Composite materials have been the most significant revolution in structural mechanics since 1960. There is a general lack of data on the long-term performance of these materials. The objective of this thesis is to develop a methodology, based on mechanistic models, for predicting the long-term durability of fiber reinforced polymer (FRP) composite materials. Accelerated testing simulating the composites applications in various constructions and fields has been used to validate it. The research developed a basic predictive tool using the Arrhenius principles adapted to the TTS...