Buckling and wrinkling of anisotropic sandwich plates

Vescovini, Riccardo; D′Ottavio, Michele; Dozio, Lorenzo; Polit, O.

doi:10.1016/j.ijengsci.2018.05.010

Cited by 55 publications

(23 citation statements)

References 66 publications

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“…The approximate solution is sought here referring to the Ritz method. The procedure is briefly outlined in the following, and the interested reader is referred to [28,[44][45][46][47][48] for more details.…”

Section: Variational Formulation and Approximate Solutionmentioning

confidence: 99%

Thermal Buckling Behaviour of Thin and Thick Variable-Stiffness Panels

Vescovini

Dozio

2018

J. Compos. Sci.

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The possibility of designing composite panels with non-uniform stiffness properties offers a chance for achieving highly-efficient configurations. This is particularly true for buckling-prone structures, whose response can be shaped through a proper distribution of the membrane and bending stiffnesses. The thermal buckling behaviour of composite panels is among the aspects that could largely benefit from the adoption of a variable-stiffness design, but, in spite of that, it has rarely been addressed. The paper illustrates a semi-analytical approach for evaluating the thermal buckling response of variable-stiffness plates (VSP) by considering different boundary conditions. The formulation relies upon the method of Ritz and a variable-kinematic approach, leading to a computationally efficient implementation, which is particularly useful for exploring the larger design spaces, typical of variable-stiffness configurations. Due to the possibility of choosing the underlying kinematic approach as an input of the analysis, the formulation is not restricted to thin plates, but is suitable for analyzing the response of thick plates as well. Novel results are derived, which can be useful for benchmarking purposes and for gathering insight into the mechanical behaviour of variable-stiffness plates. Furthermore, the importance of transverse shear flexibility is illustrated with respect to the boundary conditions as well as the degree of steering of the fibers.

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Section: Variational Formulation and Approximate Solutionmentioning

confidence: 99%

Thermal Buckling Behaviour of Thin and Thick Variable-Stiffness Panels

Vescovini

Dozio

2018

J. Compos. Sci.

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“…With full awareness of the new challenges related to the sandwich structures (anisotropy [ 1 ], influence of extreme excitations [ 2 ], new production technologies [ 3 ], and many others), this work is an attempt to take a deeper look at the known classical solutions to the local instability problem [ 4 , 5 , 6 ]. The presented solution for an orthotropic core is based on the work of [ 7 ], in which sandwich columns under compression were considered, and the solution was presented in the form of hyperbolic functions.…”

Section: Introductionmentioning

confidence: 99%

On Wrinkling in Sandwich Panels with an Orthotropic Core

et al. 2021

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This paper deals with the local loss of stability (wrinkling) problem of a thin facing of a sandwich panel. Classical solutions to the problem of a facing instability resting on a homogeneous and isotropic substructure (a core) are compared. The relations between strain energy components associated with different forms of core deformations are discussed. Next, a new solution for the orthotropic core is presented in detail, which is consistent with the classic solution for the isotropic core. Selected numerical examples confirm the correctness of the analytical formulas. In the last part, parametric analyses are carried out to illustrate the sensitivity of wrinkling stress to a change in the material parameters of the core. These analyses illustrate the possibility of using the equations derived in the article for the variability of Poisson’s ratio from −1 to 1 and for material parameters strongly deviating from isotropy.

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“…Sandwich structures are generally made of two high-strength skin layers and a low-density core layer, and they possess the advantages of high stiffness and strength with light weight [1,2]. Due to the advantages of adjustable density, easy processing, and excellent surface bonding performance of foam materials, they are generally applied in the sandwich structures as the core layer for energy absorption application [3,4]. Sandwich structures are highly susceptible to impact events that may be caused by tool drops, runway stones, hails, etc.…”

Section: Introductionmentioning

confidence: 99%

Impact and compression-after-impact behavior of sandwich panel comprised of foam core and wire nets/glass fiber reinforced epoxy hybrid facesheets

Wan

Yang

Jin

et al. 2020

Jnl of Sandwich Structures & Materials

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In this paper, we manufactured a novel sandwich panel that comprised of the foam core and the hybrid facesheets by vacuum-assisted resin infusion process. In the hybrid facesheets, the reinforcing phases are made of woven glass fabric cloth in company with wire nets, while the matrix is epoxy resin. Four categories of specimens with different wire nets contents are designed. To investigate the impact resistance ability of the designed sandwich panel, low-velocity impact tests are performed with respect to the contact load, absorbed energy, and failure mode. Compression-after-impact test is conducted to determine the residual mechanical properties of the postimpact sandwich panels. Digital image correlation technology is adopted to measure the strain distribution in the panels in compression-after-impact test. Results show that wire nets in the facesheet of the sandwich panel could enhance the energy absorb ability as well as the compression-after-impact strength significantly. Fiber/wire nets breaking, delamination, and foam core cracking are the main damage modes formed in the impact event, while the incident energy is mainly absorbed by wire nets breaking. In compression-after-impact test, bucking and delamination are the main damage modes, and the compressive stability is enhanced by the wire nets.

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Buckling and wrinkling of anisotropic sandwich plates

Cited by 55 publications

References 66 publications

Thermal Buckling Behaviour of Thin and Thick Variable-Stiffness Panels

Thermal Buckling Behaviour of Thin and Thick Variable-Stiffness Panels

On Wrinkling in Sandwich Panels with an Orthotropic Core

Impact and compression-after-impact behavior of sandwich panel comprised of foam core and wire nets/glass fiber reinforced epoxy hybrid facesheets

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