DYNAMIC AND STATIC BEHAVIOUR OF COMPOSITE SANDWICH PLATBANDS WITH KEVLAR HONEYCOMB CORE

In this paper the authors have experimentally determined, using some known methods, the loss and damping factors, equivalent dynamic Young modulus and flexural rigidity for composite sandwich platbands with two types of kevlar honeycomb core (rectangular and hexagonal) reinforced with kevlar-carbon fiber. The experimental procedure is characterized by clamping the platbands at one end, placing an accelerometer at the free end for recording their free vibrations. The samples have a thickness of 4 mm, a length of 335 mm and 60 mm width. The connection between the kevlar-carbon fiber and kevlar honeycomb core is made by using epoxy resin with its hardener. The flexural rigidity values were validated by a static loading experimental montage: the platbands are clamped at one end and free at the other; at the free end a force has been applied and the displacement was measured with a displacement transducer. From the displacement value, the flexural rigidity was obtained. In the end, the authors have obtained that the sandwich platbands with hexagonal honeycomb core have better mechanical properties compared to the ones with rectangular honeycomb core.