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Structural Engineering and Mechanics
  Volume 74, Number 5, June10 2020, pages 679-698
DOI: http://dx.doi.org/10.12989/sem.2020.74.5.679
 


Meshless Local Petrov-Galerkin (MLPG) method for dynamic analysis of non-symmetric nanocomposite cylindrical shell
Yaser Sadeghi Ferezghi, Mohamadreza Sohrabi and Seyed Mojtaba Mosavi Nezhad

 
Abstract
    In this paper, the meshless local Petrov-Galerkin (MLPG) method is developed for dynamic analysis of non-symmetric nanocomposite cylindrical shell equations of elastic wave motion with nonlinear grading patterns under shock loading. The mechanical properties of the nanocomposite cylinder are obtained based on a micro-mechanical model. In this study, four kinds of grading patterns are assumed for carbon nanotube mechanical properties. The displacements can be approximated using shape function so, the multiquadrics (MQ) Radial Basis Functions (RBF) are used as the shape function. In order to discretize the derived equations in time domains, the Newmark time approximation scheme with suitable time step is used. To demonstrate the accuracy of the present method for dynamic analysis, at the first a problem verifies with analytical solution and then the present method compares with the finite element method (FEM), finally, the present method verifies by using the element free Galerkin (EFG) method. The comparison shows the high capacity and accuracy of the present method in the dynamic analysis of cylindrical shells. The capability of the present method to dynamic analysis of non-symmetric nanocomposite cylindrical shell is demonstrated by dynamic analysis of the cylinder with different kinds of grading patterns and angle of nanocomposite reinforcements. The present method shows high accuracy, efficiency and capability to dynamic analysis of non-symmetric nanocomposite cylindrical shell, which it furnishes a ground for a more flexible design.
 
Key Words
    MLPG; cylindrical shell; nanocomposite; radial basis functions; dynamic analysis; shock loading
 
Address
Yaser Sadeghi Ferezghi, Mohamadreza Sohrabi and Seyed Mojtaba Mosavi Nezhad

Yaser Sadeghi Ferezghi, Mohamadreza Sohrabi Department of Civil Engineering, Faculty of Engineering, University of Sistan and Baluchestan, Zahedan, Iran
Seyed Mojtaba Mosavi Nezhad: Department of Civil Engineering, Faculty of Engineering, University of Birjand, Birjand, Iran
 

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