Fatigue Crack Growth Life Assessment for Industrial Applications using Re-meshing and Bayesian Hybrid Techniques

摘要

In this study, two different techniques are outlined for assessment of fatigue crack growth life of industrial components: i) a finite element based approach (3DFAS, GE proprietary) using re-meshing techniques that allows automatic propagation of cracks under realistic loading conditions and ii) novel approach using Bayesian hybrid methods (BHM) that significantly improves the efficiency of life assessment computation of the former approach. Parallel processing of a set of three dimensional crack geometries using 3DFAS and Ansys is used to create a crack propagation space that is further used to build metamodels required to assess propagation life for an asymmetrically grown planar crack. Verification of the 3DFAS-BHM procedure against automatic (serial mode) finite element crack propagation simulation (using 3DFAS) is provided.