Abstract
This paper presents an experimental investigation of bending performance of composite sandwich panels with new mixed core, sandwich panels were tested by four-point bending test. Parametric study was conducted to investigate the influence of different core materials on the failure mode, ultimate bearing capacity, stiffness and ductility of composite sandwich panels. The results of the experimental investigation showed that the mixed core can change the failure mode of sandwich panels. The failure mode of wooden panels is characterized by tensile failure of bottom wood, and the failure mode of composite sandwich panels with wood core is that the surface layer and core are stripped and the webs are damaged by shear, while the failure mode of composite sandwich panels with wood and polyurethane foam mixed core is the shear failure of the web. Composite sandwich panels with GFRP-wood-polyurethane foam core have better bending performance and can effectively reduce the weight of panels.
Highlights
Composite sandwich panel (CSP), composed of two high-strength surface layers with a soft core, and it has been widely used in aerospace, shipping, transportation, civil engineering infrastructure and other fields because of their light weight, high strength, high stiffness, corrosion resistance and fast construction speed [1,2]
It can be concluded that the ultimate bearing capacity, initial stiffness and ductility of wood panel can be effectively improved by using glass fibre reinforced polymer (GFRP) surface layer
This paper presented the results of the four composite sandwich panels
Summary
Composite sandwich panel (CSP), composed of two high-strength surface layers with a soft core, and it has been widely used in aerospace, shipping, transportation, civil engineering infrastructure and other fields because of their light weight, high strength, high stiffness, corrosion resistance and fast construction speed [1,2]. The composite action of composite sandwich panel relies heavily on the mechanical behaviour of materials of the surface layer and core, and the composite sandwich panels made of different materials have different combination effects. It is necessary to study their bending performance, including stiffness, strength and failure mechanism. Many researchers have studied the behaviour of different types of composite sandwich panels and various equations for predicting the ultimate bending strength were proposed in the past decades [3,4,5,6,7,8]. In view of the shortcomings of the existing sandwich panels, a new composite sandwich panel with glass fibre reinforced polymer (GFRP) as the surface and web, light wood and polyurethane foam as core materials is proposed. This paper presents the results of four-point bending tests on composite sandwich panel with new mixed core. The test results in the present paper could provide a reference to the design and application of composite sandwich panel
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