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On the geometrically nonlinear analysis of sandwich shells with viscoelastic core: a layerwise dynamic finite element formulation
, Article Composite Structures ; Volume 230 , 2019 ; 02638223 (ISSN) ; Khorasani, R ; Sharif University of Technology
Elsevier Ltd
2019
Abstract
The objective of this work is to present a finite element formulation for dynamic analysis of sandwich shells with viscoelastic core under large deformation. The present study is based on an incremental updated Lagrangian approach together with the Newmark integration scheme. The viscoelastic constitutive model which is used to define the behavior of the core, comes from the Riesz theorem and the corresponding creep functions are estimated using Dirichlet-Prony series. Also, the viscoelastic deferred strain is derived in an appropriate incremental form using the state variables. The employed layerwise shell element which is based on zig-zag theory has eight nodes on its mid layer. What's...
Clearance effects on dynamic behavior of a continuous mechanical system
, Article JVC/Journal of Vibration and Control ; Volume 21, Issue 13 , October , 2015 , Pages 2509-2519 ; 10775463 (ISSN) ; Momeni Massouleh, S. H ; Khorasani, R ; Sharif University of Technology
SAGE Publications Inc
2015
Abstract
An analytical modified method is presented to investigate the clearance effects on the dynamic behavior of cantilever beams. In this work, apart from clearance, all other nonlinearities are avoided to be considered during the analytical solution. The beam is idealized using an equivalent single-degree-of-freedom structure. A tri-linear stiffness system is also adopted to simulate the beam together with the clearance. Subsequently the analytical solution is derived for a cantilever beam structure with and without considering structural damping. The experimental method is employed to verify the results from the presented analytical solutions. It is noted that the results obtained by the...