Influences of material gradient and nonlinearity on the forced vibration of orthotropic shell structures

2021 ◽  
pp. 114157
Author(s):  
A.H. Sofiyev ◽  
F. Turan ◽  
N. Kuruoglu
Keyword(s):  
Forced Vibration ◽  
Orthotropic Shell ◽  
Shell Structures

Optimization of material orientation for orthotropic shell structures

2016 ◽  
Vol 2016.29 (0) ◽  
pp. 4_200
Author(s):  
Yoshiaki Muramatsu ◽  
Masatoshi Shimoda
Keyword(s):  
Orthotropic Shell ◽  
Shell Structures ◽  
Material Orientation

Forced Vibration Analysis of FG-Graphene Platelet Reinforced Polymer Composite Shells Bonded With Piezoelectric Layers Considering Electroelastic Nonlinearities

2018 ◽  
Author(s):  
M. N. Rao ◽  
R. Schmidt ◽  
K.-U. Schröder
Keyword(s):  
Polymer Composites ◽  
Forced Vibration ◽  
Composite Shell ◽  
Constitutive Relations ◽  
Weight Fraction ◽  
Shell Structures ◽  
Control Analysis ◽  
Composite Shells ◽  
Piezoelectric Layers ◽  
And Control

In the present article, we focus on the forced vibration and control analysis of functionally graded (FG) graphene-polymer composites bonded with piezoelectric layers considering strong electric fields. Different non-uniform gradient distributions of graphene platelets (GPLs) are assumed through the thickness direction. The Modified Halpin-Tsai micromechanics model is used to obtain the effective material properties of GPL/polymer composites. Electromechanical coupling of piezoelectric layers is described by two rotationally invariant non-linear constitutive relations. A four-node shell element considering transverse shear effect based on the Reissner-Mindlins hypothesis has been developed for forced vibration and control analysis of smart FG-GPL/composites using the principle of virtual work considering nonlinear material law for the piezoelectric layers. The developed element is verified and compared with the numerical results those available in the literature. Different configurations of FG-GPL composite shells have been analysed and discussed to compare in terms of settling time, first resonance frequency and absolute amplitude corresponding to first resonant frequency by carrying out time and frequency response analysis, and the effects of weight fraction of GPLs on vibration response of such shell structures are also discussed. The influence of electromechanical nonlinear constitutive relations is also presented and discussed by performing active control analysis on different FG-GPL composite shell structures. Moreover, the results show that the GPL distribution and weight-fraction of GPLs have a significant effect on the vibration and damping characteristics of the FG-GPL composite shell structures.

Strength and stability of geometrically nonlinear orthotropic shell structures

2016 ◽  
Vol 106 ◽  
pp. 428-436 ◽  
Author(s):  
A.A. Semenov
Keyword(s):  
Orthotropic Shell ◽  
Shell Structures ◽  
Geometrically Nonlinear

Influence of fasteners and connections flexibility on deflections of steel building including the stressed skin effect

2018 ◽  
Vol 2 (21) ◽  
pp. 131-148 ◽  
Author(s):  
Natalia Korcz ◽  
Elżbieta Urbańska-Galewska
Keyword(s):  
Finite Elements ◽  
Skin Effect ◽  
Numerical Models ◽  
Orthotropic Shell ◽  
3D Structure ◽  
Negligible Effect ◽  
Transverse Stiffness ◽  
Shell Models ◽  
Steel Building ◽  
Two Sides

The paper presents the analysis of the influence of fasteners and connections flexibility on displacements of symmetrical single-bay pitched-roof steel building, including trapezoidal cladding acting as a diaphragm. The purpose of the article was to compare numerical models with and without taking into consideration fasteners and connections flexibility in order to observe the differences in transverse stiffness of the building during modifying model from the simple one to more complex and precise. The analyses were carried out for the 3D structure. Fasteners and connections were substituted by equivalent beam finite elements. Corrugated sheets were replaced by three types of equivalent orthotropic shell models and the influence of the choice of the model on the stiffness of the building was observed. The results showed that in the analysed structure the flexibility of fasteners and connections has negligible effect on transverse displacements of the building in the case of four sides fastening of the sheeting, however in the case of two sides fastening the influence significantly increases.

Current Status of Magnetite-Based Core@Shell Structures for Diagnosis and Therapy in Oncology Short running title: Biomedical Applications of Magnetite@Shell Structures

2015 ◽  
Vol 21 (37) ◽  
pp. 5417-5433 ◽  
Author(s):  
Ângela Andrade ◽  
José Fabris ◽  
Rosana Domingues ◽  
Márcio Pereira
Keyword(s):  
Biomedical Applications ◽  
Shell Structures ◽  
Current Status ◽  
Core Shell ◽  
Diagnosis And Therapy
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