Eventos Anais de eventos
COBEM 2017
24th ABCM International Congress of Mechanical Engineering
THE USE OF XFEM FOR STRESS INTENSITY FACTOR ESTIMATION OF SURFACE CRACKS
Submission Author:
Gabriel de Castro Coêlho , PB , Brazil
Co-Authors:
Antonio Almeida Silva, Marco Antonio dos Santos, Gabriel de Castro Coêlho
Presenter: Gabriel de Castro Coêlho
doi://10.26678/ABCM.COBEM2017.COB17-0534
Abstract
The eXtended Finite Element Method (XFEM) is a numerical technique based on the Partition of the Unity Finite Element Method (PUFEM) that has overcome difficulties in the modelling of structures containing strong discontinuities, such as cracks, in comparison to the conventional Finite Element Method (FEM). The practical use of the XFEM for structural integrity assessment was evaluated in comparison with the conventional FEM for the extraction of the Stress Intensity Factor (SIF) of common engineering structures with surface semi elliptical cracks. The structures here considered were a plate and a hollow cylinder. Two types of model were considered for the hollow cylinder case: surface-based tie constraint model and complete model. Two types of mesh structuring technique around crack location were also considered both for the plate and hollow cylinder. Both FEM and XFEM models results were compared with common analytical solutions. Results indicate that the XFEM can be used as a reliable technique for SIF estimation, but attention should be taken specially to the mesh structure around crack location, which proved to be crucial to the agreement of the SIF profile obtained by this numerical technique to the analytical solution and FEM results.
Keywords
extended finite element method, Stress Intensity Factor, surface semi elliptical crack, plate, hollow cylinder
