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Article
Mechanical Behavior for Polymer Matrix Composite Reinforced By Copper Powder
السلوك الميكانيكي للمواد المركبة البوليمرية المدعمة بمسحوق النحاس

Author: Mohammed Abdulsattar Mohammed محمد عبد الستار محمد
Journal: AL-NAHRAIN JOURNAL FOR ENGINEERING SCIENCES مجلة النهرين للعلوم الهندسية ISSN: 25219154 / eISSN 25219162 Year: 2011 Volume: 14 Issue: 2 Pages: 160-176
Publisher: Al-Nahrain University جامعة النهرين

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Abstract

The mechanical properties of commercial epoxide resin type conipox 77Z have been investigated both unfilled and filled with varying weight fraction of copper particles. The values of Young’s modulus, modulus of rigidity, yield stress, tensile strength, shear strength, flexural strength, fracture energy, impact strength, coefficient of friction and the S/N curves and the fatigue strength or fatigue limit have been studied at room temperature (25°C) to a certain the influence of weight fraction of copper powder to epoxy resin (0%, 5%, 10% and 15%) and found that increasing the weight fraction of copper powder to epoxy for different particle sizes leads to an increase in modulus of elasticity (E), modulus of rigidity (G), tensile yield stress and ultimate tensile strength but at the same time will decrease the compression yield stress, fracture energy and the impact strength. Finally the reinforced epoxy with (15%) was found to be improving the mechanical properties for composite material, where the modulus of elasticity and the modulus of rigidity increased and the coefficient of friction of the composite material to steel decreased.

الخواص الميكانيكية لراتنج الايبوكسي التجاري conipox 77 قد درست في حالة التدعيم بدقائق النحاس بكسور وزنية مختلفة وفي حالة عدم التدعيم.قيم معامل المرونة,معامل الجساءة, اجهاد الخضوع, اجهاد الشد, اجهاد القص, اجهاد الانحناء, طاقة الكسر, مقاومة الصدمة, معامل الاحتكاك, منحنى S/N و اجهاد الكلل قد درست عند درجة حرارة الغرفة (25س) لمعرفة تاثيرالكسر الوزني لمسحوق النحاس الضافة الى الايبوكسي بمقادير (0%,5%,10% و15%). ووجد ان الزيادة في الكسر الوزني لمسحوق النحاس الى الايبوكسي و لاحجام مختلفة لجزيئات النحاس قد ادت الى زيادة في معامل المرونة,الجساءة,اجهاد الخضوع, اجهاد الاقصى ولكن في نفس الوقت ادت الى تقليل اجهاد الخضوع , طاقة الكسر و طاقة الصدمة.اخيرا الايبوكسي المدعم بنسبة (15%) ادى الى تحسين الخواص الميكانيكية للمواد المركبة مع تقليل لمعامل الاحتكاك.

Keywords

PMC --- Reinforced copper --- fatigue --- tensile


Article
Prediction and Investigation Particulate Fillers (Aluminum &Alumina) Effect on the Thermal Conductivity of Polymeric Matrix Composite (Polyester)
التنبؤ و التحقق بتأثیر الدقائق المالئة (الالومنیوم و الالومینا ) على الموصلیة الحراریة للمواد المركبة ذات أساس بولیمري( بولي استر )

Authors: Hasan A .Alasady --- IbtihalAl-Namie --- Ahmed A.M.
Journal: Engineering and Technology Journal مجلة الهندسة والتكنولوجيا ISSN: 16816900 24120758 Year: 2013 Volume: 31 Issue: 16 Part (A) Engineering Pages: 3147-3158
Publisher: University of Technology الجامعة التكنولوجية

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Abstract

The main objective of this paper is to study the thermal conductivity of compositematerials and the parameters affecting it, then to determining the validity of the besttheoretical model matching with experimental results and to predict thermalconductivity of any composite materials with different particle size.Alumina& aluminum filled thermoset polyester composites are investigated in thisstudy, and their thermal conductivity will be the central focus. Aluminum particle,alumina particle and aluminum fiber (5wt % to 45wt %) were added to polyestermatrixes. It was found that both fillers and fiber positively effect on the thermalconductivity of the composite. By using visual basic program, the results show thereare three different theoretical models (Maxwell Equation, Lord Rayleigh Equation&Lewis and Nielsen Equation) valid to predict the effective thermal conductivity forreinforced the polyester by Al and Al2O3 powder until 35wt% and 45wt% respectively.In addition, the rule of mixture model is good to predict the effective thermalconductivity (for aluminum fiber parallel with polyester matrix).

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