Geomechanics and Engineering

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Analyzing dynamic response of nonlocal strain gradient porous beams under moving load and thermal environment

  • Raheef, Kareem Mohsen (Mustansiriah University) ;
  • Ahmed, Ridha A. (Mustansiriah University) ;
  • Nayeeif, Adil Abed (Mustansiriah University) ;
  • Fenjan, Raad M. (Mustansiriah University) ;
  • Faleh, Nadhim M. (Mustansiriah University)
  • Received : 2019.11.05
  • Accepted : 2021.06.26
  • Published : 2021.07.10
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Abstract

This research presents dynamic response analysis of a porous functionally graded (FG) nanobeam under a moving point load. The nanobeam formulation has been established with the use of a higher-order refined beam model and nonlocal strain gradient theory (NSGT) including two scale factors named nonlocal and strain gradient factors. The porous FG material has been modeled via modified power-law functions which contain porosity volume according to even or uneven porosity dispersions. Moreover, graded nonlocality has been considered in order to provide a better modeling of size effects for FG nano-size structures. The governing equations of the nanobeam have been discretized with the use of differential quadrature method (DQM) and inverse Laplace transform approach has been utilized to calculate the dynamic deflections. The main findings of the present research indicate the influences of nonlocal strain gradient factors, moving load speed, pore amount, porosity distribution and elastic medium on dynamic deflection of FG nanobeams.

Keywords

Acknowledgement

The authors would like to thank Mustansiriyah university (www.uomustansiriyah.edu.iq) Baghdad-Iraq for its support in the present work.

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