Abstract
Tooth-plate-glass-fiber hybrid sandwich (TFS) is a type of sandwich composites fabricated by vacuum-assisted resin infusion process, in which glass fiber facesheets reinforced by metal plate are connected to foam core through tooth nails. Bending properties and interlaminar properties of TFS beams with various foam densities were investigated by flexural tests and DCB (double cantilever beam) tests. The test results showed that by increasing the foam core density from 35 kg/m3 to 150 kg/m3, the peak strength of TFS beams significantly increased by 168% to 258% compared with similar sandwich beams with fibrous composite facesheets. With the change of foam density and span length, the main failure modes are core shear and facesheet indentation beneath the loading roller. The interlaminar strain energy release rates of TFS specimens also increased by increasing the density of the foam. In addition, an analytical model was used to predict the ultimate bending strength of TFS beams, which were in good accordance with the experimental results.
Highlights
A composite sandwich structure consists of facesheets and core and has been widely used in structural engineering, marine, and transportation industry [1]. e fiber-reinforced plastics (FRP) or metallic layers are usually used as skin materials
FMLs were made of aluminum 1050 and unidirectional glassepoxy. e test results showed that scaling has no effect on general tensile behaviors of FMLs. e failure modes of FMLs were fiber breakage, delamination between composite layers, debonding between metal and composite layers, and aluminum fracture in tensile tests. ey found that fiber metal laminates obey scaling law under three-point bending load and the main failure mode was debonding between metal and composite layers
The following conclusions can be obtained through the above research: (1) For common composite sandwich structure, there were many kinds of failure modes, like indentation, core shear, facesheet debonding, and kinking, under bending load
Summary
A composite sandwich structure consists of facesheets and core and has been widely used in structural engineering, marine, and transportation industry [1]. e fiber-reinforced plastics (FRP) or metallic layers are usually used as skin materials. Steeves and Fleck [7] investigated collapse mechanisms of sandwich beams with composite faces and a foam core under three-point bending load. E test results showed that the use of fiber metal laminates as the skin material can improve the impact behavior, damage resistance, and damage tolerance of sandwich structures. E test results showed that these materials offer excellent resistance to dynamic load and the incident energy was absorbed through plastic deformation in the aluminum layers and localized microcracking within the composite plies. Tooth plate was connected with foam core through tooth nails, which is different from FML facesheets, in which the metal plate and the glass fiber-reinforced composite were bonded together. Ree-point bending test and DCB (double cantilever beam) test were carried out to obtain the load-displacement curves, failure modes, bending properties, and interlaminar behavior of the sandwich structures. An analysis model was proposed to predict the peak load of the TFS
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