Extended Finite Element Methods-Based Two-Parameter Fatigue Crack Growth Prediction

Abstract

In this paper, a synthesized modeling and simulation methodology for fatigue crack growth in structural components is developed by implementing a new two-parameter crack growth model into the extended finite element method (X-FEM) combined with the level-set method. Basically, this new methodology consists of (1) X-FEM, and (2) two-parameter crack growth model. By using X-FEM, the merit of finite element methods (FEM) is retained, and the tedious and inaccurate remeshing process is avoided in the simulation and prediction of fatigue crack growth. By using the new two-parameter crack growth model, crack growth can be predicted at various stress ratios. Benchmark examples are presented to demonstrate the prediction of fatigue crack growth. As a result, an innovative next generation damage tolerance and durability design methodology and the associated fatigue crack growth simulation package are established for aerospace structures.