Composite and Damping Materials Characterization with an Application to a Car Door
This paper presents the characterization of a Carbon Fibre Reinforced Plastic (CFRP) and a couple of damping materials, particularly suited to the manufacturing process of composites. Young’s modulus and loss factor of each material are defined by means of the Oberst beam test method, where a specific curve fitting technique replaces the half-power bandwidth procedure to ameliorate the estimates of the parameters. Effects of both temperature and aging are reported, since operational conditions are various and time duration very important for most components, for sure in the automotive sector. Two sandwich beams, formed by the sequence CFRP/damping material/CFRP, are also tested to experimentally verify the effectiveness of this configuration to provide damping. Finally, two complete car doors have been produced with a CFRP composite, with and without an intermediate damping layer. Their modal parameters have been extracted by an experimental modal analysis and show that the damping material can effectively ameliorate the noise and vibration response of the structure.
KeywordsDamping materials Automotive Oberst test FEM NVH FRF CFRP
The authors wish to acknowledge: Gummiwerk KRAIBURG GmbH for the damping material “KRAIBON® SUT9609/24 and HHZ 9574” and the active support during all the activity and G. Angeloni® S.R.L. for the structural CFRP material.
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