Analytical model of the dynamic behaviour of CFRP plates subjected to low-velocity impacts

In the light of an increment of the safety of CFRP components and systems subjected to low-velocity impacts, the identification of a damage onset threshold is desired. Hence the suitability of an analytical model for the estimation of the critical load of delamination onset, as well as, an approximation of the load-displacement curve, has been investigated. Starting from the Olsson's analytical model, available in the literature, a new model has been developed for the prediction of the mechanical behaviour of composite laminates subjected to low-velocity impacts, following a dynamic approach and taking into account stiffness degradation. The performances of the new model have been compared with results of an experimental impact testing program, showing good agreement with the data and significant improvements when compared with the Olsson's model.