Eventos Anais de eventos
COBEM 2019
25th International Congress of Mechanical Engineering
ITERATIVE CONDENSATION STRATEGY TO FATIGUE ANALYSIS OF VISCOELASTICALLY DAMPED STRUCTURES
Submission Author:
Ulisses Lima Rosa , MG
Co-Authors:
Lauren Karoline Sousa Gonçalves, Ulisses Lima Rosa, Antonio Marcos de Lima
Presenter: Ulisses Lima Rosa
doi://10.26678/ABCM.COBEM2019.COB2019-0139
Abstract
Looking for structures' durability, safety, reliability and comfort have been motivated the study about increase of the fatigue life using viscoelastic dampers. However, analysis of dynamic responses and fatigue criteria of viscoelastic stochastic models could be prohibitive due to the computational time required to solve full models’ formulations and the number of degrees of freedom involved. These models require the use of reduction basis particularly suitable that consider the frequency and temperature. In this sense, the purpose of this work is to evaluate computational gain of a proposed iterative reduction basis representing the stochastic behavior of a three-layer sandwich plate structure, treated with a passive constrained damping layer under Gaussian random loadings. Reduced results are then compared with the full model via numerical simulations. Numerical results are presented in terms of frequency responses functions (FRFs), stress responses (PSDs) and fatigue indexes estimated by Sines’ criterion. With this approach, it is possible to highlight the robustness of the iterative condensation strategy.
Keywords
stochastic finite elements method, Passive control, fatigue, reduction methods
