ARTICLE
Numerical analysis of stress intensity factor and T-stress in pipeline of steel P264GH submitted to loading conditions
1 1 | Équipe Science et Ingénierie des Matériaux (ESIM), Département de Physique, Université My Ismaïl, Errachidia |
2 | ENSTA Bretagne, LBMS/DFMS, Brest Cedex |
3 | LaBPS, Université Paul Verlaine Metz,Ecole Nationale d'Ingénieurs de Metz, Metz |
4 | TPCIM, Ecole des Mines de Douai, Douai Cedex |
5 | Karpenko Physico-Mechanical Institute of National Academy of Sciences of Ukraine, Lviv |
Journal of Theoretical and Applied Mechanics 2015;53(3):665–672
KEYWORDS
T-stressStress Intensity Factor (SIF)finite element method (FEM)Stress Difference Method (SDM)volumetric method
ABSTRACT
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.
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