Dynamic Instability of Sandwich Panels

December 14, 2022

Laminated composite plates and sandwich plates present better properties when compared to other similar structures. They are used in a wide range of industries and applications but, to do so, it is important to study their mechanical behaviour. These structures are usually under different kinds of loads, static or dynamic. For that reason, it is important to study their dynamic behaviour to improve the design process and avoid failure. In the present work two models to analyse isotropic, orthotropic and laminated composite plates were developed in Matlab. These models are based on the FSDT and the HSDT. These formulations are then used to model a sandwich plate. Using a mixed layer-wise approach, the core is modelled with the HSDT and the face sheets use the FSDT. The finite element model applies an eight-node serendipity quadratic element. A free vibration analysis was performed in order to validate the formulation of the mass and stiffness matrices. Later on, the dynamic instability regions for isotropic, orthotropic, laminated composite and sandwich plates are studied. Through these analyses, the results were validated with the ones present in the literature. A special case of sandwich plates, when the core is made of viscoelastic materials, is, also, studied.

Authors in the community:

• 

  R

  Rita Alves Baía dos Santos

  ist189710

Supervisors of this institution:

• 

  A

  Aurélio Lima Araújo

  ist62256

mechanical-engineering - Mechanical engineering

eng - English

Instituto Superior Técnico