Three-Dimensional T-Stress to Predict the Directional Stability of Crack Propagation in a Pipeline with External Surface Crack

Abstract:

In industrial structures, the presence of cracks under critical loads leads to complete ruin. Fracture rupture mechanics allowed studying macroscopic defect harmfulness. This requires the knowledge of the stresses fields and the deformations near of the crack. Our work is an application of fracture mechanics into the domain of the pressurised structures with defects in the presence of the T-stress parameter. Design of this type of structures is subjected to standards, codes and regulations driven by the potential risk which they represent. The knowledge of the limit pressures in these structures allows appreciating the safety domain of. We present numerical solutions by the commercial code CASTEM2000 in three dimensional 3D and experimental results for the stress intensity factor SIF and the transverse stress noted T-stress, distribution at defect-tip in a Pipeline. The elastic structure modelling will be treated by the finites elements simulation. We study the influence of the geometrical parameters for surface notches and the measures of strains near defects in the studied model have been made by strain gauges. On the basis of the detailed 3D elastic FE analysis results, solutions presented are believed to be the most accurate, and thus provide valuable information for structural integrity assessment considering a notch-tip constraint. The experimental results validate allow numerical simulation. Keywords: Crack, Pressure, T-stress, Stress Intensity factor, Finite element simulation, Strain gauges,

• Periodical: Key Engineering Materials (Volume 498)
• Pages: 31-41
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.498.31
• Online since: January 2012
• Authors: H. Moustabchir, Z. Azari, S. Hariri, I. Dmytrakh
• Keywords: Crack, Finite Element (FE) Simulation, Pressure, Strain Gauges, Stress Intensity Factor (SIF), T-Stress

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