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Steel and Composite Structures Volume 25, Number 3, October30 2017 , pages 315-326 DOI: https://doi.org/10.12989/scs.2017.25.3.315 |
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Thermoelastic dynamic analysis of wavy carbon nanotube reinforced cylinders under thermal loads |
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Rasool Moradi-Dastjerdi and Gholamhassan Payganeh
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| Abstract | ||
| In this work, thermoelastic dynamic behavior of functionally graded carbon nanotube reinforced composite (FG-CNTRC) cylinders subjected to mechanical pressure loads, uniform temperature environment or thermal gradient loads is investigated by a mesh-free method. The material properties and thermal stress wave propagation of the nanocomposite cylinders are derived after solving of the transient thermal equation and obtaining of the time history of temperature field of the cylinders. The nanocomposite cylinders are made of a polymer matrix and wavy single-walled carbon nanotubes (SWCNTs). The volume fraction of carbon nanotubes (CNTs) are assumed variable along the radial direction of the axisymmetric cylinder. Also, material properties of the polymer and CNT are assumed temperature-dependent and mechanical properties of the nanocomposite are estimated by a micro mechanical model in volume fraction form. In the mesh-free analysis, moving least squares shape functions are used to approximate temperature and displacement fields in the weak form of motion equation and transient thermal equation, respectively. Also, transformation method is used to impose their essential boundary conditions. Effects of waviness, volume fraction and distribution pattern of CNT, temperature of environment and direction of thermal gradient loads are investigated on the thermoelastic dynamic behavior of FG-CNTRC cylinders. | ||
| Key Words | ||
| thermoelastic dynamic analysis; thermal gradient loads; wavy carbon nanotubes; nanocomposite cylinders; mesh-free | ||
| Address | ||
| Rasool Moradi-Dastjerdi: Department of Mechanical Engineering, Khomeinishahr Branch, Islamic Azad University, Khomeinishahr, Iran Gholamhassan Payganeh: Department of Mechanical Engineering, Shahid Rajaee Teacher Training University (SRTTU), Tehran, Iran | ||