Prediction of long-term fatigue life of CFRP composite hydrogen storage vessel based on micromechanics of failure

A life prediction method for the CFRP composite hydrogen storage vessel under cyclic fatigue loading and high temperature conditions was proposed based on the integration of micromechanics of failure (MMF) and time-temperature superposition principle (TTSP) method. As a first step, the elastic solution of the cylindrical laminates subjected to internal pressure is obtained based on the classical laminate theory. Then, the MMF is used to calculate the constituent strength from ply strength at various temperatures, and the matrix fatigue master curves are constructed accordingly by using TTSP. Finally, a life prediction procedure using the constituent master curves is described and applied in the MATLAB software to predict the long-term fatigue life of the composite vessel. The reliability of MMF based methodology is also discussed by comparing the predicted results with the experimental ones.