Multi layer coating technology can be an effective tool to design composite materials with specifically designed damping behavior and some applications are recently known in the aerospace and in the automotive industry. Dynamic mechanical measurements were made on thin-walled components, in the form of multi layered beam specimen, to investigate the composite dissipative properties. Conventional beam theories, can be unsuitable to accurately describe the complex damping behavior of multi layered beams and cannot take into account of contributions such as the frictional actions and slipping at the interface between layers. In this work, multi layered composite beams are modelled, by means of a modified, third order, zig zag model where the contribution of the stiffness of the coating layer materials and of the hysteretic actions at the layer interfaces is taken into account. Third order polynomial functions are adopted to describe the longitudinal displacement of the beam and the continuity of the shear stress across the multi layered beam depth is enforced. The number of kinematic variables used to define the beam motion may depend on the number of layers of the beam, and on the imposed kinematic and dynamic continuity conditions. Such a model is used to get optimal coating solutions with specific dissipative properties at the modelling stage. Some applications are presented and results are discussed.
Multi layer composite coating technology for high damping mechanical structural applications
Amadori S.
;Catania G.
2017
Abstract
Multi layer coating technology can be an effective tool to design composite materials with specifically designed damping behavior and some applications are recently known in the aerospace and in the automotive industry. Dynamic mechanical measurements were made on thin-walled components, in the form of multi layered beam specimen, to investigate the composite dissipative properties. Conventional beam theories, can be unsuitable to accurately describe the complex damping behavior of multi layered beams and cannot take into account of contributions such as the frictional actions and slipping at the interface between layers. In this work, multi layered composite beams are modelled, by means of a modified, third order, zig zag model where the contribution of the stiffness of the coating layer materials and of the hysteretic actions at the layer interfaces is taken into account. Third order polynomial functions are adopted to describe the longitudinal displacement of the beam and the continuity of the shear stress across the multi layered beam depth is enforced. The number of kinematic variables used to define the beam motion may depend on the number of layers of the beam, and on the imposed kinematic and dynamic continuity conditions. Such a model is used to get optimal coating solutions with specific dissipative properties at the modelling stage. Some applications are presented and results are discussed.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
