلة الخوارزمي الهندسية ISSN: 18181171 23120789 Year: 2018 Volume: 14 Issue: 4 Pages: 45-53
Publisher: Baghdad University جامعة بغداد

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Abstract

Natural fibers and particles reinforced composites are being broadly used due to their bio and specific properties such as low density and easy to machine and production with low cost. In this work, water absorption and mechanical properties such as tensile strength, flexural strength and impact strength of recycled jute fibers reinforced epoxy resin were enhanced by treating these fibers with alkaline solution. The recycled jute fibers were treated with different concentration of (NaOH) solution at (25 0C) for a period of (24) hours. From the obtained results, it was found that all these properties are improved when fibers treated with (7.5wt% NaOH) related to untreated fibers. Conversely, the mentioned properties of composites decreased after fibers treated with (10wt% NaOH). In addition, the hybrid composite with recycled jute fibers and recycled walnut shell powder showed obvious enhancement in the above-mentioned properties.

المواد المتراكبة المقواة بالألياف والدقائق الطبيعية تستخدم بشكل واسع بسبب خواصها الحيوية والنوعية مثل الكثافة المنخفضة وسهولة التشغيل والإنتاج مع الكلفة المنخفضة. في هذا العمل، قابلية امتصاص الماء والخواص الميكانيكية مثل مقاومة الشد، مقاومة الانحناء ومقاومة الصدمة لراتنج الايبوكسي المقوى بألياف الجوت المعادة تتحسن عندما يتم معاملة هذه الالياف بمحلول قاعدي. حيث تم معاملة الياف الجوت المعادة بتراكيز مختلفة من محلول هيدروكسيد الصوديوم بدرجة حرارة (25) مئوية لمدة (24) ساعة. من خلال النتائج التي تم الحصول عليها وجد ان كل هذه الخواص تتحسن بصورة ملحوظة عند معاملة هذه الالياف ب (%7,5 من هيدروكسيد الصوديوم) نسبة للألياف غير المعاملة. على العكس من ذلك، وجد ان الخواص المذكورة تتناقص عندما يتم معاملة الالياف بـ (10% من هيدروكسيد الصوديوم)، فضلا عن ذلك ان المواد المتراكبة الهجينة المقواة بألياف الجوت المعادة ومسحوق قشور الجوز المعادة اظهرت تحسناً واضحاً في الخواص المذكورة أعلاه.

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