Study On The Interlaminar And Properties Of Sandwich Composite Panels Reinforced By Woven Spacer Fabric

In this paper, high-strength low-stretch polyester industrial filament was used in woven spacer fabric. New type sandwich composite panel was developed by filling foam materials between the fabric space and composite resin to surface layer of the spacer fabric. Then the theoretical analysis and experimental research about the mechanical properties of the new panels were proceeding.Design and manufacture the woven spacer fabric-class about different face-sheet weave. Then the woven spacer fabrics were used to process composite panels. Polyurethane foam was chosen as the fill material and epoxy resin was chosen as the matrix resin. The two kinds of processing craft, fill-first and composite-first were investigated. Fill-first was chosen as the subsequent processing craft through contrastive analysis about the processing and various mechanical and physical properties of the panels made by the different process.The interlayer performance of the composite panels was studied and the failure modes of materials of shear and peel were ascertained. The effects of physical and mechanical properties between different woven fabric structures were discussed. The results show that when the shear forced effect on the composite plates will product two peak. The first peak was produced by the separation of foam and panel and the second peak was produced by binding warp fracture. The greater the binding yarn density, the larger the plate shear strength. Lower panel structure density has a beneficial effect on the first peak of shear strength, but it will produce adverse effect on the shear strength of the second peak. With the increase of the binding yarn density, the peel force will also increase. Panel structure density increase makes the composite plate peeling performance improved. The biggest peel force decrease with the binding yarn height increase.The low-velocity impact property and the remaining side compressive strength after low-velocity impact of the woven spacer fabric composite panel were studied. The results showed that, the different height of binding yarn composite panels had different damage mode at the same impact energy acting. Buckling low-height panels and the impact destroy on face-sheet and core occurred on high-panels. Under the same impact energy the damage of composite panels with basket weave face-sheet structure was usually small and the damage of composite panels with plain weave face-sheet structure is most obvious. With the impact energy increasing, the remaining side compressive strength reduced. The reduction of the side compressive strength on composite panels with plain weave face-sheet is the smallest among the four different panels, while the reduction of the side compressive strength on composite panels with basket weave face-sheet is the biggest.