Abstract
Abstract In this study, the foam sandwich panels were manufactured by integrating top facesheet and bottom facesheet with pyramidal lattice stitched core to overcome the weak interface between the core and skins of the sandwich structures. Low-velocity impact test and numerical simulation were conducted to reveal the failure mechanisms and energy absorption capacity at sandwich composite with foam core, different strut stitched foam core under different impact energy. The experimental results show showed that the strut core can improve the impact resistance of the specimen, and which is closely related to the diameter of the strut core. Compared with foam sandwich structure, pyramidal lattice stitched foam sandwich composites have comparable specific energy absorptions. The failure modes were also analyzed which is: fiber breakage, delamination, foam deformation and strut core breakage. The research presented here confirms that numerical simulation show good agreement with the experiment.
Highlights
Composite sandwich structures have been attracted considerable critical attention in aerospace and automobile industries due to the benefit of high strength construction with light weight [1,2,3]
In this study, the foam sandwich panels were manufactured by integrating top facesheet and bottom facesheet with pyramidal lattice stitched core to overcome the weak interface between the core and skins of the sandwich structures
The experimental results show showed that the strut core can improve the impact resistance of the specimen, and which is closely related to the diameter of the strut core
Summary
Composite sandwich structures have been attracted considerable critical attention in aerospace and automobile industries due to the benefit of high strength construction with light weight [1,2,3]. Due to the broad prospects of the foam lattice sandwich structure , there has been a series of methods proposed by the researchers for manufacturing specimens, such as hot press molding, weaving and sheet folding [12,13,14]. [16], hot press molding was used to manufacture composite sandwich beams with lattice core. The author put the top and bottom facesheets and strut cores which were made up of carbon fiber prepreg into the rigid mold and the sample was vacuum bagged and cured in an autoclave. Wang et al [17, 18] manufactured foam sandwich structures which were reinforced by carbon fiber columns
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