توجه: محتویات این صفحه به صورت خودکار پردازش شده و مقاله‌های نویسندگانی با تشابه اسمی، همگی در بخش یکسان نمایش داده می‌شوند.
۱Effects of SiO2 and TiO2 nanoparticles on the mechanical and tribological behaviors of epoxy resin
نویسنده(ها): ، ،
اطلاعات انتشار: کنفرانس دو سالانه بین المللی مکانیک جامدات تجربی، سال
تعداد صفحات: ۶
In this manuscript, mechanical and tribological behaviors of SiO2\epoxy, TiO2\epoxy nanocomposites are investigated under scratch and nano indentation loading by using Hysitron nano indentation testing instrument. For each nanocomposites 5 wt. % of nanoparticles were added to the epoxy and experimental results showed that adding nanoparticles to resin increases its hardness and elastic modulus. It is also indicated that addition of particles causes in a decrease of coefficient of friction and scratch depth of the specimens. Furthermore, the specimens containing the nano particles showed less surface deformation in comparison with the neat epoxy resin under the same specified external point loading. Specifically, the SiO2\epoxy specimens showed least deformation, followed by TiO2\epoxy Nano composites. The result of scratch and indentation tests and AFM images showed that the penetration depth decreases by adding nanoparticle. For instance the indentation test of SiO2\Epoxy shows 42% decrease in the penetration depth compared with the neat epoxy. Also, the scratch test of SiO2\Epoxy shows 75% decrease in comparison with the neat epoxy. The results showed that TiO2\epoxy nano composites had a tendency to decrease the coefficient of friction.<\div>

۲The mechanical and tribological behaviors of phenolic polymers modified with silica nanoparticles
نویسنده(ها): ، ،
اطلاعات انتشار: کنفرانس دو سالانه بین المللی مکانیک جامدات تجربی، سال
تعداد صفحات: ۶
The present paper considers the mechanical and wear properties of three different phenolic polymer Nano composites containing 0, 1 and 2 wt. % of well–dispersed silica nanoparticles. Firstly, it was found that for any given phenolic polymer, the Young’s modulus steadily increased as the weight percent of silica nanoparticles was risen. For phenolic polymer with 1 and 2 wt. % Nano silica, Young’s modulus was increased 7% and 12.5%, respectively in comparison with the neat phenolic resin. Second, the presence of 2 wt. % silica nanoparticles increased the hardness of the phenolic polymer by 27.3% compared with the pure phenolic resin. Third, the Nano indentation tests showed that the depth penetrations of pure phenolic resin was decreased steadily by increasing the silica nanoparticle from 0 to 2% wt. The results of scratch tests showed that Nano silica has no effect on the coefficient of friction and wear rate.<\div>
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