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Buckling prediction of composite lattice sandwich cylinders (CLSC) through the vibration correlation technique (VCT): Numerical assessment with experimental and analytical verification

Shahgholian-Ghahfarokhi, Davoud and Gholamhossein, Rahimi and Gholamhossein, Liaghat and Richard, Degenhardt and Felipe, Franzoni (2020) Buckling prediction of composite lattice sandwich cylinders (CLSC) through the vibration correlation technique (VCT): Numerical assessment with experimental and analytical verification. Composites Part B Engineering, 199, p. 108252. Elsevier. doi: 10.1016/j.compositesb.2020.108252. ISSN 1359-8368.

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Official URL: https://www.sciencedirect.com/science/article/abs/pii/S1359836820333023

Abstract

One of the best nondestructive techniques to evaluate the buckling behavior of imperfection-sensitive structures is the vibration correlation technique (VCT). This paper presents an analytical formulation for the free vibration of axially loaded composite lattice sandwich cylinders (CLSC) and numerical and experimental validations of the VCT applied to such structures. From an analytical point of view, the equations are obtained through the Rayleigh-Ritz method considering first-order shear deformation theory (FSDT). For the numerical verification of the VCT, three types of linear and nonlinear finite element analyses are performed. At first, numerical results for the critical buckling load and the first natural frequency at different load levels are compared with the corresponding analytical ones, validating the numerical models. Then, the numerical models are extended considering geometric nonlinearities and imperfection to simulate the variation of the first natural frequency of vibration with the applied load. As well, a nonlinear buckling analysis is also performed using the Riks method for a better comparison of the VCT results. In the last section, four specimens are fabricated using a new rubber mold and a filament winding machine. Additionally, the experimental buckling test is carried out, verifying the results of the VCT approach. The results demonstrate that the maximum difference between the estimated buckling load using the VCT approach and the corresponding nonlinear and experimental buckling loads is less than 5%, being the VCT result more accurate than the numerical one. Moreover, the proposed VCT provided a good estimation of the buckling load of the CLSC, considering a maximum load level of at least 62.1% of the experimental buckling load.

Item URL in elib:https://elib.dlr.de/136956/
Document Type:Article
Title:Buckling prediction of composite lattice sandwich cylinders (CLSC) through the vibration correlation technique (VCT): Numerical assessment with experimental and analytical verification
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Shahgholian-Ghahfarokhi, DavoudD.Shahgholian (at) modares.ac.irhttps://orcid.org/0000-0002-8408-8374
Gholamhossein, Rahimirahimi_gh (at) modares.ac.irhttps://orcid.org/0000-0002-0247-8839
Gholamhossein, Liaghatghlia530 (at) modares.ac.irhttps://orcid.org/0000-0003-1925-0643
Richard, Degenhardtrichard.degenhart (at) dlr.deUNSPECIFIED
Felipe, Franzonifelipe.franzoni (at) dlr.dehttps://orcid.org/0000-0002-9977-7607
Date:October 2020
Journal or Publication Title:Composites Part B Engineering
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:199
DOI :10.1016/j.compositesb.2020.108252
Page Range:p. 108252
Publisher:Elsevier
ISSN:1359-8368
Status:Published
Keywords:BucklingVibration correlation technique (VCT)Composite lattice sandwich cylinders (CLSC)Analytical approachFinite element analysisExperimental testImperfection-sensitive structures
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:fixed-wing aircraft
DLR - Research area:Aeronautics
DLR - Program:L AR - Aircraft Research
DLR - Research theme (Project):L - Structures and Materials (old)
Location: Braunschweig
Institutes and Institutions:Institute of Composite Structures and Adaptive Systems > Structural Mechanics
Deposited By: Franzoni, Felipe
Deposited On:09 Nov 2020 10:29
Last Modified:09 Nov 2020 10:29

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