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

Abstract

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Adaptive step-size numerical vibration correlation technique for buckling prediction of thin-walled shells under axial compression and thermal loads

“…, 2017; Shahgholian-Ghahfarokhi et al ., 2019, 2020), respectively. At the same time, the method has also been extended to conical shells, stiffened shells and other shells (Shahgholian-Ghahfarokhi et al. , 2020; Tian et al.…”

“…The effectiveness of the prediction has been verified and validated from theoretical basis (Franzoni et al, 2019) and buckling test (Arbelo et al, 2015;Skukis et al, 2017;Shahgholian-Ghahfarokhi et al, 2019, respectively. At the same time, the method has also been extended to conical shells, stiffened shells and other shells (Shahgholian-Ghahfarokhi et al, 2020;Tian et al, 2020), combined load conditions (Tian et al, 2021) and variable stiffness composites (Tian et al, 2022), illustrating its advantages as a fast prediction method. However, to the best of the author's knowledge, there are very few VCT studies on combined thin-walled structures such as conical-cylindrical shells, and there is no relevant study on the application of NVCT to the prediction of axial buckling loads under thermal environments.…”

Robustness of Empirical Vibration Correlation Techniques for Predicting the Instability of Unstiffened Cylindrical Composite Shells in Axial Compression

“…A number of empirical and semi-empirical modified VCTs have been proposed to reflect the effect of imperfections on the load–natural frequency relation of shells, as recently reviewed in, e.g., [ 20 , 21 , 22 ]. The most accurate and extensively studied VCT method for unstiffened cylindrical shells, proposed in [ 23 ], departs from the common approach of relating the onset of buckling to fading of the natural frequency of the shell.…”

“…This VCT method has been applied for estimation of the buckling load in axial compression of CFRP shells of various lay-ups [ 21 , 23 , 25 , 26 , 27 , 28 ], including a variable-angle tow CFRP shell [ 28 ], as well as grid-stiffened glass/epoxy [ 29 ], composite lattice sandwich [ 22 ], stainless steel [ 26 ] and aluminum alloy [ 30 , 31 ] shells. Apart from a pure axial loading, the critical load for pressurized aluminum alloy shells [ 31 ] has also been studied.…”

“…However, a sufficiently detailed characterization of shell imperfections may be overly complicated in industrial applications. The advantage of VCT is that only a relatively uncomplicated nondestructive mechanical test of a shell is required [ 20 , 21 , 22 , 23 , 24 , 25 , 26 , 27 , 28 , 29 , 30 , 31 ] instead of a detailed inspection of different imperfections of the shell. However, the boundary conditions of the structural element have to be accurately recreated in the shell test.…”