Eventos Anais de eventos
COBEM 2021
26th International Congress of Mechanical Engineering
Uncertainty Propagation and Reliability Analysis of Conventional and Tow-Steered Composite Plates
Submission Author:
Henrique Santos , SP
Co-Authors:
Henrique Santos, Domingos Rade, Leandro Cunha
Presenter: Henrique Santos
doi://10.26678/ABCM.COBEM2021.COB2021-0385
Abstract
The uncertainty propagation and reliability analysis of conventional and tow-steered composite laminate plates subjected to various sources of uncertainties are numerically investigated in this paper. A model based on the Rayleigh-Ritz approach with the hypotheses of the Classical Lamination Theory is proposed to incorporate uncertainties affecting the following: the lamina fiber volume, which is modeled as a two-dimensional random field described by the Karhunen-Loève Expansion; the boundary conditions, where discrete springs are modeled as random variables; and some specific parameters of fiber trajectory definition, which are also modeled as random variables. By considering the behavior of rectilinear and curvilinear fiber laminates in terms of linear buckling loads, the Monte Carlo Simulation (MCS) is used for uncertainty propagation and the reliability assessment is performed with the first-order reliability method (FORM) and also with MCS for a conventional and two tow-steered composite laminates with optimized fiber trajectories. The reliability results are compared and accurate results from FORM are observed with a significant reduction of computational costs. Additionally, the presented incorporation and quantification of uncertainties indicate the benefits of fiber steering technology and seem to be useful in designing real composite structures.
Keywords
Tow-steered laminates, Uncertainty propagation, reliability analysis, Buckling, First-order reliability method (FORM)
