Sandwich-structured composite

About: Sandwich-structured composite is a research topic. Over the lifetime, 5853 publications have been published within this topic receiving 101126 citations.

Buckling, collapse and failure analysis of FRP sandwich panels ☆

Abstract: Rectangular orthotropic fiber-reinforced plastic (FRP) sandwich panels were tested for buckling in uni-axial compression The panels, with 032 cm (0125 in) face sheets and a 127 cm (05 in) core of either balsa or linear poly(vinyl chloride) (PVC) foam, were tested in two sizes: 154×77 cm2 (72×36 in2) and 102×77 cm2 (48×36 in2) The sandwich panels were fabricated using the vacuum-assisted resin transfer molding process The two short edges of the sandwich panels were clamped, while the two long edges were simply supported for testing The clamped panel ends were potted into a steel frame The experimental elastic buckling loads were then measured using strain gauges fixed to both sides of the panels A total of 12 panels were tested under uni-axial compression Bifurcation in the load versus engineering strain curve was noted in all cases For all six sandwich panels tested using balsa core, the type of failure was easily identified as face sheet delamination followed by core shear failure For all six PVC foam core sandwich panels tested, the type of failure consisted of core shear failure with little or no face sheet delamination In the failed balsa core panels there was little or no evidence of balsa remaining on the FRP face sheet, however, in the PVC foam core panels there were ample amounts of foam left on the FRP face sheet It was concluded that although the buckling loads for the foam core panels were not as high as those for the balsa core panels, PVC foam core bonding to the FRP face sheets was superior to balsa core bonding

Failure modes and influence of the quasi-static deformation rate on the mechanical behavior of sandwich panels with aluminum foam cores

Abstract: The main purpose of this work is to study the bending behavior and deformation mechanisms of sandwich panels with AlSi7-alloy foam cores obtained by the powder metallurgy method. For this purpose, quasi-static three-point bending tests were performed on samples of AlSi7-alloy foam sandwich panels at different cross-head displacement rates: 1, 10, 20, 40 and 80 [mm/min]. Load-deflection values were registered during the bending test and further transformed into bending moment–rotation data. Obtained results show that different failure collapse modes can be obtained for samples with identical nominal dimensions, depending on the cross-head displacement rate.

An equivalent plate model for corrugated-core sandwich panels †

Abstract: This paper suggests an equivalent plate model to analyze the mechanical behavior of corrugated-core sandwich panels under tensile and bending loads. A homogenization-based theory based on the equivalent energy method is used to obtain the stiffness matrices of corrugated cores of a sandwich panel. Equivalent continuum layers with orthotropic elastic constants corresponding to the membrane and bending stiffness terms of the corrugated layers are determined by using classical lamination theory (CLT). The importance of this work is that an equivalent plate model for corrugated-core sandwich panels can be easily obtained by combining the equivalent energy method and the CLT. The proposed equivalent model is verified by numerical simulations of sandwich panels with sinusoidal and trapezoidal corrugated cores.