Journal of Theoretical
and Applied Mechanics

53, 3, pp. 665-672, Warsaw 2015
DOI: 10.15632/jtam-pl.53.3.665

Numerical analysis of stress intensity factor and T-stress in pipeline of steel P264GH submitted to loading conditions

Hassane Moustabchir, Jamal Arbaoui, Azari Zitouni, Said Hariri, Ihor Dmytrakh
Stress singularities occur at crack tips, corners and material interfaces. The stress intensity factors and T-stresses are coefficients of structural components where the active stress singular and first regular stress terms, respectively, are denoted by William's eigen function expansion series. A finite element analysis by CASTEM 2000 have been undertaken in order to determine the evolution of the T-stress and stress intensity factor terms in mode I for an arc of pipeline specimens with an external surface crack. A stress difference method described by Moustabchir et al. (2012) are adapted and, in the following step, the volumetric method is then embedded to compute the SIFs and T-stress near the crack tip. Different crack geometries combined with different length-to-thickness ratios are examined for the T-stress and stress-intensity factor. The revisited stress difference method employed here shows to be an accurate and robust scheme for evaluating the T-stress/SIFs in an arc of the pipeline.
Keywords: T-stress, Stress Intensity Factor (SIF), Finite Element Method (FEM), Stress Difference Method (SDM), volumetric method