MEASUREMENT OF ELASTIC PROPERTIES OF MATERIALS AND OPTIMIZATION OF FINITE ELEMENT MESHING BY VIBRATION-BASED INVERSE METHODS USING QUASI-BINARY HOLOGRAPHY

摘要

The paper presents recent research done in the Photomechanics Laboratory ofrnthe National Institute of Applied Sciences, Rouen France. in the field ofrnmaterial and structures characterization by a new vibration measurementrntechnique, the quasi-binary electronic holography, and finite element updating.rnThrough this method, elastic constants of the tested material may berndetermined with great precision, so that the mean relative error of the finiternelement model over the first 40 eigenfrequencies is less than 0.2 % while thernmaximum error is not exceeding 0.4 %.rnAn analysis of the final mean error values as a function of the maximumrnfrequency taken into account was done.. It offers data about the influence ofrnthe frequency range over which the identification is done on the elasticrnproperties values and the over-all accuracyrnAlong with material properties determination, the method allows tornoptimize different parameters used in finite element model, such as the type,rnthe size and the shape of the elements used to discretize the structure.