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Fatigue in composite shells of flextensional transducers can be investigated experimentally but in service results transposition is uncertain. This study can also be carried out numerically. However, a simple model rarely allows to describe the fracture in fatigue of an existing structure. The approach that is suggested here aims (starting from a modal analysis of a damaged structure in situ and according to results of a numerical computation by finite elements) at identifying the type of flaw in a qualitative and quantitative way. This paper first presents the finite element used to deal with this problem. Second the approach is validated on a shell example. Finally an experiment on a simple G.R.P. plate is used to compare numerical and experimental results to validate the approach

Numerical study of defects in glass reinforced composite transducer shells