Fiber break model for tension-tension fatigue of unidirectional composites

Damage progression in unidirectional (UD) composites tension-tension fatigue is vital to understanding more complex laminates and loading conditions. We therefore developed the UD model that considers fiber breaks, fiber-matrix debond growth, as well interactions of these damage modes. The contribution each mode assessed those dominate are identified. accounts for Weibull statistics strength stress redistribution around breaks. predictions indicate a significantly higher density breaks clusters compared quasi-static at same level. predicts S–N curves pure uniaxial does not consider concentrations caused near grips; tend overpredict life experimental available literature. has potential be different