This paper presents a study about the influence of through-thickness tufted fibres on compression and bending properties of sandwich structures. The tufting process aims to avoid the delamination between the skin and core in order to improve the performance of sandwich structures, increase the interlaminar strength and damage tolerance of sandwich structures.
To evaluate the effect of tufting in sandwich structures, an experimental study was developed which included edgewise compression and 3-P bending tests of tufted and nontufted sandwich panels made of carbon/epoxy and E-glass/epoxy face sheets, PVC and PUR foam cores and E-glass and aramid through-thickness fibres with different tufting densities.Conclusions about the efficiency of the insertion of through-thickness fibres on compression and bending properties are drawn.
Sandwich structures are highly demanded where a high flexural stiffness per weight ratio is needed. The main limiting factor of these materials is the core/skin interface, which tends to delaminate. Tufting is one of the most promising technologies to reinforce this interface along the z-direction. In this article, the energy absorption of tufted sandwich structures under impact loads is evaluated. Six different types of tufted specimens were tested, including both carbon and glass fiber faces with three different tufting densities. The impact behavior of a sandwich panel is proved to be effectively improved by the tufting process.
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