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Advances in Nano Research Volume 8, Number 2, February 2020 , pages 157-167 DOI: https://doi.org/10.12989/anr.2020.8.2.157 |
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Dynamic characteristics of multi-phase crystalline porous shells with using strain gradient elasticity |
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Ridha A. Ahmed, Ammar F.H. Al-Maliki and Nadhim M. Faleh
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| Abstract | ||
| This paper studies forced vibrational behavior of porous nanocrystalline silicon nanoshells under radial dynamic loads using strain gradient theory (SGT). This type of material contains many pores inside it and also there are nano-size grains which define the material character. The formulation for nanocrystalline nanoshell is provided by first order shell theory and a numerical approach is used in order to solve nanoshell equations. SGT gives a scale factor related to stiffness hardening provided by nanograins. For more accurate description of size effects due to nano-grains or nano-pore, their surface energy influences have been introduced. Surface energy of inclusion exhibit extraordinary influence on dynamic response of the nanoshell. Also, dynamic response of the nanoshell is affected by the scale of nano-grain and nano-pore. | ||
| Key Words | ||
| nanocrystalline material; forced vibration; porous nanoshell; strain gradient; Mori-Tanaka scheme | ||
| Address | ||
| Al-Mustansiriah University, Engineering Collage P.O. Box 46049, Bab-Muadum, Baghdad 10001, Iraq. | ||