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Identification of honeycomb sandwich properties by high-resolution modal analysis

Abstract : A method is proposed to identify the mechanical properties of the skin and core materials of honeycomb sandwich. All the elastic coefficients and loss-factors that matter in the dynamics of a panel in the thick-plate approximation are identified. To this end, experimental natural modes (i.e. eigenmodes of the damped system) are compared to the numerical modes of a large sandwich panel (lx,y/h ≃ 80). The chosen generic model for the visco-elastic behaviour of the materials is E(1 + jd). The numerical modes are computed by means of a Rayleigh-Ritz procedure and their dampings are predicted according to the visco-elastic model. The frequencies and dampings of the natural modes of the panel are estimated experimentally by means of a high-resolution modal analysis technique. An optimisation procedure yields the desired coefficients. A sensitivity analysis assess the reliability of the method.
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Contributor : Marc Rébillat <>
Submitted on : Tuesday, September 6, 2011 - 11:01:49 AM
Last modification on : Monday, February 10, 2020 - 6:14:03 PM
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  • HAL Id : hal-00619345, version 1

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Marc Rébillat, Xavier Boutillon. Identification of honeycomb sandwich properties by high-resolution modal analysis. 14th International Conference on Experimental Mechanics, Jul 2010, Poitiers, France. pp.452. ⟨hal-00619345⟩

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