Experimental methodology to assess the dynamic equivalent stiffness properties of elliptical orthotropic plates

This paper deals with the dynamic characterisation of plate structures elliptical orthotropic stiffness properties, using an equivalent thin theory a wave fitting approach. The method consists in projecting experimentally determined transverse displacement field on analytical Green’s function based Hankel’s functions. error between projected and measured fields is then minimized, varying characteristics until optimal fit reached. thus obtained are two flexural rigidities defining orthotropy plate, angle. procedure applied at each frequency, enabling determination frequency dependent material properties. to honeycomb sandwich panel validate proposed identified compared estimations by means model IWC (Inhomogeneous Wave Correlation) assuming three different type (anisotropic, orthotropic). For assumption, consistent results observed methods over large range (from 1 50 kHz).