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Frontiers of Structural and Civil Engineering

ISSN 2095-2430

ISSN 2095-2449(Online)

CN 10-1023/X

Postal Subscription Code 80-968

2018 Impact Factor: 1.272

Front. Struct. Civ. Eng.    2023, Vol. 17 Issue (2) : 179-190    https://doi.org/10.1007/s11709-022-0888-z
RESEARCH ARTICLE
Probabilistic stability of uncertain composite plates and stochastic irregularity in their buckling mode shapes: A semi-analytical non-intrusive approach
Arash Tavakoli MALEKI1, Hadi PARVIZ2, Akbar A. KHATIBI3(), Mahnaz ZAKERI1()
1. Advanced Structures Research Laboratory, K. N. Toosi University of Technology, Tehran 16569-83911, Iran
2. Faculty of New Sciences and Technologies, University of Tehran, Tehran 16569-83911, Iran
3. School of Engineering, RMIT University, Melbourne VIC 3001, Australia
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Abstract

In this study, the mechanical properties of the composite plate were considered Gaussian random fields and their effects on the buckling load and corresponding mode shapes were studied by developing a semi-analytical non-intrusive approach. The random fields were decomposed by the Karhunen−Loève method. The strains were defined based on the assumptions of the first-order and higher-order shear-deformation theories. Stochastic equations of motion were extracted using Euler–Lagrange equations. The probabilistic response space was obtained by employing the non-intrusive polynomial chaos method. Finally, the effect of spatially varying stochastic properties on the critical load of the plate and the irregularity of buckling mode shapes and their sequences were studied for the first time. Our findings showed that different shear deformation plate theories could significantly influence the reliability of thicker plates under compressive loading. It is suggested that a linear relationship exists between the mechanical properties’ variation coefficient and critical loads’ variation coefficient. Also, in modeling the plate properties as random fields, a significant stochastic irregularity is obtained in buckling mode shapes, which is crucial in practical applications.

Keywords uncertain composite plate      stochastic assume mode method      Karhunen−Loève theorem      polynomial chaos approach      plate buckling      irregularity in buckling mode shapes     
Corresponding Author(s): Akbar A. KHATIBI,Mahnaz ZAKERI   
Just Accepted Date: 07 December 2022   Online First Date: 13 February 2023    Issue Date: 03 April 2023
 Cite this article:   
Arash Tavakoli MALEKI,Hadi PARVIZ,Akbar A. KHATIBI, et al. Probabilistic stability of uncertain composite plates and stochastic irregularity in their buckling mode shapes: A semi-analytical non-intrusive approach[J]. Front. Struct. Civ. Eng., 2023, 17(2): 179-190.
 URL:  
https://academic.hep.com.cn/fsce/EN/10.1007/s11709-022-0888-z
https://academic.hep.com.cn/fsce/EN/Y2023/V17/I2/179
Fig.1  Schematic of the composite plate with simply supported boundary conditions under: (a) uniaxial; (b) biaxial loading; and clamped boundary conditions subjected to: (c) uniaxial; (d) biaxial loading.
propertyquantity
E11/E2240
G12/E22=G13/E220.6
G23/E220.5
υ120.25
Tab.1  Material properties of composite lamina [53]
a/hθFSDT [53]HSDT [53]RPT [54]present-FSDTpresent-HSDT
4307.5459.33919.35187.5459.3391
456.78588.23778.39636.78588.2377
103016.613217.126917.279516.613217.1269
4517.552218.154418.154417.552218.1544
1003020.494420.501720.50420.494420.5017
4521.657621.666121.666321.657621.6661
Tab.2  The normalized buckling load comparison
Fig.2  Comparison of buckling load variation coefficient obtained from our study with previous studies of plates with random properties.
Fig.3  PDF corresponding to the normalized buckling load of square plates for symmetric (a) uniaxial loading and (b) biaxial loading; for antisymmetric (c) uniaxial loading and (d) biaxial loading.
Fig.4  Uncertainty propagation in normalized buckling load: (a) uniaxial loading; (b) biaxial loading.
Fig.5  Variation coefficient of critical buckling load for plates with different boundary conditions: (a) simply supported; (b) clamped.
boundary condition mode number deterministic stochastic
sample 1 sample 2 sample 3 sample 4
SSSS 1
2
3
CCCC 1
2
3
Tab.3  Deterministic and four stochastic samples of the three first buckling mode shapes.
Fig.6  Probability density function (PDF) for three critical buckling values in the symmetric plate with (a) simply supported and (b) clamped boundary conditions.
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[1] Mahdi FAKOOR, Hadi PARVIZ. Uncertainty propagation in dynamics of composite plates: A semi-analytical non-sampling-based approach[J]. Front. Struct. Civ. Eng., 2020, 14(6): 1359-1371.
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