Identification of local complex Young's Modulus of beam by using an inverse method and a finite element operator

摘要

Fabrication of composite materials causes a challenge to identify correctly the elastic and damping properties of those materials, which can have complex shapes. Recently a new approach derived from the Force Analysis Technique (FAT), was developed to characterize structural parameters from local equation of motion. This method worked well for structures with known analytical models. The purpose of this work is to present a similar approach where known analytical models are replaced by a Finite Element (FE) operator. In this paper, the FE model is used to identify complex Young's Modulus from a measured displacement field. To compensate the noise introduced by the measurement, a procedure based on a probabilistic approach, is proposed. The method also allows to identify local stiffness and structural damping on a beam using simulated displacement. Finally, this identification is shown from measured displacement field.