Eventos Anais de eventos
COBEM 2023
27th International Congress of Mechanical Engineering
Improved stochastic modeling of hygrothermal influences on the buckling response of laminated composite plates
Submission Author:
Henrique Santos , SP
Co-Authors:
Henrique Santos, Domingos Rade
Presenter: Henrique Santos
doi://10.26678/ABCM.COBEM2023.COB2023-1105
Abstract
The effects of moisture and temperature on the buckling response of laminated composite plates are numerically investigated in this paper. Due to the complexity of physical mechanisms which determine the environmental and operational conditions in many cases of interest, temperature and moisture variations around a structure can be hardly controlled, and can be more appropriately characterized as random quantities. Hence, in the context of Uncertainty Quantification (UQ), this paper aims at investigating the influence of space-dependent stochastic hygrothermal conditions on the buckling resistance of composite laminate plates. Differently from the majority of previous investigations, uncertainty quantification takes into account the combined influences of the environmental effects on the properties of the material and the hygrothermally-induced stresses. For this purpose, a model based on the Rayleigh-Ritz approach under the hypotheses of the Classical Lamination Theory is proposed to perform buckling analysis considering hygrothermal and mechanical influences, using the micromechanical approach to account for the degradation of material properties as a consequence of space-dependent random variations in environmental factors. The Karhunen-Loève expansion is used to discretize thermal and moisture fluctuations as stationary two-dimensional random fields. Then, sampling-based statistics are presented for the critical buckling load adopting different values of standard deviations and correlation lengths associated to the random fields. From the simulations scenarios analyzed, it is observed an increase in dispersion of buckling resistance as both correlation length and standard deviation are increased. Also, the convenience of accounting for random environmental uncertainties in the analysis and design of reliable and robust composite structures is highlighted.
Keywords
hygrothermal-mechanical buckling, Uncertainty quantification., Random Field, micromechanical modeling, laminated composite plates
