Fabrication and Evaluation of Multilayered Polyurethane Foam Core Sandwich Panels for Static Flexural Stiffness

Abstract

Light weight sandwich laminated panels are increasingly being used as structural materials for a wide variety of applications in marine, aerospace, automobile, transportation and electronic packing sectors. These sandwich panels are separated by stiff and strong face sheets, with low density core such as polyurethane foam, corrugated polyvinyl chloride sheets, aluminum honeycomb or polystyrene cellular solids. The core provides the necessary section modulus as well as shear rigidity at a low weight premium and the facing provide the adequate flexural rigidity and strength. Such a combination is being referred to as sandwich effect. The application of sandwich panels is of recent origin and their heterogeneous nature makes the understanding of static behavior extremely complex.In this study attempts have been made to study the effect of change thickness of Fiber reinforced Polymer (FRP) facing sheets and inserts. The total thickness of the sandwich panels is kept constant to 20 mm. three point and four point tests are conducted in digital flexural testing machine according to ASTM standards. The span length during testing have been varied that is 200 mm and 400 mm. the results have been analyzed to conclude which combination of panel containing varied thickness of face sheets and inserts give best stiffness values.

Effect of stainless-steel wire mesh embedded into fibre-reinforced polymer facings on flexural characteristics of sandwich structures

“…The skin thickness effect was investigated by Kumar and Soragaon. 69 There were two different configurations, the first one was 1 mm glass fibre skins with 16 mm PU core and the other was 2 mm glass fibre skins with 18 mm PU core. Increasing skin thickness with similar core material resulted in two times higher bending stiffness.…”

Structural Performance of Polyurethane Foam-Filled Building Composite Panels: A State-Of-The-Art

“…They estimated that the threshold loading levels at infinite fatigue life were 23% and 37% of ultimate monotonic strength for the cases of fully reversed loading and fully unloaded conditions, respectively. Kumar et al [37] also studied the effect of change of thickness of fibre-reinforced polymer (FRP) facing sheets and inserts on the composite panels bending behaviour. They kept the total thickness of composite panels constant, while the span length was varying to find which combination of the panel, containing varied thickness of face sheets and inserts, could provide the best static flexural values.…”

Flexural and shear performance of an innovative foam-filled sandwich panel with 3-D high density polyethylene skins

“…Wang et al (2014) focused on the bending behaviour of an innovative sandwich panels with GFRP face sheets and a foam-web core (GFFW) panels, where t]heir experimental study demonstrated that the ultimate bending strength and initial bending stiffness can be significantly enhanced by increasing web thickness. Kumar and Soragaon (2014) studied on the effect of change thickness of fibre reinforced polymer (FRP) facing sheets and inserts on the flexural behaviour of sandwich panels with a constant total thickness. Tuwar et al (2015) evaluated three different polyurethane foam configurations for (GFRP) foam-core sandwich panels.…”