Abstract
Service failures of gas turbine blade configurations, dynamic structures and systems have been attributed to propagation of resonant stresses triggered by structural vibration or noise. One way to minimise or reduce the transmission of such phenomena is to exploit the mechanism of interfacial slip in press fit joints or layered structural laminates to dissipate the attendant vibration energy. Recent results from analytical investigation for two layered sandwich elastic beams have shown that when such laminates are subjected to static or dynamic loading, non-uniformity in interface pressure can have significant effect on the vibration characteristics, energy dissipation and damping properties. In this paper, a generalised theory for slip damping with multilayered structural elastic laminates with non-uniform interface pressure framed as a boundary value partial differential equation is presented. As a simple demonstration and validation of the theory, closed form expressions for the natural frequency and dynamic response with homogeneous multilayered cantilever architecture are reported. In addition, earlier results for two layered sandwich elastic beams are recovered as a special case. In particular, the efficacy of multilayered sandwich laminates for vibration energy dissipation and logarithmic damping decrement associated with such layered sandwich structures are highlighted for analysis and applications.
Published Version
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