A fatigue life prediction method for impacted laminates

摘要

The existing models are established based on fatigue behavior of impacted laminates. It makes them unsuitable for general use. In this research, a general 3-D progressive damage fatigue life prediction method for impacted laminates is developed based on progressive damage theory and fatigue behavior of unimpacted unidirectional plies. This model can predict fatigue life of laminated composites -with different ply parameters, geometry, impact damage, and fatigue loading conditions. For avoiding impact test in order to get impact damage information, a whole damage process analysis method of laminated composites under the impact loading and fatigue loading is analyzed. The predicted damage statuses of composite laminates apply to analyze post-impact fatigue life. A parametric modeling program was developed to predict the impact damage process and fatigue life of impacted laminates base on the whole damage process analysis method. The most relative error between predicted results and test results is 7.78%.)