NUMERICAL MODELING OF IMPACT DAMAGE

A method is described for predicting barely visible impact damage in r ealistic composite structures. It avoids a three-dimensional finite el ement analysis by 'embedding' coupon tests as a calibrator in the fini te element model of the larger actual structure. Predictions are then made for all the dynamic responses including force and strain historie s. A theoretical method is devised for predicting threshold fracture l oads. This strategy is successfully validated by tests for carbon comp osite structures, and then extended to glass and Kevlar laminated plat es with varying degrees of success.