Experimental and Theoretical Study of Sandwich Panels with Steel Facesheets and GFRP Core

Abstract

This study presented a new form of composite sandwich panels, with steel plates as facesheets and bonded glass fiber-reinforced polymer (GFRP) pultruded hollow square tubes as core. In this novel panel, GFRP and steel were optimally combined to obtain high bending stiffness, strength, and good ductility. Four-point bending test was implemented to analyze the distribution of the stress, strain, mid-span deflection, and the ultimate failure mode. A section transformation method was used to evaluate the stress and the mid-span deflection of the sandwich panels. The theoretical values, experimental results, and FEM simulation values are compared and appeared to be in good agreement. The influence of thickness of steel facesheet on mid-span deflection and stress was simulated. The results showed that the mid-span deflection and stress decreased and the decent speed was getting smaller as the thickness of steel facesheet increases. A most effective thickness of steel facesheet was advised.

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

“…Figure 6(a) presents the loadmidspan de ection curves of the lattice-web reinforced foam core sandwich panels with di erent web heights; the bending OS represents ordinary sandwich panels (PU core) without lattice-web reinforcements, and the following number (e.g., 50, 75, and 100) represents the height of the core. 2 TS represents lattice-web reinforced sandwich panels; the rst number (e.g., 75, 125, and 175) represents the spacing between the lattice webs, and the following number (e.g., 50, 75, and 100) represents the web height. sti ness is calculated according to the slope of the loadde ection curve.…”

“…Composite sandwich structures have been widely employed in aviation, military, transport, and civil applications as a result of their unique characteristics, including their high strength, high stiffness-to-weight ratio, structural designability, and excellent corrosion resistance [1][2][3]. Lowdensity materials such as foam, honeycomb cells, and balsa wood are usually adopted as the core of composite sandwich structures, thereby contributing to a high stiffness along the face sheets to resist loadings.…”

Numerical Research on the Pullout Failure of GFRP Bolt

“…163 explicit structural shell units were selected as the calculating nits, and they supported all nonlinear characteristics in the explicit dynamics numerical analysis [29,30]. In addition, the fastest BelytschkoTsay algorithm was applied [31].…”

An extended cohesive damage model study of geometrical ratio effects on failure mechanisms of functionally graded sandwiches with multi-layered cores

“…Failure mechanisms of composite sandwich panels with metal foam with varied densities were studied by [26] and found shear failure of foam core as major failure but this investigation was merely focused on a sample with one density and varied number of plies in faces. Likewise, impact of increasing thickness of faces has been studied by [27] and found improved stiffness, flexural rigidity and ultimate load. However, the effect of depth-span ratio of functionally graded sandwiches with multi-layered cores (FGSMLC) in which material properties are varied layer by layer in core were much less investigated in the past.…”