Un modello per la stima della vita a fatica a modo misto di giunzioni incollate in materiale composito

In this paper a first step towards the definition of a unifying model based on the process-zone concept has been attempted. Aim of the proposed model is to summarize the fatigue behaviour of composite bonded joints under mixed-mode (I+II) fatigue loading conditions focusing as close as possible on the actual damage mechanisms observed during the fatigue tests, which were found strongly dependent on the mode mixity. The proposed model has been verified on the experimental results obtained from DCB, ENF and MMB tests as well as on single lap bonded joints. Finally the model is successfully applied to the description of joint behaviour under static mixed-mode loading.