توجه: محتویات این صفحه به صورت خودکار پردازش شده و مقاله‌های نویسندگانی با تشابه اسمی، همگی در بخش یکسان نمایش داده می‌شوند.
۱Effect of thickness of thin films on mechanical properties measured by nano–indentation and comparison with molecular dynamic (MD) simulation
نویسنده(ها): ، ،
اطلاعات انتشار: کنفرانس دو سالانه بین المللی مکانیک جامدات تجربی، سال
تعداد صفحات: ۱۰
Thin films have become increasingly important in physics and engineering due to their uses in semiconductors, mirrors, lens coatings, and many other applications. This field will become even more vibrant as we try to make appliances and systems smaller and thinner.Nano–indentation is one of the most known methods for investigating the properties of thin films. It is a known fact that thin layers are characterized by different mechanical properties than their bulk samples. This study focuses on investigation of different thin layers by nano–indentation test with a support of molecular dynamic simulation. In order to carry out the study, thin layers of different thickness values were coated on a substrate. The coated samples were simulated in LAMMPS, molecular dynamic software, and the Young’s modulus and hardness of coatings were determined. The results were then compared with the experimental data available in literature.<\div>

۲Tribological effect of thermocycling on dental nano–composite
نویسنده(ها): ،
اطلاعات انتشار: کنفرانس دو سالانه بین المللی مکانیک جامدات تجربی، سال
تعداد صفحات: ۶
The effect of thermocycling on the tribological properties of a commercial dental nano–composite has been studied by using the nano–scratch experiment. For this purpose some disk specimens from Filtek Z350 XT (3M ESPE, Germany) nano–composite, each of the diameter 10 mm and the thickness 4 mm were prepared. Half of the specimens were stored in distilled water at ambient conditions and the other half were thermocycled in distilled water for 1000 cycles between temperatures 5°C and 55°C. The nano–scratch experiment was applied on both non–thermocycled and thermocycled specimens by using Triboscope system (Hysitron Inc., USA) and Berkovich indenter. The nano–scratch experiments were performed by both constant and increasing loads for each sample. Atomic force microscopy (AFM) images were taken from the scratch site for analyzing the surface deformation of the samples. The scratch profile, residual scratch depth, scratch hardness and critical scratch load were obtained from the nano–scratch test and AFM images. The results indicate that the residual scratch depth and the criticalscratch load of the thermocycled samples have been decreased compared to the non–thermocycled ones. However, the scratch hardness of the thermocycled samples has been increased in comparison to the non–thermocycled specimens.<\div>
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