Modeling of Impacts on Sandwich Structures

Navarro, Pablo; Marguet, Steven; Ferrero, Jean-François; Barrau, Jean-Jacques; Lemaire, Sandrine

doi:10.1080/15376494.2011.556841

Cited by 8 publications

(4 citation statements)

References 17 publications

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“…In this study, the vibration of impactor is neglected. The overall contact force P c during the loading phase is related to local contact indentation δ( t ) and defined by a non-linear relation as follows ( 31 , 32 ) : …”

Section: Non-linear Dynamics Of Impactormentioning

confidence: 99%

Low-velocity impact response of sandwich cylindrical panels with nanotube-reinforced and metal face sheet in thermal environment

Bayat

Mashhadi

Rahmani³

2018

Aeronaut. j.

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Employing an analytical method, non-linear low-velocity impact response of carbon nanotube (CNT)-reinforced sandwich cylindrical panels in thermal environments is analysed. Two types of core (i.e. homogenous and functionally graded) are considered for sandwich panels. The face sheets of sandwich panels are multi-layer which consist of CNT-reinforced composite (CNTRC) and metal layers. Micromechanical models are used to estimate the material properties of CNTRCs. A higher-order shear deformation theory with a von Kármán-type of kinematic non-linearity provides the equations of motion. Temperature-dependent material properties are used to include the thermal effects. The equations of motion are solved using a two-step perturbation technique. Existing numerical results in the literature are used to validate the present method. The effect of nanotube volume fraction, material property gradient, impactor initial velocity, geometrical parameters of cylindrical panel, temperature change and edge boundary condition on the impact response of cylindrical panel structures is discussed. The quantitative results and analytical formulations can be helpful in better designing of CNTRC structures subjected to low-velocity impact in thermal environments.

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Section: Non-linear Dynamics Of Impactormentioning

confidence: 99%

Low-velocity impact response of sandwich cylindrical panels with nanotube-reinforced and metal face sheet in thermal environment

Bayat

Mashhadi

Rahmani³

2018

Aeronaut. j.

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“…Generally, for a better representation of the damage scenario, the composite skin and the core have to be modeled separately. This is all the more true when complex loading, like oblique impacts, are studied [9,10,11]. For the modeling of the woven composite skin, the representation scale varies from the homogenized skin to the representation of the bundles of fibers with solid elements [12,13,14,15,16,17,18,19].…”

Section: Introductionmentioning

confidence: 99%

Impact damage prediction in thin woven composite laminates – Part II: Application to normal and oblique impacts on sandwich structure

Pascal

Rogani

Mahmoud

et al. 2018

Composite Structures

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This article concerns the Finite Element modeling of impacts on composite sandwich structures. Low velocity normal impacts and medium velocity oblique impacts on sandwich panels made with woven composite skins and a polyurethane foam core are investigated. The ply orientations and materials of the woven composite laminate skin are varied. The woven skin is modeled using a semi-continuous approach, described in the first part of this two parts article, in which the behavior of the bundles of fibers and that of the resin are disconnected. The foam core is represented with solid elements with a continuous material law. This modeling strategy provides results accurate enough to represent the damage scenario observed experimentally with an acceptable calculation time. The numerical results are used to analyze the damage mechanisms leading to the final fracture shape.

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“…Traditionally, the most widespread material used for energy mitigation is metal due to its structural failure and plastic deformation. [3][4][5] Foam-filled columns [6][7][8][9][10][11] and sandwich structures [12][13][14][15][16][17] also show excellent performance in mitigating energy propagation due to their buckling mechanism. Another conventional form for energy absorption is internal damping by polymer composites.…”

Section: Introductionmentioning

confidence: 99%

Molecular dynamics study of a CNT–buckyball-enabled energy absorption system

Chen

Zhang

Becton

et al. 2015

Phys. Chem. Chem. Phys.

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An energy absorption system (EAS) composed of a carbon nanotube (CNT) with nested buckyballs is put forward for energy dissipation during impact owing to the outstanding mechanical properties of both CNTs and buckyballs. Here we implement a series of molecular dynamics (MD) simulations to investigate the energy absorption capabilities of several different EASs based on a variety of design parameters. For example, the effects of impact energy, the number of nested buckyballs, and of the size of the buckyballs are analyzed to optimize the energy absorption capability of the EASs by tuning the relevant design parameters. Simulation results indicate that the energy absorption capability of the EAS is closely associated with the deformation characteristics of the confined buckyballs. A low impact energy leads to recoverable deformation of the buckyballs and the dissipated energy is mainly converted to thermal energy. However, a high impact energy yields non-recoverable deformation of buckyballs and thus the energy dissipation is dominated by the strain energy of the EAS. The simulation results also reveal that there exists an optimal value of the number of buckyballs for an EAS under a certain impact energy. Larger buckyballs are able to deform to a larger degree yet also need less impact energy to induce plastic deformation, therefore performing with a better overall energy absorption ability. Overall, the EAS in this study shows a remarkably high energy absorption density of 2 kJ g(-1), it is a promising candidate for mitigating impact energy and sheds light on the research of buckyball-filled CNTs for other applications.

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Modeling of Impacts on Sandwich Structures

Cited by 8 publications

References 17 publications

Low-velocity impact response of sandwich cylindrical panels with nanotube-reinforced and metal face sheet in thermal environment

Low-velocity impact response of sandwich cylindrical panels with nanotube-reinforced and metal face sheet in thermal environment

Impact damage prediction in thin woven composite laminates – Part II: Application to normal and oblique impacts on sandwich structure

Molecular dynamics study of a CNT–buckyball-enabled energy absorption system

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