Houda Salmi - National Higher School of Mechanics, ENSEM, Laboratory of Control and Mechanical Characterization of Materials and Structures, Casablanca, Morocco
Khalid El Had - Institute of Maritims Studies, Laboratory of Materials and Structures, Casablanca, Morocco
Hanan El Bhilat - National Higher School of Mechanics, ENSEM, Laboratory of Control and Mechanical Characterization of Materials and Structures, Casablanca, Morocco
Abdelilah Hachim - Institute of Maritims Studies, Laboratory of Materials and Structures, Casablanca, Morocco

The present work investigates the effect of the elliptical three-dimensional (3D) cracks on a pipe with thickness transition, considering internal pressure. Level sets were defined using the extended finite element method (XFEM), the stress intensity factors (SIFs) of 3D cracks were investigated and compared between straight pipes and pipes with thickness transition. The results show that the XFEM is an effective tool for modeling crack in pipes. A pressurized pipe with thickness transition is more sensitive to the feature compared to the straight pipe. Parameters of the transition zone have an influence on stress intensity factors. Quantification of the SIFs associated with cracks in the transition zone of pipes with thicknesses is performed.

Pressurized equipment, Pipe with thickness transition, Three-dimensional crack, XFEM, SIF, Level set