Local specific bending stiffness identification of an unhomogeneous composite plate via high-resolution wavevector analysis

An original Non Destructive Evaluation procedure is presented. It allows the in-situ identification of the local elastic behavior of a composite plate, with a little sensitivity to boundary conditions and loads. The harmonic response of a of a composite plate is approximated as a combination of plane waves. By the application of a high resolution wavevector analysis tool (HRWA), the wavevectors of these waves can be extracted. While theoretical wavevectors can be derived from plate's local equations of motions, an inverse identification problem can be formulated. Here, the Classical Lamination Plate Theory is used in order to identify the local specific bending stiffness of a composite CFRP plate with spatially varying fiber orientations. Experimentally identified plate properties are in good agreement with the predictions computed from material properties.