Numerical analysis of stress intensity factor and T-stress in pipeline of steel P264GH submitted to loading conditions
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Équipe Science et Ingénierie des Matériaux (ESIM), Département de Physique, Université My Ismaïl, Errachidia
ENSTA Bretagne, LBMS/DFMS, Brest Cedex
LaBPS, Université Paul Verlaine Metz,Ecole Nationale d'Ingénieurs de Metz, Metz
TPCIM, Ecole des Mines de Douai, Douai Cedex
Karpenko Physico-Mechanical Institute of National Academy of Sciences of Ukraine, Lviv
Journal of Theoretical and Applied Mechanics 2015;53(3):665–672
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.