Progressive failure of CFRP tubes reinforced with composite sandwich panels: Numerical analysis and energy absorption

2021 ◽  
Vol 263 ◽  
pp. 113674
Author(s):  
Yuan Chen ◽  
Lin Ye ◽  
Kunkun Fu
Keyword(s):  
Numerical Analysis ◽  
Energy Absorption ◽  
Progressive Failure ◽  
Sandwich Panels ◽  
Composite Sandwich Panels ◽  
Composite Sandwich ◽  
Cfrp Tubes

Investigation of progressive failure in the composite sandwich panels with elastomeric foam core under concentrated loading

2017 ◽  
Vol 21 (8) ◽  
pp. 2585-2615
Author(s):  
AR Nazari ◽  
MZ Kabir ◽  
H Hosseini-Toudeshky ◽  
Y Alizadeh Vaghasloo ◽  
S Najafian
Keyword(s):  
Energy Absorption ◽  
Composite Laminates ◽  
Sandwich Panels ◽  
Absorption Capacity ◽  
Foam Core ◽  
Energy Absorption Capacity ◽  
Composite Sandwich Panels ◽  
Composite Sandwich ◽  
Load Carrying ◽  
Composite Skins

Failure and damage of crushable materials employed as core for the sandwich structures reduces serviceability and energy absorption capacity of the components especially under bending load so that many beneficial properties seem to be achieved by application of noncrushable lightweight materials instead of crushable foams as core for the sandwich structures. In this paper, an elastomeric foam is employed as core for two aspect ratios of the composite sandwich panels and the enhancement of the load-carrying capacity in the elastomeric foam-cored sandwich panels is investigated in comparison to which is measured about the individual composite panels applied as skins. Both experimental and finite element simulation programs are included in the research. The load-carrying performance of the elastomeric foam-cored sandwich panels is considered dependent on two main features of the constituent materials as hyperelastic behavior of the foam core and progressive damage of the composite skins which are simulated in the finite element models in order to describe the failure mechanism in the panels. Collapse of the elastomeric foam-cored sandwich panels is considered due to connection of some failure lines in the composite skins; however, the foam core remains undamaged. The elastomeric foam core can transfer the load from the top composite skin to the bottom one so that a great energy absorption capacity is provided for these panels. The elastomeric foam after failure of the composite skins can mobilize the residual strength of the laminates to endure against large deformations prior to final collapse. By application of the composite laminates in sandwich form with elastomeric foam core, the maximum load carrying and energy absorption capacity of the composite laminates increased about 60 and 110%, respectively. The results show more favorite failure behavior for the elastomeric foam-cored sandwich panels in comparison to which is expected usually for the crushable foam-cored sandwich panels which may be concerned in many industrial applications.

scholarly journals Experimental and Numerical Analysis of Nonlinear Flexural Behaviour of Lattice-Web Reinforced Foam Core Composite Sandwich Panels

2018 ◽  
Vol 2018 ◽  
pp. 1-11 ◽  
Author(s):  
Jiye Chen ◽  
Hai Fang ◽  
Weiqing Liu ◽  
Yujun Qi ◽  
Lu Zhu
Keyword(s):  
Numerical Analysis ◽  
Carrying Capacity ◽  
Sandwich Panels ◽  
Foam Core ◽  
Load Carrying Capacity ◽  
Flexural Behaviour ◽  
Composite Sandwich Panels ◽  
Composite Sandwich ◽  
Load Carrying ◽  
The Face

This paper conducted experimental and numerical analysis of the nonlinear flexural behaviour of lattice-web reinforced foam core composite sandwich panels. Composite sandwich panels composed of a polyurethane (PU) foam core with glass fibre-reinforced polymer (GFRP) composites as the face sheets and lattice webs were fabricated through the vacuum infusion moulding process (VIMP). The flexural behaviour of these composite sandwich panels were experimentally investigated under both uniformly distributed and concentrated loading scenarios. The results showed that reinforced lattice webs can significantly increase the flexural stiffness and load-carrying capacity of sandwich panels and effectively postpone the onset of interfacial debonding failure between the face sheets and core. The effects of the lattice-web height and spacing on the ductility and load-carrying capacities of the sandwich panels were also analysed. Several numerical simulations on lattice-web reinforced foam core composite sandwich panels under concentrated loadings were also conducted. The effectiveness of the finite element (FE) model was validated by the experimental work. Parametric studies indicated that thicker face sheets and lattice webs can remarkably increase the load-carrying capacity. Moreover, the load-carrying capacity and midspan deflection were hardly affected by the foam density.

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