PORTO @ Archivio Istituzionale della Ricerca

Descrizione: This work intends to present a novel numerical approach for carrying out virtual Vibration Correlation Technique (VCT) in stiffened and unstiffened structures subjected to mechanical and thermal loadings in order to predict the buckling load, to characterize the natural frequencies variation for progressively increasing loads, and to provide a verification of the experimental VCT results. The study has been performed using the well-established Carrera Unified Formulation (CUF) able to describe several kinematic models for one-dimensional (1D) and two-dimensional (2D) structures. All Green-Lagrange strain components are employed because far nonlinear regimes are investigated. Furthermore, the geometrical nonlinear equations are written in a total Lagrangian framework and solved with an opportune Newton-Raphson method along with a path-following approach based on the arc-length constraint. Different structures have been investigated and compared with the Abaqus solution in order to validate the proposed approach and provide some benchmark solutions. The results document the good accuracy and reliability of the proposed approach and show this numerical tool's potentialities. The virtual VCT can be used effectively during the preparation of experimental tests in order to appropriately investigate the boundary conditions to be applied or it can be a powerful method to be used to investigate cases that are difficult to analyze experimentally, such as structures subjected to thermal or shear loads.

Tipologia: 2. Post-print / Author's Accepted Manuscript

Licenza: Non Pubblico - Accesso privato/ristretto