Possibilities of the Additional Damping of Unidirectional Fiber Composites by Implementation of Viscoelastic Neoprene and Rubber Layers

Abstract

The aim of the presented work is to assess modal, transmission, and damping characteristics of layered carbon plates. The base is to carry experimental analysis verified by FEM model, which evaluates the vibration transfer of tested composites and describes possibilities of additional damping by implementation of viscoelastic layers. Preimpregnated carbon fibers known as prepreg were used for creation of the samples composed of four (2 constant and 2 variable) layers. The task was to assess impact of changing the fiber orientation on the transfer function and individual modal characteristics. As another option, testing of some additional damping materials was included. Neoprene and thin rubber coat were added as an outside damping element when the neoprene ply was inserted also among the layers. Expected dependence of the plies orientation onto the shape of the transfer function and even swapping of some of MOD characters (bending, torsion, and their combinations) have been found. The use of the additional damping materials is also possible but the right combination of the individual plies layout and stacking sequence is the most significant part. The results had been statistically analyzed and showed that the created layered shell FE models could be used to describe the behavior.

Testing Device for Biaxial Loading of Textile Specimens

“…However, since 2011, there has been a great deal of development in the field of tested textile structures and the parameters of the equipment have ceased to meet the needs of the tests. For some textile structures, the required test force is many times greater than the 500N maximum of the test device or the tests must be performed under non-standard conditions [3]. Changes in sample structure during loading are mostly monitored by the camera.…”

Theoretical and Experimental Studies on Vibration Resistance of Composite Plates with Damping Coating

“…Moreover, they established a FE model by LS-DYNA to quantify the energy absorption performance of such a damping coating with different configurations. By using a FE plate model, Kulhavy et al [18] evaluated the additional damping behaviours of fiber-reinforced plates coated with viscoelastic neoprene and thin rubber material. They also performed experimental tests to validate the FE model as well as to find the nonlinear damping phenomenon.…”