Identification and monitoring of the material properties of a complex shaped part using a FEMU-3DVF method : application to wooden rhombicuboctahedron
Résumé
In this study, a non-destructive method, FEMU-3DVF, based on velocity fields measurements and finite element model
updating is used to identify the material properties of a complex shaped wooden part. The part studied is a rhombicuboctahedron
made of spruce wood. Its dynamical response is measured with a laser-3D vibrometer and the experimental modal basis is used
to identify the material properties of the spruce wood. Considering the experimental modes, the shear modulus in the RT plane
of spruce (GRT), as well as the corresponding loss factor (ηRT) can be reliably measured. The part undergoes three different
relative humidity cases which lead to three moisture content levels for which the material properties are identified. It is shown
that GRT decreases and (ηRT) increases when the moisture content increases. This method can be used to monitor complex
shaped structures in a non-destructive, contact-free, way; and is representative of a global behavior of the structure.