توجه: محتویات این صفحه به صورت خودکار پردازش شده و مقاله‌های نویسندگانی با تشابه اسمی، همگی در بخش یکسان نمایش داده می‌شوند.
۱Fractional Derivatives and its Applications in Mechanics
نویسنده(ها):
اطلاعات انتشار: دوازدهمین کنفرانس دینامیک شاره ها، سال
تعداد صفحات: ۶
In this paper some of the basic applications of fractional calculus in mechanics presented In addition, the underlying mathematical background and some historical remarks are given. The point in the paper is on the application of fractional calculus in viscoelasticity. Also it is shown in the paper that fractional derivatives can be successfully used in modeling some of the boundary conditions in fluid mechanics.<\div>

۲Feasibility study of porous Fe–Al2O3 composite fabrication through combination of SPS and SHS processes
اطلاعات انتشار: دومین کنفرانس بین المللی کامپوزیت، سال
تعداد صفحات: ۶
In this study, fabrication of Fe–Al2O3 porous composite through combination of two non conventional material processing techniques of spark plasma sintering (SPS) and self propagating high–temperature synthesis (SHS) was investigated. Mixtures of Fe, Al and Fe2O3 powders, containing different amounts of each, were used as starting materials. Applying pulsed electric current to the powder was caused to the formation of Al2O3 and releasing of heat by reaction of Al and Fe2O3 according to: 2Al + Fe2O3 = Al2O3 + 2Fe. In addition, pulsed current flow through the powder heated up it by joule effect and supplied required energy for sintering. Fabrication of composite foam in time duration shorter than 5 minutes is the main feature of this process. It was found that increasing of Fe2O3 and Al contents in the primary mixture would result in an increase of Al2O3 and porosity at a constant sintering time.<\div>

۳Fabrication of Aluminium–Carbon nanotube Composites Via Spark Plasma Sintering Method
نویسنده(ها): ، ،
اطلاعات انتشار: دومین همایش بین المللی و هفتمین همایش مشترک انجمن مهندسی متالورژی ایران و انجمن ریخته گری ایران، سال
تعداد صفحات: ۵
In this study, an attempt was performed on the fabrication of Aluminum–Carbon nanotube composites (Al–CNTs) by Spark Plasma Sintering (SPS) method. Aluminum matrix composites reinforced with 0 to 5 wt. % multi–wall carbon nanotubes (MWCNTs) were fabricated by mixing the composite powders, as starting materials, in ball mill for 1h and consequently sintered at 550oC using a spark plasma sintering (SPS) apparatus. The microstructures of these composites were characterized by TEM and SEM and also microhardness and compression testing of Al–CNT composites were carried out. The chemical compositional analysis of bulk samples of the spark plasma sintered aluminum–carbon nanotube composites were done by X–ray diffraction (XRD). The results show the successful synthesis of product by novel SPS method and also the improvement in hardness and compressive strength of Al–1%CNT composite compared to pure Al samples, but then decrease with increasing the content of MWCNTs due to the agglomeration of MWCNTs<\div>

۴Microstructure and hardness evaluation of Al–SiO2 nanocomposites produced with ultrasonic technique
نویسنده(ها): ، ،
اطلاعات انتشار: سومین کنفرانس بین‌المللی آلومینیوم ایران IIAC2014، سال
تعداد صفحات: ۷
Light weight metal matrix nanocomposites (MMNCs) can be so useful for automobile, aerospace and numerous other applications, but it is extremely difficult to disperse nanosized ceramic particles uniformly in liquid metals. Hence, this paper presents an inexpensive method for fabrication of aluminum matrix nanocomposites reinforced with SiO2 nano–sized ceramic particles. In this method, ultrasonic technique was used for increasing wettability of reinforcement nanoparticles within the aluminum melt. Microstructure study of aluminum matrix nanocomposites reinforced with different weight percentages of silicon dioxide nanoparticles (0.25, 0.5, 0.75 and 1.0 wt.%) were carried out with an optical microscope and SEM and then hardness of the samples were investigated. SEM observations validate uniform dispersion of nano–sized SiO2 in metal matrix. Hardness of the samples is also significantly increased by addition of SiO2 nanoparticles and Al–SiO2 nanocomposite at 0.75 wt.% SiO2 produces the highest hardness<\div>
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