Abstract
Abstract : Hardware representative of viscoelastic damping material in a cavity in a spinning jet engine blade was investigated. Specimens representing jet engine fan blades were analyzed, designed, fabricated and spun to establish that elastomer filled cavities can be designed for service in high-g environments. It was also shown that such systems can be analyzed using conventional finite element analysis. Spin rates of 7500 RPM were achieved which at a radius of 14 inches resulted in a g-level of 22,400 in the outer edge of a constrained viscoelastic material (VEM) damping treatment. Static strain readings were taken for the cavity walls. Dynamic testing was conducted and some excitation and response vibration data was acquired during spin. The elastic constants and elastomeric properties such as shear modulus, youngs modulus, bulk modulus, and Poisson's ratio of the VEM were also experimentally investigated in the laboratory. Initial results from these investigations are reported upon here.
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