Extension of the resonant beam technique to highly anisotropic materials

The resonant beam technique is a simple and effective method to measure the elastic moduli of rectangular or cylindrical isotropic beams. This paper proposes an extension of this method to highly anisotropic materials with orthotropic or higher symmetry via measurement of one or more samples, which are cut out of the material in different directions. The method is validated with computer simulated samples and measured unidirectionally carbon fibre reinforced carbon samples.